Hemodynamic Patterns of Shock | Medicalalgorithms.com

The pattern of hemodynamic changes in a patient with shock may indicate the underlying pathogenic mechanism.

Parameters:

(1) blood pressure

(2) cardiac output

(3) pulmonary capillary wedge pressure (PCWP)

(4) systemic vascular resistance (SVR)

Blood Pressure	Cardiac Output	PCWP	SVR	Shock Pattern
decreased	decreased	decreased	increased	hypovolemic
decreased	decreased	increased	increased	cardiogenic
decreased or normal	decreased or normal	increased or normal	increased or normal	obstructive, cardiac tamponade
decreased	decreased	normal or decreased	increased	obstructive, massive pulmonary embolism
decreased	increased	decreased	decreased	distributive

where:

• Decreased systemic vascular resistance indicates vasodilation.

• Increased systemic vascular resistance indicates vasoconstriction.

Parameter	Normal Range
systolic blood pressure	100 – 140 mm Hg
cardiac output	>= 5 liters per minute
pulmonary capillary wedge pressure	3 – 12 mm Hg
systemic vascular resistance	800 – 1,200 dyne•sec•cm^(-5)

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