What are the two varieties of shock?

What are the two varieties of shock?

• A. Hypovolemic and septic
• B. Cardiogenic and anaphylactic
• C. Obstructive and distributive
• D. Low cardiac output and high cardiac output

Answer: (D)

Shock can be understood through how much blood the heart is pumping and how the vessels respond. There are two broad hemodynamic states: low cardiac output and high cardiac output. In low-output shock, the heart cannot deliver enough blood to the tissues—this occurs with conditions like severe blood loss (hypovolemia) or pump failure (cardiogenic shock). The result is reduced cardiac output and widespread poor tissue perfusion. In high-output shock, the heart pumps more blood than normal, but the systemic vessels are dilated so much that perfusion remains inadequate despite a large output. This is typical of early distributive shocks, such as septic shock, where vasodilation increases cardiac output. So, the correct framing of shock is by these two varieties—low vs high cardiac output—rather than by specific causes.

Shock can be understood through how much blood the heart is pumping and how the vessels respond. There are two broad hemodynamic states: low cardiac output and high cardiac output.

In low-output shock, the heart cannot deliver enough blood to the tissues—this occurs with conditions like severe blood loss (hypovolemia) or pump failure (cardiogenic shock). The result is reduced cardiac output and widespread poor tissue perfusion.

In high-output shock, the heart pumps more blood than normal, but the systemic vessels are dilated so much that perfusion remains inadequate despite a large output. This is typical of early distributive shocks, such as septic shock, where vasodilation increases cardiac output.

So, the correct framing of shock is by these two varieties—low vs high cardiac output—rather than by specific causes.