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The cochlear blood flow: a comparison between the laser Doppler and the microsphere surface methods
A Ohlsén1, E Hultcrantz, H C Larsen
1Department of Otorhinolaryngology, University Hospital, Uppsala, Sweden.
Acta Oto-Laryngologica
|January 1, 1994
Summary
This study compared laser Doppler (LD) and microsphere surface methods to measure cochlear blood flow (CBF) changes after applying sodium nitroprusside. Results show both methods accurately detect drug-induced increases in CBF.
Area of Science:
- Oto-rhino-laryngology
- Physiology
- Pharmacology
Background:
- The laser Doppler (LD) method's accuracy in measuring cochlear blood flow (CBF) has been debated.
- Questions remain about whether LD reflects total or regional blood flow and if it influences CBF itself.
Purpose of the Study:
- To investigate the influence of sodium nitroprusside on cochlear blood flow (CBF).
- To compare the accuracy of the laser Doppler (LD) method with the microsphere surface method (MSM) in detecting changes in CBF.
Main Methods:
- Sodium nitroprusside was topically applied to the round window membrane (RWM) in animal models.
- Cochlear blood flow (CBF) and blood pressure (BP) were measured using LD.
- The microsphere surface method (MSM) was employed for comparison.
- Control groups received saline or nicotinic acid on the RWM.
Main Results:
- Sodium nitroprusside significantly increased CBF.
- No significant changes in CBF were observed in control groups (untreated, saline, or nicotinic acid).
- The LD method and MSM showed comparable results in detecting the drug-induced increase in CBF.
Conclusions:
- The laser Doppler (LD) method is reliable for measuring drug-induced changes in cochlear blood flow (CBF).
- Topical application of sodium nitroprusside effectively increases cochlear blood flow (CBF).
- The study validates LD as a suitable technique for assessing interventions affecting cochlear hemodynamics.