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A member asked:
What is the normal range of jt interval in patients with widened qrs due to right bundle branch block? how should jt interval be calculated?
A doctor has provided 1 answer
Not possible: This very complicated question may be impossible to answer. The presence of a Right Bundle Branch Block (RBBB) ITSELF is abnormal, so there is no "normal" range for the JT interval. The JTc interval is calculated by QTc - QRS duration when QRS >120 ms. The significance is being debated, but my be related to depolarization time in BBB. JTc > 310ms has progressively higher risk of heart attack &such
Answered 10/13/2016
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