Hypercalcaemia in ECG is diagnosed by: (A) Increased QT interval, (B) Decreased QT interval, (C) Increased PR interval, (D) Tall T waves
Answer is B. Hypocalcemia typically prolongs the QT interval (ST poion), whereas hypercalcemia shoens it .Digitalis glycosides also shoen the QT interval, often with a characteristic "scooping" of the ST-T-wave complex (digitalis effect). Ref Harrison 20th edition pg 1532