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[The effects of DPPH on cochlear microcirculation].

Min Chen¹, Weijia Kong

¹Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.

Lin Chuang Er Bi Yan Hou Ke Za Zhi = Journal of Clinical Otorhinolaryngology

|June 30, 2004

Summary

The free radical 1,1-Diphenyl-2-picrylhydrazyl (DPPH) impacts cochlear blood flow. Higher concentrations increased flow, while lower concentrations decreased it, indicating a dose-dependent effect on inner ear microcirculation.

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Area of Science:

Oto-rhino-laryngology
Pharmacology
Physiology

Background:

Cochlear blood flow is crucial for inner ear function.
Free radicals can influence microcirculation.
1,1-Diphenyl-2-picrylhydrazyl (DPPH) is a known free radical scavenger.

Purpose of the Study:

To determine the effect of DPPH on cochlear blood flow.
To investigate potential dose-dependent responses of cochlear microcirculation to DPPH.

Main Methods:

Guinea pigs were randomly assigned to control, 0.1 mmol/L DPPH, or 1 mmol/L DPPH groups.
DPPH or vehicle was applied to the round window membrane.
Cochlear blood flow and mean arterial blood pressure (MABP) were monitored using laser Doppler flowmetry and a pressure sensor.

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Main Results:

Mean arterial blood pressure remained stable throughout the experiment.
Cochlear blood flow significantly increased by 12.49% in the 1 mmol/L DPPH group (P < 0.05).
Cochlear blood flow significantly decreased by 3.02% in the 0.1 mmol/L DPPH group (P < 0.05).

Conclusions:

DPPH exerts a significant effect on cochlear microcirculation.
The observed effects suggest a complex, potentially dose-dependent interaction between DPPH and inner ear blood flow.
Further research is needed to elucidate the underlying mechanisms of DPPH's impact on cochlear hemodynamics.