Identifying Hyponatremia in a Patient

A nurse is evaluating a patient who has experienced excessive vomiting for the past 48 hours. The nurse is concerned about the potential for fluid and electrolyte imbalances.

The patient presents with dry mucous membranes, increased heart rate, and a blood pressure of 100/60 mmHg. Upon review of laboratory results, the nurse notes that the patient's serum sodium level is 130 mEq/L. This indicates that the patient is experiencing a condition known as __________.