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Heat Modalities Chapter 4 (still). Heat is commonly classified into 3 major categories Heat is commonly classified into 3 major categories Chemical action.

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Presentation on theme: "Heat Modalities Chapter 4 (still). Heat is commonly classified into 3 major categories Heat is commonly classified into 3 major categories Chemical action."— Presentation transcript:

1 Heat Modalities Chapter 4 (still)

2 Heat is commonly classified into 3 major categories Heat is commonly classified into 3 major categories Chemical action associated with cell metabolism Chemical action associated with cell metabolism Electrical or magnetic currents as those found in diathermy devices Electrical or magnetic currents as those found in diathermy devices Mechanical action as found with ultrasound Mechanical action as found with ultrasound The application of heat modalities is known as thermotherapy, and methods of heating are classified as being superficial or deep. The application of heat modalities is known as thermotherapy, and methods of heating are classified as being superficial or deep.

3 Superficial heating agents must be capable of increasing skin temp within a range of °F. Superficial heating agents must be capable of increasing skin temp within a range of °F. The transfer of heat to underlying tissues occurs via conduction, but superficial heating agents are limited to a depth of less than 2cm. The transfer of heat to underlying tissues occurs via conduction, but superficial heating agents are limited to a depth of less than 2cm. The use of heat is indicated in the subacute and chronic inflammatory stages of injury. The use of heat is indicated in the subacute and chronic inflammatory stages of injury.

4 Because the effects of heat application are essentially opposite to those of cold, its use in the treatment of acute injuries should be avoided. Because the effects of heat application are essentially opposite to those of cold, its use in the treatment of acute injuries should be avoided. Applying heat to an active inflammatory cycle will ↑ the rate of cell metabolism and accelerate the amount of hypoxic injury Applying heat to an active inflammatory cycle will ↑ the rate of cell metabolism and accelerate the amount of hypoxic injury

5 Classification of Heating Agents Superficial Superficial Infrared lamps Infrared lamps Moist heat packs Moist heat packs Paraffin baths Paraffin baths Warm whirlpools and/or immersion Warm whirlpools and/or immersion Deep heat Microwave diathermy* Shortwave diathermy Ultrasound

6 Local effects of heat application Vasodilation Vasodilation ↑rate of cell metabolism ↑rate of cell metabolism ↑ capillary permeablilty ↑ capillary permeablilty ↑delivery of leukocytes ↑delivery of leukocytes Edema formation Edema formation Removal of metabolic waste Removal of metabolic waste ↑ elasticity of ligaments, capsules, and muscle ↑ elasticity of ligaments, capsules, and muscle Analgesia and sedation of nerves Analgesia and sedation of nerves ↑nerve conduction ↑nerve conduction ↓muscle tone ↓muscle tone ↓ muscle spasm ↓ muscle spasm Perspiration Perspiration

7 Some systemic effects of Heat exposure* ↑ body temp ↑ body temp ↑ pulse rate ↑ pulse rate ↑ respiratory rate ↑ respiratory rate ↓ blood pressure ↓ blood pressure

8 General Indications/Contraindications Indications Indications Subacute or chronic inflammatory conditions Subacute or chronic inflammatory conditions Reduction of subacute or chronic pain Reduction of subacute or chronic pain Subacute or chronic muscle spasm Subacute or chronic muscle spasm ↓ ROM ↓ ROM Hematoma resolution Hematoma resolution Reduction of Joint contractures Reduction of Joint contractures Contraindications Acute injuries Impaired circulation Poor thermal regulation Anesthetic areas Neoplasms Abnormal tissue, such as a tumor, that grows at the expense of healthy tissues

9 Effects on the injury response Despite heat and cold produce many of the same outcomes, decreased pain, for example, the timing of when to begin using heat modalities is much more critical Despite heat and cold produce many of the same outcomes, decreased pain, for example, the timing of when to begin using heat modalities is much more critical If heat is applied too soon in the injury response cycle, the ↑ cell metabolism causes an increase in the number of cells injured or destroyed because of hypoxia. If heat is applied too soon in the injury response cycle, the ↑ cell metabolism causes an increase in the number of cells injured or destroyed because of hypoxia. ↑ the inflammatory rate may possibly extend the acute and subacute stages ↑ the inflammatory rate may possibly extend the acute and subacute stages

10 Cellular response For each ↑ of 18°F in skin temp, the cells metabolic rate ↑ by a factor of 2-3. For each ↑ of 18°F in skin temp, the cells metabolic rate ↑ by a factor of 2-3. As the cell’s metabolic rate ↑, so does its demand for oxygen and nutrients. As the cell’s metabolic rate ↑, so does its demand for oxygen and nutrients. As with living organisms that consume energy, the amount of waste excreted from the cell ↑ as its activity ↑ As with living organisms that consume energy, the amount of waste excreted from the cell ↑ as its activity ↑ Also, ↑ metabolic rate ↑ tissue temp. Also, ↑ metabolic rate ↑ tissue temp.

11 Blood and fluid Dynamics Response of the body to heat is dilating local blood vessels Response of the body to heat is dilating local blood vessels The amount of dilation being greater in superficial vessels than in the deeper vessels The amount of dilation being greater in superficial vessels than in the deeper vessels ↑ capillary flow results in an ↑ supply of oxygen, nutrients, and antibodies to the effected area ↑ capillary flow results in an ↑ supply of oxygen, nutrients, and antibodies to the effected area

12 The amount of edema is ↑, but the capability of removing it is greater The amount of edema is ↑, but the capability of removing it is greater ↑ capillary pressure forces edema and harmful metabolites from the injured area ↑ capillary pressure forces edema and harmful metabolites from the injured area ↑ permeability aids in the re-absorption of edema and the dissolution of hematomas. ↑ permeability aids in the re-absorption of edema and the dissolution of hematomas. These wastes can drain into the venous or lymphatic systems These wastes can drain into the venous or lymphatic systems If venous and lymphatic return is not encouraged, further edema occurs. If venous and lymphatic return is not encouraged, further edema occurs.

13 Effects on inflammation Local application of heat accelerates inflammation Local application of heat accelerates inflammation Soft tissue repair is facilitated through an accelerated metabolic rate and ↑ blood supply Soft tissue repair is facilitated through an accelerated metabolic rate and ↑ blood supply Blood flow must be ↑ to encourage the removal of cellular debris and to ↑ delivery of the nutrients necessary for the healing of tissues Blood flow must be ↑ to encourage the removal of cellular debris and to ↑ delivery of the nutrients necessary for the healing of tissues

14 ↑ oxygen stimulates the breakdown and removal of tissue debris and inflammatory metabolites ↑ oxygen stimulates the breakdown and removal of tissue debris and inflammatory metabolites Nutrients are delivered to the area to fuel the cells, and there is also an ↑ in the delivery of leukocytes, encouraging phagocytosis. Nutrients are delivered to the area to fuel the cells, and there is also an ↑ in the delivery of leukocytes, encouraging phagocytosis.

15 Muscle Spasm and Tissue Elasticity ↑ temperature reduces the primary and secondary muscle spindles’ sensitivity to stretch ↑ temperature reduces the primary and secondary muscle spindles’ sensitivity to stretch ↓ the amount of muscle spasm present ↓ the amount of muscle spasm present Increasing blood flow and reducing local muscle metabolites further alleviate spasm Increasing blood flow and reducing local muscle metabolites further alleviate spasm Most muscular tissues are not directly heated by superficial heating agents Most muscular tissues are not directly heated by superficial heating agents

16 ROM is subsequently improved by ↑ the extensibility of collagen and the viscosity and plastic deformation of tissues ROM is subsequently improved by ↑ the extensibility of collagen and the viscosity and plastic deformation of tissues This effect alone is not sufficient to ↓ contractures or ↑ the elasticity of healthy tissues This effect alone is not sufficient to ↓ contractures or ↑ the elasticity of healthy tissues Neither anterior laxity of the knee nor hamstring flexibility has been shown to be affected by heat modalities alone Neither anterior laxity of the knee nor hamstring flexibility has been shown to be affected by heat modalities alone Tension, in the form of gentle stretching, is necessary to elongate muscle and capsular tissues while the tissues are still within the therapeutic range Tension, in the form of gentle stretching, is necessary to elongate muscle and capsular tissues while the tissues are still within the therapeutic range

17 Pain Control Mechanical deformation and/or chemical irritation of nerve endings stimulate pain transmission Mechanical deformation and/or chemical irritation of nerve endings stimulate pain transmission In acute injuries, the primary cause of pain is the mechanical damage done to the tissue in the area. In acute injuries, the primary cause of pain is the mechanical damage done to the tissue in the area. In the subacute and chronic stage of injury, ischemia and irritation cause chemical pain from certain chemical mediators In the subacute and chronic stage of injury, ischemia and irritation cause chemical pain from certain chemical mediators Mechanical pain is caused by increased swelling and the tension placed on the nerves by muscle spasm Mechanical pain is caused by increased swelling and the tension placed on the nerves by muscle spasm

18 Mechanical pain is decreased by reducing the pressure on the nerves, thus lessening the pain- spasm-pain cycle. Mechanical pain is decreased by reducing the pressure on the nerves, thus lessening the pain- spasm-pain cycle. By encouraging venous and lymphatic return through the use of elevation and muscle contraction, the swelling is removed, decreasing interstitial pressure By encouraging venous and lymphatic return through the use of elevation and muscle contraction, the swelling is removed, decreasing interstitial pressure An increase in temperature leads to a state of analgesia and sedation in the injured area by acting of free nerve endings. An increase in temperature leads to a state of analgesia and sedation in the injured area by acting of free nerve endings. Nerve fiber are stimulated, blocking the transmission of pain with a conterirritant effect. Nerve fiber are stimulated, blocking the transmission of pain with a conterirritant effect. This effect appears to last only as long as the stimulus of heat is applied This effect appears to last only as long as the stimulus of heat is applied

19 Dissipation of heat When therapeutic heat is applied to the body, there is a rapid rise in skin temperature When therapeutic heat is applied to the body, there is a rapid rise in skin temperature This rise occurs because energy is being absorbed faster than the cool blood delivered to the area can remove it. This rise occurs because energy is being absorbed faster than the cool blood delivered to the area can remove it. After approximately minutes of exposure, the temperature gradient begins to even out. After approximately minutes of exposure, the temperature gradient begins to even out. At that point, the body is able to counteract the energy being applied by supplying an adequate amount of blood to cool the area At that point, the body is able to counteract the energy being applied by supplying an adequate amount of blood to cool the area

20 At this time, the patient may claim that the modality has cooled down when, in fact, its intensity is unchanged. At this time, the patient may claim that the modality has cooled down when, in fact, its intensity is unchanged. When a maximal vasodilation has occurred and the intensity of the treatment stays constant (or increases), the vessels begin to constrict. When a maximal vasodilation has occurred and the intensity of the treatment stays constant (or increases), the vessels begin to constrict. The phenomenon, known as rebound vasoconstriction, will occur approx 20 min into the treatment. The phenomenon, known as rebound vasoconstriction, will occur approx 20 min into the treatment. This is the body’s attempt to save underlying tissues by sacrificing the superficial layer. This is the body’s attempt to save underlying tissues by sacrificing the superficial layer. If the intensity of the tx is too great or if the duration is to long, burns will result If the intensity of the tx is too great or if the duration is to long, burns will result Mottling of the skin is a warning sign that tissue temp are rising to a dangerously high level. Mottling of the skin is a warning sign that tissue temp are rising to a dangerously high level. In this case, ghost white areas and beet-red splotches mark the patients skin In this case, ghost white areas and beet-red splotches mark the patients skin When this occurs, the tx should be discontinued immediately When this occurs, the tx should be discontinued immediately

21 Heat vs Cold How do you know when to use heat and when to use cold?? How do you know when to use heat and when to use cold?? There are no clear cut answers to this question. There are no clear cut answers to this question. Many articles have given definitive time frames, such as: Many articles have given definitive time frames, such as: Use cold for the first 24 hrs Use cold for the first 24 hrs And use heat for the next 48 hrs And use heat for the next 48 hrs Unfortunately, statements like these are incorrect and unjustified. Unfortunately, statements like these are incorrect and unjustified.

22 One of this first statements made in this class was that the body heals an injury at its own rate. One of this first statements made in this class was that the body heals an injury at its own rate. Not only does this rate vary from person to person but also it may vary from injury to injury in the same person Not only does this rate vary from person to person but also it may vary from injury to injury in the same person The patients physical and psychological state, as well as the type and amount of tissue damaged, factor into the time frame for required for healing. The patients physical and psychological state, as well as the type and amount of tissue damaged, factor into the time frame for required for healing.

23 The decision-making process is similar to the steps involved when a pipe ruptures in the basement of a house The decision-making process is similar to the steps involved when a pipe ruptures in the basement of a house Before bailing out the water and cleaning up the mess, you have to stop the leak. Before bailing out the water and cleaning up the mess, you have to stop the leak. Likewise, before encouraging as increase in the rate of cell metabolism in an injured area, the active process of inflammation must be calmed down first. Likewise, before encouraging as increase in the rate of cell metabolism in an injured area, the active process of inflammation must be calmed down first.

24 Remember cold is indicated under 3 conditions Remember cold is indicated under 3 conditions In the acute stages of the inflammation reaction In the acute stages of the inflammation reaction Before ROM exercises Before ROM exercises After physical activity After physical activity Heat application is indicated under 5 conditions Heat application is indicated under 5 conditions To control inflammation reaction in its subacute or chronic stages To control inflammation reaction in its subacute or chronic stages To encourage tissue healing To encourage tissue healing To reduce edema and ecchymosis To reduce edema and ecchymosis To improve ROM before physical activity or rehabilitation To improve ROM before physical activity or rehabilitation To promote drainage from an infected site To promote drainage from an infected site

25 Deciding whether to use heat or cold Does the body area feel warm to the touch? Does the body area feel warm to the touch? Is the injured area still sensitive to light or moderate touch? Is the injured area still sensitive to light or moderate touch? Does the amount of swelling continue to increase over time? Does the amount of swelling continue to increase over time? Does swelling increase during activity? Does swelling increase during activity? Does pain limit the joint’s ROM? Does pain limit the joint’s ROM? Would you consider the acute inflammation process to still be active? Would you consider the acute inflammation process to still be active? Does the patient continue to display improvement with the use of cold modalities? Does the patient continue to display improvement with the use of cold modalities? If the answers to these questions are “No” heat can safely be used. As the number of “yes” answers increases, so does the indication for use of cold If the answers to these questions are “No” heat can safely be used. As the number of “yes” answers increases, so does the indication for use of cold

26 Paraffin Bath A paraffin bath contains a mixture of was and mineral oil in the ratio of 7 parts wax to 1 part oil A paraffin bath contains a mixture of was and mineral oil in the ratio of 7 parts wax to 1 part oil Melted paraffin is kept at a constant temperature of ° F Melted paraffin is kept at a constant temperature of ° F Temps for tx given to the lower extremity are decreased ( ° F) because circulation is less efficient Temps for tx given to the lower extremity are decreased ( ° F) because circulation is less efficient Because of its low specific heat paraffin can provide approx 6 times the amount of heat as water Because of its low specific heat paraffin can provide approx 6 times the amount of heat as water

27 Paraffin is a superficial heating agent used for delivering heat to small, irregular shaped areas Paraffin is a superficial heating agent used for delivering heat to small, irregular shaped areas Fingers Fingers Wrist Wrist Hand Hand Foot Foot Although its use in sports medicine is limited, it is an effective method for delivering heat, and this form of application of paraffin is beneficial in chronic conditions in which ROM is not an essential part of the tx protocol Although its use in sports medicine is limited, it is an effective method for delivering heat, and this form of application of paraffin is beneficial in chronic conditions in which ROM is not an essential part of the tx protocol Arthritis Arthritis Chronic inflammatory conditions Chronic inflammatory conditions

28 Effects on the IRC In addition to the standard effects of heat, paraffin increases perspiration in the treated area which soften and moisturizes the skin In addition to the standard effects of heat, paraffin increases perspiration in the treated area which soften and moisturizes the skin

29 Setup and Application Several methods of application, each with its own advantages and disadvantages Several methods of application, each with its own advantages and disadvantages Paraffin can act as an insulator is allowed to dry on the skin Paraffin can act as an insulator is allowed to dry on the skin With this in mind, the amount of heat delivered can be adjusted by increasing or decreasing the wax layers With this in mind, the amount of heat delivered can be adjusted by increasing or decreasing the wax layers

30 Prep for treatment To avoid contamination of the mixture, the body part to be treated should be thoroughly cleaned and dried before treatment. To avoid contamination of the mixture, the body part to be treated should be thoroughly cleaned and dried before treatment. Immersion bath Immersion bath Thoroughly clean skin Thoroughly clean skin The patient begins by dipping the body part into the paraffin and removing it. Allow this coat to dry The patient begins by dipping the body part into the paraffin and removing it. Allow this coat to dry Dip the extremity into the wax 6-12 times to develop the amount of insulation necessary. Allow wax to dry between dips Dip the extremity into the wax 6-12 times to develop the amount of insulation necessary. Allow wax to dry between dips

31 Instruct the patient to avoid touching the sides and bottom of the heating unit because burns may result Instruct the patient to avoid touching the sides and bottom of the heating unit because burns may result Instruct the patient who is receiving an immersion not to move the joints that are in the liquid. The cracking of the wax will allow fresh paraffin to touch the skin, increasing the risk of burns Instruct the patient who is receiving an immersion not to move the joints that are in the liquid. The cracking of the wax will allow fresh paraffin to touch the skin, increasing the risk of burns After the treatment, scrape off the hardened paraffin and return it to the unit for reheating, or discard it After the treatment, scrape off the hardened paraffin and return it to the unit for reheating, or discard it

32 Pack (glove) Method The glove method is the safest but least effective way for delivering heat to the body with paraffin wax The glove method is the safest but least effective way for delivering heat to the body with paraffin wax This method is recommended for those patients who are in the subacute stages of healing or have a vascular or nerve condition that would predispose them to burning This method is recommended for those patients who are in the subacute stages of healing or have a vascular or nerve condition that would predispose them to burning The body part may also be elevated during this form of paraffin application The body part may also be elevated during this form of paraffin application

33 Thoroughly clean the body part Thoroughly clean the body part Begin treatment by immersing the extremity in the wax so that it becomes completely covered. Remove the body part and allow wax to dry Begin treatment by immersing the extremity in the wax so that it becomes completely covered. Remove the body part and allow wax to dry Continue dipping for 7-12 times allowing wax to dry between dips Continue dipping for 7-12 times allowing wax to dry between dips After the final dip, cover the extremity with a plastic bag, aluminum foil, or wax paper. Then wrap and secure a terry cloth towel around the area After the final dip, cover the extremity with a plastic bag, aluminum foil, or wax paper. Then wrap and secure a terry cloth towel around the area If indicated, the body part may be elevated. If indicated, the body part may be elevated. Following the treatment, remove the towel and the inner layering. Scrape off the hardened paraffin and return it to the bath for reheating, or discard it Following the treatment, remove the towel and the inner layering. Scrape off the hardened paraffin and return it to the bath for reheating, or discard it

34 Duration of treatment Paraffin treatments are given for minutes and may be repeated several times daily Paraffin treatments are given for minutes and may be repeated several times daily

35 Precautions The sensation of the paraffin is misleading as to the actual temp of the treatment. The temp of the paraffin is sufficient to cause burns, but its specific heat and thermal capacity requires a longer period of time to transfer the energy The sensation of the paraffin is misleading as to the actual temp of the treatment. The temp of the paraffin is sufficient to cause burns, but its specific heat and thermal capacity requires a longer period of time to transfer the energy Avoid using paraffin with athletes who are required to catch or throw a ball or workers who are required to maintain a good grip after the treatment. Avoid using paraffin with athletes who are required to catch or throw a ball or workers who are required to maintain a good grip after the treatment.

36 Indications/contraindications Indications Indications Subacute or chronic inflammatory conditions Subacute or chronic inflammatory conditions Skin infections Skin infections Peripheral nerve injuries before electrical stimulation Peripheral nerve injuries before electrical stimulation Another modality should be considered if the patient lacks temp perception Another modality should be considered if the patient lacks temp perception Contraindications Acute conditions Peripheral vascular disease Areas with sensory loss or scaring sunburns

37 Next time Shortwave diathermy Shortwave diathermy Lab Lab

38 Infrared Lamp Provide radiant energy for superficial heating of the skin Provide radiant energy for superficial heating of the skin They are considered radiant modalities because no medium is required to transmit energy They are considered radiant modalities because no medium is required to transmit energy 2 types 2 types Near infrared (luminous) Near infrared (luminous) Far infrared (nonluminous) Far infrared (nonluminous) Treatment energy is produced by passing an electrical current through a carbon or tungsten filament Treatment energy is produced by passing an electrical current through a carbon or tungsten filament

39 The intensity of the treatment is controlled by adjusting the current flow through the filament or by changing the distance between the lamp and the tissues The intensity of the treatment is controlled by adjusting the current flow through the filament or by changing the distance between the lamp and the tissues Luminous generators produce some degree of visible light Luminous generators produce some degree of visible light Which places them on the “near” end of the infrared spectrum Which places them on the “near” end of the infrared spectrum Because visible light is present, some of the treatment energy is reflected by the surface of the skin Because visible light is present, some of the treatment energy is reflected by the surface of the skin Nonluminous generators do not produce visible light Nonluminous generators do not produce visible light Placing them on the “far” end of the infrared spectrum Placing them on the “far” end of the infrared spectrum

40 Nonluminous infrared radiation is less penetrating than luminous Nonluminous infrared radiation is less penetrating than luminous It has effects at 2mm and at 5-10mm beneath the surface of the skin It has effects at 2mm and at 5-10mm beneath the surface of the skin Because nonluminous infrared is less penetrating, the skin being treated will feel warmer than with luminous Because nonluminous infrared is less penetrating, the skin being treated will feel warmer than with luminous Not commonly used in a clinical setting, because of the wide range of heating modalities available Not commonly used in a clinical setting, because of the wide range of heating modalities available However, it was once thought to assist in the healing of open wounds, such as turf burns However, it was once thought to assist in the healing of open wounds, such as turf burns but it actually deters the healing process because it dehydrates the tissues but it actually deters the healing process because it dehydrates the tissues

41 Effect on the IRC Heats the skin almost exclusively Heats the skin almost exclusively Deeper tissues are heated by conduction to depths up to 1 cm. Deeper tissues are heated by conduction to depths up to 1 cm. Primary physiological effects occur almost entirely in the superficial skin Primary physiological effects occur almost entirely in the superficial skin Hyperemia occurs as a result of increased capillary flow and increased capillary pressure Hyperemia occurs as a result of increased capillary flow and increased capillary pressure

42 Setup and application Warm up the lamp if necessary Warm up the lamp if necessary To prevent the concentration of heat, clean the area of any sweat, dirt, or oils, and remove any jewelry To prevent the concentration of heat, clean the area of any sweat, dirt, or oils, and remove any jewelry Position the patient in a comfortable manner. Drape the body part so that only the area to be treated is exposed Position the patient in a comfortable manner. Drape the body part so that only the area to be treated is exposed If a moist heat treatment is desired, place a damp terry cloth towel over the area If a moist heat treatment is desired, place a damp terry cloth towel over the area

43 Place the lamp so that the source of heat is approx 24 inches away from the patient. Adjust the lamp so the energy will strike the tissues at a right angle (inverse square law) Place the lamp so that the source of heat is approx 24 inches away from the patient. Adjust the lamp so the energy will strike the tissues at a right angle (inverse square law) To prevent burns, instruct the patient not to move To prevent burns, instruct the patient not to move Check the patients comfort periodically. The intensity may be adjusted by moving the lamp toward the skin (increasing temp) or away from the skin (decreasing temp) Check the patients comfort periodically. The intensity may be adjusted by moving the lamp toward the skin (increasing temp) or away from the skin (decreasing temp) Instruct the patient to summon assistance if the intensity of the treatment becomes too great Instruct the patient to summon assistance if the intensity of the treatment becomes too great

44 Duration of treatment minutes minutes Given as needed Given as needed

45 Indications/contraindications Indications Indications Subacute or chronic inflammatory conditions Subacute or chronic inflammatory conditions Skin infections Skin infections Peripheral nerve injuries before electrical stimulation Peripheral nerve injuries before electrical stimulation Another modality should be considered if the patient lacks temp perception Another modality should be considered if the patient lacks temp perception Contraindications Contraindications Acute conditions Acute conditions Peripheral vascular disease Peripheral vascular disease Areas with sensory loss or scarring Areas with sensory loss or scarring sunburns sunburns

46 Shortwave Diathermy A deep-heating modiality A deep-heating modiality Uses energy that is similar to broadcast radio waves but has a shorter wave length Uses energy that is similar to broadcast radio waves but has a shorter wave length The energy is delivered to the body is acutally a high-frequency alternating current, but lacks the properties needed to depolarize motor or sensory nerves. The energy is delivered to the body is acutally a high-frequency alternating current, but lacks the properties needed to depolarize motor or sensory nerves. The Federal communication Commission has reserved the frequencies of 13.56, 27.12, and for medical use The Federal communication Commission has reserved the frequencies of 13.56, 27.12, and for medical use

47 Structures with high water content, like adipose tissue, blood, and muscle, are selectively heated at depths of 2-5cm. Structures with high water content, like adipose tissue, blood, and muscle, are selectively heated at depths of 2-5cm. Local tissue temp may reach 107 °, but the subcutaneous fat layer dissipates a significant portion of the energy Local tissue temp may reach 107 °, but the subcutaneous fat layer dissipates a significant portion of the energy This leads to a secondary heating of the superficial muscle layer by heat conducted from the adipose tissue This leads to a secondary heating of the superficial muscle layer by heat conducted from the adipose tissue The amount of intramuscular temp increase compares favorably with that seen during ultrasound application The amount of intramuscular temp increase compares favorably with that seen during ultrasound application Producing an increase of more than 7 degrees F Producing an increase of more than 7 degrees F

48 Because of the relatively large area affected by diathermy, the deep heating effects are longer lasting than those experienced with ultrasound Because of the relatively large area affected by diathermy, the deep heating effects are longer lasting than those experienced with ultrasound However, it is less effective on those persons who have a large amount of subcutaneous fat. However, it is less effective on those persons who have a large amount of subcutaneous fat. 2 units that are commonly used 2 units that are commonly used The condenser unit The condenser unit The conduction unit The conduction unit

49 Condenser unit Application by way of a condenser unit places the patient within the actual circuit of the machines unit Application by way of a condenser unit places the patient within the actual circuit of the machines unit 2 insulated plates are place on either side of the site being treated 2 insulated plates are place on either side of the site being treated The flow of electromagnetic energy passes through the tissues, which act as electrical resistors and produce frictional heating The flow of electromagnetic energy passes through the tissues, which act as electrical resistors and produce frictional heating Heating occurs at depths of cm but is uneven because of differences in the resistance to energy transportation of various tissues Heating occurs at depths of cm but is uneven because of differences in the resistance to energy transportation of various tissues When condenser plates or pads are used, heating tends to occur in the subcutaneous tissues and the superficial muscle layer When condenser plates or pads are used, heating tends to occur in the subcutaneous tissues and the superficial muscle layer

50 Induction Unit Does not place the patient directly in the units circuit. Does not place the patient directly in the units circuit. Tissues are affected by radiation emitted form the electromagnetic field created by the electrode Tissues are affected by radiation emitted form the electromagnetic field created by the electrode The effects of the induction method may heat tissues up to 5cm beneath the skin The effects of the induction method may heat tissues up to 5cm beneath the skin But the primary temp increase occurs in the superficial and middle muscle layers But the primary temp increase occurs in the superficial and middle muscle layers

51 The tissues are place in the electromagnetic field by the use of an insulated cable electrode The tissues are place in the electromagnetic field by the use of an insulated cable electrode The cable may be wrapped around the extremity or coiled flat like a pancake and placed on the skin The cable may be wrapped around the extremity or coiled flat like a pancake and placed on the skin Another method ahs the cable in a self- contained drum Another method ahs the cable in a self- contained drum

52 Effects on the IRC Heating properties are similar to those of other forms of heat application Heating properties are similar to those of other forms of heat application But tend to occur deeper within the tissues and are based on the treatment intensity But tend to occur deeper within the tissues and are based on the treatment intensity During vigorous heating skin temp in the treated area increases 4.3 degrees, and the intra-articular temp of the knee increases 2.5 degrees. During vigorous heating skin temp in the treated area increases 4.3 degrees, and the intra-articular temp of the knee increases 2.5 degrees. Blood flow in the deeper tissues increases, and fibroblastic activity, collagen deposition, and new capillary growth are stimulated. Blood flow in the deeper tissues increases, and fibroblastic activity, collagen deposition, and new capillary growth are stimulated.

53 Muscle spasm is reduced by the sedation of sensory and motor nerves Muscle spasm is reduced by the sedation of sensory and motor nerves As with all heat applications, there is a local increase in cellular metabolic rate and in perspiration, which must be removed during the treatment As with all heat applications, there is a local increase in cellular metabolic rate and in perspiration, which must be removed during the treatment

54 General prep There must be no metal within the immediate treatment area. The presence of metal will collect and concentrate the energy from the treatment in the same manner that an antenna collects radio waves There must be no metal within the immediate treatment area. The presence of metal will collect and concentrate the energy from the treatment in the same manner that an antenna collects radio waves For personal safety, the clinician should remove any rings, watches, bracelets, and so on For personal safety, the clinician should remove any rings, watches, bracelets, and so on Cover the area to be treated with a dry terry cloth towel to absorb perspiration. A portion of the treatment area must remain visible to check for burns during treatment. Avoid any moisture buildup during the treatment because water tends to collect heat. The intensity must be turned to “zero” before drying the area Cover the area to be treated with a dry terry cloth towel to absorb perspiration. A portion of the treatment area must remain visible to check for burns during treatment. Avoid any moisture buildup during the treatment because water tends to collect heat. The intensity must be turned to “zero” before drying the area

55 Condenser method Plate setup Plate setup Adjust the plates so that they are parallel to the skin, 1 inch above the patient. On most units, it is essential that both plates be placed at an equal distance above the tissue. This adjustment can be accomplished by using a spacer, such as a piece of wood. Place the spacer on the patient and lower the plate until the plate and the spacer touch. Remove the spacer and repeat for the other plate. The spacer must be removed before the treatment is started. Adjust the plates so that they are parallel to the skin, 1 inch above the patient. On most units, it is essential that both plates be placed at an equal distance above the tissue. This adjustment can be accomplished by using a spacer, such as a piece of wood. Place the spacer on the patient and lower the plate until the plate and the spacer touch. Remove the spacer and repeat for the other plate. The spacer must be removed before the treatment is started.

56 Consult the user’s manual for the minimum and maximum distance allowed between the condenser plates. Consult the user’s manual for the minimum and maximum distance allowed between the condenser plates. Condenser pad setup Condenser pad setup Cover the area to be treated with six layers of toweling Cover the area to be treated with six layers of toweling Place the condenser pads on the toweling. If the pads are used on the same side of the body, place them as far apart as possible. If they are used on the opposite side of the body part (anterior or posterior, medial or lateral), avoid having the patient lie on the pad Place the condenser pads on the toweling. If the pads are used on the same side of the body, place them as far apart as possible. If they are used on the opposite side of the body part (anterior or posterior, medial or lateral), avoid having the patient lie on the pad Secure the pads in place with sandbags or something like that. Secure the pads in place with sandbags or something like that.

57 Induction Method Cable setup Cable setup Place six layers of toweling around the body part Place six layers of toweling around the body part Using spacers, wrap the cable around the body part, leaving a minimum of 1” between the coils. The leads to and from the coil should be of equal length Using spacers, wrap the cable around the body part, leaving a minimum of 1” between the coils. The leads to and from the coil should be of equal length Secure the cable ends so that they do not touch each other, the patient, or the shortwave unit itself Secure the cable ends so that they do not touch each other, the patient, or the shortwave unit itself

58 Coil setup Coil setup Using spacers, form a coil of at least three circles approximately equal to the area being treated. There should be a minimum of 1” between the circles, and the leads should be of equal length. Use an insulator or 1” of padding to separate the end of the inner coil from the coil itself Using spacers, form a coil of at least three circles approximately equal to the area being treated. There should be a minimum of 1” between the circles, and the leads should be of equal length. Use an insulator or 1” of padding to separate the end of the inner coil from the coil itself Insulate the skin with at least 6 layers of toweling Insulate the skin with at least 6 layers of toweling Place the coil on the patient and lightly secure in place with sandbags Place the coil on the patient and lightly secure in place with sandbags Position the leads so they do not come in contact with each other, the patient, or the unit. Position the leads so they do not come in contact with each other, the patient, or the unit.

59 Drum setup Drum setup Position the drum approx.5-1” above the toweling. There is a direct relationship between the distance of the drum from the patient and the intensity of energy required for the treatment. Position the drum approx.5-1” above the toweling. There is a direct relationship between the distance of the drum from the patient and the intensity of energy required for the treatment.

60 Application Turn the unit on: allow it to warm up if necessary Turn the unit on: allow it to warm up if necessary Some units must be turned to allow for maximal energy transfer. If tuning is necessary, consult the user’s manual and follow the manufacturer’s instructions. Some units must be turned to allow for maximal energy transfer. If tuning is necessary, consult the user’s manual and follow the manufacturer’s instructions. Instruct the patient not to move until the machine is turned off. Instruct the patient not to move until the machine is turned off. Increase the intensity until the athlete feels mild warmth Increase the intensity until the athlete feels mild warmth

61 If the electrodes must be moved or if it becomes necessary to dry the area, return the intensity to zero before making any adjustments If the electrodes must be moved or if it becomes necessary to dry the area, return the intensity to zero before making any adjustments Check patient regularly. Observe the skin for signs of burns, and inquire as to any unusual sensations. Adjust as necessary Check patient regularly. Observe the skin for signs of burns, and inquire as to any unusual sensations. Adjust as necessary After the treatment, return the intensity dial to “zero” and shut off the unit. After the treatment, return the intensity dial to “zero” and shut off the unit.

62 Duration of treatment At moderate intensities, treatments may be given for minutes and may be repeated as needed for 2 weeks. When higher treatment temps are used, decrease the duration of treatment and apply on alternate days. At moderate intensities, treatments may be given for minutes and may be repeated as needed for 2 weeks. When higher treatment temps are used, decrease the duration of treatment and apply on alternate days.

63 Precautions Many states require a physician’s prescriptions for the application of SWD. Many states require a physician’s prescriptions for the application of SWD. Never allow the cables to touch each other. This may create a short circuit Never allow the cables to touch each other. This may create a short circuit The skin exposed to the treatment must always be covered by at least.5” of toweling The skin exposed to the treatment must always be covered by at least.5” of toweling Do not allow perspiration to collect in the treatment field Do not allow perspiration to collect in the treatment field

64 Never allow the skin to come into direct contact with the heating unit or cables. Severe burns may result. Never allow the skin to come into direct contact with the heating unit or cables. Severe burns may result. Excessive amounts of adipose tissue overlying the treatment area can result in overheating the skin Excessive amounts of adipose tissue overlying the treatment area can result in overheating the skin Overheating of the patients tissues may cause tissue damage without any immediate signs. Deep-tissue burning can cause destruction of muscular tissue of subcutaneous fat necrosis. Overheating of the patients tissues may cause tissue damage without any immediate signs. Deep-tissue burning can cause destruction of muscular tissue of subcutaneous fat necrosis. A deep, aching sensation may be a symptom of overheating the tissues A deep, aching sensation may be a symptom of overheating the tissues

65 It is difficult to heat only localized areas. Water pathways within the tissues dissipate heat formed in the treated area It is difficult to heat only localized areas. Water pathways within the tissues dissipate heat formed in the treated area The electromagnetic energy is not localized to the treatment area, radiating 2 to 3 feet from the source of continuous SWD and 2 feet from the source of pulsed diathermy. Clinicians may be placed in the field of this scattering radiation, possibly overexposing them to diathermy. A distance of 3 feet from the source of the energy should be maintained to ensure the operator’s safety. The electromagnetic energy is not localized to the treatment area, radiating 2 to 3 feet from the source of continuous SWD and 2 feet from the source of pulsed diathermy. Clinicians may be placed in the field of this scattering radiation, possibly overexposing them to diathermy. A distance of 3 feet from the source of the energy should be maintained to ensure the operator’s safety.

66 Indications Joint inflammation (bursitis, tendinitis, synovitis) Use with caution as the deep heating may cause collagen destruction within the joint. Joint inflammation (bursitis, tendinitis, synovitis) Use with caution as the deep heating may cause collagen destruction within the joint. Large areas, such as the paraspinal muscles, that cannot be effectively heated through other methods because of the size of the target tissues Large areas, such as the paraspinal muscles, that cannot be effectively heated through other methods because of the size of the target tissues Fibrositis Fibrositis Myositis Myositis Subacute and chronic inflammatory conditions in deep- tissue layers Subacute and chronic inflammatory conditions in deep- tissue layers osteoarthritis osteoarthritis

67 Contraindications Ischemic areas: the increased metabolic rate increases the need for oxygen, causing further hypoxia Ischemic areas: the increased metabolic rate increases the need for oxygen, causing further hypoxia Peripheral vascular disease Peripheral vascular disease Metal implants or metals such as jewelry. The metal collects and concentrates the energy, potentially causing burns Metal implants or metals such as jewelry. The metal collects and concentrates the energy, potentially causing burns Perspiration and moist dressings. The water collects and concentrates the heat Perspiration and moist dressings. The water collects and concentrates the heat

68 Tendency to hemorrhage, including menstruation. Tendency to hemorrhage, including menstruation. Cancer Cancer Fever Fever Sensory loss Sensory loss Cardiac pacemakers Cardiac pacemakers Areas of particular sensitivity Areas of particular sensitivity Epiphyseal plates in children, the genitals, sites of infection, the abdomen with an implanted intrauterine device (IUD), the eyes and face Epiphyseal plates in children, the genitals, sites of infection, the abdomen with an implanted intrauterine device (IUD), the eyes and face


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