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[Paradoxical bradycardia and hemorrhagic shock]
C Colilles1, J Papaceit, E Laguna
1Servicio de Anestesiología y Reanimación, Hospital de Sabadell, Barcelona.
Revista Espanola De Anestesiologia Y Reanimacion
|July 1, 1992
Summary
Paradoxical bradycardia can occur during acute hemorrhage as a protective reflex to maintain blood flow. This vagal mechanism requires prompt fluid resuscitation and contraindicates vagolytic agents.
Area of Science:
- Cardiology
- Physiology
Background:
- Acute hemorrhage can lead to hypotension and hypovolemia.
- Myocardial disease is not a prerequisite for paradoxical bradycardia.
Observation:
- Two cases of paradoxical bradycardia were observed in conscious patients with acute hemorrhage and hypotension.
- This bradycardia occurred without prior cardiac history.
Findings:
- Paradoxical bradycardia may be a protective vagal reflex to enhance ventricular filling during massive hypovolemia.
- This reflex aims to maintain systemic vascular resistance and cerebral blood flow.
Implications:
- Distinguishing this reflex from vasovagal syncope is crucial for diagnosis.
- Paradoxical bradycardia signals significant bleeding requiring immediate volume replacement.
- Vagolytic agents are contraindicated due to arrhythmia risk.