Presentation on theme: "RESPIRATORY FAILURE and ARDS BY NANCY JENKINS. Exchange of O2 and CO2 gas exchange gas exchange."— Presentation transcript:
RESPIRATORY FAILURE and ARDS BY NANCY JENKINS
Exchange of O2 and CO2 gas exchange gas exchange
For normal functioning
Respiratory Failure the inability of the cardiac and pulmonary systems to maintain an adequate exchange of oxygen and CO2 in the lungs
Acute Respiratory Failure n Hypoxemia- inadequate O2 transfer PaO2 of 60mmHg or less when pt. Receiving 60% or greater O2PaO2 of 60mmHg or less when pt. Receiving 60% or greater O2 Hypercapnia- insufficient CO2 removal Increases PaCO2
Inhaling Affects PaO2 Exhaling Affects PCO2
Hypoxemic Respiratory Failure- (Affects the pO2) n V/Q Mismatch n Shunt n Diffusion Limitation n Alveolar Hypoventilation- inc. CO2 and dec. PO2
Range of V/Q Relationships Fig. 68-4
VentilationPerfusion Mismatch (V/Q) n Normal V/Q =1 (1ml air/ 1ml of blood) n Ventilation=lungs n Perfusion or Q=perfusion n Pulmonary Embolus- (VQ scan) pulmonary embolism pulmonary embolism
Shunt n 2 Types 1. Anatomic- passes through an anatomic channel of the heart and does not pass through the lungs ex: ventricular septal defect1. Anatomic- passes through an anatomic channel of the heart and does not pass through the lungs ex: ventricular septal defect 2. Intrapulmonary shunt- blood flows through pulmonary capillaries without participating in gas exchange ex: alveoli filled with fluid2. Intrapulmonary shunt- blood flows through pulmonary capillaries without participating in gas exchange ex: alveoli filled with fluid * Patients with shunts are more hypoxemic than those with VQ mismatch and they may require mechanical ventilators* Patients with shunts are more hypoxemic than those with VQ mismatch and they may require mechanical ventilators
Diffusion Limitations n Gas exchange is compromised by a process that thickens or destroys the membrane 1. Pulmonary fibrosis1. Pulmonary fibrosis 2. ARDS2. ARDS * A classic sign of diffusion limitation is hypoxemia during exercise but not at rest
Diffusion Limitation Fig. 68-5
Alveolar Hypoventilation n Mainly due to hypercapnic respiratory failure but can cause hypoxemia n Increased pCO2 with decreased PO2 n Restrictive lung disease n CNS diseases n Neuromuscular diseases
Hypercapnic Respiratory Failure Ventilatory Failure- affects CO2 n 1. Abnormalities of the airways and alveoli- air flow obstruction and air trapping Asthma, COPD, and cystic fibrosisAsthma, COPD, and cystic fibrosis 2. Abnormalities of the CNS- suppresses drive to breathe drug OD, narcotics, head injury, spinal cord injury
Hypercapnic Respiratory Failure n 3. Abnormalities of the chest wall Flail chest, morbid obesity, kyphoscoliosisFlail chest, morbid obesity, kyphoscoliosis 4. Neuromuscular Conditions- respiratory muscles are weakened: Guillain-Barre, muscular dystrophy, myasthenia gravis and multiple sclerosis
Tissue Oxygen needs n Tissue O2 delivery is determined by: Amount of O2 in hemoglobinAmount of O2 in hemoglobin Cardiac outputCardiac output *Respiratory failure places patient at more risk if cardiac problems or anemia*Respiratory failure places patient at more risk if cardiac problems or anemia
Signs and Symptoms of Respiratory Failure- ABG’s n hypoxemia pO2<50-60 n May be hypercapnia pCO2>50 only one cause- hypoventilationonly one cause- hypoventilation *In patients with COPD watch for acute drop in pO2 and O2 sats along with inc. C02 and KNOW BASELINE!!!
Hypoxemia n Compensatory Mechanisms- early Tachycardia- more O2 to tissuesTachycardia- more O2 to tissues Hypertension- fight or flightHypertension- fight or flight Tachypnea –take in more O2Tachypnea –take in more O2 n Restlessness and apprehension n Dyspnea n Cyanosis n Confusion and impaired judgment n **Later dysrhythmias and metabolic acidosis, dec. B/P and Dec. CO.
Hypercapnia n Dyspnea to respiratory depression- if too high CO2 narcosis n Headache-vasodilation- Increases ICP n Papilledema n Tachycardia and inc. B/P n Drowsiness and coma n Respiratory acidosis **Administering O2 may eliminate drive to breathe especially with COPD patients- WHY??**Administering O2 may eliminate drive to breathe especially with COPD patients- WHY??
Specific Clinical Manifestations n Respirations- depth and rate n Patient position- tripod position n Pursed lip breathing n Orthopnea n Inspiratory to expiratory ratio (normal 1:2) n Retractions and use of accessory muscles n Breath sounds
Diagnosis n Physical Assessment n Pulse oximetry (90% is PaO2 of 60) n ABG n CXR n CBC n Electrolytes n EKG n Sputum and blood cultures, UA n V/Q scan if ?pulmonary embolus n Pulmonary function tests (PFT’s)
Exhaled C02 (ETC02) normal Used when trying to wean patient from a ventilator
Treatment Goals n O2 therapy n Mobilization of secretions n Positive pressure ventilation(PPV)
O2 Therapy n If secondary to V/Q mismatch- 1-3Ln/c or 24%-32% by mask n If secondary to intrapulmonary shunt- positive pressure ventilation-PPV May be via ET tubeMay be via ET tube Tight fitting maskTight fitting mask **Goal is PaO2 of with SaO2 at 90% or more at lowest O2 concentration possible**Goal is PaO2 of with SaO2 at 90% or more at lowest O2 concentration possible **O2 at high concentrations for longer than 48 hours causes O2 toxicity**O2 at high concentrations for longer than 48 hours causes O2 toxicity
Mobilization of secretions n Effective coughing- quad cough, huff cough, staged cough n Positioning- HOB 45 degrees or recliner chair or bed “Good lung down”“Good lung down” n Hydration - fluid intake 2-3 L/day n Humidification- aerosol treatments- mucolytic agents n Chest PT- postural drainage, percussion and vibration n Airway suctioning
Positive Pressure Ventilation n Invasively through oro or nasotracheal intubation n Noninvasively( NIPPV) through mask Used for acute and chronic resp failureUsed for acute and chronic resp failure BiPAP- different levels of pressure for inspiration and expiration- (IPAP) higher for inspiration,(EPAP) lower for expirationBiPAP- different levels of pressure for inspiration and expiration- (IPAP) higher for inspiration,(EPAP) lower for expiration CPAP- for sleep apneaCPAP- for sleep apnea **Used best in chronic resp failure in patients with chest wall and neuromuscular disease, also with HF and COPD.**Used best in chronic resp failure in patients with chest wall and neuromuscular disease, also with HF and COPD.
Should hear equal breath sounds if in correct place. Always get a CXR to check placement also
Endotracheal Tube Fig
Surgical Intervention- Tracheostomy Surgical Intervention- Tracheostomy Tracheotomy Surgical procedure performed when need for an artificial airway is expected to be long term If tube in greater than 4-5 days, perform a trach
Drug Therapy n Relief of bronchospasm- bronchodilators alupent and albuterol-(Watch for what side effect?)alupent and albuterol-(Watch for what side effect?) n Reduction of airway inflammation- Corticosteroids by inhalation or IV or po n Reduction of pulmonary congestion-diuretics and nitroglycerine with heart failure- why HF with pulmonary problems?why HF with pulmonary problems? n Treatment of pulmonary infections- IV antibiotics, vancomycin and rocephin n Reduction of anxiety, pain and agitation- diprivan, ativan, versed, propofol, opioids n May need sedation or neuromuscular blocking agent if on ventilator.(Norcuron, nimbex) assess with peripheral nerve stim.
Medical Supportive Treatment n Treat underlying cause n Maintain adequate cardiac output- monitor B/P and MAP. n Maintain adequate Hemoglobin concentration- need 9g/dl or greater **Need B/P of 90 systolic and MAP of 60 to maintain perfusion to the vital organs**Need B/P of 90 systolic and MAP of 60 to maintain perfusion to the vital organs
Nutrition n During acute phase- enteral or parenteral nutrition n In a hypermetabolic state- need more calories If retain CO2- avoid high carb dietIf retain CO2- avoid high carb diet
Acute Respiratory Failure Gerontologic Considerations n Physiologic aging results in ↓ Ventilatory capacity↓ Ventilatory capacity Alveolar dilationAlveolar dilation Larger air spacesLarger air spaces Loss of surface areaLoss of surface area Diminished elastic recoilDiminished elastic recoil Decreased respiratory muscle strengthDecreased respiratory muscle strength ↓ Chest wall compliance↓ Chest wall compliance **Dec. PO2 and inc. CO2**Dec. PO2 and inc. CO2
ARDS Also known as DAD (diffuse alveolar disease) or ALI (acute lung injury) a variety of acute and diffuse infiltrative lesions which cause severe refractory arterial hypoxemia and life-threatening arrhythmias
Memory Jogger n A ssault to the pulmonary system n R espiratory distress n D ecreased lung compliance n S evere respiratory failure
150,000 adults dev. ARDS About 50% survive **Patients with gram negative septic shock and ARDS have mortality rate of 70-90%
Direct Causes (Inflammatory process is involved in all) n Pneumonia* n Aspiration of gastric contents* n Pulmonary contusion n Near drowning n Inhalation injury
Indirect Causes ( Inflammatory process is involved) Sepsis* (most common) gm - n Severe trauma with shock state that requires multiple blood transfusions* n Drug overdose n Acute pancreatitis
*Causes (see notes) DIFFUSE lung injury (SIRS or MODS) Damage to alveolar capillary membrane Pulmonary capillary leak Interstitial & alveolar edema Inactivation of surfactant Alveolar atalectasis ↓CO Metabolic acidosis ↑CO Severe & refractory hypoxemia Hypoventilation Hypercapnea Respiratory Acidosis Hyperventilation Hypocapnea Respiratory Alkalosis SHUNTING Stiff lungs
Pathophysiology of ARDS n Damage to alveolar-capillary membrane n Increased capillary hydrostatic pressure n Decreased colloidal osmotic pressure n Interstitial edema n Alveolar edema or pulmonary edema n Loss of surfactant
What does surfactant do?
Pathophysiologic Stages in ARDS n Injury or Exudative- 1-7 days Interstitial and alveolar edema and atelectasisInterstitial and alveolar edema and atelectasis Refractory hypoxemia and stiff lungsRefractory hypoxemia and stiff lungs n Reparative or Proliferative-1-2 weeks after Dense fibrous tissue, increased PVR and pulmonary hypertension occursDense fibrous tissue, increased PVR and pulmonary hypertension occurs n Fibrotic-2-3 week after Diffuse scarring and fibrosis, decreased surface area, decreased compliance and pulmonary hypertensionDiffuse scarring and fibrosis, decreased surface area, decreased compliance and pulmonary hypertension
The essential disturbances of ARDS **interstitial and alveolar edema and atelectasis
**Progressive arterial hypoxemia in spite of inc. O2 is hallmark of ARDS
Clinical Manifestations: Early n Dyspnea-(almost always present), tachypnea, cough, restlessness n Chest auscultation may be normal or reveal fine, scattered crackles n ABGs **Mild hypoxemia and respiratory alkalosis caused by hyperventilation**Mild hypoxemia and respiratory alkalosis caused by hyperventilation
Clinical Manifestations: Early n Chest x-ray may be normal or show minimal scattered interstitial infiltrates Edema may not show until 30% increase in lung fluid contentEdema may not show until 30% increase in lung fluid content
Clinical Manifestations: Late n Symptoms worsen with progression of fluid accumulation and decreased lung compliance n Pulmonary function tests reveal decreased compliance and lung volume n Evident discomfort and increased WOB
Clinical Manifestations: Late n Suprasternal retractions n Tachycardia, diaphoresis, changes in sensorium with decreased mentation, cyanosis, and pallor n Hypoxemia and a PaO 2 /FIO 2 ratio <200 despite increased FIO 2 ( ex: 80/.8=100)
Clinical Manifestations n As ARDS progresses, profound respiratory distress requires endotracheal intubation and positive pressure ventilation n Chest x-ray termed whiteout or white lung because of consolidation and widespread infiltrates throughout lungs
Chest X-Ray of ARDS Fig
Clinical Manifestations n If prompt therapy not initiated, severe hypoxemia, hypercapnia, and metabolic acidosis may ensue
Nursing Diagnoses n Ineffective airway clearance n Ineffective breathing pattern n Risk for fluid volume imbalance n Anxiety n Impaired gas exchange n Imbalanced nutrition: Less than body requirements
Planning n Following recovery PaO 2 within normal limits or at baselinePaO 2 within normal limits or at baseline SaO 2 > 90%SaO 2 > 90% Patent airwayPatent airway Clear lungs or auscultationClear lungs or auscultation
Dyspnea and Tachypnea The Auscultation Assistant - Breath Sounds
Nursing Assessment n Lung sounds n ABG’s n CXR n Capillary refill n Neuro assessment n Vital signs n O2 sats n Hemodynamic monitoring values
Diagnostic Tests n ABG-review n CXR n Pulmonary Function Tests- dec. compliance and dec vital capacity- (max exhaled after max inhale) n Hemodynamic Monitoring- (Pulmonary artery pressures) to rule out pulmonary edema
ABG Review and Practice ABG Review and Practice RealNurseEd (Education for Real Nurses by a Real Nurse) RealNurseEd (Education for Real Nurses by a Real Nurse) ABG review
X-RAY on Autopsy
*Goal of Treatment for ARDS Maintain adequate ventilation and respirations. Prevent injury Manage anxiety
Treatment n Mechanical Ventilation-goal PO2>60 and 02 sat 90% with FIO2 60 and 02 sat 90% with FIO2 < 50 n PEEP- can cause dec. CO, B/P and barotrauma n Positioning- prone, continuous lateral rotation therapy and kinetic therapy n Hemodynamic Monitoring- fluid replacement or diuretics n Enteral or Parenteral Feeding- high calorie, high fat. Research shows that formulas enriched with omega -3 fatty acids may improve the outcomes of those with ARDS
Cont. n Crystalloids versus colloids n Mild fluid restriction and diuretics
PEEP pt. can not expire completely. Causes alveoli to remain inflated (Complications can include decreased cardiac output, pneumothorax, and increased intracranial pressure). (Complications can include decreased cardiac output, pneumothorax, and increased intracranial pressure). YouTube - Peep YouTube - Peep
FRC- air in after normal exhalation
PEEP ( Positive end-expiratory pressure)
Proning n Proning typically reserved for refractory hypoxemia not responding to other therapies Plan for immediate repositioning for cardiopulmonary resuscitationPlan for immediate repositioning for cardiopulmonary resuscitation
Proning-Principles n Positioning strategies Mediastinal and heart contents place more pressure on lungs when in supine position than when in proneMediastinal and heart contents place more pressure on lungs when in supine position than when in prone –Predisposes to atelectasis Turn from supine to prone positionTurn from supine to prone position –May be sufficient to reduce inspired O 2 or PEEP Fluid pools in dependent regions of lungFluid pools in dependent regions of lung
Prone Device Prone positioning With position change to prone, previously nondependent air-filled alveoli become dependent, perfusion becomes greater to air-filled alveoli opposed to previously fluid-filled dependent alveoli, thereby improving ventilation-perfusion matching. No benefit in mortality
Benefits to Proning Before proning ABG on 100%O2 7.28/70/70 After proning ABG on 100% 7.37/56/227
Positioning n Other positioning strategies Kinetic therapyKinetic therapy Continuous lateral rotation therapyContinuous lateral rotation therapy
Continuous Lateral Rotation Fig
Oxygen Therapy n Oxygen High flow systems used to maximize O 2 deliveryHigh flow systems used to maximize O 2 delivery SaO 2 continuously monitored, Usually have arterial line for frequent ABG’sSaO 2 continuously monitored, Usually have arterial line for frequent ABG’s Give lowest concentration that results in PaO 2 60 mm Hg or greaterGive lowest concentration that results in PaO 2 60 mm Hg or greater
Respiratory Therapy n Risk for O 2 toxicity increases when FIO 2 exceeds 60% for more than 48 hours Patients will commonly need intubation with mechanical ventilation because PaO 2 cannot be maintained at acceptable levelsPatients will commonly need intubation with mechanical ventilation because PaO 2 cannot be maintained at acceptable levels
Mechanical ventilation n PEEP Higher levels of PEEP are often needed to maintain PaO 2 at 60 mm Hg or greaterHigher levels of PEEP are often needed to maintain PaO 2 at 60 mm Hg or greater **High levels of PEEP can compromise venous return**High levels of PEEP can compromise venous return –↓ Preload, CO, and BP
Medical Supportive Therapy n Maintenance of cardiac output and tissue perfusion Continuous hemodynamic monitoringContinuous hemodynamic monitoring Continuous BP measurement via arterial catheterContinuous BP measurement via arterial catheter
Medical Supportive Therapy n Pulmonary artery catheter to monitor pulmonary artery pressure, pulmonary artery wedge pressures, and CO Administration of crystalloid fluids or colloid fluids, or lower PEEP if CO fallsAdministration of crystalloid fluids or colloid fluids, or lower PEEP if CO falls
Medical Supportive Therapy n Use of inotropic drugs may be necessary n Hemoglobin usually kept at levels greater than 9 or 10 with SaO 2 ≥90% n Packed RBCs n Maintenance of fluid balance
Medical Supportive Therapy n May be volume depleted and prone to hypotension and decreased CO from mechanical ventilation and PEEP n Monitor PAWP, daily weights, and I and O’s to assess fluid status
Medications n Inhaled Nitric Oxide n Surfactant therapy n NSAIDS and n corticosteroids
Case Study Case Study Assignments Case Study Assignments Case Study: Case Study:
Assessment Data and Priority n Respiratory rate of 10 n Absent breath sounds on the left n O2 sat 82% n High pressure alarm on vent going off n Bilateral wheezing n Respiratory rate of 30 n ABG respiratory acidosis
ARDS Prioritization and Critical Thinking Questions #28 n When assessing a 22 Y/o client admitted 3 days ago with pulmonary contusions after an MVA, the nurse finds shallow respirations at a rate of 38. The client states he feels dizzy and scared. O2 sat is 80% on 6 Ln/c. which action is most appropriate? n A.Inc. flow rate of O2 to 10 L/min and reassess in 10 min. n B.Assist client to use IS and splint chest using a pillow as he coughs. n C.Adminster ordered MSO4 to client to dec. anxiety and reduce hyperventilation. n D.Place client on non-rebreather mask at % FiO2 and call the Dr.
n #25.The nursing assistant is taking VS for an intubated client after being suctioned by RT. Which VS should be immediately reported to the RN? n A. HR 98 n B.RR 24 n C.B/P 168/90 n D.Temp 101.4
n #15. After change of shift report, you are assigned to care of the following clients. Which should be assessed first? 68 y/o on ventilator who needs a sterile sputum specimen sent to the lab. 59y/o with COPD and has a pulse ox on previous shift of 90%. 72y/o with pneumonia who needs to be started on IV antibiotics. 51y/o with asthma c/o shortness of breath after using his bronchodilator inhaler.
Ventilators song Ventilate me song Ventilate me
Ventilator a machine that moves air in and out of the lungs VentWorld - What is a Ventilator? VentWorld - What is a Ventilator?
Mechanical Ventilation n Indications Apnea or impending inability to breatheApnea or impending inability to breathe Acute respiratory failureAcute respiratory failure Severe hypoxiaSevere hypoxia Respiratory muscle fatigueRespiratory muscle fatigue
Mechanical Vent Objective support circulation and maintain pt. respirations until can breathe on own
Goal of Mechanical Ventilation n adequate controlled ventilation n relief of hypoxia without hypercapnia n relief of work of breathing n access to airways
Criteria to put on vent n Apnea or impending inability to breathe n Acute respiratory failure pH<7.25pH<7.25 pCO2>50pCO2>50 n Severe hypoxia - pO2<50 n Respiratory muscle fatigue
Mechanical Ventilation n Types of mechanical ventilation Negative pressure ventilationNegative pressure ventilation –Uses chambers that encase chest or body and surround it with intermittent subatmospheric or negative pressure –Noninvasive ventilation that does not require an artificial airway –Not used extensively for acutely ill patients –Mostly used for neuromuscular diseases, CNS and injuries of the spinal cord
Mechanical Ventilation n Types of mechanical ventilation (cont’d) Positive pressure ventilation (PPV)Positive pressure ventilation (PPV) –Used primarily in acutely ill patients –Pushes air into lungs under positive pressure during inspiration –Expiration occurs passively
Patient Receiving PPV Fig
Settings to Monitor Settings to Monitor n FIO2 -% of O2 n TV-<5ml/kg for ARDS (normal 8-10) n Rate Control (CMV) Continuous Mandatory VentilationControl (CMV) Continuous Mandatory Ventilation assist controlassist control SIMVSIMV n inspiratory pressure and flow n Pressure support- only in spontaneous breathes (gets the balloon started) Pt. controls all but pressure limit
Ventilator Modes- depends on WOB Mode refers to how the machine will ventilate the patient in relation to the patient’s own respiratory efforts. There is a mode for nearly every patient situation, plus many can be used in conjunction with each other.
Mechanical Ventilation n Modes of volume ventilation Based on how much work of breathing (WOB) patient should or can performBased on how much work of breathing (WOB) patient should or can perform Determined by patient’s ventilatory status, respiratory drive, and ABGsDetermined by patient’s ventilatory status, respiratory drive, and ABGs
Control Mode or CMV 1.TV and RR are fixed. 2.Used for patients who are unable to initiate a breath (anesthetized or paralyzed). CMV delivers the preset volume or pressure at pre-set rate regardless of the patient’s own inspiratory effort 3.Spontaneously breathing patients must be sedated and/or pharmacologically paralyzed so they don’t breathe out of synchrony with the ventilator. 3.*Ventilator does all the work
Assist Contol 1. A/C delivers the preset volume or pressure in response to the patient’s own inspiratory effort, but will initiate the breath if the patient does not do so within the set amount of time. 2. Patient Assists or triggers the vent –can breathe faster but not slower 3. Vent has back-up rate 4.May need to be sedated to limit the number of spontaneous breaths since hyperventilation can occur. 5. This mode is used for patients who can initiate a breath but who have weakened respiratory muscles.
Synchronous Intermittent Mandatory Ventilation-SIMV 1. SIMV delivers the preset volume or pressure and rate while allowing the patient to breathe spontaneously in between ventilator breaths. 2. Each ventilator breath is delivered in synchrony with the patient’s breaths, yet the patient is allowed to completely control the spontaneous breaths at own TV. 3. SIMV is used as a primary mode of ventilation, as well as a weaning mode. 4.During weaning, the preset rate is gradually reduced, allowing the patient to slowly regain breathing on their own. 5.The disadvantage of this mode is that it may increase the work of breathing and respiratory muscle fatigue
Pressure Support Ventilation 1.PSV is preset pressure that augments the patient’s spontaneous inspiratory effort and decreases the work of breathing. 2.The patient completely controls the respiratory rate and tidal volume. 3.PSV is used for patients with a stable respiratory status and is often used with SIMV to overcome the resistance of breathing through ventilator circuits and tubing.
High Frequency Ventilation 1. HFV delivers a small amount of gas at a rapid rate (as much as breaths per minute.) 2. This is used when conventional mechanical ventilation would compromise hemodynamic stability, during short-term procedures, or for patients who are at high risk for pneumothorax. 3. Sedation and pharmacological paralysis are required.
Inverse Ratio Ventilation 1.The normal inspiratory:expiratory ratio is 1:2 but this is reversed during IRV to 2:1 or greater (the maximum is 4:1). 2.This mode is used for patients who are still hypoxic even with the use of PEEP. The longer inspiratory time increases the amount of air in the lungs at the end of expiration (the functional residual capacity) and improves oxygenation by re-expanding collapsed alveoli- acts like PEEP. 3.The shorter expiratory time prevents the alveoli from collapsing again. 4.Sedation and pharmacological paralysis are required since it’s very uncomfortable for the patient. 5. For patients with ARDS continuing refractory hypoxemia despite high levels of PEEP
Case Study Mr. Hill has been on the ventilator for 24 hours. You volunteered to care for him today, since you know him from the intubation yesterday. The settings ordered by the pulmonologist after intubation were as follows: A/C, rate 14, VT 700, FIO2 60%. Since 0700, Mr. Hill has been assisting the ventilator with a respiratory rate of 24 (It’s now 1100) Describe the ventilator settings.
Answer The ventilator delivers 14 breaths per minute, each with a tidal volume of 700 ml. The A/C mode delivers the breaths in response to Mr. Hill’s own respiratory effort, but will initiate the breath if he doesn’t within the set amount of time. (He’s currently breathing above the vent setting.) The oxygen concentration is 60%.
Case Study You notice that Mr. Hill’s pulse oximetry has been consistently documented as 100% since intubation. You also notice that his respiratory rate is quite high and that he’s fidgety, doesn’t follow commands, and doesn’t maintain eye contact when you talk to him. He hasn’t had any sedation since he was intubated Which lab test should you check to find out what his true ventilatory status is?
Answer Arterial blood gas (ABG) - which he should have had done with his morning labs. If not, check with the pulmonologist about getting one.
Case Study 3. Which two parameters on the ABG will give you a quick overview of Mr. Hill’s status?
Answer PaCO2 (which affects the pH) and PaO2. With his high respiratory rate, Mr. Hill is at risk for hypocapnia from “blowing off CO2.” If the PaO2 is adequate, the FIO2 could be decreased, since his oxygen saturation has been consistently 100%.
Case Study 4. What are some possible causes of Mr. Hill’s increased respiratory rate? (Give the corresponding nursing interventions as well.)
Answer 1. Secretions - suction through the ETT, as well as his mouth. 1. Secretions - suction through the ETT, as well as his mouth. 2. Anxiety or pain - Mr. Hill hasn’t received any sedation since he was intubated. At this point, he should at least have a prn order for sedation, if not a continuous IV infusion. 3. The vent settings may not be appropriate – check the ABG’s and notify the pulmonologist
Case Study Mr. Hill didn’t have an ABG done this morning, so you get an order from the pulmonologist to get one now (1130). When it comes back, the PaCO2 is 28, the pH is 7.48, and the PaO2 is 120 (normals: PaCO mm Hg, pH mm Hg, PaO mm Hg). 5. Based on the ABG, the pulmonologist changes the vent settings to SIMV, rate 10, PS 10, FIO2 40%. The VT remains 700. How will these new settings help Mr. Hill?
Answer SIMV will deliver 10 breaths with the full tidal volume each minute, but in synchrony with Mr. Hill’s spontaneous breaths. This mode is not triggered to deliver a breath each time Mr. Hill inhales, and the tidal volume of his spontaneous breaths is under his control. Pressure support decreases the work of breathing that results from breathing through the ventilator circuits and tubing. The PaO2 was higher than desired, indicating that the FIO2 could be decreased. We need to be careful to prevent oxygen toxicity. The pulmonologist also orders midazolam (Versed) 1-2 mg every hour prn for sedation.
Alarms n high pressure n low pressure
Low Pressure Alarms Circuit leaks Airway leaks Chest tube leaks Patient disconnection High Pressure Alarms Patient coughing Secretions or mucus in the airway Patient biting tube Airway problems Reduced lung compliance (eg. pneumothorax) Patient fighting the ventilator Accumulation of water in the circuit Kinking in the circuit
NEVER TURN ALARMS OFF!
Assess your patient not the alarms
Mechanical Ventilation n Complications of PPV (cont’d) Cardiovascular system (cont’d)Cardiovascular system (cont’d) –↑ Intrathoracic pressure compresses thoracic vessels ↓ Venous return to heart, ↓ left ventricular end- diastolic volume (preload), ↓ cardiac output↓ Venous return to heart, ↓ left ventricular end- diastolic volume (preload), ↓ cardiac output HypotensionHypotension Mean airway pressure is further ↑ if PEEP >5 cm H 2 OMean airway pressure is further ↑ if PEEP >5 cm H 2 O
Mechanical Ventilation n Complications of PPV (cont’d) Pulmonary systemPulmonary system –Barotrauma Air can escape into pleural space from alveoli or interstitium, accumulate, and become trapped pneumothorax, subcutaneous emphysemaAir can escape into pleural space from alveoli or interstitium, accumulate, and become trapped pneumothorax, subcutaneous emphysema Patients with compliant lungs are at ↑ riskPatients with compliant lungs are at ↑ risk Chest tubes may be placed prophylacticallyChest tubes may be placed prophylactically
Mechanical Ventilation n Complications of PPV (cont’d) Ventilator-associated pneumonia (VAP)Ventilator-associated pneumonia (VAP) –Pneumonia that occurs 48 hours or more after ET intubation –Clinical evidence Fever and/or elevated white blood cell countFever and/or elevated white blood cell count Purulent or odorous sputumPurulent or odorous sputum Crackles or rhonchi on auscultationCrackles or rhonchi on auscultation Pulmonary infiltrates on chest x-rayPulmonary infiltrates on chest x-ray
Mechanical Ventilation n Complications of PPV (cont’d) Guidelines to prevent VAPGuidelines to prevent VAP –HOB elevation at least 30 to 45 degrees unless medically contraindicated –No routine changes of ventilator circuit tubing
Mechanical Ventilation n Complications of PPV (cont’d) Guidelines to prevent VAP (cont’d)Guidelines to prevent VAP (cont’d) –Use of an ET that allows continuous suctioning of secretions in subglottic area –Drain condensation that collects in ventilator tubing
Mechanical Ventilation n Complications of PPV (cont’d) Fluid retentionFluid retention –Occurs after 48 to 72 hours of PPV, especially PPV with PEEP –May be due to ↓ cardiac output –Results Diminished renal perfusionDiminished renal perfusion Release of renin-angiotensin-aldosteroneRelease of renin-angiotensin-aldosterone –Leads to sodium and water retention
Mechanical Ventilation n Complications of PPV (cont’d) Fluid retention (cont’d)Fluid retention (cont’d) –Pressure changes within thorax are associated with ↓ release of atrial natriuretic peptide, also causing sodium retention –As part of the stress response, antidiuretic hormone and cortisol may be ↑ Contributes to sodium and water retentionContributes to sodium and water retention
Mechanical Ventilation n Complications of PPV (cont’d) Gastrointestinal systemGastrointestinal system –Risk for stress ulcers and GI bleeding –↑ Risk of translocation of GI bacteria ↓ Cardiac output may contribute to gut ischemia↓ Cardiac output may contribute to gut ischemia –Peptic ulcer prophylaxis Histamine (H 2 )-receptor blockers, proton pump inhibitors, tube feedingsHistamine (H 2 )-receptor blockers, proton pump inhibitors, tube feedings –↓ Gastric acidity, ↓ risk of stress ulcer/hemorrhage
Mechanical Ventilation n Complications of PPV (cont’d) Musculoskeletal systemMusculoskeletal system –Maintain muscle strength and prevent problems associated with immobility –Progressive ambulation of patients receiving long-term PPV can be attained without interruption of mechanical ventilation
Mechanical Ventilation n Psychosocial needs Physical and emotional stress due to inability to speak, eat, move, or breathe normallyPhysical and emotional stress due to inability to speak, eat, move, or breathe normally Pain, fear, and anxiety related to tubes/ machinesPain, fear, and anxiety related to tubes/ machines Ordinary ADLs are complicated or impossibleOrdinary ADLs are complicated or impossible
Mechanical Ventilation n Psychosocial needs (cont’d) Involve patients in decision makingInvolve patients in decision making Encourage hope and build trusting relationships with patient and familyEncourage hope and build trusting relationships with patient and family Provide sedation and/or analgesia to facilitate optimal ventilationProvide sedation and/or analgesia to facilitate optimal ventilation
Mechanical Ventilation n Psychosocial needs (cont’d) If necessary, provide paralysis to achieve more effective synchrony with ventilator and increase oxygenationIf necessary, provide paralysis to achieve more effective synchrony with ventilator and increase oxygenation Paralyzed patient can hear, see, think, feelParalyzed patient can hear, see, think, feel –Sedation and analgesia must always be administered concurrently
Respiratory Therapy n Alternative modes of mechanical ventilation if hypoxemia persists Pressure support ventilationPressure support ventilation Pressure release ventilationPressure release ventilation Pressure control ventilationPressure control ventilation Inverse ratio ventilationInverse ratio ventilation High-frequency ventilationHigh-frequency ventilation Permissive hypercapniaPermissive hypercapnia Independent Lung VentilationIndependent Lung Ventilation
Independent Lung Ventilation
Research n LiquiVent is an oxygen-carrying liquid drug (perflubron) used for respiratory distress syndrome. n The goal of "liquid ventilation" therapy is to open up collapsed alveoli (air sacs) and facilitate the exchange of respiratory gases while protecting the lungs from the harmful effects of conventional mechanical ventilation.
Liquid Ventilation n Partial liquid ventilation with perflubron Perflubron is an inert, biocompatible, clear, odorless liquid that has affinity for O 2 and CO 2 and surfactant-like qualitiesPerflubron is an inert, biocompatible, clear, odorless liquid that has affinity for O 2 and CO 2 and surfactant-like qualities Trickled down ET tube into lungsTrickled down ET tube into lungs
Blood drains by gravity from the patient through a tube (catheter) placed in a large neck vein. This blood passes through a plastic pouch, or bladder, and then in pumped through the membrane oxygenator that serves as an artificial lung, putting oxygen into the blood and removing carbon dioxide. The blood then passes through a heat exchanger that maintains the blood at normal body temperature. Finally, the blood reenters the body through a large catheter placed in an artery in the neck.
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Prioritization and Delegation Questions on Vent n The nurse is assigned to provide nursing care for a client receiving mechanical ventilation. Which action should be delegated to the experienced nursing assistant? n A. Assess respiratory status q 4 hours. n B. Take VS and pulse ox reading q4 hours. n C. Check ventilator settings to make sure they are as prescribed. n D.Observe client’s need for suctioning q 2 hours.
n #27 The high pressure alarm on the vent goes off and when you enter the room to assess a client with ARDS, her O2 sat is 87% and she is struggling to sit up. What action should be taken next? n A. Reassure client that the vent will do the work of breathing for her. n B. Manually ventilate the client while assessing possible reasons for the alarm. n C. Inc. the FiO2 to 100% in preparation for endotracheal suction. n D. Insert an oral airway to prevent client from biting the endotracheal tube.