FLUID AND ELECTROLYTE IMBALANCE Dehydration Definition: Excessive loss of body fluids causing electrolyte imbalance. Causes Signs and Symptoms Diagnostic Evaluation Medical Management Nursing Management Overhydration (Fluid Overload) Definition: Excess retention of fluids leading to edema and circulatory overload. Causes Signs and Symptoms Diagnostic Evaluation Medical Management Nursing Management Hyponatremia (Na+ <135 mEq/L) Definition: Low serum sodium leading to cellular swelling. Causes Signs and Symptoms Diagnostic Evaluation Medical Management Nursing Management