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Nocturnal diuresis in panhypopituitarism
Metabolism: Clinical and Experimental
|September 1, 1978
Summary
Patients with panhypopituitarism exhibit distinct nocturnal water excretion patterns, showing significant diuresis at night despite low cortisol levels. This contrasts with morning antidiuresis, highlighting unique physiological responses.
Area of Science:
- Endocrinology
- Nephrology
- Physiology
Background:
- Impaired water diuresis is recognized in adrenocortical insufficiency.
- Nocturnal diuretic patterns in endocrine disorders remain under-investigated.
Observation:
- Two panhypopituitarism patients displayed different morning and nocturnal diuretic responses.
- Marked nocturnal diuresis occurred after water loading, independent of serum cortisol levels.
- Morning antidiuresis showed rising urine osmolality despite water loading and limited response to vasopressin.
Findings:
- Water loading at night induced diuresis in panhypopituitarism patients, unlike in the morning.
- The kidneys showed limited response to vasopressin and glucose infusion in the morning.
- Furosemide rapidly restored diuretic response, while glucocorticoid replacement had a 2-hour latent effect.
Implications:
- Nocturnal physiological mechanisms for diuresis may operate independently of glucocorticoids.
- Understanding these diurnal variations is crucial for managing fluid balance in endocrine disorders.
- Further research is needed to elucidate the latent period of glucocorticoid action on diuresis.