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Human carotid artery diameter and flow by a noninvasive technique
Medical Instrumentation
|March 1, 1975
Summary
This study introduces a non-invasive method to continuously measure carotid artery blood flow using a skin-placed transducer. This technique accurately assesses blood flow velocity and artery wall movement in humans, dogs, and in vitro.
Area of Science:
- Cardiovascular physiology
- Medical instrumentation
- Diagnostic techniques
Background:
- Continuous monitoring of carotid artery blood flow is crucial for diagnosing and managing cerebrovascular diseases.
- Existing methods for measuring blood flow may be invasive or provide only intermittent data.
Purpose of the Study:
- To develop and validate a non-invasive technique for continuous measurement of carotid artery blood flow.
- To assess the accuracy and applicability of the developed transducer in various settings.
Main Methods:
- A novel transducer utilizing pulse echo and Doppler shift crystals was employed.
- The transducer was tested in vitro, in canine models, and in human subjects.
- Measurements included carotid artery diameter, wall velocity, and blood flow velocity.
Main Results:
- The technique successfully measured continuous carotid artery blood flow and wall velocity.
- Pulsatile artery wall distension ranged from 8% to 13% of the diastolic diameter.
- Peak blood flow showed an inverse relationship with pulse rate, and carotid occlusion affected contralateral diastolic flow.
Conclusions:
- The developed transducer provides a reliable, non-invasive method for continuous carotid artery blood flow assessment.
- This technique has potential applications in clinical diagnostics and research related to cerebrovascular health.