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https://www.readbyqxmd.com/read/28339589/the-clinical-value-of-t-wave-alternans-derived-from-holter-monitoring
#1
Joanna Lewek, Pawel Ptaszynski, Thomas Klingenheben, Iwona Cygankiewicz
Microvolt-level T-wave alternans (TWA) assessed by spectral method during an exercise stress test has been widely studied for risk stratification. Several studies have documented the association of a positive TWA with total mortality and arrhythmic events. Nevertheless, the need to achieve an elevated and stabilized heart rate resulting in a considerable proportion of indeterminate test results constitutes one of the main limitations of this method. It is well recognized that arrhythmic events may be triggered not only by physical but also by mental stress and are not necessarily associated with exercise...
October 6, 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28314849/prognostic-implications-of-nonsustained-ventricular-tachycardia-in-high-risk-patients-with-hypertrophic-cardiomyopathy
#2
Weijia Wang, Zhesi Lian, Ethan J Rowin, Barry J Maron, Martin S Maron, Mark S Link
BACKGROUND: The prognostic significance of nonsustained ventricular tachycardia (NSVT) in patients with hypertrophic cardiomyopathy is incompletely resolved. METHODS AND RESULTS: The study group comprised 160 patients with implantable cardioverter defibrillators (ICDs), of whom 94 patients had 24- to 48-hour ambulatory monitoring preimplant. ICDs were interrogated and ambulatory ECGs monitored for NSVT episodes, with associations between NSVT- and ICD-treated ventricular arrhythmias examined...
March 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28290487/cardiac-autonomic-alteration-and-metabolic-syndrome-an-ambulatory-ecg-based-study-in-a-general-population
#3
Yan Ma, Ping-Huei Tseng, Andrew Ahn, Ming-Shiang Wu, Yi-Lwun Ho, Ming-Fong Chen, Chung-Kang Peng
Metabolic syndrome (MetS) has been associated with chronic damage to the cardiovascular system. This study aimed to evaluate early stage cardiac autonomic dysfunction with electrocardiography (ECG)-based measures in MetS subjects. During 2012-2013, 175 subjects with MetS and 226 healthy controls underwent ECG recordings of at least 4 hours starting in the morning with ambulatory one-lead ECG monitors. MetS was diagnosed using the criteria defined in the Adult Treatment Panel III, with a modification of waist circumference for Asians...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28269566/dual-modality-arterial-pulse-monitoring-system-for-continuous-blood-pressure-measurement
#4
Wen-Xuan Dai, Yuan-Ting Zhang, Jing Liu, Xiao-Rong Ding, Ni Zhao
Accurate and ambulatory measurement of blood pressure (BP) is essential for efficient diagnosis, management and prevention of cardiovascular diseases (CVDs). However, traditional cuff-based BP measurement methods provide only intermittent BP readings and can cause discomfort with the occlusive cuff. Although pulse transit time (PTT) method is promising for cuffless and continuous BP measurement, its pervasive use is restricted by its limited accuracy and requirement of placing sensors on multiple body sites...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269032/monitoring-and-detecting-atrial-fibrillation-using-wearable-technology
#5
Shamim Nemati, Mohammad M Ghassemi, Vaidehi Ambai, Nino Isakadze, Oleksiy Levantsevych, Amit Shah, Gari D Clifford
Atrial fibrillation (AFib) is diagnosed by analysis of the morphological and rhythmic properties of the electrocardiogram. It was recently shown that accurate detection of AFib is possible using beat-to-beat interval variations. This raises the question of whether AFib detection can be performed using a pulsatile waveform such as the Photoplethysmogram (PPG). The recent explosion in use of recreational and professional ambulatory wrist-based pulse monitoring devices means that an accurate pulse-based AFib screening algorithm would enable large scale screening for silent or undiagnosed AFib, a significant risk factor for multiple diseases...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269030/assessment-of-pre-ejection-period-in-ambulatory-subjects-using-seismocardiogram-in-a-wearable-blood-pressure-monitor
#6
Guanqun Zhang, Amber C Cottrell, Isaac C Henry, Devin B McCombie
The ability to monitor arterial blood pressure continuously with unobtrusive body worn sensors may provide a unique and potentially valuable assessment of a patient's cardiovascular health. Pulse wave velocity (PWV) offers an attractive method to continuously monitoring blood pressure. However, PWV technologies based on timing measurements between the ECG and a distal PPG suffer from inaccuracies on mobile patients due to the confounding influence of pre-ejection period (PEP). In this paper, we presented a wearable, continuous blood pressure monitor (ViSi Mobile) that can measure and track changes in PEP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267477/comparison-of-diagnostic-value-using-a-small-single-channel-p-wave-centric-sternal-ecg-monitoring-patch-with-a-standard-3-lead-holter-system-over-24-hours
#7
Warren M Smith, Fiona Riddell, Morag Madon, Marye J Gleva
BACKGROUND: To compare simultaneous recordings from an external patch system specifically designed to ensure better P-wave recordings and standard Holter monitor to determine diagnostic efficacy. Holter monitors are a mainstay of clinical practice, but are cumbersome to access and wear and P-wave signal quality is frequently inadequate. METHODS: This study compared the diagnostic efficacy of the P-wave centric electrocardiogram (ECG) patch (Carnation Ambulatory Monitor) to standard 3-channel (leads V1, II, and V5) Holter monitor (Northeast Monitoring, Maynard, MA)...
March 2017: American Heart Journal
https://www.readbyqxmd.com/read/28248198/rem-sleep-estimation-based-on-autonomic-dynamics-using-r-r-intervals
#8
Heenam Yoon, Su Hwan Hwang, Jae-Won Choi, Yu Jin Lee, Do-Un Jeong, Kwang Suk Park
OBJECTIVE: We developed an automatic algorithm to determine rapid eye movement (REM) sleep on the basis of the autonomic activities reflected in heart rate variations. APPROACH: The heart rate variability (HRV) parameters were calculated using the R-R intervals from an electrocardiogram (ECG). A major autonomic variation associated with the sleep cycle was extracted from a combination of the obtained parameters. REM sleep was determined with an adaptive threshold applied to the acquired feature...
March 1, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28237125/biomarkers-of-atrial-cardiopathy-and-atrial-fibrillation-detection-on-mobile-outpatient-continuous-telemetry-after-embolic-stroke-of-undetermined-source
#9
Denise Sebasigari, Alexander Merkler, Yang Guo, Gino Gialdini, Benjamin Kummer, Morgan Hemendinger, Christopher Song, Antony Chu, Shawna Cutting, Brian Silver, Mitchell S V Elkind, Hooman Kamel, Karen L Furie, Shadi Yaghi
BACKGROUND: Biomarkers of atrial dysfunction or "cardiopathy" are associated with embolic stroke risk. However, it is unclear if this risk is mediated by undiagnosed paroxysmal atrial fibrillation or flutter (AF). We aim to determine whether atrial cardiopathy biomarkers predict AF on continuous heart-rhythm monitoring after embolic stroke of undetermined source (ESUS). METHODS: This was a single-center retrospective study including all patients with ESUS undergoing 30 days of ambulatory heart-rhythm monitoring to look for AF between January 1, 2013 and December 31, 2015...
February 22, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28227821/dual-modality-arterial-pulse-monitoring-system-for-continuous-blood-pressure-measurement
#10
Wen-Xuan Dai, Yuan-Ting Zhang, Jing Liu, Xiao-Rong Ding, Ni Zhao, Wen-Xuan Dai, Yuan-Ting Zhang, Jing Liu, Xiao-Rong Ding, Ni Zhao, Wen-Xuan Dai, Yuan-Ting Zhang, Xiao-Rong Ding, Ni Zhao, Jing Liu
Accurate and ambulatory measurement of blood pressure (BP) is essential for efficient diagnosis, management and prevention of cardiovascular diseases (CVDs). However, traditional cuff-based BP measurement methods provide only intermittent BP readings and can cause discomfort with the occlusive cuff. Although pulse transit time (PTT) method is promising for cuffless and continuous BP measurement, its pervasive use is restricted by its limited accuracy and requirement of placing sensors on multiple body sites...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227245/monitoring-and-detecting-atrial-fibrillation-using-wearable-technology
#11
Shamim Nemati, Mohammad M Ghassemi, Vaidehi Ambai, Nino Isakadze, Oleksiy Levantsevych, Amit Shah, Gari D Clifford, Shamim Nemati, Mohammad M Ghassemi, Vaidehi Ambai, Nino Isakadze, Oleksiy Levantsevych, Amit Shah, Gari D Clifford, Mohammad M Ghassemi, Shamim Nemati, Nino Isakadze, Vaidehi Ambai, Oleksiy Levantsevych, Amit Shah, Gari D Clifford
Atrial fibrillation (AFib) is diagnosed by analysis of the morphological and rhythmic properties of the electrocardiogram. It was recently shown that accurate detection of AFib is possible using beat-to-beat interval variations. This raises the question of whether AFib detection can be performed using a pulsatile waveform such as the Photoplethysmogram (PPG). The recent explosion in use of recreational and professional ambulatory wrist-based pulse monitoring devices means that an accurate pulse-based AFib screening algorithm would enable large scale screening for silent or undiagnosed AFib, a significant risk factor for multiple diseases...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227243/assessment-of-pre-ejection-period-in-ambulatory-subjects-using-seismocardiogram-in-a-wearable-blood-pressure-monitor
#12
Guanqun Zhang, Amber C Cottrell, Isaac C Henry, Devin B McCombie, Guanqun Zhang, Amber C Cottrell, Isaac C Henry, Devin B McCombie, Isaac C Henry, Devin B McCombie, Amber C Cottrell, Guanqun Zhang
The ability to monitor arterial blood pressure continuously with unobtrusive body worn sensors may provide a unique and potentially valuable assessment of a patient's cardiovascular health. Pulse wave velocity (PWV) offers an attractive method to continuously monitoring blood pressure. However, PWV technologies based on timing measurements between the ECG and a distal PPG suffer from inaccuracies on mobile patients due to the confounding influence of pre-ejection period (PEP). In this paper, we presented a wearable, continuous blood pressure monitor (ViSi Mobile) that can measure and track changes in PEP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28213374/diurnal-differences-in-risk-of-cardiac-arrhythmias-during-spontaneous-hypoglycemia-in-young-people-with-type-1-diabetes
#13
Peter Novodvorsky, Alan Bernjak, Elaine Chow, Ahmed Iqbal, Lianne Sellors, Scott Williams, Robert A Fawdry, Bhavin Parekh, Richard M Jacques, Jefferson L B Marques, Paul J Sheridan, Simon R Heller
OBJECTIVE: Hypoglycemia may exert proarrhythmogenic effects on the heart via sympathoadrenal stimulation and hypokalemia. Hypoglycemia-induced cardiac dysrhythmias are linked to the "dead-in-bed syndrome," a rare, but devastating, condition. We examined the effect of nocturnal and daytime clinical hypoglycemia on electrocardiogram (ECG) in young people with type 1 diabetes. RESEARCH DESIGN AND METHODS: Thirty-seven individuals with type 1 diabetes underwent 96 h of simultaneous ambulatory ECG and blinded continuous interstitial glucose monitoring (CGM) while symptomatic hypoglycemia was recorded...
February 17, 2017: Diabetes Care
https://www.readbyqxmd.com/read/28194254/long-term-continuous-ambulatory-ecg-monitors-and-external-cardiac-loop-recorders-for-cardiac-arrhythmia-a-health-technology-assessment
#14
REVIEW
(no author information available yet)
BACKGROUND: Ambulatory electrocardiography (ECG) monitors are often used to detect cardiac arrhythmia. For patients with symptoms, an external cardiac loop recorder will often be recommended. The improved recording capacity of newer Holter monitors and similar devices, collectively known as longterm continuous ambulatory ECG monitors, suggests that they will perform just as well as, or better than, external loop recorders. This health technology assessment aimed to evaluate the effectiveness, cost-effectiveness, and budget impact of longterm continuous ECG monitors compared with external loop recorders in detecting symptoms of cardiac arrhythmia...
2017: Ontario Health Technology Assessment Series
https://www.readbyqxmd.com/read/28181276/modulation-of-autonomic-nervous-activity-in-the-termination-of-paroxysmal-atrial-fibrillation
#15
Jen-Hung Huang, Yung-Kuo Lin, Ming-Hsiung Hsieh, Shih-Ann Chen, Wan-Chun Chiu, Yi-Jen Chen
BACKGROUND: Autonomic nervous activity plays a critical role in the genesis of paroxysmal atrial fibrillation (AF, PAF). However, the role of autonomic nervous activity on AF termination has not been elucidated. Heart rate variability (HRV) is widely used to evaluate autonomic nervous activity in humans. The purpose of this study was to assess whether autonomic nervous activity assessed by HRV contributes to AF termination. METHODS: Electrocardiograms (ECGs) and HRV were studied in patients with termination of sustained (>30 s) PAF by 24-hour ambulatory Holter monitoring...
February 9, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28129768/exposure-to-air-pollution-near-a-steel-plant-is-associated-with-reduced-heart-rate-variability-a-randomised-crossover-study
#16
Robin H Shutt, Lisa Marie Kauri, Scott Weichenthal, Premkumari Kumarathasan, Renaud Vincent, Errol M Thomson, Ling Liu, Mamun Mahmud, Sabit Cakmak, Robert Dales
BACKGROUND: Epidemiological studies have shown that as ambient air pollution (AP) increases the risk of cardiovascular mortality also increases. The mechanisms of this effect may be linked to alterations in autonomic nervous system function. We wished to examine the effects of industrial AP on heart rate variability (HRV), a measure of subtle changes in heart rate and rhythm representing autonomic input to the heart. METHODS: Sixty healthy adults were randomized to spend five consecutive 8-h days outdoors in one of two locations: (1) adjacent to a steel plant in the Bayview neighbourhood in Sault Ste Marie Ontario or (2) at a College campus, several kilometers from the plant...
January 28, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28096204/atrial-fibrillation-diagnosis-timing-ambulatory-ecg-monitoring-utilization-and-risk-of-recurrent-stroke
#17
Gregory Y H Lip, Tina D Hunter, Maria E Quiroz, Paul D Ziegler, Mintu P Turakhia
BACKGROUND: The risk of recurrence after an initial ischemic stroke or transient ischemic attack (TIA) may be impacted by undiagnosed atrial fibrillation (AF). We therefore assessed the impact of AF diagnosis and timing on stroke/TIA recurrence rates in a large real-world sample of patients. METHODS AND RESULTS: Using commercial claims data (Truven Health Analytics MarketScan), we performed a retrospective cohort study of patients with an index stroke or TIA event recorded in years 2008 through 2011...
January 2017: Circulation. Cardiovascular Quality and Outcomes
https://www.readbyqxmd.com/read/28055987/heart-beat-classification-from-single-lead-ecg-using-the-synchrosqueezing-transform
#18
Christophe L Herry, Martin Frasch, Andrew Je Seely, Hau-Tieng Wu
The processing of ECG signal provides a wealth of information on cardiac function and overall cardiovascular health. While multi-lead ECG recordings are often necessary for a proper assessment of cardiac rhythms, they are not always available or practical, for example in fetal ECG applications. Moreover, a wide range of small non-obtrusive single-lead ECG ambulatory monitoring devices are now available, from which heart rate variability (HRV) and other health-related metrics are derived. Proper beat detection and classification of abnormal rhythms is important for reliable HRV assessment and can be challenging in single-lead ECG monitoring devices...
January 5, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28045723/rate-dependent-left-bundle-branch-block-in-an-ambulatory-surgery-patient-a-case-report
#19
Ashraf Farag, Justin Tsai, Sam Deeb, Deidre Putman-Garcia, John D Wasnick, Lydia A Conlay
A 52-year-old woman, ASA II (American Society of Anesthesia classification II) scheduled for cholecystectomy in an ambulatory center, exhibited a wide-complex tachycardia with ectopy on the monitor after induction with propofol and succinylcholine. Blood pressure remained stable; amiodarone was administered for presumed ventricular tachycardia. A 12-lead electrocardiogram (ECG) showed a new left bundle branch block (LBBB) at 98 beats per minute (bpm), which resolved when the heart rate slowed. Surgery was postponed, and both the LBBB and ectopy recurred frequently during the next 24 hours in the intensive care unit, particularly at heart rates >90 bpm...
February 15, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/27986262/daily-energy-expenditure-and-its-relation-to-health-care-costs-in-patients-undergoing-ambulatory-electrocardiographic-monitoring
#20
Jason George, Rami Khoury Abdulla, Raymond Yeow, Anshul Aggarwal, Judith Boura, James Wegner, Barry A Franklin
Our increasingly sedentary lifestyle is associated with a heightened risk of obesity, diabetes, heart disease, and cardiovascular mortality. Using the recently developed heart rate index formula in 843 patients (mean ± SD age 62.3 ± 15.7 years) who underwent 24-hour ambulatory electrocardiographic (ECG) monitoring, we estimated average and peak daily energy expenditure, expressed as metabolic equivalents (METs), and related these data to subsequent hospital encounters and health care costs. In this cohort, estimated daily average and peak METs were 1...
February 15, 2017: American Journal of Cardiology
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