Interruptions in chest compressions during CPR primarily affect survival by decreasing what?

Interruptions in chest compressions during CPR primarily affect survival by decreasing what?

• A. Increase Coronary Perfusion Pressure
• B. No effect on CPP
• C. Decrease Coronary Perfusion Pressure (CPP)
• D. Improve blood pressure

Answer: (C)

When chest compressions pause, the heart’s own blood flow suffers because the perfusion of the heart muscle relies on a stable coronary perfusion pressure (CPP). CPP is the pressure gradient that drives blood through the coronary arteries, roughly the difference between aortic (diastolic) pressure and right atrial pressure. During CPR, sustained compressions help maintain a higher aortic diastolic pressure and lower right atrial pressure, preserving CPP. If compressions stop, arterial pressure falls and right atrial pressure can rise or remain elevated, causing CPP to drop quickly. This reduced CPP means the myocardium receives less blood flow and oxygen, diminishing the chance of return of spontaneous circulation and overall survival. So interruptions primarily decrease CPP, which harms survival. The other options don’t fit because interruptions do not increase CPP or improve blood pressure, and they certainly do not have no effect—the impact is a clear reduction in the coronary perfusion gradient.

When chest compressions pause, the heart’s own blood flow suffers because the perfusion of the heart muscle relies on a stable coronary perfusion pressure (CPP). CPP is the pressure gradient that drives blood through the coronary arteries, roughly the difference between aortic (diastolic) pressure and right atrial pressure. During CPR, sustained compressions help maintain a higher aortic diastolic pressure and lower right atrial pressure, preserving CPP. If compressions stop, arterial pressure falls and right atrial pressure can rise or remain elevated, causing CPP to drop quickly. This reduced CPP means the myocardium receives less blood flow and oxygen, diminishing the chance of return of spontaneous circulation and overall survival. So interruptions primarily decrease CPP, which harms survival. The other options don’t fit because interruptions do not increase CPP or improve blood pressure, and they certainly do not have no effect—the impact is a clear reduction in the coronary perfusion gradient.