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The recording of an ECG on standard paper allows the time taken for the various phases of electrical depolarisation to be measured, usually in milliseconds. There is a recognised normal range for such ‘intervals’: PR interval(measured from the beginni...
PR Interval: Progressive lengthening of PR interval occurs from cycle to cycle, with a P-wave lacking a subsequent QRS complex (i.e., dropped beat). P-waves: Size and shape normal. A QRS complex is periodically dropped after a single P-wave (i.e., dropped beat).Clinical...
PR interval: Represents the time taken for excitation to spread from the sino-atrial (SA) node across the atrium and down to the ventricular muscle via the bundle of His. QRS: Ventricular contraction ST segment: Ventricular relaxation T-wave: Ventricular repolarisation Normal duration of ECG segm...
Results The results showed that the average heart rate decreased, while the PR interval and QTcB increased with increasing age in both genders. The normal range of heart rate was lower than the standard interval. QRS duration was stable in all age groups but longer in males than females. QRS...
The accessory pathway conducts impulses faster than normal, producing a short PR interval. The accessory pathway also acts as an anatomical re-entry circuit, making patients susceptible to re-entry tachyarrhythmias. Patients present with episodes of paroxsymal supraventricular tachycardia (SVT), specific...
depolarization during ventricular contraction. The direction of the depolarization (and thus the electrical axis) is generally alongside the heart’s longitudinal axis (to the left and downwards). Figure 38 shows the coordinate system where the green area displays the range of the normal heart axis...
There are many features and attributes of the ECG signal that can be measured without the use of overly complex feature extraction algorithms, such as the heart rate and rhythm, PR interval, the ST segment, the QT segment, and the U, J, P, R, S, T waves just to name a few (Refer...
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Explain how a person could have a normal electrocardiogram at rest but show evidence of myocardial ischemia during exercise. a. What would happen to the heart rate if the R-R interval was increased? b. What would happen to the heart rate if ...