This may augment transmural heterogeneity of repolarization intrinsic to ventricular myocardium and, as a consequence, prolong the QT and JT intervals on the electrocardiogram (ECG).

Prolonged QT Interval ECG Example 3; Prolonged QT Interval ECG Example 4; References: Chou's Electrocardiography in Clinical Practice: Adult and Pediatric, Sixth Edition, Saunders, Philadelphia, 2008.

The Normal ECG. A normal ECG contains waves, intervals, segments and one complex, as defined below. Wave: A positive or negative deflection from baseline that indicates a specific electrical event ...

A P wave occurs before each QRS complex (+) with a stable PR interval (0.20 sec). The P waves are positive in leads I, II, aVF, and V4-V6. This is a normal sinus rhythm.

The QT interval is a measurement on the ECG that represents how long it takes for the heart to recover after it contracts before it's ready to contract again.

PHILADELPHIA—Abnormalities revealed by electrocardiography (ECG) may predict which patients undergoing evaluation for a renal transplant are at higher risk of death, a study found. These ...

Researchers at Mayo Clinic suggest that the established “normal” ranges for evaluating electrocardiograms for persons over 80 years old should be “revisited.” The recommendation comes in a ...

In the genetically modified heart xenotransplant (“pig heart-in-human body”) the first ever ECG showed a longer PR interval (190 ms), QRS duration (138 ms), and QT interval (538 ms) in the ...