What question did this study set out to answer?

To determine the recovery timeline of baroreflex sensitivity following anesthesia and assess whether it recovers synchronously with blood pressure and consciousness.

December 11, 2003Journal of Cardiovascular Pharmacology

Asynchronism of the Recovery of Baroreflex Sensitivity, Blood Pressure, and Consciousness from Anesthesia in Rats

Q: What is the clinical evidence from this study?

Study design: Other. Population: Anesthesia. Intervention: Anesthetics (diazepam/ketamine, chloral hydrate, sodium pentobarbital, urethane). Primary outcome: Time course of baroreflex sensitivity (BRS) recovery.

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Key result

In male rats, baroreflex sensitivity recovery from anesthesia (approx. 5 hours for most agents) lagged behind the recovery of consciousness and blood pressure (approx. 2 hours).

Why the study?

Does the recovery of baroreflex sensitivity synchronize with the recovery of consciousness and blood pressure after anesthesia in rats?

Population

Male Sprague-Dawley rats

Design

Preclinical

Follow-up

Up to >24 hours

Authors

WYWuliya YimingXinjiang Medical University SHShu HeNanjing Forestry University CMChao‐Yu MiaoGeneral / Preventive / Lipids

Discussion

Member takes

Implication

Delayed baroreflex recovery in rats should not change clinical practice; leaves open human relevance after anesthesia.

Key Points

To determine the recovery timeline of baroreflex sensitivity following anesthesia and assess whether it recovers synchronously with blood pressure and consciousness.
Administered routine intraperitoneal doses of four anesthetic regimens to male Sprague-Dawley rats: diazepam/ketamine (5/50 mg/kg), chloral hydrate (0.3 g/kg), sodium pentobarbital (30 mg/kg), and urethane (1.0 g/kg).
Monitored anesthetic depth via algesthesia and corneal reflex for 1–2.5 hours, measuring baroreflex sensitivity dynamically via intravenous phenylephrine injections.
Baroreflex sensitivity was rapidly inhibited with maximum depressions of 51%–80%, requiring approximately 5 hours to recover for diazepam/ketamine, chloral hydrate, and pentobarbital, and over 24 hours for urethane.
Blood pressure dropped less severely than baroreflex sensitivity (8% nonsignificant reduction for diazepam/ketamine; 12%–30% for others) and normalized within approximately 2 hours, except with chloral hydrate (>6 hours).

Structured PICO

Does the recovery of baroreflex sensitivity synchronize with the recovery of consciousness and blood pressure after anesthesia in rats?

Population

Male Sprague-Dawley rats administered various anesthetics to determine the time course of baroreflex sensitivity recovery.

Intervention

Intraperitoneal administration of anesthetics: diazepam (5 mg/kg) and ketamine (50 mg/kg); chloral hydrate (0.3 g/kg); sodium pentobarbital (30 mg/kg); or urethane (1.0 g/kg)

Outcome

Time course of baroreflex sensitivity (BRS) recovery from anesthesia and its synchronicity with the recovery of consciousness and blood pressuresurrogate

In a rat model, the recovery of baroreflex sensitivity following anesthesia is significantly delayed compared to the recovery of blood pressure and consciousness.

Cite This Study

Yiming et al. (2003) studied Anesthesia. Anesthetics (diazepam/ketamine, chloral hydrate, sodium pentobarbital, urethane) was evaluated on Time course of baroreflex sensitivity (BRS) recovery. In male rats, baroreflex sensitivity recovery from anesthesia (approx. 5 hours for most agents) lagged behind the recovery of consciousness and blood pressure (approx. 2 hours).

synapsesocial.com/papers/6a84734974ee596ff2c52623 https://doi.org/10.1097/00005344-200401000-00001

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Asynchronism of the Recovery of Baroreflex Sensitivity, Blood Pressure, and Consciousness from Anesthesia in Rats

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Asynchronism of the Recovery of Baroreflex Sensitivity, Blood Pressure, and Consciousness from Anesthesia in Rats

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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