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Validation of an algorithm to reveal the U wave in atrial fibrillation (2018)
Journal Article
Al-Karadi, M. S., Wilkinson, A. J., Caldwell, J., & Langley, P. (2018). Validation of an algorithm to reveal the U wave in atrial fibrillation. Scientific reports, 8(1), doi:10.1038/s41598-018-30493-8

Major cardiac organisations recommend U wave abnormalities should be reported during ECG interpretation. However, U waves cannot be measured in patients with atrial fibrillation (AF) due to the obscuring fibrillatory wave. The aim was to validate a U... Read More

Heart sound classification from unsegmented phonocardiograms (2017)
Journal Article
Langley, P., & Murray, A. (2017). Heart sound classification from unsegmented phonocardiograms. Physiological Measurement, 38(8), (1658-1670). doi:10.1088/1361-6579/aa724c. ISSN 0967-3334

Objective Most algorithms for automated analysis of phonocardiograms (PCG) require segmentation of the signal into the characteristic heart sounds. The aim was to assess the feasibility for accurate classification of heart sounds on short, unsegmente... Read More

Accuracy of pulse interval timing in ambulatory blood pressure measurement (2016)
Journal Article
Kane, S. A., Blake, J. R., McArdle, F. J., Sims, A. J., Langley, P., Blake, J., …Sims, A. (2016). Accuracy of pulse interval timing in ambulatory blood pressure measurement. Scientific reports, 6(1), (37472-1-37472-7). doi:10.1038/srep37472. ISSN 2045-2322

Blood pressure (BP) monitors rely on pulse detection. Some blood pressure monitors use pulse timings to analyse pulse interval variability for arrhythmia screening, but this assumes that the pulse interval timings detected from BP cuffs are accurate... Read More

The atrial T wave: The elusive electrocardiographic wave exposed by a case of shifting atrial pacemaker (2016)
Journal Article
Langley, P., & Caldwell, J. (2016). The atrial T wave: The elusive electrocardiographic wave exposed by a case of shifting atrial pacemaker. Journal of Electrocardiology, 49(4), (557-559). doi:10.1016/j.jelectrocard.2016.05.003. ISSN 0022-0736

The atrial T wave (Ta wave) is the body surface manifestation of atrial repolarisation and, unlike the P wave (atrial depolarisation), is little recognised. We report the case of a patient with shifting pacemaker which clearly demonstrates the effect... Read More

Opportunistic detection of atrial fibrillation using blood pressure monitors: a systematic review (2016)
Journal Article
Kane, S. A., Blake, J. R., McArdle, F. J., Langley, P., & Sims, A. J. (2016). Opportunistic detection of atrial fibrillation using blood pressure monitors: a systematic review. Open heart, 3(1), (e000362). doi:10.1136/openhrt-2015-000362. ISSN 2053-3624

Background: Atrial Fibrillation (AF) affects around 2% of the population and early detection is beneficial, allowing patients to begin potentially life-saving anticoagulant therapies. Blood pressure (BP) monitors may offer an opportunity to screen fo... Read More

Wavelet entropy as a measure of ventricular beat suppression from the electrocardiogram in atrial fibrillation (2015)
Journal Article
Langley, P. (2015). Wavelet entropy as a measure of ventricular beat suppression from the electrocardiogram in atrial fibrillation. Entropy, 17(9), (6397-6411). doi:10.3390/e17096397. ISSN 1099-4300

A novel method of quantifying the effectiveness of the suppression of ventricular activity from electrocardiograms (ECGs) in atrial fibrillation is proposed. The temporal distribution of the energy of wavelet coefficients is quantified by wavelet ent... Read More

Characteristics of the atrial repolarization phase of the ECG in paroxysmal atrial fibrillation patients and controls (2015)
Journal Article
Langley, P., Bourke, J. P., & Giacopelli, D. (2015). Characteristics of the atrial repolarization phase of the ECG in paroxysmal atrial fibrillation patients and controls. Acta cardiologica, 70(6), (672-677). doi:10.2143/AC.70.6.3120179. ISSN 0001-5385

© 2015, Acta Cardiologica. All rights reserved. Objective The aim of this study is to characterize the observable segment of the atrial repolarization (Ta wave) of the standard ECG during sinus rhythm in paroxysmal atrial fibrillation (PAF) patients... Read More

Recurring patterns of atrial fibrillation in surface ECG predict restoration of sinus rhythm by catheter ablation (2014)
Journal Article
Di Marco, L. Y., Raine, D., Bourke, J. P., & Langley, P. (2014). Recurring patterns of atrial fibrillation in surface ECG predict restoration of sinus rhythm by catheter ablation. Computers in biology and medicine, 54, (172-179). doi:10.1016/j.compbiomed.2014.09.005. ISSN 0010-4825

Background Non-invasive tools to help identify patients likely to benefit from catheter ablation (CA) of atrial fibrillation (AF) would facilitate personalised treatment planning. Aim To investigate atrial waveform organisation through recurrence plo... Read More

Extracting fetal heart beats from maternal abdominal recordings: Selection of the optimal principal components (2014)
Journal Article
Langley, P., Di Maria, C., Liu, C., Murray, A., & Zheng, D. (2014). Extracting fetal heart beats from maternal abdominal recordings: Selection of the optimal principal components. Physiological Measurement, 35(8), 1649-1664. doi:10.1088/0967-3334/35/8/1649

This study presents a systematic comparison of different approaches to the automated selection of the principal components (PC) which optimise the detection of maternal and fetal heart beats from non-invasive maternal abdominal recordings. A public d... Read More

Recurring patterns in stationary intervals of abdominal uterine electromyograms during gestation (2014)
Journal Article
Langley, P., Di Marco, L. Y., Di Maria, C., Robson, S. C., Taggart, M. J., & Tong, W. (2014). Recurring patterns in stationary intervals of abdominal uterine electromyograms during gestation. Medical and Biological Engineering and Computing, 52(8), 707-716. doi:10.1007/s11517-014-1174-6

Abdominal uterine electromyograms (uEMG) studies have focused on uterine contractions to describe the evolution of uterine activity and preterm birth (PTB) prediction. Stationary, non-contracting uEMG has not been studied. The aim of the study was to... Read More