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[Changes in cardiac function during recreational diving]

A Boussuges1, V Lafay

  • 1Service de réanimation médicale et hyperbarie, hôpital Salvator, Marseille.

Archives Des Maladies Du Coeur Et Des Vaisseaux
|February 1, 1997
PubMed
Summary
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Cardiac patients can dive, but cardiologists must understand how underwater conditions affect heart function. Factors like pressure, hyperoxia, and cold can alter heart rate, blood pressure, and increase risks during diving and decompression.

Area of Science:

  • Cardiology
  • Diving Medicine
  • Physiology

Context:

  • Underwater diving is a popular recreational activity.
  • Cardiac patients may seek to participate in diving.
  • Understanding the physiological impact on the heart is crucial for this population.

Purpose:

  • To inform cardiologists about the potential cardiovascular changes during underwater diving.
  • To highlight the haemodynamic factors affecting cardiac function in divers.
  • To raise awareness of risks for cardiac patients during diving and decompression.

Summary:

  • Diving involves multiple haemodynamic challenges: increased afterload from gas density, bradycardia from hyperoxia, altered conduction from hydrostatic pressure, increased preload from immersion, and elevated right heart pressures during decompression.

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  • Cold exposure further increases afterload and slows heart rate.
  • Gaseous pulmonary embolism during decompression poses a significant risk, especially for patients with right-to-left shunts.

    • Impact:

    • Diving-related physiological stressors can destabilize cardiac function in patients.
    • This knowledge is vital for assessing the fitness of cardiac patients for diving.
    • Failure to account for these factors can lead to serious accidents in cardiac patients who dive.