Abstract: PUB086
The Querini Shipwreck of 1431 as a Natural Experiment in Sodium and Water Homeostasis
Session Information
Category: Fluid, Electrolytes, and Acid-Base Disorders
- 1102 Fluid, Electrolyte, and Acid-Base Disorders: Clinical
Author
- Reisinger, Nathaniel, St Louis Kidney Consultants, St Louis, Missouri, United States
Background
In 1431 Venetian nobleman Pietro Querini set sail from Candia, Crete with 800 barrels of Malvasia wine for Bruges, Flanders. In the Celtic Sea his cog was beset by storms, blown off course, and set adrift after losing rudder and sail. On December 18th the 68 men abandoned ship in two small boats losing most of their supplies. Of the 47 men in the larger boat, 26 died before survivors landed on an uninhabited island of Norway's Lofoten archipelago on January 6, 1432. Ten more died before the remainder were rescued by Norwegian fishermen and sheltered on Røst. Two independent narratives survive in archives in Rome and Venice constituting a natural experiment offering a historical lens to examine sodium and water homeostasis at physiological extremes.
Methods
Both narratives were examined as primary historical sources noting fluid intake, dietary provisions, rationing decisions, survival outcomes, and causes of death. Findings were considered against current understanding of renal concentrating capacity, fluid osmolality, vasopressin physiology, sodium storage, and cellular shifts.
Results
The crew subsisted on salted meat, dried bacon, hard biscuit, and aged cheese with wine as the primary fluid. Wine was rationed to 1 cup/day December 19th and half cup/day December 27th before exhaustion December 29th. Both accounts attribute the 26 deaths primarily to seawater ingestion, with heaviest wine consumers dying first. Those who drank urine survived. Survivors restricted high sodium food. On January 6th five men who had drunk seawater died after consuming snow. Those who avoided seawater survived identical snow exposure.
Conclusion
Wine as primary hydration suppressed ADH and raised adrenergic tone, while chronic high sodium maximised tissue GAG-mediated sodium stores, together predisposing to maladaptive fluid deprivation response. Seawater at 1000 mOsm/kg allows no net water gain. Urine osmolality in early dehydration remains below the concentrating ceiling of 1200 mOsm/kg permitting free water reclamation and suppressing thirst enough to prevent the fatal turn to seawater. Snow deaths reflect hypokalemia from chronic osmotic potassium wasting and RAAS activation, with acute intracellular shifts driven by hypothermia and refeeding rather than cerebral edema due to hypernatremia correction. These 15th-century observations remain physiologically instructive.