Article (Scientific journals)
Accurate end systole detection in dicrotic notch-less arterial pressure waveforms
Balmer, J.; Smith, R.; Pretty, C. G. et al.
2021In Journal of Clinical Monitoring and Computing
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Keywords :
Cardiovascular system; Dicrotic notch; End systole; Pressure contour interpretation; Start diastole; Blood vessels; Mammals; Probability density function; Probability distributions; Beta distributions; Detection algorithm; Estimation methods; Pressure contours; Pressure waveforms; Pulse transit time; Fiber optic sensors
Abstract :
[en] Identification of end systole is often necessary when studying events specific to systole or diastole, for example, models that estimate cardiac function and systolic time intervals like left ventricular ejection duration. In proximal arterial pressure waveforms, such as from the aorta, the dicrotic notch marks this transition from systole to diastole. However, distal arterial pressure measures are more common in a clinical setting, typically containing no dicrotic notch. This study defines a new end systole detection algorithm, for dicrotic notch-less arterial waveforms. The new algorithm utilises the beta distribution probability density function as a weighting function, which is adaptive based on previous heartbeats end systole locations. Its accuracy is compared with an existing end systole estimation method, on dicrotic notch-less distal pressure waveforms. Because there are no dicrotic notches defining end systole, validating which method performed better is more difficult. Thus, a validation method is developed using dicrotic notch locations from simultaneously measured aortic pressure, forward projected by pulse transit time (PTT) to the more distal pressure signal. Systolic durations, estimated by each of the end systole estimates, are then compared to the validation systolic duration provided by the PTT based end systole point. Data comes from ten pigs, across two protocols testing the algorithms under different hemodynamic states. The resulting mean difference ± limits of agreement between measured and estimated systolic duration, of -8.7±26.6ms versus -23.2±37.7ms, for the new and existing algorithms respectively, indicate the new algorithms superiority. © 2020, Springer Nature B.V.
Disciplines :
Anesthesia & intensive care
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Balmer, J.;  Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand
Smith, R.;  Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand
Pretty, C. G.;  Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand
Desaive, Thomas  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Thermodynamique des phénomènes irréversibles
Shaw, G. M.;  Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand
Chase, J. G.;  Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand
Language :
English
Title :
Accurate end systole detection in dicrotic notch-less arterial pressure waveforms
Publication date :
2021
Journal title :
Journal of Clinical Monitoring and Computing
ISSN :
1387-1307
eISSN :
1573-2614
Publisher :
Springer
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 June 2020

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