Non-invasive real-time autonomic function characterization during surgery via continuous Poincaré quantification of heart rate variability

AbstractHeart rate variability (HRV) utilizes the electrocardiogram (ECG) and has been widely studied as a non-invasive indicator of cardiac autonomic activity. Pulse rate variability (PRV) utilizes photoplethysmography (PPG) and recently has been used as a surrogate for HRV. Several studies have found that PRV is not entirely valid as an estimation of HRV and that several physiological factors, including the pulse transit time (PTT) and blood pressure (BP) changes, may affect PRV differently than HRV. This study aimed to assess the relationship between PRV and HRV under different BP states: hypotension, normotension, and hypertension. Using the MIMIC III database, 5 min segments of PPG and ECG signals were used to extract PRV and HRV, respectively. Several time-domain, frequency-domain, and nonlinear indices were obtained from these signals. Bland–Altman analysis, correlation analysis, and Friedman rank sum tests were used to compare HRV and PRV in each state, and PRV and HRV indices were compared among BP states using Kruskal–Wallis tests. The findings indicated that there were differences between PRV and HRV, especially in short-term and nonlinear indices, and although PRV and HRV were altered in a similar manner when there was a change in BP, PRV seemed to be more sensitive to these changes.

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Real-Time Analysis of Heart Rate Variability Patterns during Hemodialysis

2019 23rd International Computer Science and Engineering Conference (ICSEC) ◽

10.1109/icsec47112.2019.8974764 ◽

2019 ◽

Author(s):

Motoki Tanaka ◽

Yasuyuki Satoh ◽

Osamu Sakata

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Real Time ◽

Time Analysis ◽

Real Time Analysis

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Estimation of Heart Rate Variability Changes during Different Visual Stimulations Using Non-invasive Continuous ECG Monitoring System

2009 International Joint Conference on Bioinformatics, Systems Biology and Intelligent Computing ◽

10.1109/ijcbs.2009.75 ◽

2009 ◽

Cited By ~ 2

Author(s):

Wanqing Wu ◽

Jungtae Lee ◽

Haifeng Chen

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Monitoring System ◽

Ecg Monitoring ◽

Non Invasive

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Reponse to ‘Estimating the autonomic function from heart rate variability in mechanically ventilated patients after spinal cord injury’

Spinal Cord ◽

10.1038/sc.2015.98 ◽

2015 ◽

Vol 53 (11) ◽

pp. 839-840

Author(s):

L Malmqvist ◽

T Biering-Sørensen ◽

K Bartholdy ◽

A Krassioukov ◽

K-L Welling ◽

...

Keyword(s):

Spinal Cord ◽

Heart Rate ◽

Spinal Cord Injury ◽

Heart Rate Variability ◽

Autonomic Function ◽

Mechanically Ventilated ◽

Mechanically Ventilated Patients ◽

Cord Injury ◽

Ventilated Patients

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Trends in Heart Rate and Heart Rate Variability during Pregnancy and Three Months Postpartum: Continuous Monitoring in a Free-Living Context (Preprint)

10.2196/preprints.33458 ◽

2021 ◽

Author(s):

Fatemeh Sarhaddi ◽

Iman Azimi ◽

Anna Axelin ◽

Hannakaisa Niela-Vilen ◽

Pasi Liljeberg ◽

...

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Pregnant Women ◽

Time Domain ◽

Second Trimester ◽

Third Trimester ◽

Non Invasive ◽

The Third ◽

Invasive Method ◽

Frequency Power

BACKGROUND Heart rate variability (HRV) is a non-invasive method reflecting autonomic nervous system (ANS) regulations. Altered HRV is associated with adverse mental or physical health complications. ANS also has a central role in physiological adaption during pregnancy causing normal changes in HRV. OBJECTIVE Assessing trends in heart rate (HR) and HRV parameters as a non-invasive method for remote maternal health monitoring during pregnancy and three months postpartum. METHODS Fifty-eight pregnant women were monitored using an Internet-of-Things (IoT)-based remote monitoring system during pregnancy and 3-months postpartum. Pregnant women were asked to continuously wear Gear sport smartwatch to monitor their HR and HRV. In addition, a cross-platform mobile application was utilized for collecting pregnancy-related information. The trends of HR and HRV parameters were extracted using reliable data. We also analyzed the trends of normalized HRV parameters based on HR to remove the effect of HR changes on HRV trends. Finally, we exploited hierarchical linear mixed models to analyze the trends of HR, HRV, and normalized HRV parameters. RESULTS HR increased significantly during the second trimester (P<.001) and decreased significantly during the third trimester (P<.01). Time-domain HRV parameters, average normal interbeat intervals (AVNN), standard deviation of normal interbeat intervals (SDNN), root mean square of the successive difference of normal interbeat intervals (RMSSD), normalized SDNN (nSDNN), and normalized RMSSD (nRMSSD) decreased significantly during the second trimester (P<.001) then increased significantly during the third trimester (P<.01). Some of the frequency domain parameters, low-frequency power (LF), high-frequency power (HF), and normalized HF (nHF) decreased significantly during the second trimester (P<.01), and HF increased significantly during the third trimester (P<.01). In the postpartum period, nRMSSD decreased (P<.05), and the LF to HF ratio (LF/HF) increased significantly (P<.01). CONCLUSIONS Our study showed that HR increased and HRV parameters decreased as the pregnancy proceeded, and the values returned to normal after the delivery. Moreover, our results show that HR started to decrease while time-domain HRV parameters and HF started to increase during the third trimester. Our results also demonstrate the possibility of continuous HRV monitoring in everyday life settings.

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HEART RATE VARIABILITY RELATED TO N95 RESPIRATOR USE IN INTERNS DURING COVID-19 PANDEMIC

10.36106/ijsr/4308359 ◽

2021 ◽

pp. 69-70

Author(s):

Pakanati Sujana ◽

Venkata Mahesh Gandhavalla ◽

K. Prabhakara Rao

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Low Frequency ◽

Protective Equipment ◽

Short Term ◽

Non Invasive ◽

Critical Components ◽

The Individual ◽

N95 Respirators ◽

Respiratory Droplets

Introduction: COVID19 is caused by SARS-CoV-2 which is primarily transmitted through respiratory droplets and contact routes. WHO recommended the use of personal protective equipment (PPE) for prevention and N95 respirators are critical components of PPE. Breathing through N95 respirator will impart stress in the individual and that can be assessed by heart rate variability (HRV). HRV measures the variation in time between each heartbeat controlled by autonomic nervous system (ANS), which is a non invasive reliable index to identify the ANS imbalances. Aims And Objectives: This study is aimed at assessing the HRV of Interns working in COVID19 wards using N95 respirators. Methodology: This study included 100 interns in whom short term HRV was recorded using the standard protocol. Lead II of ECG was recorded using AD instruments (ADI) 8channel polygraph and HRV was analysed using Labchart 8pro software. The recordings were taken before and 1hour after wearing N95 respirator. Results: Overall HRV (SDRR) was found to decrease signicantly after wearing N95 respirator for 1hr (p=0.000). Similarly, indices representing the parasympathetic component ( RMSSD and HF ) were also found to decrease signicantly with the use of N95 respirator. Low frequency (LF) power and LF/HF ratio increased signicantly with N95 respirator use (p=0.000). Conclusion: We conclude that using N95 respirator increased sympathetic activity reecting decreased HRV in our subjects Hence we recommend that it is better to change the duty pattern for interns.

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