Thrombus formation involving which location is most likely to have put him at greater risk for the TIA?

Thrombus formation involving which location is most likely to have put him at greater risk for the TIA?

• A. vertebral artery
• B. superior vena cava
• C. left ventricle
• D. coronary artery

Answer: (C)

TIAs come from arterial occlusions that block blood flow to brain tissue. A thrombus in the left ventricle can shed emboli into the systemic arteries and travel up to the cerebral circulation, lodging briefly in cerebral arteries and causing transient neurologic deficits. This makes a left-ventricular source a classic and high-risk origin for brain embolism leading to TIAs, especially after heart attack or LV dysfunction. In contrast, a thrombus in the superior vena cava is a venous clot and would have to cross to the arterial side via an abnormal shunt to cause brain ischemia; a coronary artery thrombus triggers a myocardial infarction, not a TIA; and a vertebral artery thrombus could cause brainstem symptoms but is less likely to produce the typical embolic TIA compared with a left-heart source.

TIAs come from arterial occlusions that block blood flow to brain tissue. A thrombus in the left ventricle can shed emboli into the systemic arteries and travel up to the cerebral circulation, lodging briefly in cerebral arteries and causing transient neurologic deficits. This makes a left-ventricular source a classic and high-risk origin for brain embolism leading to TIAs, especially after heart attack or LV dysfunction. In contrast, a thrombus in the superior vena cava is a venous clot and would have to cross to the arterial side via an abnormal shunt to cause brain ischemia; a coronary artery thrombus triggers a myocardial infarction, not a TIA; and a vertebral artery thrombus could cause brainstem symptoms but is less likely to produce the typical embolic TIA compared with a left-heart source.