Figure 94-30b

A. Recorded at a calcium level of 17.0 mg/dl. Illustrates the short ST segment characteristic of hypercalcemia.
B. Recorded at a Ca level of 5.9 mg/dl, Shows prolongation of the ST segment of hypocalcemia.
C. Recorded at a K level of 6.2 meq/l, Ca of 5.3 mg/dl, and P of 12.2 mg./dl. The prolongation of QT due to hypocalcemia, terminated by the tented T of hyperkalemia, is characteristic of both hypo calcemia and hyperkalemia seen in chronic renal disease.