3 results
A lazy man's classification of hyponatremia
There are two possible approaches to the diagnosis of hyponatremia: .
of hyponatremia ... serum osmolality, urine ... osmolality and urinary sodium ... the patient has SIADH ... #Algorithm #Differential
Hypernatremia - Differential Diagnosis Workup Algorithm

1) Check Urine Osmolality:
 > 600 mOsm/kg - Implies extrarenal mechanism
Differential Diagnosis Workup ... Algorithm 1) ... Check Urine Osmolality ... Euvolemic: Diabetes insipidus ... #sodium
Primary Polydipsia
Definition: Excessive volitional water intake
Epidemiology:
 • 6-20% of patients with psychiatric disorders - Most commonly
• Symptomatic hyponatremia ... Pseudohyponatremia, SIADH ... intoxication Initial Workup ... Osm, Serum Sodium ... , Urine Sodium