A digital approach to the cardiac cycle

Briggs, Kaleigh

doi:10.1109/51.310982

Cited by 4 publications

(1 citation statement)

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“…Human atrial depolarization is represented by the P wave and it is well observed and recorded by the standard 12-lead ECG in sinus rhythm subjects. As the human Ta wave of atrial repolarization occurs during the PR segment and QRS complex, it is not observed and recorded widely in sinus rhythm subjects by the standard 12-lead ECG ( 1 ). This is generally due to the amplitude being very low, usually in the range of 10-60 pV, and also, ventricular activation normally begins before atrial repolarization ends, and therefore, the QRS complex overlaps with the Ta wave.…”

Section: Introductionmentioning

confidence: 99%

Unmasking of atrial repolarization waves using a simple modified limb lead system

Jayaraman¹,

Uma²,

Sangareddi³

et al. 2015

Anatol J Cardiol

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Objective:In the present study, a modified limb lead (MLL) system was used to record the Ta wave in sinus rhythm and with AV block in male patients.Methods:Eighty male subjects (mean age 36±7 years) in sinus rhythm and 20 male patients with AV block (mean age 72±5 years) were included in this study. Standard limb lead (SLL) ECGs and MLL ECGs were recorded for 60 seconds each with an EDAN SE-1010 PC ECG system.Results:In sinus rhythm subjects, the observable Ta wave duration was 109±4.7 ms, the P-Ta duration was 196±5.1 ms, and the corrected P-Ta duration was 238±7.2 ms. The Ta wave peak amplitude was -42±8 pV. In AV block patients, the Ta wave duration was 314±28 ms the P-Ta duration was 418±29 ms and the corrected P-Ta duration was 462±31 ms, while the Ta wave peak amplitude was -37±9 pV. A correlation was found between the P and Ta wave amplitude, and no correlation was found between the P and Ta wave duration or the Ta amplitude and Ta duration in sinus rhythm and AV block subjects.Conclusion:The end of the Ta wave is not observable in sinus rhythm subjects, as it extends into the QRS complex and ST segment. In AV block patients, the Ta wave duration was generally three times longer than the observable Ta duration in sinus rhythm subjects.

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Section: Introductionmentioning

confidence: 99%