Which condition is defined by the heart's inability to contract effectively, resulting in poor cardiac output?

• A. Cardiogenic Shock
• B. Hypovolemic Shock
• C. Distributive Shock
• D. Anaphylactic Shock

Answer: (A)

The key idea is pump failure: when the heart can’t contract effectively, it can’t generate enough blood flow to meet the body's needs, so cardiac output falls. Cardiogenic shock is precisely this scenario—the heart’s impaired pumping leads to very low output despite enough or even excess blood volume in the chambers. This often follows a severe myocardial infarction, myocarditis, or dangerous arrhythmias, and it produces signs like low blood pressure, rapid and weak pulse, cool and clammy skin, and often shortness of breath from pulmonary edema. The problem isn’t a lack of volume or a dilated vessel network; it’s the heart’s reduced ability to squeeze and propel blood forward.

In contrast, hypovolemic shock comes from a lack of circulating volume (blood or fluids), so the issue is preload and venous return, not poor contractility. Distributive shock, including anaphylactic shock, involves widespread vasodilation and maldistribution of blood flow, with the heart often still able to contract but facing a reduced effective circulating volume.