Syncope most directly involves which organ?

Syncope most directly involves which organ?

• A. Heart
• B. Lungs
• C. Brain
• D. Liver

Answer: (A)

Syncope is a temporary loss of consciousness caused by a brief drop in blood flow to the brain. The brain’s function is what is affected, but the organ that most directly determines whether that cerebral blood flow stays adequate is the heart. When the heart’s pumping is impaired—due to arrhythmias, structural disease, or obstruction—cardiac output falls and the brain is quickly starved of oxygen, leading to fainting. Lungs and liver don’t drive this rapid change in cerebral perfusion, so the heart is the best answer because it controls the blood supply to the brain that creates the syncope event.

Syncope is a temporary loss of consciousness caused by a brief drop in blood flow to the brain. The brain’s function is what is affected, but the organ that most directly determines whether that cerebral blood flow stays adequate is the heart. When the heart’s pumping is impaired—due to arrhythmias, structural disease, or obstruction—cardiac output falls and the brain is quickly starved of oxygen, leading to fainting. Lungs and liver don’t drive this rapid change in cerebral perfusion, so the heart is the best answer because it controls the blood supply to the brain that creates the syncope event.