Computer-based Analysis of Continuous Non-invasive Blood Pressure and Heart Rate Variability - Methodology and Normal Values During Wakefulness and Sleep - Computerunterstützte Analyse von nicht-invasiv, kontinuierlich registriertem Blutdruck und Herzratenvariabilität - Methodik und Normwerte im Wach-und Schiafzustand

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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Heart rate variability enhances the accuracy of non-invasive continuous blood pressure estimation under blood loss

Review of Scientific Instruments ◽

10.1063/5.0037661 ◽

2021 ◽

Vol 92 (10) ◽

pp. 105106

Author(s):

Guang Zhang ◽

Zongge Wang ◽

Feixiang Hou ◽

Zongming Wan ◽

Feng Chen ◽

...

Keyword(s):

Blood Pressure ◽

Heart Rate ◽

Heart Rate Variability ◽

Blood Loss ◽

Non Invasive ◽

Pressure Estimation ◽

Blood Pressure Estimation ◽

Continuous Blood Pressure

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Case Report: Control of Heart Rate Variability to Cope with Stress and Pain After Colectomy

Biofeedback ◽

10.5298/1081-5937-46.3.01 ◽

2018 ◽

Vol 46 (3) ◽

pp. 60-64

Author(s):

Ann Linda Baldwin

Keyword(s):

Blood Pressure ◽

Heart Rate ◽

Heart Rate Variability ◽

Case Report ◽

Normal Values ◽

Daily Practice ◽

High Heart Rate ◽

Controlled Breathing

Colectomy is psychologically very stressful, but little information is available to help patients manage stress. The client presented with anxiety, high heart rate, and apparent arrhythmias 9 months after colectomy. After 7 weeks of daily practice of controlled breathing and positive visualization, she showed no apparent arrhythmias and felt less anxious. She then suffered a stroke and underwent ileostomy surgery, but she was soon feeling less anxious, and her blood pressure and heart rate variability resumed normal values. This case demonstrates the effectiveness of autoregulatory practices for controlling stress after colectomy.

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Cardiovascular dysautonomia in Achalasia Patients: Blood pressure and heart rate variability alterations

PLoS ONE ◽

10.1371/journal.pone.0248106 ◽

2021 ◽

Vol 16 (3) ◽

pp. e0248106

Author(s):

Ana Leonor Rivera ◽

Bruno Estañol ◽

Julio J. Macias-Gallardo ◽

Guillermo Delgado-Garcia ◽

Ruben Fossion ◽

...

Keyword(s):

Blood Pressure ◽

Heart Rate ◽

Heart Rate Variability ◽

Ganglion Cells ◽

Thoracic Esophagus ◽

Present Contribution ◽

Non Invasive ◽

Standing Up ◽

Healthy Control ◽

Parasympathetic Ganglion

Achalasia is a disease characterized by the inability to relax the esophageal sphincter due to a degeneration of the parasympathetic ganglion cells located in the wall of the thoracic esophagus. Achalasia has been associated with extraesophageal dysmotility, suggesting alterations of the autonomic nervous system (ANS) that extend beyond the esophagus. The purpose of the present contribution is to investigate whether achalasia may be interpreted as the esophageal manifestation of a more generalized disturbance of the ANS which includes alterations of heart rate and/or blood pressure. Therefore simultaneous non-invasive records of the heart inter-beat intervals (IBI) and beat-to-beat systolic blood pressure (SBP) of 14 patients (9 female, 5 male) with achalasia were compared with the records of 34 rigorously screened healthy control subjects (17 female, 17 male) in three different conditions: supine, standing up, and controlled breathing at 0.1 Hz, using a variety of measures in the time and spectral domains. Significant differences in heart rate variability (HRV) and blood pressure variability (BPV) were observed which seem to be due to cardiovagal damage to the heart, i.e., a failure of the ANS, as expected according to our hypothesis. This non-invasive methodology can be employed as an auxiliary clinical protocol to study etiology and evolution of achalasia, and other pathologies that damage ANS.

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Non-Invasive Blood Pressure and Heart Rate Sensing Using Photoplethysmogram Sensor

2021 IEEE 17th International Colloquium on Signal Processing & Its Applications (CSPA) ◽

10.1109/cspa52141.2021.9377302 ◽

2021 ◽

Author(s):

Nur Intan Fathehah Mohd Lahil ◽

Farrah Wong ◽

Ali Chekima ◽

Sariah Abang ◽

Normah Awang Besar ◽

...

Keyword(s):

Blood Pressure ◽

Heart Rate ◽

Invasive Blood Pressure ◽

Non Invasive

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Cardiorespiratory and hemogasometric effects of epidural ketamine and its associations with morphine and xylazine in sheep

Semina Ciências Agrárias ◽

10.5433/1679-0359.2021v42n1p241 ◽

2021 ◽

Vol 42 (1) ◽

pp. 241-254

Author(s):

Ceci Ribeiro Leite ◽

◽

Fabio Otero Ascoli ◽

Juliana de Oliveira ◽

Daniel Andrews de Moura Fernandes ◽

...

Keyword(s):

Blood Pressure ◽

Heart Rate ◽

Respiratory Frequency ◽

The Other ◽

Control Treatment ◽

Invasive Blood Pressure ◽

Epidural Injections ◽

Non Invasive ◽

Model Study ◽

Lower Temperature

This study aimed to evaluate the cardiorespiratory and hemogasometric effects of epidural ketamine and its associations with morphine and xylazine in ewes submitted to transcervical cervix transposition with a hegar dilator. Ten Santa Inês breed ewes were studied in a cross over model study where three epidural protocols (GK = ketamine 2.0 mg kg-1; GKM = ketamine 2.0 mg kg-1 + morphine 0.1 mg kg-1; GKX = ketamine 2.0 mg kg-1 + xylazine 0.05 mg kg-1) were compared among each other and with a control treatment (GS= saline 1 mL/7.5 kg). The assessed variables were heart rate, respiratory frequency, ear temperature, non-invasive blood pressure and hemogasometric analysis. All parameters were assessed at baseline and then ewes were sedated with an association of acepromazine (0.1 mg kg -1) and diazepam (0.2 mg kg -1). Ten minutes after sedation all parameters were reassessed and afterwards the epidural injections were performed. Hemogasometry was repeated at 15 and 30 minutes after epidural and the other parameters assessed at 05, 15, 30, 45 and 60 minutes after epidural. GKX showed a slight respiratory depression with lower levels of PO2 and a compensatory increase in respiratory frequency. GKM presented the lower temperature mean. All protocols showed few cardiorespiratory effects when compared with control. Epidural with 2.0 mg kg-1 ketamine isolated was considered the best option for short procedures as obstetric manipulations in sheep due to its cardiorespiratory stability when compared with the protocols using associations.

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