What question did this study set out to answer?

To develop and validate a computerized method for the continuous calculation of cardiac baroreceptor reflex sensitivity from spontaneous fluctuations in blood pressure and pulse interval in rats.

April 1, 1997Journal of Hypertension

Validation of a continuous baroreceptor reflex sensitivity index calculated from spontaneous fluctuations of blood pressure and pulse interval in rats

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Population

Adult Wistar-Kyoto rats

Comparison

Continuous computerized calculation of… vs Standard pharmacological methods and spectral…

Design

Preclinical

Follow-up

24 h periods

Authors

JOJan OostingLeiden University Medical Center HSHarry A.J. Struijker-BoudierVascular Medicine BJBen JanssenMaastricht University Medical Centre

Discussion

Member takes

Implication

Supports continuous baroreflex monitoring in rat models; leaves open translation to clinical use.

Key Points

To develop and validate a computerized method for the continuous calculation of cardiac baroreceptor reflex sensitivity from spontaneous fluctuations in blood pressure and pulse interval in rats.
Recorded beat-to-beat blood pressure and pulse interval in adult Wistar-Kyoto rats over two consecutive 30-minute periods, comparing spectral analysis and sequential time-series methods to standard pharmacological testing with nitroprusside and phenylephrine.
Assessed autonomic nervous system contributions using pharmacological blockers (metoprolol, methyl-atropine, and hexamethonium) and evaluated continuous 24-hour recordings in intact rats, sino-aortic denervated rats, and rats with nucleus tractus solitarius lesions.
The time-series method correlated more strongly with pharmacological baroreflex sensitivity measurements (R² = 0.64) than spectral analysis techniques (R² = 0.16).
Continuous baroreflex sensitivity calculated via the time-series method fluctuated across the 24-hour cycle, peaking during sleep, and fell close to zero following surgical baroreflex elimination.
Pharmacological autonomic blockade revealed that the calculated index reflects parasympathetic rather than sympathetic baroreflex modulation.

Structured PICO

Population

Adult Wistar-Kyoto (WKY) rats (intact, sino-aortic denervated, or with electrical lesioning of the nucleus tractus solitarius)

Intervention

Continuous computerized calculation of baroreceptor reflex sensitivity (BRS) using sequential time-series methods from spontaneous changes in blood pressure and pulse interval

Comparator

Standard pharmacological methods (nitroprusside and phenylephrine injections) and spectral analysis techniques

Outcome

Correlation coefficient between BRS values derived from the continuous calculation methods and standard pharmacological methodssurrogate

A newly developed time-series method faithfully calculates an index of cardiac baroreflex gain in rats, allowing for continuous on-line monitoring.

Cite This Study

Oosting et al. (1997) studied this question.

synapsesocial.com/papers/6a71fe76f44fa9f079dfa03b https://doi.org/10.1097/00004872-199715040-00010

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Validation of a continuous baroreceptor reflex sensitivity index calculated from spontaneous fluctuations of blood pressure and pulse interval in rats

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Validation of a continuous baroreceptor reflex sensitivity index calculated from spontaneous fluctuations of blood pressure and pulse interval in rats

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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