Exam 1 - States of Shock Flashcards

1
Q

What is the classic definition for shock? (2)

A

hypotension as either an SBP <90 mmHg or a decrease in 40 mmHg from baseline

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2
Q

What is the formula for mean arterial pressure?

A

MAP = 1/3 SBP + 2/3 DBP

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3
Q

List factors affecting MAP? (2)

A

cardiac output, vascular resistance

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4
Q

List factors affecting cardiac output? (2)

A

heart rate, stroke volume

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5
Q

List factors affecting stroke volume? (3)

A

preload, afterload, contractility

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6
Q

What is the goal MAP? HR? Lactate?

A

MAP >65 mmHg; HR = <100 bpm; lactate <2 mmol/L

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7
Q

What is the goal venous blood gas for pulmonary artery catheters? Central venous catheters?

A

PA = >60%; CVC = >65%

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8
Q

List the shock states? (4)

A

hypovolemic, distributive, cardiogenic, obstructive

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9
Q

Define hypovolemic shock and list its causes?

A

inappropriately low and sudden loss of intravascular volume; hemorrhage, GI losses, severe dehydration, third spacing, burns

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10
Q

Match the clinical parameters associated with physical variables? (4)

A

preload = PCWP, pump function = CO, afterload = SVR, tissue perfusion = mixed venous oxygen saturation (SVO2)

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11
Q

Explain the changes during hypovolemic shock? (4)

A

decreased preload, decreased pump function, increased afterload, decreased tissue perfusion

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12
Q

What are treatments for hypovolemic shock? (3)

A

surgical hemostasis, replace blood (PRBCs, anticoagulation reversal), fluids (IV crystalloids, albumin)

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13
Q

Define cardiogenic shock and list its causes?

A

failure of left ventricle to deliver blood due to impaired stroke volume or heart rate; MI, arrhythmias, HF, valve diseases, dilated cardiomyopathy

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14
Q

Explain the changes during cardiogenic shock? (4)

A

increased preload, decreased pump function, increased afterload, decreased tissue perfusion

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15
Q

What are treatments for cardiogenic shock? (3)

A

revascularization for MI (CABG), correct arrhythmias, left ventricular assist devices (LVADs) and ECMO

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16
Q

Define distributive shock and list its causes?

A

characterized by pronounced vasodilation (vasodilatory shock); sepsis, anaphylaxis, neurogenic, myxedema coma, adrenal/hepatic insufficiency

17
Q

Explain the changes during distributive shock? (4)

A

decreased preload, variable pump function, decreased afterload, variable tissue perfusion

18
Q

Define obstructive shock and list its causes?

A

results from critical decrease in LV stroke volume or increase in LV outflow obstruction; PE, severe pulmonary HTN, tension pneumothorax, pericardial tamponade

19
Q

What are treatments for obstructive shock? (2)

A

needle decompression, fluid drainage

20
Q

Explain the changes during obstructive shock? (4)

A

increased preload, decreased pump function, increased afterload, decreased tissue perfusion

21
Q

What is the treatment for fluid therapy in shock therapy?

A

IV crystalloids 30 mL/kg over 15-30 min, then by 10 mL/kg boluses (if cardiogenic 100-200 mL boluses)

22
Q

What is the MOA of norepinephrine?

A

alpha adrenergic agonist (increases MAP via peripheral vasoconstriction)

23
Q

What is the MOA of epinephrine?

A

alpha and beta adrenergic agonist

24
Q

What are other important points regarding epinephrine? (2)

A

may increase aerobic lactate production, useful for anaphylactic shock

25
Q

What are AEs of epinephrine?

A

tachycardia, arrhythmias, cardiac ischemia, peripheral vasoconstriction, reduced renal blood flow, hyperglycemia, and hypokalemia

26
Q

Explain dopamine’s dose-dependent pharmacologic properties?

A

<5 mcg/kg/min = vasodilatory, 5-10 = beta-1 adrenergic effects (increased HR), >10 = alpha-1 adrenergic effects (vasoconstriction)

27
Q

What are AEs of dopamine?

A

tachycardia, arrhythmogenesis, peripheral vasoconstriction (high doses)

28
Q

What types of patients is dopamine most effective in?

A

those with hypotension and depressed cardiac function

29
Q

What is the MOA of phenylephrine?

A

alpha-1 adrenergic agonist

30
Q

Which types of patients is phenylephrine most effective in?

A

those with high cardiac output and low blood pressure

31
Q

What are AEs of phenylephrine?

A

vasoconstriction, bradycardia, myocardial ischemia

32
Q

Which types of patients is dobutamine most effective in?

A

those with cardiac output or SVO2/SCVO2 goals that have not been achieved with previous vasopressor therapy

33
Q

Which types of patients is vasopressin most effective in?

A

those with septic shock

34
Q

Which types of patients is angiotensin II (Giapreza) most effective in?

A

those with septic shock (or other distributive shocks)

35
Q

What is an AE of angiotensin II (Giapreza)?

A

thromboembolism