What are the functions of the intra-aortic balloon pump (IABP)?

• A. Increases heart rate and contractility
• B. Provides respiratory support
• C. Increases coronary-artery perfusion, decreases afterload, and assists in assessing the 6Ps
• D. Delivers intravenous fluids

Answer: (C)

Intra-aortic balloon pump function relies on counterpulsation: the balloon inflates during diastole to boost aortic diastolic pressure and coronary-artery perfusion, and it deflates just before systole to lower left-ventricular afterload. This combination improves myocardial oxygen supply while reducing the heart’s workload, helping stabilize hemodynamics. Because the catheter is usually placed in the femoral artery, ongoing assessment of distal limb perfusion is essential, which is where monitoring the 6 Ps (pain, pallor, pulselessness, paresthesias, paralysis, and temperature change) comes into play. Together, these aspects explain why the best description is that the device increases coronary-artery perfusion, decreases afterload, and assists in assessing the 6Ps. It does not primarily increase heart rate or contractility, provide respiratory support, or deliver intravenous fluids.