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Program Information. SHOCK Classification and Approach to Management. Anand Kumar, MD. Section of Critical Care Medicine Section of Infectious Diseases University of Manitoba, Winnipeg, Canada UMDNJ-Robert Wood Johnson Medical School Cooper Hospital, NJ. Shock.

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  1. Program Information

  2. SHOCK Classification and Approach to Management Anand Kumar, MD Section of Critical Care Medicine Section of Infectious Diseases University of Manitoba, Winnipeg, Canada UMDNJ-Robert Wood Johnson Medical School Cooper Hospital, NJ

  3. Shock • Cardiogenic Shock -a major component of the mortality associated with cardiovascular disease • Hypovolemic Shock -the major contributor to early mortality from trauma • Septic Shock -most common cause of death in American ICUs

  4. Definition • Kumar and Parrillo (1995): “the state in which profound and widespread reduction of effective tissue perfusion leads first to reversible, and then if prolonged, to irreversible cellular injury”

  5. Shock: Classification • Hypovolemic Shock -due to decreased circulating blood volume • Cardiogenic Shock -due to cardiac pump failure related to loss of myocardial contractility/functional myocardium or structural/mechanical failure • Extra-cardiac Obstructive Shock -due to obstruction to flow in the cardiovascular circuit • Distributive Shock -caused by loss of vasomotor control

  6. CO SVR PWP EDV hypovolemic cardiogenic obstructive afterload preload distributive pre-resusc post-resusc Shock Hemodynamics

  7. Cardiogenic Extracardiac Obstructive Distributive Hypovolemic (e.g. Hemorrhage) (e.g. septic) (e.g. Myocardial infarction) Preload Diastolic filling (e.g. tension pneumothorax or pericardial tamponade) Ventricular afterload (e.g. massive pulmonary embolus) Myocardial depression Myocardial damage Preload Diastolic filling ( Diastolic filling) ( Systolic and Diastolic function) Systolic and diastolic function Diastolic function Systolic function SVR ( CO) CO ( SVR) CO = cardiac output; SVR = systemic vascular resistance; MAP = mean arterial blood pressure; MODS = multiple organ dysfunction syndrome. MAP Maldistribution of flow Shock Kumar and Parrillo, 2001 MODS Classification of Shock

  8. Hypovolemic Shock • degree of volume loss response • 10% well tolerated (tachycardia) • 20-25% failure of compensatory mechanisms (hypotension, orthostasis, decreased CO) • >40% loss associated with overt shock (marked hypotension, decreased CO, lactic acidemia)

  9. Hypovolemic Shock • rate of volume loss and pre-existing cardiac reserve response • acute 1 L blood loss results in mild to moderate hypotension with decreased CVP and PWP

  10. Cardiogenic Shock • #1 cause of in-hospital mortality from Q-wave MI • requires at least 40% loss of functional myocardium • usually involves left main or left anterior descending obstruction • historically, incidence of cardiogenic shock post-Q wave MI has run 8-20%with mortality 70-90%

  11. Cardiogenic Shock • mortality substantially better for cardiogenic shock due to surgically remediable lesions • aortic valve failure • papillary muscle rupture • ischemic form seen 3-7 days post-LAD territory infarct • v wave of > 10 mm often seen in PWP trace • VSD (post-infarct, rarely traumatic) • post-infarct seen 3-7 days post-LAD occlusion • 5-10% oxygen saturation step-up

  12. Obstructive Shock • rate of development of obstruction to blood flow response • acute, massive PE involving 2 or more lobar arteries and 40-50% pulmonary bed can cause shock • acute cardiac tamponade can occur with 150 mL fluid but over 2L can be well tolerated if slow accumulation • similar variability based on presence of pre-existing cardiopulmonary disease

  13. Distributive Shock • defining feature: loss of peripheral resistance • dominantly septic shock, anaphylactic and neurogenic shock less common • clinical form of shock with greatest contribution of other shock elements i.e., hypovolemia, cardiac failure

  14. Compensatory Responses to Shock • Maintain mean circulatory pressure • Volume • Fluid redistribution to vascular space • Decrease Renal losses • Pressure • Decreased venous capacitance Kumar and Parrillo, 2001

  15. Compensatory Responses to Shock • Maximize cardiac performance • Increase contractility • Redistribute perfusion • Optimize oxygen unloading Kumar and Parrillo, 2001

  16. hypovolemia myocardial dysfunction (e.g. MI)cardiovascular obstruction (e.g. massive PE) sepsis intravascularvolume venouscapacitance venous pressure cardiovascular stress renal perfusion circulatory shock ( MAP) stretch receptors baroreceptors aortic arch, carotid body right atrialpulmonary artery vascular chemoreceptors carotid, aorta sympathetic response hormonal medullary chemoreceptor renal juxtaglomerular apparatus epinepherinenorepinephrinerenin/angiotensinaldosterone CNS pituitary response ACTH/ADH neural cortisolaldosterone cardiac contractility vasoconstriction flow redistribution Kumar and Parrillo, 2001 Na/H2O retention cardiac contractility vasoconstriction flow redistribution Na retentionmaintain cardiovascular catecholamine responsiveness

  17. ORGAN SYSTEM DYSFUNCTION ORGAN SYSTEM MANIFESTATIONS CNSEncephalopathy (ischemic or septic) Cortical necrosis HeartTachycardia, bradycardia Supraventricular tachycardia Ventricular ectopy Myocardial ischemia Myocardial depression PulmonaryAcute respiratory failure Adult respiratory distress syndrome (ARDS) KidneyPrerenal failure Acute tubular necrosis GIIleus Erosive gastritis Pancreatitis Acalculous cholecystitis Colonic submucosal hemorrhage Transluminal translocation of acteria/endotoxin Kumar and Parrillo, 2001

  18. Organ System Dysfunction ORGAN SYSTEMMANIFESTATIONS LiverIschemic hepatitis “Shock” liver Intrahepatic cholestasis HematologicDisseminated intravascular coagulation Dilutional thrombocytopenia MetabolicHyperglycemia Glycogenolysis Gluconeogenesis Hypoglycemia (late) Hypertriglyceridemia Immune SystemGut barrier function depression Cellular immune depression Humoral immune depression Kumar and Parrillo, 2001

  19. Clinical Approach to Diagnosis and Management Shock Suspected • Hypotension • Tachycardia • Peripheral hypoperfusion • Oliguria • Encephalopathy THERAPEUTIC DIAGNOSTIC

  20. Diagnosis and Evaluation • Clinical Signs • primary diagnosis • differential Dx

  21. Diagnosis and Evaluation • Laboratory • Hgb, WBC, platelets • PT/PTT • Electrolytes, arterial blood gases • BUN, Cr • Ca, Mg • serum lactate • ECG

  22. Clinical Approach to Diagnosis and Management • Initial Diagnostic Steps • CXR • abdominal views* • CT scan abdomen or chest* • echocardiogram* • pulmonary perfusion scan*

  23. Diagnosis and Evaluation • Invasive Monitoring • arterial pressure catheter • CVP monitoring • ScvO2

  24. Clinical Approach to Diagnosis and Management • Admit to Intensive Care Unit (ICU) • Venous access • Central venous catheter • Arterial catheter • EKG monitoring • Pulse oximetry • Hemodynamic support (MAP <60 mmHg)

  25. Clinical Approach to Diagnosis and Management • Diagnosis Remains Undefined or Hemodynamic Status Requires Repeated Fluid Challenges of Vasopressors • Pulmonary Artery Catheterization • Echocardiography

  26. Diagnosis Using Pulmonary Artery Catheterization Pulmonary Artery Cardiac Miscellaneous Diagnosis Occlusion Pressure Output Comments Cardiogenic Shock Cardiogenic shockUsually occurs with due to myocardial evidence of extensive dysfunction myocardial infarction (40% of LV infarcted), severe cardiomyopathy, or myocarditis. Cardiogenic shock due to a mechanical defect Acute VSD LVCO Predominant shunt is and RVCO left to right, pulmonary >LVCOblood flow is greater than systemic blood flow: oxygen “step-up” occurs at RV level. Kumar and Parrillo, 2001

  27. Diagnosis Using Pulmonary Artery Catheterization Pulmonary Artery Cardiac Miscellaneous Diagnosis Occlusion Pressure Output Comments Cardiogenic Shock Acute mitral ForwardV waves in pulmonary regurgitation CO artery occlusion pressure tracing. Right ventricular Normal or Elevated RA and RV filling infarction pressures with low or normal pulmonary artery occlusion pressures. Extracardiac obstructive forms of shock PericardialorRA mean, RV end- tamponade diastolic, pulmonary artery occlusion mean pressures are elevated and within 5 mmHg of one another. Kumar and Parrillo, 2001

  28. Diagnosis Using Pulmonary Artery Catheterization Pulmonary Artery Cardiac Miscellaneous Diagnosis Occlusion Pressure Output Comments Extracardiac obstructive forms of shock Massive pulmonary Normal orUsual finding is embolism elevated right-sided pressures. Hypovolemic shock Distributive forms of shock Septic shockor normal or normal, Pre-resuscitation rarely  cardiac output is Anaphylactic or normal or normal decreased shock Kumar and Parrillo, 2001

  29. Clinical Approach to Diagnosis and Management Immediate Goals in Shock Hemodynamic support MAP >60mmHg PAOP = 12-18 mmHg Cardiac Index >2.2 L/min/m2Maintain oxygen delivery Hemoglobin >9 g/dL Arterial saturation >92% Supplemental oxygen and mechanical ventilationReversal of oxygen dysfunction Decreasing lactate (<2.2 mM/L) Maintain urine output Reverse encephalopathy Improving renal, liver function tests MAP = mean arterial pressure; PAOP = pulmonary artery occlusion pressure.

  30. Clinical Approach to Diagnosis and Management • Hypovolemic Shock • Rapid replacement of blood, colloid orcrystalloid • Identify source of blood or fluid loss

  31. Clinical Approach to Diagnosis and Management • Cardiogenic Shock • RV infarction • fluid and inotropes with PA catheter monitoring • Mechanical abnormality

  32. Results of Current Therapy Treatment In-hospital StrategyMortality Rate (%) Inotropic support 90 + Thrombolysis80-90 + IABP 80 + CABG50-60 + PTCA if successful50-60 if unsuccessful80-90 From Klein L. W.: Intra-aortic balloon pumping. In Parrillo J.E., Bone R.C. (eds), Critical Care Medicine: Principles of diagnosis and management, St. Louis, 1995: Mosby.

  33. Clinical Approach to Diagnosis and Management • Extracardiac Obstructive Shock • Pericardial tamponade

  34. Courtesy of David Hunter, MD University of Minnesota

  35. Clinical Approach to Diagnosis and Management • Distributive Shock • Septic shock - Identify site of infection and drain, if possible • Goals: • SV02 >70% • improving organ function • decreasing lactate levels

  36. Fluid Therapy • Crystalloids • Colloids • Packed red blood cells • Infuse to physiologic endpoints

  37. Relative Potency: Vasopressors/Inotropes CARDIAC PERIPHERAL VASCULAR Agent Dose Heart Contractility Vasoconstriction Vasodilation Dopaminergic Rate Dopamine1-4 (m/k)/min1+1+01+4+ 4-20 (mg/kg)/min2+2-3+2-3+02+ Norepi2-20 mg/min1+2+4+00 Dobutamine2-15 (mg/kg)/min 1-2+3-4+02+0 Isoproterenol 1-5 mg/min4+4+04+0 Epinephrine1-20 mg/min4+4+4+3+0 Phenylephrine20-200 mg/min003+00 Vasopressin0.01-0.04 u/min004+00 Milrinone37.5-75 mg/kg1+3+02+0 bolus; then 0.375- 0.75 ug/kg/min Kumar and Parrillo, 2001

  38. Conclusion • This concludes the presentation.

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