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Post-traumatic diabetes insipidus combined with primary polydipsia.
1Department of Clinical Biochemistry, St Luke's Hospital, Guildford, Surrey, UK.
Postgraduate Medical Journal
|January 1, 1987
Summary
A head injury caused diabetes insipidus and persistent thirst, even with treatment. Symptoms resolved only when plasma osmolality was significantly lowered, suggesting a reset thirst osmostat.
Area of Science:
- Neuroendocrinology
- Nephrology
- Internal Medicine
Background:
- Diabetes insipidus (DI) is characterized by excessive thirst and urination.
- Head injuries can disrupt the hypothalamus, potentially leading to DI.
- Standard treatment for DI involves desmopressin acetate (DDAVP).
Observation:
- A patient presented with persistent thirst despite DDAVP treatment and normal plasma osmolality following a head injury.
- Complete symptom relief was achieved only when plasma osmolality dropped below 270 mOsm/kg.
- This indicated an unusual response not typical for standard DI management.
Findings:
- The case suggests a potential hypothalamic injury in the patient.
- This injury may have caused a resetting of the thirst osmostat.
- This led to a unique form of primary polydipsia co-occurring with DI.
Implications:
- This case highlights a rare complication of head trauma.
- It suggests that hypothalamic damage can alter thirst regulation beyond typical DI.
- Further research into osmostat resetting is warranted for complex cases of polyuria and polydipsia.