endocrine and metabolic disorders
Hypokalemia
Symptoms and Signs of Hypokalemia
Mild hypokalemia (serum potassium 3 to 3.5 mEq/L [3 to 3.5 mmol/L]) rarely causes symptoms. Moderate hypokalemia (serum potassium<3 mEq/L [<3 mmol/L]) generally causes muscle weakness and may lead to paralysis and respiratory failure. Other muscular dysfunction includes cramping, fasciculations, paralytic ileus, hypoventilation, hypotension, tetany, and Rhabdomyolysis . Persistent hypokalemia can impair renal concentrating ability, causing polyuria with secondary polydipsia. 