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Quantitation of rhythmic diameter changes in arterial microcirculation.

A Colantuoni, S Bertuglia, M Intaglietta

The American Journal of Physiology

|April 1, 1984

Summary

This summary is machine-generated.

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Arterial microvessels in hamsters exhibit rhythmic diameter changes for two weeks. This activity, likely from smooth muscle cells, ceases with anesthesia.

Area of Science:

Physiology
Microcirculation
Vascular Biology

Background:

Arterial and arteriolar blood vessel dynamics are crucial for regulating blood flow.
Understanding rhythmic activity in microvasculature is key to comprehending local blood flow control.

Purpose of the Study:

To investigate the time-dependent diameter changes in arterial microvessels.
To characterize the frequency and amplitude of this rhythmic activity.
To explore the underlying mechanisms and the effect of anesthesia.

Main Methods:

Utilized the hamster skin fold window preparation for in vivo observation.
Measured vessel diameters over time for two weeks.
Applied power spectrum analysis with Fourier transform to determine frequencies.

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Main Results:

Observed continuous rhythmic diameter activity in arterial microvessels for up to 2 weeks.
Found frequency decreased with increasing vessel size, from 9-15 cycles/min in arterioles to 1-3 cycles/min in small arteries.
Activity was not synchronized and was abolished by anesthesia (pentobarbital, chloralose-urethan).

Conclusions:

The rhythmic activity suggests local pacemaker control by smooth muscle cells.
Anesthesia's effect supports a neural or myogenic origin of the observed phenomenon.
Findings provide insights into the intrinsic regulation of microvascular diameter.