pediatric shock recognition / resuscitation · pediatric shock recognition / resuscitation edward...
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Pediatric ShockRecognition / Resuscitation
Edward J. Cullen Jr., D.O.Pediatric Critical Care Medicine
2003
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Shock
Oxygen Delivery can not support
Metabolic Demands of the Body
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Is the child in shock?
• Mental status, general appearance, response to stimulation (AVPU)
• Heart rate, central and distal pulse character
• Skin temperature, capillary refill, end organ function, blood pressure, urine output
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Decompensated Shock
• Neonate SBP< 60 mm Hg
• Infant SBP< 70 mm Hg
• Child SBP < 70 mm Hg + (2 x age in years)
• Child > 10 years of age: SBP< 90 mm Hg
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Acute Blood Loss
• 15% or less (Class I)
• 15-30% (Class II)
• 30-40% (Class III)
• >40 % (Class IV)
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Dehydration
• Mild: 4%-5% BW loss or 40-50 ml/kg fluid deficit
• Moderate: 6%-9% BW loss or 60-90 ml/kg fluid deficit
• Severe: >10%BW loss or 100-110 ml/kg fluid deficit
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Myocardial Dysfunction• Dyspnea, cough, tachypnea, wheeze, rales
• Tachycardia, gallop rhythm, hypotension
• Cyanosis, cold extremities, diaphoresis, weak peripheral pulses
• Edema, neck vein distention, hepatomegaly
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Sepsis
• Documented or suspected infection• Fever, hypothermia• Leukocytosis, leukopenia• Hypotension• Oliguria, coagulapathy• Prolonged capillary refill, mottling
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Septic Shock
• Cold or warm shock
• Fluid-refractory/dopamine resistant shock
• Catecholamine resistant shock
• Refractory shock
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Blood Pressure
Blood Pressure =
Cardiac Output x Systemic Vascular Resistance
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Cardiac Output
• Stroke volume x heart rate
• Stroke volume depends on – Preload– Contractility– Afterload
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Oxygen ContentCa02
• Hbg gm/dl x 1.36 x Sa02 + Pa02 x .003
– 1.36 is the estimate of mean volume of 02 that can be bound by 1 gram of normal hemoglobin when fully saturated
– .003 is the solubility coefficient of 02 in human plasma
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Oxygen Delivery
• Oxygen delivery= cardiac output x arterial 02 content (Ca02)
• Oxygen consumption = cardiac output x (Ca02-Cv02)
• Oxygen extraction = oxygen consumption / oxygen delivery
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Re-perfusion Injury
• Reperfusion of injured cells with oxygen =Superoxide anion radicals
• Microvascular disruption, inflammatory cascade, pro-coagulant, cytokine release
• Multiple organ system dysfunction
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Etiologies of Shock
• Insufficient cardiac filling
• Impaired ejection of blood
• Inadequate heart rate
• Increased demand for blood flow
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Insufficient Cardiac Filling
• Intravascular volume depletion
• Increased vascular capacity
• Impedance to venous return
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Impaired Ejection of Blood
• Impedance to outlfow– Obstructive lesions
• Decreased contractility– Cardiac
• Congenital• Acquired
– Non Cardiac
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Inadequate Heart Rate
• Disorder of pulse formation
• Disorder of impulse conduction
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Increased Demand for Blood Flow
• Reduced arterial oxygen saturations
• Impaired nutrient utilization
• Maldistribution of flow
• Increased metabolic demand
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Treatment for Shock
• Airway & C-spine stabilization• Breathing (Oxygenation / Ventilation)• Circulation (First 15 minutes)• Ongoing shock
– General – Specific insult
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Circulatory SupportThe First 15 Minutes
• Access (IO, peripheral or central IV)• Isotonic crystalloid solution 20ml/kg bolus• Control external hemorrhage• Chest compressions • AED • EKG• Treat THAID
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Fluids
• Isotonic crystalloid solution (normal saline or Ringer’s lactate), 20ml/kg fluid bolus IO/IV push over 5 minutes
• Isotonic crystalloid solution or colloid 20ml/kg fluid bolus IO/IV push over 5 minutes
• After the third fluid bolus, if suspected hemorrhage, PRBC 10-15 ml/kg or Whole blood 20 ml/kg
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AED
• Prehospital setting• Children > 8 yrs old, weight > 25 kg who
have sudden collapse cardiac arrest• Power ON the AED• Attach AED electrode pads to chest• Clear patient and analyze rhythm• If indicated, Clear patient, deliver Shock
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EKG
• Asystole and PEA• Ventricular tachycardia / filbrillation• Bradycardia (Heart rate < 60 and poor
systemic perfusion)• Tachycardia and poor perfusion
– Narrow Complex– Wide Complex
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Treat THAID
• Tension pneumothorax, Tamponade, Thromboembolism,Toxin,
• Hypoxemia, Hypovolemia,Hypothermia, H+ (metabolic, K,Ca,Mg,glucose), Head, Heart
• Adrenal insufficiency• Infection• Ductal dependent cardiac lesion
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Circulatory SupportOngoing Shock
• Maximize oxygen delivery to tissues• Cardiac output, Hemoglobin, 02 saturation
• Correct precipitating problem (THAID)• Address re-perfusion and inflammatory
injury• Provide multiple organ system support.
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Hemorrhage
• Continue Isotonic crystalloid solution / colloid / PRBC until surgical intervention has controlled internal bleeding and shock resolved
• Monitoring - consider central venous and urinary catheter
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Hypovolemia (fluid losses)
• Continue Isotonic crystalloid solution or colloid 20ml/kg fluid bolus IO/IV push over 5 to 20 minutes based on child’s clinical condition until shock is resolved.
• Monitoring - consider central venous and urinary catheter
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Myocardial Dysfunction
• Optimize preload:10 ml/kg boluses may be used and given slowly over 10-20 minutes
• Inotropes, vasodilators, inhaled NO• Maintain ductal opening if appropriate• Correct anatomic lesions, dysrythmias• IVIG / Steroids (myocarditis)• Ventricular Assist Device / ECMO
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Septic Shock
• Fluid Refractory Shock • Dopamine 10 mcg/kg/min IV• Establish central venous and arterial catheters for
monitoring
• Fluid refractory-dopamine resistant shock• Epinephrine 0.1 mcg/kg/minute IV and titrate for
cold shock • Norepinephrine 0.1 mcg/kg/minute IV and titrate for
warm shock
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Septic Shock
• Catecholamine-resistant shock • At risk of adrenal insufficiency?
• Give hydrocortisone• Stress coverage - Hydrocortisone 1-2 mg/kg IV• Shock coverage - Hydrocortisone 50 mg/kg IV
followed by same dose as a 24 hour infusion
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Septic Shock
• Normal BP, cold shock, SVC 02 Sat < 70%• Vasodilator & Volume loading
• Low BP, cold shock, SVC 02 sat < 70%• Epinephrine & volume loading
• Low BP, warm shock• Norepinephrine & volume loading • Vasopressin or angiotensin?
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Septic Shock
• Persistent Catecholamine-resistant shock– Direct fluid, inotropes, vasopressor, vasodilator
and hormonal (thyroid) therapies using pulmonary artery catheter to attain normal MAP-CVP and C.I. > 3.3 and < 6.0 L/min/m2
• Refractory Shock– Consider ECMO
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Is the child in shock?
• Mental status, general appearance, response to stimulation (AVPU)
• Heart rate, central and distal pulse character
• Skin temperature, capillary refill, end organ function, blood pressure, urine output
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Decompensated Shock
• Neonate SBP< 60 mm Hg
• Infant SBP< 70 mm Hg
• Child SBP < 70 mm Hg + (2 x age in years)
• Child > 10 years of age: SBP< 90 mm Hg
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Circulatory SupportThe First 15 Minutes
• Access (IO, peripheral or central IV)• Isotonic crystalloid solution 20ml/kg bolus• Control external hemorrhage• Chest compressions • AED • EKG• Treat THAID
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Fluids
• Isotonic crystalloid solution (normal saline or Ringer’s lactate), 20ml/kg fluid bolus IO/IV push over 5 minutes
• Isotonic crystalloid solution or colloid 20ml/kg fluid bolus IO/IV push over 5 minutes
• After the third fluid bolus, if suspected hemorrhage, PRBC 10-15 ml/kg or Whole blood 20 ml/kg
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Treat THAID
• Tension pneumothorax, Tamponade, Thromboembolism,Toxin,
• Hypoxemia, Hypovolemia,Hypothermia, H+ (metabolic, K,Ca,Mg,glucose), Head, Heart
• Adrenal insufficiency• Infection• Ductal dependent cardiac lesion
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Circulatory SupportOngoing Shock
• Maximize oxygen delivery to tissues• Cardiac output, Hemoglobin, 02 saturation
• Correct precipitating problem (THAID)• Address re-perfusion and inflammatory
injury• Provide multiple organ system support.
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Circulatory SupportOngoing Shock
• Consultation with pediatric critical care physician
• Consider transfer to a pediatric ICU, pediatric trauma center or primary trauma center with pediatric expertise.