Presentation on theme: "Assistant lecturer of Anaesthesia and Intensive Care"— Presentation transcript:
1 Assistant lecturer of Anaesthesia and Intensive Care CasePresentationByEeman Abou BakrAssistant lecturer of Anaesthesia and Intensive Care
2 You have been called to anesthesia and emergency department to provide anesthesia for reduction of a colle’s fracture.The patients is a 68 years old, heavy smoker and drinker who has been involved in a fire she has burns to her face, chest and arms.
3 Questions What assessment of the patients would you make? Discuss airway assessment,The significance of perform SaO2 and other investigations you would perform (COHb).What are the indications for intubations.What fluid requirements will patients have ?What fluid would you give, when you give, and why ?Discuss analgesia, are burns painful ?Would you give an anesthetic for the fracture ?Where should the patient be looked after ?
5 Step 1: Initial Assessment Assessment of the burn patient follows the standard EMS assessment pattern:Airway: does the patient have a patent airway?Breathing: is the patient breathing adequately?Circulation: Is the patient’s circulatory and cardiac status stable?Neurological status: AVPUNote: burns do NOT alter mentation—if the patient is un-alert or disoriented, something else is going on!Expose the patient, and treat for hypothermia
6 Secondary Survey History: obtain burn specific history How did the burn occur?Did the patient’s clothing ignite?Were accelerants involved?Was patient found in smoke-filled room?Did the patient leap from a window, fall, or roll a vehicle?Are the purported circumstances of the injury consistent with the burn characteristics? Is abuse a possibility?
7 Secondary Survey (Cont’d.) Head-to-toe: look carefully for injuries other than the actual burnStart detailed physical examinationEstablish an adequate IV accessBurn injuries are not considered immediate life threats, but they do often accompany traumatic injuries that are life threats!
8 Step 2: Determining Burn Severity Burn severity is determined primarily by assessing the extent of the burn as percentage of total body surface area, and its depth‘Partial/full thickness’ and ‘1st/2nd/3rd degree’ are acceptable terminologyFirst and second degree burns are partial thickness burnsThird degree burns are full thickness burns
10 Determining Burn Severity (Cont’d) First degree burns (epidermal burns) are red,appear DRY, blanch when pressed upon,and blister mildly.Second degree (dermal) burns tend tobe red or yellowish, appear WET, usuallyblister, and may or may not blanchThird degree (subcutaneous) burnsappear very DRY, may be yellow, gray orblack, do not blanch, and are ‘leathery’ to touch.
11 Patient is: 68 yrs old. Fire – burns to face, chest and arms. Colle’s fracture.Heavy smoker.Drinker.First of all trauma patient !!
14 This patient at RISK of developing inhalational injury due to Unable to escape fire due toExtremes of ageImmobility due to other traumaReduction of level of consciousness: alcohol, drugs, effects of smoke.Lack of functional smoke detectorChronic pulmonary disorders: asthma, COPD morbidity of smoke inhalation increased.
15 Airway assessment (Cont’d) History- Was the fire in an enclosed space.- Duration of exposure.-What type of material burned, e.g., paints, chemicals.- Level of consciousness on scene.
16 Airway assessment (Cont’d) Burns and smoke inhalation victims should be treated as a “trauma” patient, with trauma protocol being followed as routine. This includes cervical immobilization until injury is excluded.
17 Airway assessment (Cont’d) Examination- Stridor: indicates severe laryngeal edema and the possibility of imminent airway obstruction- Voice hoarseness—an excellent warning sign- Tachypnea- Use of accessory muscles- Persistent cough- Soot in oropharynx- Singed nasal hair
18 Carbonaceous particles staining a patient’s face after a burn in an enclosed space. This suggests there is inhalational injury
19 Airway assessment (Cont’d) Laryngoscopy detect edema to the pharynx or larynx or vocal cords.BronchoscopyAirway edemaMucosal slougingCharring or soot
21 Discuss the significance to perform SaO2 and other investigations you would perform as(COHb).
22 Oxygen saturation(SaO2) SaO2 is inaccurate in the presence of significant carboxyhemoglobin (COHb) or methemoglobinemia.
23 Carbon Monoxide Poisoning Asphyxiation and/or carbon monoxide poisoning causes most fire scene fatalitiesInhaled carbon monoxide bonds to hemoglobin in the blood, taking the place of oxygen with approximately 200 times greater affinity.The pulse oximiter, which measures bonded hemoglobin, will deliver a normal reading, even when the patient is hypoxic, or dead
24 Carbon Monoxide Poisoning Cherry-red lips, skin and nail beds occur in only 50% of patients with severe carbon monoxide poisoning and are not a clinically reliable indicatorIf sufficient carbon monoxide is inhaled, tissue perfusion WILL cease, and the patient WILL dieCO2 removal is not affected, so ET capnography does remain an accurate indicator of ET placementThe only accurate assessment is blood level carboxyhemoglobin, which must be assessed at the hospital
25 Signs of Carboxyhaemoglobinaemia COHb levelsSymptoms0-10%Minimal (normal level in heavy smokers)10-20%Nausea, headache20-30%Drowsiness, lethargy30-40%Confusion, agitation40 -50%Coma, respiratory depression>50%DeathCOHb = Carboxyhaemoglobin
26 Investigations for major burns GeneralFull blood count, packed cell volume, urea and electrolyte concentration, clotting screen, liver enzymesBlood group, and save or crossmatch serum12 lead electrocardiographyCardiac enzymes
27 Investigations for major burns For inhalational injury:Arterial Blood Gases—mandatoryChest x-ray—Frequently normal initially but essential nonetheless as baseline assessment and to exclude trauma.
28 What are the indications of intubation? Early intubation required to treat “4” causes of respiratory dysfunction:1. CO poisoning2. Upper airway edema3. Subglottic thermal and chemical burns4. Chest wall restriction
29 What fluid requirement will patient have ? What fluid would you give when you give and why ?
30 Fluid Resuscitation Related to: extent of burn (rule of nines)body size (pre-injury weight estimate)Delivered through large bore peripheral IVAttempt to avoid overlying burned skinCan use venous cut down or central line
31 Fluid Resuscitation Goal: Maintain perfusion to vital organs Fluid requirement calculations for infusion rates are based on the time from injury, not from the time fluid resuscitation is initiated.
32 Resuscitation Fluid Needs: First 24 Hours Parkland Formula:Adults: ml RL x Kg body weight x % burnFirst half of volume over first 8 hours, second half over following 16 hoursHypovolemia, decreased COIncreased capillary permeabilityCrystalloid fluid is keystone, colloid not useful
33 Lactated Ringers - preferred solution Fluid resuscitationLactated Ringers - preferred solutionContains Na+ - restoration of Na+ loss is essentialFree of glucose – high levels of circulating stress hormones may cause glucose intolerance
34 Resuscitation Fluid Needs: Second 24 Hours Capillary permeability gradually returns to normal30–50% burn: 0.3 mL/kg body weight per % burn50–70% burn: 0.4 mL/kg body weight per % burn>70% burn: 0.5 mL/kg body weight per % burnUsually check for BP, CVP and urinary output.
39 Analgesia Pain management is indicated for most burns. First degree and superficial second degree burns are generally painful.Full thickness burns are not painful due to destruction of the dermis.
40 Morphine is the drug of choice for pain AnalgesiaMorphine is the drug of choice for painShould be titrated intravenously only.Subcutaneous and intramuscular routes become trapped in tissues by edema and can induce respiratory arrest as the edema resolves which may kill the patient.Morphine is of choice for (background pain).
41 For extremely painful procedures in both emergency and acute phase, Fentanyl has a major advantage. It is shorter acting (procedural pain).It avoids over sedation following a procedure.Other drugs as Benzodiazepines may be indicated to clam patients in anxiety induced hyperventilations.
42 Would you give an anesthetic for the fracture ? To answer this question we must know what is the pathophysiology of burn injury
43 Fluid and Electrotype Shifts—Emergent Phase Generalized dehydrationReduced blood volume and hemoconcentrationDecreased urine outputTrauma causes release of potassium into extracellular fluid: hyperkalemiaSodium traps in edema fluid and shifts into cells as potassium is released: hyponatremiaMetabolic acidosis
44 Fluid and Electrolyte Shifts—Acute Phase Fluid reenters the vascular space from the interstitial spaceHemodilutionIncreased urinary outputSodium is lost with diuresis and due to dilution as fluid enter vascular space: hyponatremiaPotassium shifts from extracellular fluid into cells: potential hypokalemiaMetabolic acidosis
45 Three variables estimate a high probability of death Age > 60Burn more than 40% TBSAPresence of inhalational injuryOther variables include:Presence of coexisting diseaseDelay in resuscitation
46 Anesthetic management for this patient Give anesthesia for patients as soon as hemodynamics are stabilized.Regional anesthesia can be used effectively in small burns or patients undergoing reconstructive procedures.For upper extremity procedures brachial plexus block may be considered as primary anesthetic or as an adjunct for postoperative pain control.In this patient as there is injury to both the arms and chest regional anesthesia would be a difficult choice.
47 Remember also: Casts over burn must be avoided. Avoid prolonged immobilization of joints in burn area.Therefore external and internal fixation techniques are of choice.
48 Operative managementKetamine has many advantages for burn patients as an induction and maintenance agent.Induction dose mg/Kg.Ketamine preserves hemodynamics compared to other IV anesthetics.Airway reflexes remain more intact with small risk of aspirationMaintenance can be done by volatile agents opioid nitrous oxide.
49 Muscle relaxantsSuccinylcholine is contraindicated un the first 24 hours (cardiac arrest)Burn patients require higher than normal doses of non depolarizing muscle relaxants duet o altered protein binding and increase in extrajunctional acetyl choline receptors.Note :Consider alcoholic liver cirrhosisConsider COPD patient
51 This patient should be admitted to ICU Second and third degree ≥ 20% TBSA.Second and third degree burns that involve face, hands, genitalia perineum and major joints.Full thickness burn ≥5% TBSA.Inhalational injury.Burn in patient with pre-existing medical conditions alcoholic smoker.
52 Discuss your management in this critical situation what would you do if an anesthetized patient suddenly became hard to ventilate?Discuss your management in this critical situationWhat are the signs of pneumothorax?How should a pneumothorax be treated?
53 Ventilation may be difficult because of a problem with one of three sites: Anesthetic equipment (ventilator, anesthetic breathing system)Airway device (endotracheal tube, laryngeal mask, face mask)The patient.
54 ManagementThe anesthetist should immediately look for obvious causes. Airway pressure may be high immediately after intubation, when neuromuscular blockade has decreased and if the airway is kinked.If there is no obvious cause, the anesthetist should have a systematic approach to the diagnosis of high airway pressure
55 ManagementGas supplyBreathing circuit: (hand ventilate the patient with a selfinflating resuscitation bag)Airway: not kinked or obstructed(suction catheter)Lungs: Look for bilateral chest expansion and listen to both sides of the chest. endobronchial intubation (withdraw the endotracheal tube 2cm and reassess) or pneumothorax (check the heartrate and blood pressure, feel to see if the trachea is central and percuss the chest).
56 ManagementIf wheezes are present, consider bronchospasm, aspiration or pulmonary oedemaThe surgical procedure or the position of the patient may also make ventilation difficult
57 Pneumothorax A pneumothorax may occur for many reasons including : Insertion of intercostal nerve blocks orPlacing a central venous catheter.It can happen spontaneously or because of chest trauma or high ventilation pressure during general anesthesia.
58 Signs and SymptomsThe awake patient may complain of dyspnoea, chest pain, and be tachypnoeic and hypoxic.In the anaesthetized patient, it can be very difficult to diagnose a pneumothorax.The patient may be hypoxic and have raised inspiratory airway pressures. A large pneumothorax or a tension pneumothorax will cause hypotension, tachycardia and may cause death.
59 Signs and SymptomsOn examination the patient may have reduced or absent breath sounds on one side, increased resonance to percussion, tracheal deviation or subcutaneous emphysema.The anesthetist must always consider a pneumothorax in their diagnosis, especially if the patient is at increased risk(central venous catheter inserted, chest trauma, asthma, high airway pressure).
60 Signs and SymptomsA pneumothorax may be present with signs and symptoms similar to several other problems, including aspiration of gastric contents, endobronchial intubation, a blocked endotracheal tube and bronchospasm.An erect chest x-ray will help with the diagnosis (a pneumothorax can be very difficult to see on a supine chest x-ray).
62 ManagementAlways ensure that the patient is well oxygenated and ventilatingTurn off the nitrous oxide and give 100% oxygen (70% nitrous oxide will rapidly increase the size of a pneumothorax by 100% in 10 minutes).Check the blood pressure and pulse rate.
63 ManagementIf the blood pressure is low and there is no other cause for a low blood pressure, treat the patient as if they have a tension pneumothorax. A tension pneumothorax can rapidly cause death and must be treated as an emergency.Inform the surgeon and call for help.
64 ManagementInsert a large intravenous catheter into the pleural space to aspirate the pneumothorax.The intravenous catheter should be placed in the second intercostal space above the rib in line with the middle of the clavicle, to avoid damaging the intercostal nerves and blood vessels.A chest tube must be inserted following insertion of an intravenous catheter.