A Cardiac Index below 2.5 L/min/m² indicates:

A Cardiac Index below 2.5 L/min/m² indicates:

• A. Dangerously low perfusion to the organs
• B. Normal perfusion
• C. High perfusion
• D. Increased afterload

Answer: (A)

Cardiac index is the cardiac output adjusted for body surface area, providing a size-normalized measure of blood flow to the body's tissues. The normal range is roughly 2.5 to 4.0 L/min/m². When the cardiac index falls below about 2.5, the amount of blood being delivered per unit body surface area is insufficient to meet the tissues’ metabolic demands, so organ perfusion becomes critically reduced. That is why a value under 2.5 is described as dangerous low perfusion to the organs. Normal perfusion corresponds to CI in the 2.5–4 range, while high perfusion would be CI above about 4.0. Increased afterload can depress cardiac output and thus lower CI, but a low CI value on its own does not specify increased afterload; it simply signals inadequate perfusion and often prompts evaluation of preload, contractility, and afterload to guide resuscitation.

Cardiac index is the cardiac output adjusted for body surface area, providing a size-normalized measure of blood flow to the body's tissues. The normal range is roughly 2.5 to 4.0 L/min/m². When the cardiac index falls below about 2.5, the amount of blood being delivered per unit body surface area is insufficient to meet the tissues’ metabolic demands, so organ perfusion becomes critically reduced. That is why a value under 2.5 is described as dangerous low perfusion to the organs.

Normal perfusion corresponds to CI in the 2.5–4 range, while high perfusion would be CI above about 4.0. Increased afterload can depress cardiac output and thus lower CI, but a low CI value on its own does not specify increased afterload; it simply signals inadequate perfusion and often prompts evaluation of preload, contractility, and afterload to guide resuscitation.