Low heart rate is associated with cerebral pulsatility after TIA or minor stroke by Webb, AJS, Wartolowska, KA, Li, L, Rothwell, PM

“…</p> <p><strong>Results</strong> <p>Across 759 patients, average MCA-PI during monitoring was associated with lower HR and diastolic BP (DBP) and greater systolic BP (SBP) (∆MCA-PI per 10 bpm/mmHg: −0.02, −0.04, 0.03, all p < 0.001), with HR particularly associated with low end-diastolic cerebral velocity (0.86, p = 0.014). Beat-to-beat HR was strongly associated with concurrent low DBP and high SBP, potentially mediating the association with greater beat-to-beat cerebral pulsatility (average ∆MCA-PI vs HR/DBP/SBP unadjusted: −0.062, −0.052, 0.0092; adjusted for concurrent BP: −0.039, −0.11, 0.041). …”

The effects of auditory stimulation with music on heart rate variability in healthy women by Adriano L. Roque, Vitor E. Valenti, Heraldo L. Guida, Mônica F. Campos, André Knap, Luiz Carlos M. Vanderlei, Lucas L. Ferreira, Celso Ferreira, Luiz Carlos de Abreu

“…We observed no changes regarding the triangular interpolation of RR intervals, standard deviation of instantaneous beat-by-beat variability and standard deviation of instantaneous beat-by-beat variability/standard deviation in the long-term RR interval ratio. …”
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USING PHOTOPLETHYSMOGRAPHY IMAGING FOR OBJECTIVE CONTACTLESS PAIN ASSESSMENT by Marcus Koeny, Nikolai Blanik, Xinchi Yu, Michael Czaplik, Marian Walter, Rolf Rossaint, Vladimir Blazek, Steffen Leonhardt

“…Generally, ANI is computed using heart rate variability or rather beat-to-beat intervals based on an electrocardiogram (ECG). …”
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A novel technique for fetal heart rate estimation from Doppler ultrasound signal by Jezewski Janusz, Roj Dawid, Wrobel Janusz, Horoba Krzysztof

“…</p> <p>Methods</p> <p>We have proposed a new technique which provides the true beat-to-beat values of the FHR signal through multiple measurement of a given cardiac cycle in the ultrasound signal. …”
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Effect of measuring ambulatory blood pressure on sleep and on blood pressure during sleep. by Davies, R, Jenkins, N, Stradling, J

“…DESIGN: Repeated measurement of blood pressure with two ambulatory blood pressure machines (Oxford Medical ABP and AandD TM2420) during continuous measurement of beat to beat blood pressure and continuous electroencephalography. …”

Intrapartum electronic fetal monitoring and perinatal outcomes: Analysis of components of fetal heart rate pattern by Minakshi Kumari, Anuja Abraham, Kavitha Abraham, Preethi Navaneethan, Reka Karuppusami, Santhanam Sridhar, Annie Regi

“…Results: Persistent fetal tachycardia, poor beat-to-beat variability, and severe variable deceleration showed a significant association with adverse neonatal outcome and delivery by cesarean section (P < 0.05). …”
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The development and validation of an easy to use automatic QT-interval algorithm. by Ben J M Hermans, Arja S Vink, Frank C Bennis, Luc H Filippini, Veronique M F Meijborg, Arthur A M Wilde, Laurent Pison, Pieter G Postema, Tammo Delhaas

“…To evaluate QT-interval dynamics in patients and in drug safety analysis, beat-to-beat QT-interval measurements are increasingly used. …”
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Physiological systemic and cerebrovascular determinants of the risk of stroke, chronic cerebral ischaemia and vascular cognitive impairment by Webb, A

“…Beat-to-beat BP variability also progressed significantly over the age of 55 in 179 patients over five years. …”

Heart rate variability (HRV) signal analysis : clinical applications / by Kamath, Markad V., Watanabe, Mari A., Upton, Adrian R. M.

“…"Written for graduate students and professionals dealing with heart rate variability (HRV), this cutting-edge reference reviews how minute variations in the beat-to-beat heart rate are regulated. It explores how these variations can be used as a window to understanding the central and peripheral mechanisms that modulate the autonomic nervous systems. …”

Nonlinear modeling of the dynamic effects of arterial pressure and CO2 variations on cerebral blood flow in healthy humans. by Mitsis, G, Poulin, M, Robbins, P, Marmarelis, V

“…The effect of spontaneous beat-to-beat mean arterial blood pressure fluctuations and breath-to-breath end-tidal CO2 fluctuations on beat-to-beat cerebral blood flow velocity variations is studied using the Laguerre-Volterra network methodology for multiple-input nonlinear systems. …”

Multivariate system identification for cerebral autoregulation. by Peng, T, Rowley, AB, Ainslie, P, Poulin, M, Payne, S

“…The effect of spontaneous beat-to-beat mean arterial blood pressure (ABP) fluctuations and breath-to-breath end-tidal carbon dioxide (PETCO2) and end-tidal oxygen (PETO2) fluctuations on beat-to-beat cerebral bloodflow velocity (CBFV) variations is studied using a multiple coherence function. …”

Blood Pressure Estimation from Photoplythmography Using Hybrid Scattering–LSTM Networks by Osama A. Omer, Mostafa Salah, Ammar M. Hassan, Mohamed Abdel-Nasser, Norihiro Sugita, Yoshifumi Saijo

“…This work presents beat-by-beat continuous PPG-based BP monitoring while accounting for the aforementioned limitations. …”
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Arterial compliance probe for cuffless evaluation of carotid pulse pressure. by Jayaraj Joseph, Nabeel P M, Malay Ilesh Shah, Mohanasankar Sivaprakasam

“…In this work, we present a method and system for real-time and beat-by-beat evaluation of local ΔP from superficial arteries-a non-invasive, cuffless and calibration-free technique. …”
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Electrical alternans vs. pseudoelectrical alternans by Marc Mugmon

“…Beat-to-beat variations in QRS amplitude or axis may be caused by several conditions.…”
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A new methodology for assessment of the performance of heartbeat classification systems by Hool Livia C, Darrington John M

“…Our proposition lets the investigators report their findings in terms of beat-by-beat comparisons, and defers the role of assessing the utility of the classifier to the statistician. …”
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Oscillation in cycle length induces transient discordant and steady-state concordant alternans in the heart. by Seth H Weinberg, Leslie Tung

“…Alternans is a beat-to-beat alternation of the cardiac action potential duration (APD) or intracellular calcium (Ca(i)) transient. …”
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Beneficial Electrophysiological Effects of Rotigaptide Are Unable to Suppress Therapeutic Hypothermia-Provoked Ventricular Fibrillation in Failing Rabbit Hearts With Acute Ischemia... by Hui-Ling Lee, Po-Cheng Chang, Hung-Ta Wo, Hao-Tien Liu, Ming-Shien Wen, Ming-Shien Wen, Chung-Chuan Chou, Chung-Chuan Chou

“…Rotigaptide reduced the dispersion and beat-to-beat variability of APD and improved slowed conduction to defer the onset of arrhythmogenic SDA by dynamic pacing and elevate the pacing threshold of VF during TH. …”
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Simulation of left ventricular function during dyskinetic or akinetic aneurysm by Matjaž Sever, Samo Ribarič, Marjan Kordaš

“…This EEC model can simulate akinetic or dyskinetic LVAs of different sizes and provides realistic beat-to-beat ventricular blood flow and pressure tracings that were validated by pressure-volume loop diagrams and by published patient data. …”
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Comparison between Electrocardiographic and Earlobe Pulse Photoplethysmographic Detection for Evaluating Heart Rate Variability in Healthy Subjects in Short- and Long-Term Recordin... by Basilio Vescio, Maria Salsone, Antonio Gambardella, Aldo Quattrone

“…It is usually derived from electrocardiographic signals; however, in the last few years, photoplethysmography has been successfully used to evaluate beat-to-beat time intervals and to assess changes in the human heart rate under several conditions. …”
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Effects of spironolactone on extrasystoles and heart rate variability in haemodialysis patients: a randomised crossover trial by Michael Eklund, Olof Hellberg, Hans Furuland, Yang Cao, Erik Nilsson

“…HRV time-domain variables increased during treatment, the standard deviation of all beat-to-beat intervals by 18 (95% CI: 3.3 to 32) milliseconds (ms) and the standard deviation of the averages of beat-to-beat intervals in all 5-min segments of the entire recording by 16 (95% CI: 1.5 to 30) ms. …”
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