The duration of the P wave should be less than 0.12 second and appears upright in leads I and II. P waves may also appear notched, or biphasic, which depicts sequential activation of the right and left atria. The PR interval, which is the time between the end of the P wave and the beginning of the R wave, should be 0.12 to 0.2 second.
R-wave peak time (Figure 9) is the interval from the beginning of the QRS-complex to the apex of the R-wave. This interval reflects the time elapsed for the depolarization to spread from the endocardium to the epicardium. R-wave peak time is prolonged in hypertrophy and conduction disturbances. Normal values for R-wave peak time follow:
An abnormal electrocardiogram indicates heart rhythm abnormalities, damage to the heart muscle or problems with the amount of electrolytes in the blood, notes MedlinePlus. During an ECG, a technician...
It is seen as three closely related waves on the ECG (Q,R and S wave). ST segment. The ST-segment starts at the end of the S-wave and finishes at the start of the T-wave. The ST segment is an isoelectric line that represents the time between depolarization and repolarization of the ventricles (i.e. contraction). T-wave
- S wave represents the last phase of ventricular depolarization at the base of the heart. - Atrial repolarization also occurs during this time but the signal is obscured by the large QRS complex.
The P wave represents atrial depolarization and the QRS represents ventricular depolarization. The T wave reflects the phase of rapid repolarization of the ventricles. P Wave The P wave is the first wave of the electrocardiogram and represents the spread of electrical impulse through the atrial musculature (activation or depolarization).
Examples of circadian rhythms include sleep cycles, temperature control, thirst, eating patterns, hormone production, brain wave activity and cell regeneration. Circadian rhythms are found in many living things. This includes people and other animals as well as plants and microbes.
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A low voltage electrocardiogram result can be caused by a problem in the heart's ability to generate electricity or can be due to the presence of fluid or air in the chest between the electrodes and the heart.
The isoelectric line is completely flat, while positive waves are above the line and negative waves are below it. Between cycles, the ECG recorder returns the base isoelectric line. Sonya Christensen of Andrews University explains that the entire cardiac cycle includes a P wave, a QRS complex and a T wave with interspersed isoelectric lines.