Wortsman J, Frank S
Clin Cardiol. 1981 Mar;4(2):87-90. doi: 10.1002/clc.4960040205.
Corrected QT intervals were determined in 13 patients with severe, chronic hypercalcemia. The QoTc interval was short in only 2 of 14 instances; QATC in 5 of 15 instances, and QETC in 5 of 16 instances. The correlations between serum calcium and the QTC measurement were not significant when evaluating either linear or curvilinear (quadratic) relationships. Small and inconsistent changes were found when comparing the QT intervals before the development of the hypercalcemic episode, during hypercalcemia, or after successful treatment. We conclude that shortening of the QT interval is an unreliable index of clinical (chronic) hypercalcemia.
对13例重度慢性高钙血症患者测定了校正QT间期。在14例中有2例QTc间期缩短；15例中有5例QATC缩短，16例中有5例QETC缩短。在评估线性或曲线（二次）关系时，血清钙与QTC测量值之间的相关性不显著。在比较高钙血症发作前、高钙血症期间或成功治疗后的QT间期时，发现变化小且不一致。我们得出结论，QT间期缩短是临床（慢性）高钙血症的不可靠指标。
