What typically causes syncope in an older patient?

The correct response highlights that syncope, or fainting, in older patients is often caused by an interruption of blood flow to the brain. This can occur due to various underlying conditions, particularly in older adults whose physiological responses may be diminished. Factors such as orthostatic hypotension, where blood pressure drops significantly when standing up quickly, can lead to reduced cerebral perfusion. As the brain is highly sensitive to changes in blood flow, even brief interruptions can result in syncope.

In older patients, the likelihood of cardiovascular issues, such as arrhythmias, heart failure, or vascular disease, may increase the risk of syncope. Any condition that compromises blood flow, whether through a mechanical problem with the heart or vascular resistance, can precipitate a loss of consciousness.

Other factors such as intense physical activity, although they can cause syncope, are less common in older populations, who may not engage in strenuous activities. Overhydration rarely leads to syncope; instead, dehydration is a more common issue that can lead to low blood volume and subsequent fainting. Hyperventilation primarily leads to dizziness or a tingling sensation rather than syncope itself, as it usually does not directly compromise cerebral blood flow to a significant extent. Therefore, the interruption