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Renal function in hyperbaric environment

Y S Park1, J R Claybaugh, K Shiraki

  • 1Kosin Medical College, Korea.

Applied Human Science : Journal of Physiological Anthropology
|May 12, 1998
PubMed
Summary
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During saturation diving, increased urine output and solute excretion occur due to suppressed antidiuretic hormone (ADH) and altered kidney tubule function. This hyperbaric diuresis impacts electrolyte and urea handling.

Area of Science:

  • Physiological responses to hyperbaric environments
  • Renal physiology and solute transport

Background:

  • Mixed gas saturation diving involves exposure to high ambient pressures (3-49.5 ATA).
  • Previous studies suggest significant physiological adaptations occur during such dives.

Purpose of the Study:

  • To investigate the renal mechanisms underlying changes in urine composition and volume during saturation diving.
  • To elucidate the roles of antidiuretic hormone (ADH) and aldosterone in hyperbaric diuresis.

Main Methods:

  • Analysis of urine flow, osmolality, and excretion of key solutes (urea, K+, Na+, Ca2+, Pi) in divers.
  • Assessment of fluid intake, glomerular filtration rate, and plasma parathyroid hormone (PTH).

Main Results:

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  • Increased daily urine flow (~500 ml/day) without altered fluid intake or glomerular filtration rate.
  • Decreased urine osmolality due to reduced free water reabsorption and suppressed ADH system.
  • Elevated excretion of urea, K+, Na+, Ca2+, and Pi, linked to ADH suppression, increased aldosterone, and potential inhibition of proximal tubule transport.

    • Conclusions:

    • Hyperbaric diuresis is characterized by suppressed ADH and activated aldosterone, leading to altered renal solute handling.
    • Inhibition of proximal tubule sodium and phosphate transport may be key mechanisms.
    • Understanding proximal tubule function is crucial for comprehending hyperbaric physiological adaptations.