The internal carotid artery (ICA) typically shows what type of resistance waveform?

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Prepare for the Vascular Techniques Exam 3. Study with in-depth questions, hints, and explanations to fully understand vascular techniques. Bolster your knowledge and ensure success on your exam!

Multiple Choice

The internal carotid artery (ICA) typically shows what type of resistance waveform?

Explanation:
When evaluating with Doppler, the resistance pattern reflects the downstream vascular bed. The brain needs constant blood flow, so the cerebral arterioles stay dilated and present low resistance. The internal carotid artery, which supplies the brain, therefore shows a low-resistance waveform with substantial forward flow throughout diastole. This means the end-diastolic velocity is relatively high and the waveform is more rounded and continuous. In contrast, vessels feeding high-resistance beds, like the external carotid artery, show a sharp systolic peak with little diastolic flow. So the normal internal carotid artery is characterized by a low-resistance waveform.

When evaluating with Doppler, the resistance pattern reflects the downstream vascular bed. The brain needs constant blood flow, so the cerebral arterioles stay dilated and present low resistance. The internal carotid artery, which supplies the brain, therefore shows a low-resistance waveform with substantial forward flow throughout diastole. This means the end-diastolic velocity is relatively high and the waveform is more rounded and continuous. In contrast, vessels feeding high-resistance beds, like the external carotid artery, show a sharp systolic peak with little diastolic flow. So the normal internal carotid artery is characterized by a low-resistance waveform.

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