Match the following clinical scenarios of patients presenting with acute circulatory collapse to their most likely corresponding invasive hemodynamic profile (pulmonary capillary wedge pressure [PCWP], cardiac output [CO], systemic vascular resistance [SVR], and right atrial pressure [RAP]).
- A 26-year-old woman with a ruptured ectopic pregnancy and massive intra-abdominal hemorrhageDecreased PCWP, Decreased CO, Increased SVR
- A 70-year-old man with a massive anterior wall ST-elevation myocardial infarction and severe pulmonary edemaIncreased PCWP, Decreased CO, Increased SVR
- A 74-year-old woman with urosepsis, a fever of 39.4 C (103 F), and warm, flushed extremitiesDecreased PCWP, Increased CO, Decreased SVR
- A 58-year-old man with an acute massive saddle pulmonary embolism and clear lung fieldsNormal PCWP, Decreased CO, Increased SVR, Increased RAP
Answer
The clinical scenarios correctly map to their respective shock profiles as follows: Hemorrhage maps to hypovolemic shock (low PCWP, low CO, high SVR). Myocardial infarction maps to cardiogenic shock (high PCWP, low CO, high SVR). Sepsis maps to distributive shock (low PCWP, high CO, low SVR). Pulmonary embolism maps to obstructive shock (normal PCWP, low CO, high SVR, high RAP).
Each type of shock produces a distinct and predictable hemodynamic pattern reflecting its underlying pathophysiology. Hypovolemic shock is characterized by a primary deficit in preload (low PCWP). Cardiogenic shock is defined by primary pump failure causing fluid backup (high PCWP). Distributive shock is driven by primary pathological vasodilation (low SVR). Obstructive shock features a mechanical barrier that prevents blood from reaching the left ventricle, causing right-sided volume overload (high RAP) but preserving or lowering left-sided filling pressures (normal/low PCWP).
Step-by-Step Solution
Key Concept
Differentiation of the four primary categories of shock (hypovolemic, cardiogenic, distributive, and obstructive) using invasive hemodynamic parameters.
Estimated Time:1m 30s