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    Ventilatormanagementindifferentdiseaseentities 100330220411-phpapp01(1) Ventilatormanagementindifferentdiseaseentities 100330220411-phpapp01(1) Presentation Transcript

    • Ventilator Managementin Different Disease Entities
    • Mechanical Ventilation Use of sophisticated life support technology aimed at maintaining tissue oxygenation and removal of carbon dioxide Support or replace the normal ventilatory pump in moving air into and out of the lungs – inadequate or absent spontaneous breathing
    • Mechanical Ventilation Not without risk – complications and hazards an be life threatening Decision to initiate mechanical ventilation  Serious one  Sound clinical judgment  Clear understanding of the indications and associated goals
    • Indications for Mechanical Ventilatory Support Respiratory failure  An inability of the heart and lungs to provide adequate tissue oxygenation or removal of carbon dioxide Acute respiratory failure  PaO2 < 60 mm Hg  SpO2 < 90%  With or without PaCO2 > 45 mm Hg
    • Acute Respiratory Failure Hypoxemic respiratory failure – lung failure Hypercapnic respiratory failure – pump failure  Acute ventilatory failure A sudden increase in PaCO2 with a corresponding decrease in pH  Chronic ventilatory failure  Elevated PaCO2 with a normal or near normal pH
    • Initial Ventilator Setup Key Decisions Indications for ventilatory support present Negative pressure versus positive pressure ventilation Non-invasive versus invasive positive pressure ventilation Type and method of establishment of an airway Pressure versus volume ventilation Partial or full ventilatory support Choice of ventilator Mode of ventilation  Assist-control ventilation versus SIMV (with or without pressure support)  Pressure support  Pressure control  Mixed or dual control modes  Other newer modes of adjuncts
    • Indications for Mechanical Ventilation in ARDS Hypoxemia  Application of PEEP  Delivery of high FiO2 Increased work of breathing  Use of ventilator to reduce work of breathing Impending or acute ventilatory failure  Maintenance of normal pH and/or PaCO2
    • Ventilator Settings for ALI or ARDS ARDSnet Approach  Maintaining a low tidal volume  Monitoring plateau pressure  Setting PEEP based on the FiO2 requirement
    • Lower Tidal Volume Ventilation Strategy NIH ARDS Network Calculate predicted body weight  Male :  PBW (kg) = 50 ± 2.3 [(height in inches)-60] = 50 ± 0.91[(height in cm) –152.4]  Female :  PBW (kg) = 45.5 ± 2.3 [(height in inches)-60] = 45.5 ± 0.91[(height in cm) –152.4] Ventilator mode : Volume assist/control until weaning
    • Lower Tidal Volume Ventilation Strategy NIH ARDS Network Tidal Volume(Vt)  Initial Vt : adjust Vt in steps of 1 ml/kg PBW every 1-2 hours until Vt = 6 ml/kg  Measure inspiratory plateau pressure (Pplat; 0.5 second inspiratory pause) every 4 hours and after each change in PEEP or Vt  If Pplat > 30 cm H2O, decrease Vt to 5 or 4 ml/kg  If Pplat < 25 cm H2O, and Vt,6ml/kg, increase Vt by 1 ml/kg PBW
    • Lower Tidal Volume Ventilation Strategy NIH ARDS Network Respiratory Rate (RR)  With initial change in Vt, adjust RR to maintain minute ventilation  Make subsequent adjustments to RR to maintain pH 7.30-7.45, but do not exceed RR = 35/min and do not increase set rate if PaCO2 <25 mm Hg I:E ratio : Acceptable range = 1:1 – 1:3 (no inverse ratio)
    • Lower Tidal Volume Ventilation Strategy NIH ARDS Network FiO2, PEEP and arterial oxygenation: Maintain PaO2 55-80 mm Hg or SpO2 88%-95% Use only the following PEEP/FiO2 combinations:  FiO2 PEEP (cm H2O)  0.3-0.4 5  0.4 8  0.5 8-10  0.6 10  0.7 10-14  0.8 14  0.9 16-18  1 18-25
    • Lower Tidal Volume Ventilation Strategy NIH ARDS Network  Acidosis management  If pH<7.30, increase RR until pH>1≧ 7.30 or RR=35/min  If pH remains <7.30 with RR = 35, consider bicarbonate infusion  If pH <7.15, Vt may be increased (Pplat may exceed 30 cm H2O)  Alkalosis management  If pH > 7.45 and patient not triggering ventilator, decrease set RR but not below 6/min
    • Lower Tidal Volume Ventilation Strategy NIH ARDS Network Weaning  Initiate weaning by pressure support when all of the following criteria are present:  FiO2 <0.4 and PEEP<8cm H2O  Not receiving neuromuscular blocking agents  Inspiratory efforts are apparent (ventilator rate may be decreased to 50%of baseline level for up to 5 minutes to detect inspiratory effort)  Systolic arterial pressure > 90 mm Hg without vasopressor support
    • Traditional Tidal Volume NIH ARDS Network Volume assist control Tidal Volume(Vt) : 12 ml/kg predicted body weight Plateau pressure : < 50 cm H2O Ventilator rate setting needed to achieve a pH goal of 7.3-7.45 : 6-35 breath/min I;E ratio : 1:1 – 1:3
    • Patients Excluded in NIH ARDS Network Study 36 hours had elapsed since they met the first three criteria Younger than 18 years of age Participated in other trials within 30 days before the three criteria were met Pregnant Neuromuscular disease that impair spontaneous breathing Sickle cell disease Severe chronic respiratory disease
    • Patients Excluded in NIH ARDS Network Study Weighed more than 1 kg per centimeter of height Burns over more than 30 percent of their BSA Other conditions with an estimated 6-month mortality rate > 50% Undergone bone marrow or lung transplantation Chronic liver disease (as defined by Child-Pugh class C) Their attending physician refused or unwilling to dull life support
    • Respiratory Values during the First 7 days in NIH ARDS Network StudyVariable Day 1 Day 3 Day 7 LVT TVT LVT TVT LVT TVTTidal volume 6.2±0.9 11.8±0.8 6.2±1.1 11.8±0.8 6.5±1.4 11.4±1.4Plateau pressure 25±7 33±9 26±7 34±9 26±7 37±9Peak insp pressure 32±8 39±10 33±9 40±10 33±9 44±10Mean aw pressure 17±13 17±12 17±14 19±17 17±14 20±10RR 29±7 16±6 30±7 17±7 30±7 20±7Minute ventilation 12.9±3.6 12.6±4.5 13.4±3.5 13.4±4.8 13.7±3.8 14.9±5.3PEEP 9.4±3.6 8.6±3.6 9.2±3.6 8.6±4.2 8.1±3.4 9.1±4.2
    • Main Outcome Variables in NIH ARDS Network Lower VT Traditional VT P ValueDeath before discharge home 31.0 39.8 0.007 and breathing without assistance (%)Weaning by day 28 (%) 65.7 55.0 <0.001No. of ventilator-free days, 12 ± 11 10 ± 11 0.007 days 1 to 28Barotrauma, days 1 to 28 (%) 10 11 0.43No. of days without failure 15 ± 11 12 ± 11 0.006 of non-pulmonary organs or systems, days 1 to 28
    • Clinical Trials of Traditional Versus Lower Tidal Volume Ventilation Strategies in Acute Lung Injury and Acute Respiratory Distress Syndrome Number of Tidal Volumes Tidal Volumes Mortality Patients as Reported per kg PBW (%) Randomized T L T L T LStewart et al 120 10.8+ 7.2+ 12.2 8.1 47 50Brochard et al 116 10.3 7.1 11.3 7.8 38 47Brower et al 52 10.2 7.3 10.2 7.3 46 50ARDS Network 861 11.8 6.2 11.8 6.2 40 31
    • Evidence-Based MedicineIn Mechanical Ventilation in ARDS The ARDS network trial provided strong evidence that a lower tidal volume strategy can improve clinical outcomes in patients with ALI or ARDS
    • Summary of Alternative Ventilator Strategies for ALI/ARDSVentilatory No. ofStrategy Year How Studies Patients Comments StudyLow tidal 1999 Phase III 861 Mortality was reduced by ARDS volume 22% with a 6 ml/kg Network predicted body weight tidal volume. This is the first large randomized multicenter controlled trial to show a mortality benefit from a specific therapy in ALI/ARDSLow tidal 2002 Phase III 549 There was no mortality ARDS volume with benefit to increase levels Network high PEEP of PEEP compared with the standard ARDS Network
    • Higher versus Lower Positive End-ExpiratoryPressures in Patients with the Acute Respiratory Distress Syndrome ARDS Network NEJM 2002
    • Methods October 1999-February 2002 23 hospitals of the National Heart, Lung, and Blood Institute (NHLBI) ARDS Clinical Trials Network
    • Patient Intubation with MV due to  a sudden decrease in the ratio of the PaO2/FiO2≦ 300  a recent appearance of bilateral pulmonary infiltrates consistent with the presence of edema  no clinical evidence of left atrial hypertension (defined by PAWP≦18 mmHg)
    • Criteria of exclusion <13 y/o participated in other trials involving ALI within the preceding 30 days; Pregnant; IICP severe neuromuscular disease, sickle cell disease, severe chronic respiratory disease,
    • Criteria of exclusion BW> 1 kg/cm, Burns> 40 % BSA, Severe chronic liver disease, Vasculitis with diffuse alveolar hemorrhage, A coexisting condition associated with an estimated 6-month mortality rate >50 %; Post- BMT or lung transplant; Their attending physician refused to allow enrollment.
    • Figure 1. Probabilities of Survival and of Discharge Home WhileBreathing without Assistance, from the Day of Randomization (Day 0) toDay 60 among Patients with Acute Lung Injury and ARDS, According toWhether Patients Received Lower or Higher Levels of PEEP.
    • Evidence-Based MedicineIn Mechanical Ventilation in ARDS with Higher PEEP The ARDS Network higher versus lower PEEP trial provided strong evidence that there was no mortality benefit to increase levels of PEEP compared with the standard ARDS Network low tidal volume strategy
    • Algorithm for ventilator management of ARDS using the ARDSnet protocol START Calculate predicted body weight CMV (A/C). VCV. Set initial volume to 8 mL/kg, then 7 mL/kg after 1 hr, then 6 mL/kg after next hr. increase respiratory rate to maintain minute ventilation. I:E ratio 1:2. PEEP and FiO2 per FiO2/PEEP table no no ↓VT to Pplat < ↑VT by 1 mL/kg VT 4 mL/kg 4 mL/kg 30 cm H2O yes yes yes Pplat < yes VT < 6 mL/kg 25 cm H2O no no yes ↑VT to 7-8 mL/kg Severe dyspnea no PaO2 55-80 no Adjust FiO2 or PEEP SpO2 88-95 per FiO2/PEEP table yes ↑rate yes pH< FiO2≦0.4 no Consider HCO3 pH ↓rate 7.15 <7.30 PEEP=8 ↑VT >7.45 no yes ↑rate 7.30-7.45 Evaluate for weaning ARDS Network N Engl J Med 2000; 342:1301
    • Indications for Mechanical Ventilation in Patients with Chronic Pulmonary Disease Acute on chronic ventilatory failure and hypoxemia  Elevated PaCO2 and resulting hypoxemia Unloading work-of-breathing  Increased work-of-breathing due to increased resistance Resting ventilatory muscles  Exhausted muscles Improving bronchial hygiene  Increased airway secretions
    • Ventilator Strategy in Chronic Pulmonary Obstructive Disease Primary concern : patient-ventilator synchrony  To avoid unnecessary work of breathing  To reduce anxiety  To decrease ventilatory drive  To minimize auto-PEEP
    • Algorithm for the ventilator management of the patient with COPDSTART Candidate yes yes yes yes Patient Clinically Continue For NPPV tolerates improved NPPV NPPV intubate intubate intubate (A/C), PCV or VCV, VT 8-10 mL/kg, Pplat < 30 cm H2O, rate 10/min, Ti 0.6-1.2 s, PEEP 5 cm H2O, FiO2 for SpO2 90-95% <55 PaO2 >75 ↑ FiO2 mmHg ↓ FiO2 55-75 mmHg no Pplat > Pplat < no 30 cm H2O pH 25 cm H2O >7.45 <7.30 yes yes ↓rate ↓VT 7.30-7.45 ↑VT ↑rate no Auto-PEEP yes no Clear secretions Auto-PEEP Administer bronchodilators yes Fumeaux T et al Intensive Care Med 2001;27:1868 Gladwin MT et al Intensive Care Med 1998;24:898 ↑PEEP if missed trigger efforts Nava S et al Ann Intern Med 1998; 128:721 ↓VT or rate
    • Indications for Mechanical Ventilation in Patients with Chest Trauma Flail chest with paradoxical chest movement, tachypnea, hypoxemia, hypercarbia Pulmonary contusion with tachypnea and severe hypoxemia (PaO2< 60 mmHg) breathing 100% O2 Rib fracture with chest pain requiring large dose of narcotics for pain control Post-operative thoracotomy Hemodynamic instability, particularly with marginal respiratory reserve (hypoxemia and tachypnea) Severe associated injuries ( head injury)
    • Ventilator Strategy in Patients with Chest Trauma Full ventilatory support initially Sedation, or paralysis may be necessary initially Barotrauma is common Tidal volume  8-10 ml/kg with satisfactory lung compliance  4-8 ml/kg with pulmonary contusion and ARDS
    • Algorithm for Mechanical Ventilation of the Patient with Chest Trauma START CMV (A/C), VT 6 to 10 mL/kg, FiO2 1.0. rate 15/min, Ti 1 s, VCV or PCV, PEEP 5 cm H2O Titrate FiO2 to SpO2 92-95% Good lung down yes FiO2 no Broncho- no no Pleural ICP Unilateral <0.6 fistula >20 disease ↑PEEP no yes yes yes ↑FiO2 yes Pplat> ↓VT and ↑rate 30 cm H2O no >7.45 <7.30 >25 ↓rate pH Pplat ↑rate 7.30-7,45 ≦25 Maintain ↑VT or Current ↑rate Calhoon JH et al Chest Surg Clin N Am 1997;7:199 settings Ferguson M et al 1996 2:449 Gentilello LM et al Am J Respir Crit Care Med 2001 163:604
    • Indications for Mechanical Ventilation in Patients with Acute Head Injury Depression due to primary neurologic injury Associated injuries to the spine, chest and abdomen Neurogenic pulmonary edema Treatment with respiratory suppressant medications (barbiturate, sedatives, paralysis)
    • Algorithm for Mechanical Ventilation of the Patient with Head Injury START CMV (A/C), PCV or VCV, CMV (A/C), PCV or VCV, VT 4 t0 8 mL/kg.FiO2 1.0, yes Unilateral lung no VT 8 t0 12 mL/kg.FiO2 1.0, rate 20/min, Ti 1 s, disease rate 20/min, Ti 1 s, PEEP 5 cm H2O PEEP 5 cm H2O Titrate FiO2 for SpO2 ≧92% no ↑rate PaCO2 Pplat > 30 ↓rate >45 <35 yes 35 - 45 ↓VT no FiO2 <70 >100 >0.6 PaO2 ↓FiO2 yes 70 - 100 no ICP< yes FiO2 More aggressive ↑FiO2 Medical therapy 20 >0.6 yes no >20 ↑PEEP <20 >20 ICP ↑rate ICP <20 Maintain Slowly ↓rate to initial ventilator setting settings Berrouschot J et al Crit Care Med 2000 28:2956
    • Management of Intracranial Pressure Hyperventilation : PaCO2 of 25- 30 mmHg Mean airway pressure : kept as low as possible Positioning : 30° elevation of the head Dehydration and osmotherapy : manitol and lasix Sedation and paralysis : agitation, cough Barbiturate therapy Temperature control Ventriculostomy
    • Indications for Mechanical Ventilation in Post-operative Patients  Apnea – unreversed anesthetic agents  Iatrogenic hypothermia  Need to reduce cardiopulmonary stress  Presence of altered pulmonary mechanics  Transplant recipients  Minimize post-operative cardiopulmonary stress  Pre-existing lung disease compromising cardiopulmonary reserve
    • Algorithm for Mechanical Ventilation of the Post-operative Patient Prior lung yes Ventilate consistent START disease with underlying disease no Single lung yes Ventilate consistent transplant with negative lung pathology no CMV (A/C), VCV or PCV, VT 10 – 12 mL/kg, rate 12/min, I;E:1:3 PEEP 5 cm H2O, FiO2:1.0 Titrate FiO2 For SpO2> 92% FiO2 ↑PEEP ≧0.6 <0.6 Adjust rate and tidal volume for normal acid-base Consider extubation yes Spontaneous Breathing efforts. Spontaneous no yes breathing Tolerated no Hemodunamically Stable, FiO2≦0.5 trial PEEP≦5
    • Initial Ventilator Settings for Postoperative Patients with no Prior Disease Setting Recommendation Mode A/C (CMV) Rate 10 - 16/min Volume/pressure control Pressure or volume Tidal volume 10-12 mL/kg IBW and plateau pressure <30 cm H2O Inspiratory time 1s PEEP ≤ 5 cm H2O FiO2 Sufficient to maintain PaO2 > 80 mm Hg Flow waveform Descending ramp
    • Initial Ventilator Settings for PostoperativePatients with Prior Obstructive Lung DiseaseSetting RecommendationMode A/C (CMV)Rate 8 – 12 /minVolume/pressure control Pressure or volumeTidal volume 8-10 mL/kg IBW and plateau pressure <30 cm H2OInspiratory time 0.6 – 1.2 sPEEP 5 cm H2O; counterbalance auto-PEEP FiO2 Sufficient to maintain PaO2 > 60 mm HgFlow waveform Descending ramp
    • Initial Ventilator Settings for PostoperativePatients with Prior Restrictive Lung Disease Setting Recommendation Mode A/C (CMV) Rate 15 –25 /min Volume/pressure control Pressure or volume Tidal volume < 8 mL/kg IBW and plateau pressure <30 cm H2O Inspiratory time 1 s PEEP 5 cm H2O FiO2 Sufficient to maintain PaO2 > 60 mm Hg Flow waveform Descending ramp
    • Respiratory Failure in NeuromuscularDiseases and Chest Wall Deformities Rapid onset  Myasthenia gravis  Guillain-Barre syndrome  High spinal cord injury  Prolonged paralysis following use of neuromuscular blocking agents in ICU Gradual onset  Muscular dystrophy  Amyotrophic lateral sclerosis  Thoracic deformities (severe scoliosis, kyphosis, kyphoscoliosis)  Post-polio syndrome
    • Indications for Mechanical Ventilation in Patients with Neuromuscular Disease  Progressive ventilatory failure  Acute ventilatory failure  Oxygenation is not usually an issue – except in patients with acquired critical illness neuromusculopathy following prolonged mechanical ventilation
    • Algorithm for Mechanical Ventilation of the Patient with Neuromuscular Disease without Lung Disease START CMV (A/C), VCV, VT 15 mL/kg, FiO2 0.40 Rate 10/min, Ti 1 s, PEEP 0 cm H2O no yes no Secretions <92% >95% SpO2 SpO2 ↑FiO2 <95% ↑PEEP or ↓FiO2 atelectasis yes 92-95% In-Exsufflattor yes yes ↑VT dyspnea ↑rate dyspnea no no ↓rate or ↓VT ≦25 <7.35 >7.45 Consider ↑VT Pplat pH mechanical >25 dead space 7.35-7.45 ↑rate no secretions yes In-Exsufflattor Maintain therapy
    • Methods to Treat Atelectasis In-exsufflator Maximal insufflation capacity  Hyperinflation Assisted cough  Peak cough flow > 160 L/min
    • Mechanical Insufflation-Exsufflation  Artificial cough machine  Stimulating cough by inflating the lung with pressure, followed by a negative pressure to produce a high expiratory flow  Inspiratory pressure :25-35 cm H2O for 1-2 seconds  Expiratory pressure:-40 cm H2O for 1-2 seconds  Treatment periods: 5-6 breaths
    • Indications for Mechanical Ventilation in Patients with Cardiovascular Failure  Increased work of the myocardium  Decrease myocardial work with MV  Increased work of breathing  Reduce the work of breathing with MV  Hypoxemia  Reverse hypoxemia with MV
    • Algorithm for Mechanical ventilation of the Patient with Cardiac Failure Awake and yes no Mask CPAP,START Acute MI 5-10 cm H2O, FiO2 1.0 cooperative no intubate yes CMV (A/C), VCV or PCV, VT 8-10 no Patient intubate tolerates mL/kg, Pplat < 30 cm H2O, I;E:1:2 PEEP 5 cm H2O, FiO2 1.0 yes PaCO2> no yes SpO2<92%; 45 mm Hg ↑PEEP Pulmonary edema yes no NPPV Titrate FiO2 For SpO2>92% yes PaCO2. no ≧30 45 mm Hg ↓VT Pplat <30 >7.45 <7.35 ↓ rate pH ↑ rate 7.35-7.45 Hemodynamic Continue therapy, Manipulate no yes stability Definitive medical therapy PEEP and FiO2 Bersten AD et al New Engl J Med 1991 325:1825 Poppas A et al Am J Respir Crit Care Med 2002 165:4
    • Indications for Mechanical Ventilation in Patients with Asthma  Acute ventilatory failure  Impending acute ventilatory failure  Severe hypoxemia
    • Ventilator Strategy in Patients with Acute Asthma Major concern: auto-PEEP  To minimize auto-PEEP  Permissive hypercapnia  Use of inhaled bronchodilators and systemic steroids to reduce the airway inflammation, edema, swelling and bronchospasm  Risk of barotrauma and hypotension
    • Algorithm for Mechanical Ventilation of Patient with Asthma START CMV (A/C), PCV or VCV, VT 4-8 mL/kg, Pplat≦ 30 cm H2O rate 8-20/min, Ti 1 s, PEEP 5 cm H2O, FiO2 1.0 >95% <92% ↓FiO2 SpO2 ↑FiO2 92-95% no Pplat> >7.45 <7.30 Pplat< no 30 cm H2O pH 25 cm H2O yes yes ↓rate 7.30-7.45 ↓VT ↑VT ↑rate no Auto-PEEP yesno Auto-PEEP Administer bronchodilators Afzal M et al Clin Rev Allergy Immunol 2001 20:385 yes Mansel JK et al Am J Med 1990 89:42 Decrease minute ventilation Koh Y Int Aneshesiol Clin 2001 39:63
    • Indications for Mechanical Ventilation in Patients with Burn and Smoke Inhalation Smoke inhalation or pulmonary burn with respiratory failure (ARDS) Severe burn with chest wall restriction Respiratory depression due to inhalation of systemic toxin (carbon monoxide) Respiratory failure due to secondary infection – pneumonia, sepsis Postoperative skin graft or escharotomy
    • Algorithm for Mechanical Ventilation of Patient with Burn and Inhalation InjurySTART CMV (A/C), PCV or VCV, yes Continue CO poisoning VT 6 to 12 mL/kg, FiO2 1.0, 100% O2 rate 15/min, Ti 1 s no Titrate FiO2 for SpO2≧92% ABG results Treat with: <7.30 Bronchodilators, no >7.45 diuretics ↓ rate Pplat>30 pH yes ↓ VT 7.30-7.45 Pplat>30 no ↑ VT Cm H2O yes FiO2< <70 >100 ↑ FiO2 PaO2 yes 0.6 no 70-100 ↓Chest wall yes Consider compliance VT ↑ Consider: no FiO2< ↓ FiO2 Bronchodilators 0.6 no Diuretics Secretion clearance ↑ rate yes PEEP Recruitment maneuver Maintain Prone ventilator Inhaled nitric oxide settings
    • Indications for Mechanical Ventilation in Patients with Bronchopleural Fistula Bronchopleural fistula is not by itself an indication for mechanical ventilation, but may be necessary in the following settings:  Apnea  Acuteventilatory failure  Impending acute ventilatory failure  Oxygen deficit
    • Algorithm for Mechanical Ventilation of Patient with Bronchopleural Fistula Start CMV (A/C), VCV or PCV, rate 6-20/min VT 4 – 8 mL/kg, Ti≤ 1 s PEEP 3 cm H2O, FiO2:1.0 Exhaled VT yes >75% Inhaled VT no Systemicaly evaluate changes in: Tidal volume Respiratory Rate Titrate FiO2 for PEEP SpO2 92-95% Inspiratory time Pressure control vs. volume control <7.25 >7.45 rate pH rate 7.25-7.45
    • Indications for Mechanical Ventilation in Patients with Drug Overdose  Apnea  Acute respiratory failure  Impending acute respiratory failure
    • Algorithm for Mechanical Ventilation of Patient with Drug Overdose START CMV (A/C), VCV or PCV,,rate 10/min VT 8 to 12 mL/kg, Ti 1 s, PEEP 5 cm H2O, FiO2 1.0 Titrate FiO2 for SpO2 > 92% ≧0.60 FiO2 ↑PEEP <0.60 Adjust rate and tidal volume for normal acid-base Consider extubation yes Spontaneous no breathing efforts yes Spontaneous hemodynamically no Breathing tolerated stable, FiO2≦0.5 trial PEEP≦5
    • 謝謝 !如有問題請發問 !
    • Ventilator Setting for ALI or ARDS Open Lung Approach Maintaining a low plateau pressure Monitoring tidal volume Using recruitment maneuvers and high levels of PEEP to maximize alveolar recruiment
    • Algorithm for ventilator management of ARDS using the open lung approach CMV (A/C). PCV to achieve VT of 4-8 mL/kg, START Ti to Avoid auto-PEEP. Rate 20/min. FiO2 1.0. PEEP 10 cm H2O Recruitment maneuver PEEP 20 cm H2O FiO2 to maintain SpO2 90-95% Decrease PEEP to maintain SpO2 90-95% <7.25 >7.45 ↓pressure control ↑ pressure control if pH Pplat < 30 cm H2O ↓ rate ↑rate (avoid auto-PEEP) Consider accepting lower pH 7.25-7.45 Recruitment maneuver <90% >95% ↓FiO2 ↑ increase PEEP SpO2 ↓ PEEP if FiO2 < 0.05 ↑increase FiO2 90-95% ≧90% SpO2 Maintain ventilator settings <90% Consider prone position Consider accepting lower level of oxygenation Consider inhaled nitric oxide Amato MBP et al. N Engl J Med 1998 338:347
    • The ARDSnet protocol for ventilation of patients with ALI and ARDS Initial ventilator tidal volume and rate adjustment  Calculate predicted body weight  Male = 50 + 2.3 [ht (in) – 60 ] kg  Female = 45.5 + 2.3 [ht (in) – 60 ] kg  Mode : volume Assist-Control  Set initial tidal volume to 8 mL/kg PBW  Reduce tidal volume to 7 mL/kg PBW after 1-2 hrs and then to 6 mL/kg PBW after a further 1-2 hrs  Set initial ventilator rate to maintain baseline minute ventilation (not > 35 /min) ARDS Network N Engl J Med 2000; 342:1301
    • The ARDSnet protocol for ventilation of patients with ALI and ARDS Subsequent tidal volume adjustments  Plateau pressure goal : ≤ 30 cm H2O  Check inspiratory plateau pressure (Pplat) with 0.5 s pause at least every 4 hrs and after each change in PEEP and tidal volume  If Pplat >30 cm H2O, decrease tidal volume by 1 mL/kg PBW, if necessary to 4 mL/kg PBW  If Pplat < 25 cm H2O and tidal volume < 6 mL/kg PBW, increase tidal volume by 1 mL/kg PBW until Pplat >25 cm H2O and tidal volume =6 mL/kg  If breath stacking or severe dyspnea occurs, tidal volume may be increased (not required) to 7 or 8 mL/kg PBW 1f Pplat < 25 cm remains ≤ 30 cm H2O ARDS Network N Engl J Med 2000; 342:1301
    • The ARDSnet protocol for ventilation of patients with ALI and ARDS  Arterial oxygenation  Goal : PaO2 55-80 mm Hg or SpO2 88 – 95%  Use these FiO2/PEEP combinations to achieve oxygenation goalFiO2 - 0.3 0.4 0.4 0.5 0.5 0.6 0.7 0.7 0.7 0.8 0.9 0.9 0.9 1.0PEEP 5 5 8 8 10 10 10 12 14 14 16 16 18 20-24 ARDS Network N Engl J Med 2000; 342:1301
    • Figure 1. Probabilities of Survival and of Discharge Home WhileBreathing without Assistance, from the Day of Randomization (Day 0) toDay 60 among Patients with Acute Lung Injury and ARDS, According toWhether Patients Received Lower or Higher Levels of PEEP.
    • The ARDSnet protocol for ventilation of patients with ALI and ARDS Respiratory rate and arterial pH Arterial pH Goal : 7.30 – 7.45 A. Acidosis management  If pH 7.15 – 7.30  Increase set rate until pH >7.30 or PaCO2 < 25 (max rate = 35/min)  If set rate = 35 /min and pH < 7.30, NaHCO3 may be given (not required)  If pH < 7.15  Increase set respiratory rate to 35 /min  If set rate = 35 /min and pH < 7.15 and NaHCO3 has been considered, tidal volume may be increased in 1 mL/kg PBW steps until pH > 7.15 (Pplat target may be exceeded) Alkalosis management  Decrease set rate until patient rate > set rate. Minimum set rate = 6 /min I:E Ratio Goal : 1:1 – 1:3  Adjust flow and inspiratory flow waveform to achieve goal ARDS Network N Engl J Med 2000; 342:1301
    • Recruitment Maneuvers In the first 80 patients, higher-PEEP group, => assessed the safety and efficacy of recruitment maneuvers single sustained inflations of the lungs to higher airway pressures and volumes than are obtained during tidal ventilation An effort to improve arterial oxygenation.
    • Recruitment Maneuvers One or two such maneuvers were conducted during the first four days, by applying CPAP 35 to 40 cmH2O for 30 seconds. The subsequent mean increase in arterial oxygenation was small and transient. Discontinued recruitment maneuvers for the remainder of the trial.
    • General Guideline for Initial Ventilator Settings for Adult Patients Tidal Volume  8 to 12 mL/kg IBW  Avoid over-distension  Prefer volume on the steep part of the pressure-volume curve  Maintain Pplat at 30 cm H2O or less  10-12 mL/kg IBW is a good starting point for most of the patients  12 – 15 mL/kg IBW –neuromuscular diseases or post- operative patients with normal lungs  8-10 mL/kg IBW in SIMV with adequate expiratory time  In ARDS patients, start with 8 mL/kg, reduce gradually to 6 mL/kg to maintain Pplat at 30 cm H2O or less
    • Alarm and Backup Ventilation Settings for Initial Ventilator Setup (Adult)Low pressure 8 cm H2O 0r 5-10 cm H2O below PIPLow PEEP/CPAP 3-5 cm H2O below PEEPHigh pressure limit 50 cm H2O adjust to 10-20 cmH2O above PIPLow exhaled tidal volume 100 mL or 10-15% below set VTLow exhaled minute ventilation 2-5 L/min or 10-15% below backup minute ventilationHigh minute ventilation 5 L/min or 10-15% above baseline minute ventilationOxygen percentage 5% above and below set O2 %Temperature 2°C above and below set temperature High temperature not to exceed 37°CApnea delay 20 secondsApnea values Tidal volume and rate set to achieve full ventilatory support with 100 % O2