Can oral fluids keep adults with cholera hydrated after IV rehydration?
Yes, for most of the job. In this 1968 trial, adults with severe cholera who got a glucose and salt solution by mouth after IV rehydration needed 80% less IV fluid than patients treated with IV fluids alone. IV fluids still corrected shock first. The oral solution then replaced ongoing diarrhea losses, matched volume for volume.
The trial ran in spring 1968 at the cholera hospital of the Pakistan-SEATO Cholera Research Laboratory in Dacca (then East Pakistan, now Dhaka, Bangladesh). David Nalin, Richard Cash, and colleagues published it in The Lancet in August 1968.
Dr. Kumar’s Take
This study solved a method problem, not a chemistry problem. An earlier attempt gave patients a fixed amount of oral solution every hour. Patients losing a lot of fluid slid back toward shock, and patients losing little became swollen with excess fluid. The fix here was simple: measure what comes out and give the same volume back by mouth. That idea is what let oral rehydration move from research wards to villages, where IV fluids and trained staff were scarce.
Key Points
- Design: After IV fluids corrected shock, patients received an oral glucose and electrolyte solution whose salt content closely matched cholera diarrhea.
- Matching method: Stool losses were measured, and the same volume of oral solution was given back.
- Comparison: Control patients had their stool losses replaced with IV fluids only.
- Main result: Patients on the oral solution needed 80% less IV fluid to recover.
- No tube needed: Patients who drank the solution did as well as those who got it through a nasogastric tube.
- Vomiting: In most patients, the amount lost through vomiting was small and did not stop them from staying ahead on fluids.
Why an Earlier Attempt Failed
Before this trial, a study at another hospital gave cholera patients fixed volumes of oral solution, 500 or 750 mL per hour depending on weight. A patient losing a liter an hour fell behind and drifted back toward shock. A patient losing 250 mL an hour became overloaded. That study had to be stopped. The pattern of under- and overhydration pointed to the answer used in 1968: replace what is lost, in matching amounts.
How It Works (Biological Rationale)
- The sodium glucose cotransport mechanism enables fluid absorption even in cholera.
- Glucose facilitates sodium uptake through SGLT1, drawing water into the bloodstream.
- Oral replacement matches ongoing losses, preventing hypovolemia.
- The solution’s electrolytes were set close to what cholera diarrhea removes, so replacement puts back what is lost.
Related Studies and Research
From Sodium Glucose Cotransport to Oral Rehydration: The physiologic foundation that made oral therapy possible.
Oral Rehydration for Adults: Treatment Guide: How clinicians apply the same principles today.
Podcast: The Simple Drink That Saved Millions: The Story of Oral Rehydration Solution
Frequently Asked Questions
Why was this study so pivotal?
It showed that a carefully measured oral glucose and salt solution could replace most of the IV fluid adults with severe cholera needed, cutting IV needs by 80%. IV fluids were still used to correct shock at the start.
Did any patients deteriorate?
IV fluids corrected shock before oral therapy began. In the earlier study that used fixed oral volumes, patients either slipped back toward dehydration or became overloaded. Matching oral intake to measured losses was the fix that made the 1968 trial work.
How did this influence global health policy?
It showed that oral maintenance was practical and cut the need for IV fluid, which was costly and often unavailable. Later studies extended the method to other dehydrating diarrheas, paving the way for large-scale adoption by WHO and UNICEF.
Conclusion
This 1968 Lancet trial showed that once IV fluids had corrected shock, a glucose and salt solution given by mouth in volumes matching stool losses could do most of the work, cutting IV fluid needs by 80%. It marked the turning point from purely hospital-based IV therapy toward oral treatment that could reach villages and save millions.
