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Hemolysis near a transversely oscillating wire.

A R Williams, D E Hughes, W L Nyborg

Science (New York, N.Y.)

|August 28, 1970

Summary

High-frequency ultrasound causes red blood cells to rupture when oscillation amplitude surpasses a threshold. This hemolysis is likely due to microstreaming forces near the oscillating wire.

Area of Science:

Biophysics
Cell Biology
Acoustics

Background:

Erythrocyte suspensions are fundamental in biological and medical research.
Understanding cell membrane mechanics is crucial for various applications.
Hydrodynamic forces can impact cellular structures.

Purpose of the Study:

To investigate the effects of hydrodynamic forces on erythrocytes.
To determine the threshold for hemolysis induced by ultrasonic oscillation.
To elucidate the mechanism of cell rupture under acoustic stress.

Main Methods:

Erythrocyte suspensions were exposed to hydrodynamic forces.
A tungsten wire oscillated transversely at 20 kilohertz.
Oscillation amplitude was varied to identify critical thresholds.

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Main Results:

Free hemoglobin was detected in the solution, indicating hemolysis.
Hemolysis occurred only when oscillation amplitude exceeded a specific critical value.
The critical threshold for hemolysis was identified.

Conclusions:

Hydrodynamic forces generated by oscillating wires can induce erythrocyte hemolysis.
Microstreaming fields near the oscillating wire are the probable cause of cell rupture.
This study provides insights into ultrasound-induced cell damage mechanisms.