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Arrhythmias during spinal anesthesia for Cesarean section.

C L Shen1, Y Y Ho, Y C Hung

  • 1Department of Anesthesiology, Ton Yen General Hospital, Chu Pei, Hsin Chu, Taiwan. yuchun51@ms22.hinet.net

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|June 1, 2000
PubMed
Summary

Spinal anesthesia for Cesarean section can cause unexpected arrhythmias, including bradycardia and atrioventricular block, more often than previously thought. Vigilant monitoring is crucial, particularly for older patients, due to these potential cardiac events.

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Area of Science:

  • Anesthesiology
  • Cardiology
  • Obstetrics

Background:

  • Spinal anesthesia is a common technique for Cesarean sections.
  • The incidence of intraoperative arrhythmias during spinal anesthesia is not well-established.
  • Reported cases of severe bradycardia and cardiac arrest highlight potential risks.

Purpose of the Study:

  • To determine the incidence of arrhythmias during spinal anesthesia.
  • To assess the frequency of intraoperative cardiac events in patients undergoing Cesarean section.

Main Methods:

  • Prospective study of 254 healthy women undergoing Cesarean section.
  • Spinal anesthesia administered with bupivacaine and morphine.
  • Intraoperative arrhythmias were recorded and cardiologist-verified.

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Main Results:

  • First-degree AV block in 3.5%, second-degree AV block in 3.5%.
  • Severe bradycardia (HR < 50 bpm) in 6.7%, multiple VPCs in 1.2%.
  • Older age was associated with a higher incidence of potentially dangerous arrhythmias (P = 0.006).

Conclusions:

  • The incidence of arrhythmias and hypotension during spinal anesthesia for Cesarean section is higher than anticipated.
  • Arrhythmias are often transient but may require prompt treatment.
  • Close patient monitoring is essential, especially in elderly parturients.