is based on a history of exposure, accompanied by rapidly progressive
hypokalemia and muscle weakness.
A. Specific levels. Blood barium levels are not routinely available. One patient
survived with a level of 3.7 mg/L, whereas postmortem levels in a fatal poisoning
were less than 2 mg/L.
B. Other useful laboratory studies include electrolytes (potassium), BUN, creatinine,
phosphorus, arterial blood gases or pulse oximetry, and continuous
ECG monitoring. Measure serum potassium levels frequently.