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.