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Sudden cardiac death during nighttime hours.

Archana Ramireddy1, Harpriya S Chugh1, Kyndaron Reinier1

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Sudden cardiac death (SCD) during the night is more common in women, with female sex being an independent risk factor. Central nervous system-affecting medications and respiratory issues increase nighttime SCD risk, particularly for women.

Keywords:
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Area of Science:

  • Cardiology
  • Public Health
  • Sleep Medicine

Background:

  • Sudden cardiac death (SCD) during nighttime hours, without clear triggers, is a significant concern.
  • Limited research exists on general population nighttime SCD, hindering sex-specific analysis.
  • Previous studies on rare nocturnal SCD syndromes suggest male predominance and link to sleep-disordered breathing.

Purpose of the Study:

  • To investigate the mechanisms behind nighttime SCD in the general population.
  • To identify factors contributing to sudden cardiac death during sleep hours.

Main Methods:

  • Analysis of SCD cases from the Oregon Sudden Unexpected Death Study.
  • Comparison of nighttime SCD (10 PM - 6 AM) with daytime events.
  • Logistic regression to determine independent risk factors for nighttime SCD.

Main Results:

  • 22.3% of 4126 SCD cases occurred during nighttime hours.
  • Women were more likely than men to experience nighttime SCD (25.4% vs 20.6%).
  • Independent predictors of nighttime SCD included female sex, somnolence-inducing medications, and chronic obstructive pulmonary disease/asthma.

Conclusions:

  • Women are more prone to nighttime SCD than men, with female sex being an independent predictor.
  • Respiratory suppression is a concern, especially with central nervous system-affecting medications.
  • Caution is advised when prescribing CNS-affecting drugs to at-risk individuals, particularly women, due to potential for respiratory depression and increased SCD risk.