Related Experiment Videos
Blood velocity in human arteries measured by a bidirectional ultrasonic doppler flowmeter
Insights
Blood flow patterns in arteries vary, with peripheral resistance significantly impacting both velocity and waveform shape. This study details these distinct arterial velocity patterns in young adults.
Area of Science:
- Cardiovascular Physiology
- Hemodynamics
- Vascular Biology
Background:
- Arterial blood flow exhibits complex velocity patterns.
- Understanding these patterns is crucial for assessing vascular health.
Purpose of the Study:
- To characterize resting blood velocity patterns in 12 human arteries.
- To investigate the influence of peripheral resistance on arterial velocity patterns.
Main Methods:
- Utilized an ultrasonic Doppler flowmeter to record blood velocities.
- Studied 11 young adults, analyzing flow in various peripheral and central arteries.
- Induced reactive hyperemia in the femoral artery to assess peripheral resistance effects.
Main Results:
- Identified two primary resting velocity patterns: continuous forward flow and pulsatile flow with retrograde components.
- Observed spontaneous variations in velocity patterns in specific arteries (subclavian, axillary, brachial, radial).
- Demonstrated that increased peripheral resistance alters both the magnitude and shape of the femoral artery velocity pattern.
Conclusions:
- Peripheral resistance is a critical determinant of arterial blood velocity patterns.
- Both the mean velocity and the waveform shape are significantly influenced by peripheral resistance.
- Distinct arterial velocity patterns exist, varying by location and physiological state.
Abstract:
Blood velocities in 12 arteries were recorded by an ultrasonic doppler flowmeter in 11 young adults. Two major types of velocity patterns existed at rest. In certain arteries (the common carotid, the external carotid, the superficial temporal and the proper palmar digital arteries) flow was towards the periphery throughout the entire pulse cycle. Other arteries (the common femoral, the popliteal, the posterior tibial and the pedal artery) exhibited retrograde flow in part of the pulse cycle. In each individual a spontaneous variation between these two velocity patterns was observed in the subclavian, the axillary, the brachial and the radial artery. The velocity pattern of each artery is described, and absolute blood velocities at recognizable instances during the pulse cycle are given. The influence of peripheral resistance on the velocity pattern was investigated by reactive hyperaemia of the femoral artery. We find that not only is there an upward displacement of the resting femoral curve relative to the line of zero, but the shape of the velocity pattern is also changed. Our conclusion is that peripheral resistance is of major importance not only for the mean velocity, but also for the shape of the velocity pattern in the artery.