Electrocardiography (ECG or EKG)detects the heart's electrical activity during myocardial contraction and relaxation, usually recorded by electrodes on the skin. ECG/EKG signals are recorded to examine heart rate, heart rate variability, analysis of the waveform morphology, arrhythmia, and other similar...
An EKG showed normal sinus rhythm, with a heart rate of 65 bpm, vertical heart axis, Q waves from V1-V3 and slow R wave progression in precordial leads. A 24-hour Holter EKG and a treadmill exercise stress test were unremarkable. During the echocardiography study a marked leftward and ...
This leads to several unanswered questions: Is a threshold of 1 s really optimal? Does the optimal threshold lie between 1 and 2 s? How accurate can PTB time be measured in real life without specific devices? These should be clarified in further, preferably multicentre and more extensive ...