Dehydration and Electrolyte Imbalance Management

Assessment and Diagnosis

The European Society for Clinical Nutrition and Metabolism (ESPEN) guidelines recommend that in older adults with volume depletion, a person with at least four of the following seven signs is likely to have moderate to severe volume depletion: confusion, non-fluent speech, extremity weakness, dry mucous membranes, dry tongue, furrowed tongue, and sunken eyes 1.
Individual signs are subtle and unreliable in elderly patients, and a systematic approach provides better diagnostic accuracy than single clinical findings 2.

The American Diabetes Association recommends beginning aggressive fluid resuscitation with isotonic saline at 15-20 mL/kg/hour as the initial priority to restore circulatory volume and tissue perfusion in diabetic ketoacidosis (DKA) 3.
The European Society for Pediatric Gastroenterology, Hepatology and Nutrition (ESPGHAN) and ESPEN guidelines recommend a reduction rate of 10-15 mmol/L per 24 hours for hypernatremia correction 4.
The American Diabetes Association advises delaying insulin therapy and aggressively replacing potassium first if initial potassium is <3.3 mEq/L to prevent fatal cardiac arrhythmias in DKA 3.
ESPEN guidelines recommend that older adults with mild/moderate/severe volume depletion should receive isotonic fluids orally, nasogastrically, subcutaneously, or intravenously 1, 2.
The American Diabetes Association recommends adding dextrose to IV fluids to prevent hypoglycemia when blood glucose falls below 200-250 mg/dL, while continuing insulin infusion to clear ketones in DKA 3.

European guidelines for ulcerative colitis management recommend potassium supplementation of at least 60 mmol/day in severe UC with diarrhea 5.
The Italian Society of Hematology guidelines recommend maintaining a high urine output (3 L/day) to prevent renal failure in patients with Bence Jones proteinuria 6.

The American Gastroenterological Association (AGA) guidelines define hyperemesis gravidarum as intractable NVP that leads to dehydration, weight loss >5% of prepregnancy weight, and electrolyte imbalances 7.

Hypophosphatemia, hypomagnesemia, and hypocalcemia may become apparent only after initial metabolic derangements are corrected, particularly during refeeding, according to the American Family Physician 8, 9, 10.

Test results are normal in most patients with eating disorders; normal results do not exclude serious illness or medical instability, as stated by the American Family Physician 8.
Serial monitoring of plasma electrolytes is essential, as electrolyte derangements often become apparent only after admission and initial correction of metabolic abnormalities, recommended by the BMJ 9, 10, 11.

The American Family Physician recommends that potassium supplementation should be aggressive in patients with documented hypokalemia, although the article does not provide this information, other sources may 8.

The American Family Physician advises not to assume normal electrolytes exclude serious eating disorder pathology—most patients have normal labs despite significant illness 8.
The American Family Physician also recommends not to neglect serial monitoring during refeeding—phosphate, magnesium, and calcium abnormalities emerge as metabolic correction proceeds 8, 9, 10.