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cardiorespiratory coherence

Gaspard Montandon, Sharon L Cushing, Fiona Campbell, Evan J Propst, Richard L Horner, Indra Narang
BACKGROUND: Opioid analgesia is an essential component of perioperative care, but effective analgesia can be limited by excessive sedation and respiratory depression. The cortical signatures associated with sedation by opioids and the relationship between changes in cortical activity and respiratory function are not well understood. The objectives of this study were to identify the electroencephalogram signatures of sedation and respiratory changes induced by morphine in a pediatric population after elective surgery...
November 2016: Anesthesiology
I M Carey, H R Anderson, R W Atkinson, S Beevers, D G Cook, D Dajnak, J Gulliver, F J Kelly
OBJECTIVES: The epidemiological evidence for adverse health effects of long-term exposure to air and noise pollution from traffic is not coherent. Further, the relative roles of background versus near traffic pollution concentrations in this process are unclear. We investigated relationships between modelled concentrations of air and noise pollution from traffic and incident cardiorespiratory disease in London. METHODS: Among 211 016 adults aged 40-79 years registered in 75 Greater London practices between 2005 and 2011, the first diagnosis for a range of cardiovascular and respiratory outcomes were identified from primary care and hospital records...
June 24, 2016: Occupational and Environmental Medicine
Zhengbo Zhang, Buqing Wang, Hao Wu, Xiaoke Chai, Weidong Wang, Chung-Kang Peng
Investigation of the interaction between cardiovascular variables and respiration provides a quantitative and noninvasive approach to assess the autonomic control of cardiovascular function. The aim of this paper is to investigate the changes of cardiopulmonary coupling (CPC), blood pressure (BP) and pulse transit time (PTT) during a stepwise-paced breathing (SPB) procedure (spontaneous breathing followed by paced breathing at 14, 12.5, 11, 9.5, 8 and 7 breaths per minute, 3 min each) and gain insights into the characteristics of slow breathing exercises...
May 18, 2016: Medical & Biological Engineering & Computing
Kyuichi Niizeki, Tadashi Saitoh
The present study analyzed whether the phase coherency (λ) of respiratory sinus arrhythmia (RSA) is altered by food ingestion in healthy young subjects. After 5min of resting control, 13 healthy volunteers were asked to eat a solid meal with access to water at their own pace, followed by 5min of the postprandial state. The R-R interval (RRI), beat-to-beat blood pressure (BP), and respiratory activity were recorded using electrocardiography, a Finapres device, and inductance plethysmography, respectively. The stroke volume was calculated by the pulse-contour method from continuous BP measurement, and the cardiac output (CO) was obtained by multiplying the stroke volume by the heart rate...
May 15, 2016: Physiology & Behavior
M A Vyzhigina, V D Parshin, V A Titov, A V Alekseev
The problem of efficient gas exchange maintenance is always actual in anesthetic management of thoracic surgery and determines the selection of appropriate method of anesthesia. The article presents an experience of anesthesia during operations on lungs, trachea, bronchi and mediastinal structures performed from 1963 to 2015. Current concept of safety and efficacy of anesthetic management in thoracic surgery is presented. The role of actual current respiratory technologies and methods of anesthesia per se to maximize the efficiency of gas exchange in all stages of thoracicsurgery is emphasized...
2015: Khirurgiia
S Schulz, J Haueisen, K J Bar, A Voss
Schizophrenia is referred to as one of the most severe mental disorders in the world, and patients with this condition are associated with high cardiac mortality rates. However, the reasons for this high mortality rates are still under debate. One major contributing factor seems to be that a dysfunction of the autonomic nervous system (ANS) is evident in schizophrenia. Thereby, recent investigations focused on the analyses of respiration and cardiorespiratory coupling (CRC) in these patients.The objective of this study was to characterize the causal strength and direction of CRC applying the normalized short time partial directed coherence (NSTPDC) approach in healthy subjects (CON)...
August 2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Ravinder Jerath, Molly W Crawford
The brain is considered to be the primary generator and regulator of emotions; however, afferent signals originating throughout the body are detected by the autonomic nervous system (ANS) and brainstem, and, in turn, can modulate emotional processes. During stress and negative emotional states, levels of cardiorespiratory coherence (CRC) decrease, and a shift occurs toward sympathetic dominance. In contrast, CRC levels increase during more positive emotional states, and a shift occurs toward parasympathetic dominance...
2015: Advances in Mind-body Medicine
D A Kenwright, A Bernjak, T Draegni, S Dzeroski, M Entwistle, M Horvat, P Kvandal, S A Landsverk, P V E McClintock, B Musizza, J Petrovčič, J Raeder, L W Sheppard, A F Smith, T Stankovski, A Stefanovska
Depth of anaesthesia monitors usually analyse cerebral function with or without other physiological signals; non-invasive monitoring of the measured cardiorespiratory signals alone would offer a simple, practical alternative. We aimed to investigate whether such signals, analysed with novel, non-linear dynamic methods, would distinguish between the awake and anaesthetised states. We recorded ECG, respiration, skin temperature, pulse and skin conductivity before and during general anaesthesia in 27 subjects in good cardiovascular health, randomly allocated to receive propofol or sevoflurane...
December 2015: Anaesthesia
T Deliens, B Deforche, I De Bourdeaudhuij, P Clarys
BACKGROUND/OBJECTIVES: This study examined changes in Belgian students' weight, body composition and physical fitness after 1.5 years at university. Furthermore, this study investigated whether these changes differed by gender and weight status. SUBJECTS/METHODS: In this longitudinal study, 172 students' weight, body mass index (BMI) and waist circumference (WC) were objectively measured, whereas fat%, fat mass, fat-free mass, dynamic leg strength, handgrip strength, hamstring flexibility and cardiorespiratory fitness were estimated using validated instruments...
December 2015: European Journal of Clinical Nutrition
A Garde, B F Giraldo, R Jané, T D Latshang, A J Turk, T Hess, M M Bosch, D Barthelmes, T M Merz, J Pichler Hefti, O D Schoch, K E Bloch
This work investigates the performance of cardiorespiratory analysis detecting periodic breathing (PB) in chest wall recordings in mountaineers climbing to extreme altitude. The breathing patterns of 34 mountaineers were monitored unobtrusively by inductance plethysmography, ECG and pulse oximetry using a portable recorder during climbs at altitudes between 4497 and 7546 m on Mt. Muztagh Ata. The minute ventilation (VE) and heart rate (HR) signals were studied, to identify visually scored PB, applying time-varying spectral, coherence and entropy analysis...
August 2015: Medical & Biological Engineering & Computing
Kenta Yamamoto, Peter Lalley, Steve Mifflin
Acute intermittent hypoxia (AIH) induces sympathetic and phrenic long-term facilitation (LTF), defined as a sustained increase in nerve discharge. We investigated the effects of AIH and acute intermittent optogenetic (AIO) stimulation of neurons labeled with AAV-CaMKIIa, hChR2(H134R), and mCherry in the nucleus of the solitary tract (NTS) of anesthetized, vagotomized, and mechanically ventilated rats. We measured renal sympathetic nerve activity (RSNA), phrenic nerve activity (PNA), power spectral density, and coherence, and we made cross-correlation measurements to determine how AIO stimulation and AIH affected synchronization between PNA and RSNA...
February 15, 2015: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
R Trimer, R Cabidu, L L M Sampaio, R Stirbulov, D Poiares, S Guizilini, A M Bianchi, F S M Costa, R G Mendes, A Delfino, R Arena, A Borghi-Silva
INTRODUCTION: Aging is known to be a major contributing factor to the increased risk of obstructive sleep apnea (OSA). With aging, breathing undergoes significant changes during sleep, increasing the prevalence of apnea events, which affects heart rate variability (HRV) and cardiorespiratory coupling (CRC). OBJECTIVES: To compare HRV and CRC during wakefulness and sleep between young and elderly patients with and without OSA; and to determine whether the presence of OSA in young and elderly patients has a different impact on HRV and CRC during sleep...
November 2014: Sleep Medicine
Regina Katharina Studer, Brigitta Danuser, Horst Hildebrandt, Marc Arial, Pascal Wild, Patrick Gomez
OBJECTIVES AND METHODS: Self-report studies have shown an association between music performance anxiety (MPA) and hyperventilation complaints. However, hyperventilation was never assessed physiologically in MPA. This study investigated the self-reported affective experience, self-reported physiological symptoms, and cardiorespiratory variables including partial pressure of end-tidal CO2 (PETCO2), which is an indicator for hyperventilation, in 67 music students before a private and a public performance...
July 20, 2012: Psychosomatic Medicine
Vincenzo Patruno, Eleonora Tobaldini, Anna M Bianchi, Martin O Mendez, Orietta Coletti, Giorgio Costantino, Nicola Montano
BACKGROUND: Treatment with positive airway pressure devices improved signs and symptoms of obstructive sleep apnea syndrome (OSA); however, auto-adjusting positive pressure (APAP) device was not as effective as continuous positive airway pressure (CPAP) in reducing arterial blood pressure and insulin resistance. The role played by autonomic cardiac regulation remains to be clarified. We aimed to test the effects of CPAP and APAP on autonomic regulation and cardiorespiratory coupling during sleep...
February 2014: European Journal of Internal Medicine
Chris J Brouse, Guy A Dumont, Dorothy Myers, Erin Cooke, Jonathan Stinson, Joanne Lim, J Mark Ansermino
PURPOSE: A novel real-time cardiorespiratory coherence (CRC) algorithm has been developed to monitor nociception during general anesthesia. CRC uses custom designed filters to track and analyze the respiratory sinus arrhythmia (RSA) as it moves in time and frequency. CRC is a form of sensor fusion between heart rate and respiration, estimating the strength of linear coupling between the two signals. The aim of this study was to estimate the effect of changes in respiration rate (RR) and peak airway pressure (PPaw) on CRC...
2013: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Rod K Dishman, Erica M Jackson, Yoshio Nakamura, Chester A Ray
The study examined whether cardiorespiratory fitness modifies cardiovascular responses by normotensive men and women during the Stroop color-word interference test. Independent of age and an estimate of body fatness, fitness level was positively related (R²  = .39 and .51) to increases in limb blood flow and vascular conductance, coherent with cardiac-vagal withdrawal and a decrease in heart period, among women but not men. Fitness was unrelated to changes in systolic and diastolic blood pressures and muscle sympathetic nerve activity...
September 2013: Psychophysiology
Per Kvandal, Lawrence Sheppard, Svein A Landsverk, Aneta Stefanovska, Knut A Kirkeboen
The objective of the study was to evaluate the wavelet spectral energy of oscillations in the intracranial pressure (ICP) signal in patients with acute traumatic brain injury (TBI). The wavelet phase coherence and phase shift in the 0.006-2 Hz interval between the ICP and the arterial blood pressure (ABP) signals were also investigated. Patients were separated into normal or impaired cerebrovascular reactivity, based on the pressure reactivity index (PRx). Spectral energy, phase coherence and phase shift in the low frequency and cardiorespiratory intervals were compared for the two groups...
August 2013: Journal of Clinical Monitoring and Computing
Chris J Brouse, Walter Karlen, Guy A Dumont, Dorothy Myers, Erin Cooke, Jonathan Stinson, Joanne Lim, J Mark Ansermino
A novel wavelet transform cardiorespiratory coherence (WTCRC) algorithm has been developed to measure the autonomic state. WTCRC may be used as a nociception index, ranging from 0 (no nociception, strong coherence) to 100 (strong nociception, low coherence). The aim of this study is to estimate the sensitivity of the algorithm to nociception (dental dam insertions) and antinociception (bolus doses of anesthetic drugs). WTCRC's sensitivity is compared to mean heart rate (HRmean) and mean non-invasive blood pressure (NIBPmean), which are commonly used clinical signs...
October 2013: Journal of Clinical Monitoring and Computing
Philippe Boudreau, Chris J Brouse, Guy A Dumont, Diane B Boivin
The risk of adverse cardiovascular events is elevated in the morning compared to the rest of the day. A circadian and a sleep-wake dependent variation in the regulation of the cardiovascular system could contribute to this increased cardiovascular risk. Using an ultradian sleep-wake cycle (USW) procedure, our aim was to explore the effects of the sleep-wake and circadian cycles on cardiorespiratory coherence (CRC) as a measure of autonomic nervous system (ANS) state. Our results suggest a shift toward parasympathetic dominance with deepening of sleep...
2012: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Chris J Brouse, Walter Karlen, Guy A Dumont, Dorothy Myers, Erin Cooke, Jonathan Stinson, Joanne Lim, J Mark Ansermino
Heart rate variability (HRV) may provide anesthesiologists with a noninvasive tool for monitoring nociception during general anesthesia. A novel real-time cardiorespiratory coherence (CRC) algorithm has been developed to analyze the strength of linear coupling between heart rate (HR) and respiration. CRC values range from 0 (low coherence, strong nociception) to 1 (high coherence, no nociception). The algorithm uses specially designed filters to operate in real-time, minimizing computational complexity and time delay...
2012: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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