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Article ; Online: Multimodal pathophysiological dataset of gradual cerebral ischemia in a cohort of juvenile pigs.

Frasch, Martin G / Walter, Bernd / Herry, Christophe L / Bauer, Reinhard

2021 Volume 8, Issue 1, Page(s) 4

Abstract: Ischemic brain injuries are frequent and difficult to detect reliably or early. We present the multi-modal data set containing cardiovascular (blood pressure, blood flow, electrocardiogram) and brain electrical activities to derive electroencephalogram ( ... ...

Abstract	Ischemic brain injuries are frequent and difficult to detect reliably or early. We present the multi-modal data set containing cardiovascular (blood pressure, blood flow, electrocardiogram) and brain electrical activities to derive electroencephalogram (EEG) biomarkers of corticothalamic communication under normal, sedation, and hypoxic/ischemic conditions with ensuing recovery. We provide technical validation using EEGLAB. We also delineate the corresponding changes in the electrocardiogram (ECG)-derived heart rate variability (HRV) with the potential for future in-depth analyses of joint EEG-ECG dynamics. We review an open-source methodology to derive signatures of coupling between the ECoG and electrothalamogram (EThG) signals contained in the presented data set to better characterize the dynamics of thalamocortical communication during these clinically relevant states. The data set is presented in full band sampled at 2000 Hz, so the additional potential exists for insights from the full-band EEG and high-frequency oscillations under the bespoke experimental conditions. Future studies on the dataset may contribute to the development of new brain monitoring technologies, which will facilitate the prevention of neurological injuries.
MeSH term(s)	Animals ; Blood Pressure ; Brain/physiopathology ; Brain Ischemia/physiopathology ; Electrocardiography ; Electroencephalography ; Heart Rate ; Regional Blood Flow ; Swine
Language	English
Publishing date	2021-01-07
Publishing country	England
Document type	Dataset ; Journal Article
ZDB-ID	2775191-0
ISSN	2052-4463 ; 2052-4463
ISSN (online)	2052-4463
ISSN	2052-4463
DOI	10.1038/s41597-020-00781-y
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Article: Fetal Cardiovascular Decompensation During Labor Predicted From the Individual Heart Rate Tracing: A Machine Learning Approach in Near-Term Fetal Sheep Model.

Gold, Nathan / Herry, Christophe L / Wang, Xiaogang / Frasch, Martin G

Frontiers in pediatrics

2021 Volume 9, Page(s) 593889

Abstract: Background: ...

Abstract	Background:
Language	English
Publishing date	2021-05-05
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2711999-3
ISSN	2296-2360
ISSN	2296-2360
DOI	10.3389/fped.2021.593889
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Article ; Online: Economic feasibility of a novel tool to assist extubation decision-making: an early health economic modeling.

Zheng, Katina / Kumar, Srishti / Sarti, Aimee J / Herry, Christophe L / Seely, Andrew J E / Thavorn, Kednapa

International journal of technology assessment in health care

2022 Volume 38, Issue 1, Page(s) e66

Abstract: Objectives: To estimate the minimum percent change in failed extubation to make a tool designed to reduce extubation failure (Extubation Advisor [EA]) economically viable.: Methods: We conducted an early return on investment (ROI) analysis using data ...

Abstract	Objectives: To estimate the minimum percent change in failed extubation to make a tool designed to reduce extubation failure (Extubation Advisor [EA]) economically viable. Methods: We conducted an early return on investment (ROI) analysis using data from intubated intensive care unit (ICU) patients at a large Canadian tertiary care hospital. We obtained input parameters from the hospital database and published literature. We ran generalized linear models to estimate the attributable length of stay, total hospital cost, and time to subsequent extubation attempt following failure. We developed a Markov model to estimate the expected ROI and performed probabilistic sensitivity analyses to assess the robustness of findings. Costs were presented in 2020 Canadian dollars (C$). Results: The model estimated a 1 percent reduction in failed extubation could save the hospital C$289 per intubated patient (95 percent CI: 197, 459). A large center seeing 2,500 intubated ICU patients per year could save C$723,124/year/percent reduction in failed extubation. At the current annual price of C$164,221, the EA tool must reduce extubation failure by at least 0.24 percent (95 percent CI: .14, .41) to make the tool cost-effective at our site. Conclusions: Clinical decision-support tools like the EA may play an important role in reducing healthcare costs by reducing the rate of extubation failure, a costly event in the ICU.
MeSH term(s)	Airway Extubation ; Canada ; Feasibility Studies ; Humans ; Intensive Care Units ; Length of Stay ; Respiration, Artificial ; Ventilator Weaning
Language	English
Publishing date	2022-07-11
Publishing country	England
Document type	Journal Article
ZDB-ID	632573-7
ISSN	1471-6348 ; 0266-4623
ISSN (online)	1471-6348
ISSN	0266-4623
DOI	10.1017/S0266462322000472
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Article ; Online: Cardiac autonomic modulation in individuals with controlled and uncomplicated hypertension during exercise-heat stress.

Carrillo, Andres E / Akerman, Ashley P / Notley, Sean R / Herry, Christophe L / Seely, Andrew J E / Ruzicka, Marcel / Boulay, Pierre / Kenny, Glen P

Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme

2023 Volume 48, Issue 11, Page(s) 863–869

Abstract: Take-home message: During short bouts of light-to-vigorous exercise in the heat, controlled and uncomplicated hypertension did not significantly modulate HRV in physically active individuals. These findings can be used to refine guidance on use of ... ...

Abstract	Take-home message: During short bouts of light-to-vigorous exercise in the heat, controlled and uncomplicated hypertension did not significantly modulate HRV in physically active individuals. These findings can be used to refine guidance on use of exercise for hypertension management in the heat.
MeSH term(s)	Humans ; Heart Rate ; Heart ; Hypertension/therapy ; Autonomic Nervous System ; Heat-Shock Response ; Heat Stress Disorders
Language	English
Publishing date	2023-08-09
Publishing country	Canada
Document type	Journal Article
ZDB-ID	2236708-1
ISSN	1715-5320 ; 1715-5312
ISSN (online)	1715-5320
ISSN	1715-5312
DOI	10.1139/apnm-2023-0173
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Article ; Online: First evidence that intrinsic fetal heart rate variability exists and is affected by hypoxic pregnancy.

Frasch, Martin G / Herry, Christophe L / Niu, Youguo / Giussani, Dino A

The Journal of physiology

2020 Volume 598, Issue 2, Page(s) 249–263

Abstract: Key points: We introduce a technique to test whether intrinsic fetal heart rate variability (iFHRV) exists and we show the utility of the technique by testing the hypothesis that iFHRV is affected by chronic fetal hypoxia, one of the most common adverse ...

Abstract	Key points: We introduce a technique to test whether intrinsic fetal heart rate variability (iFHRV) exists and we show the utility of the technique by testing the hypothesis that iFHRV is affected by chronic fetal hypoxia, one of the most common adverse outcomes of human pregnancy complicated by fetal growth restriction. Using an established late gestation ovine model of fetal development under chronic hypoxic conditions, we identify iFHRV in isolated fetal hearts and show that it is markedly affected by hypoxic pregnancy. Therefore, the isolated fetal heart has intrinsic variability and carries a memory of adverse intrauterine conditions experienced during the last third of pregnancy. Abstract: Fetal heart rate variability (FHRV) emerges from influences of the autonomic nervous system, fetal body and breathing movements, and from baroreflex and circadian processes. We tested whether intrinsic heart rate variability (iHRV), devoid of any external influences, exists in the fetal period and whether it is affected by chronic fetal hypoxia. Chronically catheterized ewes carrying male singleton fetuses were exposed to normoxia (n = 6) or hypoxia (10% inspired O
MeSH term(s)	Animals ; Female ; Fetal Heart/physiopathology ; Fetal Hypoxia/physiopathology ; Heart Rate, Fetal ; Male ; Pregnancy ; Pregnancy Complications/physiopathology ; Sheep
Language	English
Publishing date	2020-01-09
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	3115-x
ISSN	1469-7793 ; 0022-3751
ISSN (online)	1469-7793
ISSN	0022-3751
DOI	10.1113/JP278773
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Article ; Online: Machine learning model on heart rate variability metrics identifies asymptomatic toddlers exposed to zika virus during pregnancy.

Herry, Christophe L / Soares, Helena M F / Schuler-Faccini, Lavinia / Frasch, Martin G

Physiological measurement

2021 Volume 42, Issue 5

Abstract: ... ...

Abstract	Objective
MeSH term(s)	Benchmarking ; Brazil ; Child, Preschool ; Female ; Heart Rate ; Humans ; Infant ; Machine Learning ; Pregnancy ; Pregnancy Complications, Infectious/diagnosis ; Zika Virus ; Zika Virus Infection/diagnosis
Language	English
Publishing date	2021-06-17
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1149545-5
ISSN	1361-6579 ; 0967-3334
ISSN (online)	1361-6579
ISSN	0967-3334
DOI	10.1088/1361-6579/ac010e
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Article ; Online: Predicting Time to Death After Withdrawal of Life-Sustaining Measures Using Vital Sign Variability: Derivation and Validation.

Scales, Nathan B / Herry, Christophe L / van Beinum, Amanda / Hogue, Melanie L / Hornby, Laura / Shahin, Jason / Dhanani, Sonny / Seely, Andrew J E

Critical care explorations

2022 Volume 4, Issue 4, Page(s) e0675

Abstract: To develop a predictive model using vital sign (heart rate and arterial blood pressure) variability to predict time to death after withdrawal of life-supporting measures.: Design: Retrospective analysis of observational data prospectively collected as ...

Abstract	To develop a predictive model using vital sign (heart rate and arterial blood pressure) variability to predict time to death after withdrawal of life-supporting measures. Design: Retrospective analysis of observational data prospectively collected as part of the Death Prediction and Physiology after Removal of Therapy study between May 1, 2014, and May 1, 2018. Setting: Adult ICU. Patients: Adult patients in the ICU with a planned withdrawal of life-supporting measures and an expectation of imminent death. Interventions: None. Measurements and main results: Vital sign waveforms and clinical data were prospectively collected from 429 patients enrolled from 20 ICUs across Canada, the Czech Republic, and the Netherlands. Vital sign variability metrics were calculated during the hour prior to withdrawal. Patients were randomly assigned to the derivation cohort (288 patients) or the validation cohort (141 patients), of which 103 and 54, respectively, were eligible for organ donation after circulatory death. Random survival forest models were developed to predict the probability of death within 30, 60, and 120 minutes following withdrawal using variability metrics, features from existing clinical models, and/or the physician's prediction of rapid death. A model employing variability metrics alone performed similarly to a model employing clinical features, whereas the combination of variability, clinical features, and physician's prediction achieved the highest area under the receiver operating characteristics curve of all models at 0.78 (0.7-0.86), 0.79 (0.71-0.87), and 0.8 (0.72-0.88) for 30-, 60- and 120-minute predictions, respectively. Conclusions: Machine learning models of vital sign variability data before withdrawal of life-sustaining measures, combined with clinical features and the physician's prediction, are useful to predict time to death. The impact of providing this information for decision support for organ donation merits further investigation.
Language	English
Publishing date	2022-04-07
Publishing country	United States
Document type	Journal Article
ISSN	2639-8028
ISSN (online)	2639-8028
DOI	10.1097/CCE.0000000000000675
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Article ; Online: Effects of sex and wet-bulb globe temperature on heart rate variability during prolonged moderate-intensity exercise: a secondary analysis.

De Barros, Jordan A / Macartney, Michael J / Peoples, Gregory E / Notley, Sean R / Herry, Christophe L / Kenny, Glen P

Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme

2022 Volume 47, Issue 7, Page(s) 725–736

Abstract: Sex differences in heart rate (HR) and heart rate variability (HRV), a surrogate of cardiac autonomic modulation, are evident during rest and exercise in young healthy individuals. However, it remains unclear whether sex impacts HRV during prolonged ... ...

Abstract	Sex differences in heart rate (HR) and heart rate variability (HRV), a surrogate of cardiac autonomic modulation, are evident during rest and exercise in young healthy individuals. However, it remains unclear whether sex impacts HRV during prolonged exercise at differing levels of environmental heat stress. Therefore, we completed a secondary analysis upon the effects of sex and wet-bulb globe temperature (WBGT) on HR and HRV during prolonged exercise. To achieve this, HR and HRV were assessed in non-endurance-trained and non-heat-acclimatised healthy men (
MeSH term(s)	Autonomic Nervous System ; Exercise/physiology ; Female ; Heart Rate/physiology ; Heat Stress Disorders ; Hot Temperature ; Humans ; Male ; Temperature
Language	English
Publishing date	2022-03-15
Publishing country	Canada
Document type	Journal Article
ZDB-ID	2236708-1
ISSN	1715-5320 ; 1715-5312
ISSN (online)	1715-5320
ISSN	1715-5312
DOI	10.1139/apnm-2022-0004
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Article ; Online: Exploring the Effects of Yoga Therapy on Heart Rate Variability and Patient-Reported Outcomes After Cancer Treatment: A Study Protocol.

Brunet, Jennifer / Wurz, Amanda / Hussien, Julia / Pitman, Anne / Conte, Ellen / Ennis, Julie K / Herry, Christophe L / Seely, Andrew J E / Seely, Dugald

Integrative cancer therapies

2022 Volume 21, Page(s) 15347354221075576

Abstract: Background: Following cancer treatment, adults commonly report worsened patient-reported outcomes (PROs) such as anxiety, stress, depression, persistent and upsetting cognitive complaints, unrelenting fatigue, and reduced quality of life. Poorer PROs ... ...

Abstract	Background: Following cancer treatment, adults commonly report worsened patient-reported outcomes (PROs) such as anxiety, stress, depression, persistent and upsetting cognitive complaints, unrelenting fatigue, and reduced quality of life. Poorer PROs are associated with disrupted autonomic nervous system functioning as measured by heart rate variability (HRV), both of which have been associated with greater morbidity and mortality. Interventions to improve HRV and PROs among adults following cancer treatment are needed. Yoga therapy holds promise as an intervention to improve HRV and PROs. Therefore, we conducted a single-subject exploratory experimental study to investigate the effects of yoga therapy on HRV and specific PROs (ie, cancer-related fatigue, anxiety, cognitive function, depression, stress, quality of life) in adults treated for cancer. To reduce publication bias, improve reproducibility, and serve as a reference for forthcoming reporting of study results, we present the study protocol for this study herein. Methods: Participants were adults who completed cancer treatment that were recruited from the Ottawa Integrative Cancer Centre. Consenting and eligible participants received one 1:1 yoga therapy session (ie, 1 participant, 1 Yoga Therapist) and 6 weekly group-based yoga therapy sessions (ie, 2-3 participants, 1 Yoga Therapist). Participants completed assessments 7 times: 3 times prior to the program (ie, -6 weeks, -3 weeks, immediately prior to the 1:1 yoga therapy session), immediately following the 1:1 yoga therapy session, prior to the first group-based yoga therapy session, after the last group-based yoga therapy session, and at a 6-week follow-up. Hierarchical linear modeling will be used to test the average effects of the yoga therapy program across participants. Discussion: This study will explore several novel hypotheses, including whether yoga therapy can improve HRV and/or specific PROs among adults treated for cancer acutely (ie, during a 1:1 yoga therapy session) and/or through repeated exposure (ie, after completing 6 weeks of group-based yoga therapy). Although the findings will require confirmation or refutation in future trials, they may provide initial evidence that YT may benefit adults treated for cancer. Trial registration: ISRCTN registry, ISRCTN64763228. Registered on December 12, 2021. This trial was registered retrospectively. URL of trial registry record: https://www.isrctn.com/ISRCTN64763228.
MeSH term(s)	Adult ; Fatigue ; Heart Rate/physiology ; Humans ; Neoplasms/therapy ; Patient Reported Outcome Measures ; Quality of Life ; Reproducibility of Results ; Retrospective Studies ; Yoga/psychology
Language	English
Publishing date	2022-04-08
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2182320-0
ISSN	1552-695X ; 1534-7354
ISSN (online)	1552-695X
ISSN	1534-7354
DOI	10.1177/15347354221075576
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Article ; Online: The impact of age, type 2 diabetes and hypertension on heart rate variability during rest and exercise at increasing levels of heat stress.

De Barros, Jordan A / Macartney, Michael J / Peoples, Gregory E / Notley, Sean R / Herry, Christophe L / Kenny, Glen P

European journal of applied physiology

2022 Volume 122, Issue 5, Page(s) 1249–1259

Abstract: Purpose: In older adults with type 2 diabetes (T2D) and hypertension (HTN), cardiac autonomic modulation is markedly attenuated during exercise-heat stress. However, the extent to which this impairment is evident under increasing levels of heat stress ... ...

Abstract	Purpose: In older adults with type 2 diabetes (T2D) and hypertension (HTN), cardiac autonomic modulation is markedly attenuated during exercise-heat stress. However, the extent to which this impairment is evident under increasing levels of heat stress remains unknown. Methods: We examined heart rate variability (HRV), a surrogate of cardiac autonomic modulation, during incremental exercise-heat stress exposures in young (20-30 years) and middle-aged-to-older individuals (50-70 years) without and with T2D and HTN. Thirteen young and healthy (Young, n = 13) and 37 older men without (Older, n = 14) and with HTN (n = 13) or T2D (n = 10) performed 180-min treadmill walking at a fixed metabolic rate (~ 200 W/m Results: Ageing did not significantly reduce HRV during increasing exercise-heat stress (all p > 0.050). However, T2D and HTN modified HRV during exercise-heat stress such that Detrended Fluctuation Analysis (DFA) α Conclusion: Our unique observations indicate that, relative to their younger counterparts, HRV in healthy older individuals is not perturbed during exercise heat-stress. However, relative to their age-matched healthy counterparts, HRV is reduced during exercise-heat stress in individuals with age-associated chronic conditions, indicative of cardiac autonomic dysfunction.
MeSH term(s)	Aged ; Diabetes Mellitus, Type 2 ; Heart Rate/physiology ; Heat Stress Disorders ; Heat-Shock Response/physiology ; Humans ; Hypertension ; Male ; Middle Aged
Language	English
Publishing date	2022-03-03
Publishing country	Germany
Document type	Journal Article
ZDB-ID	124793-1
ISSN	1439-6327 ; 1432-1025 ; 0301-5548 ; 1439-6319
ISSN (online)	1439-6327 ; 1432-1025
ISSN	0301-5548 ; 1439-6319
DOI	10.1007/s00421-022-04916-4
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