1,723 results match your criteria minute bpm

Pregnancy-induced increased heart rate is independent of thyroid hormones.

Heart Rhythm O2 2021 Apr 4;2(2):168-173. Epub 2021 Mar 4.

Research Center, Montreal Heart Institute, Montreal, Canada.

Background: The heart rate increases by 10-20 beats per minute (bpm) throughout pregnancy in women, reaching maximum heart rate in the third trimester. During pregnancy, important changes in thyroid hormones also occur, with increases of up to 50% in the levels of triiodothyronine (T), the biological active thyroid hormone. In addition, T has been shown to regulate cardiac electrophysiology. Read More

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Effectiveness of a simple medication adjustment protocol for optimizing peri-cardioversion rate control: A derivation and validation cohort study.

Heart Rhythm O2 2021 Feb 12;2(1):46-52. Epub 2021 Jan 12.

Division of Cardiology, Department of Medicine, University of British Columbia, Vancouver, Canada.

Background: Rate control medications are foundational in the management of persistent atrial fibrillation (AF). There are no guidelines for adjusting these medications prior to elective direct-current cardioversion (DCCV).

Objective: To derive and validate a preprocedural medication adjustment protocol that maintains peri-DCCV rate control and minimizes risk of postconversion bradycardia, pauses, need for pacing, and cardiopulmonary resuscitation (CPR). Read More

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February 2021

A randomised, controlled trial to determine the effect of levothyroxine on Standardbred racehorses.

Equine Vet J 2021 Jun 8. Epub 2021 Jun 8.

Department of Veterinary Clinical Sciences, Purdue University College of Veterinary Medicine, West Lafayette, Indiana, 47907, USA.

Background: The use of thyroid supplement is pervasive in athletic horses although its effects on measures of performance are not known.

Objectives: One purpose of this study was to determine whether supra-physiologic doses of levothyroxine affect the velocities at which blood lactate was greater than 4 mmol/L (V ) and heart rate was over 150 (V ) and 200 (V ) beats per minute respectively. Additionally, a survey of post-race blood samples was also conducted to determine whether high thyroxine concentrations were common in racehorses. Read More

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Feasibility and validation of trans-valvular flow derived by four-dimensional flow cardiovascular magnetic resonance imaging in patients with atrial fibrillation.

Wellcome Open Res 2021 18;6:73. Epub 2021 May 18.

Department of Infection, Immunity & Cardiovascular Disease, University of Sheffield, Sheffield, UK.

: Four-dimensional (4D) flow cardiovascular magnetic resonance imaging (MRI) is an emerging technique used for intra-cardiac blood flow assessment. The role of 4D flow cardiovascular MRI in the assessment of trans-valvular flow in patients with atrial fibrillation (AF) has not previously been assessed. The purpose of this study was to assess the feasibility, image quality, and internal validity of 4D flow cardiovascular MRI in the quantification of trans-valvular flow in patients with AF. Read More

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Expired Carbon Dioxide during Newborn Resuscitation as Predictor of Outcome.

Resuscitation 2021 Jun 4. Epub 2021 Jun 4.

Department of Pediatrics and Adolescence Medicine, Østfold Hospital Trust, Norway; Norwegian Institute of Public Health, Oslo, Norway; Pediatric Research Institute, Faculty of Medicine, University of Oslo, Norway.

Aim: To explore and compare expired CO (ECO) and heart rate (HR), during newborn resuscitation with bag-mask ventilation, as predictors of 24-h outcome.

Methods: Observational study from March 2013 to June 2017 in a rural Tanzanian hospital. Side-stream measures of ECO, ventilation parameters, HR, clinical information, and 24-h outcome were recorded in live born bag-mask ventilated newborns with initial HR < 120 bpm. Read More

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Effect of surgical pleth index-guided analgesia versus conventional analgesia techniques on fentanyl consumption under multimodal analgesia in laparoscopic cholecystectomy: a prospective, randomized and controlled study.

BMC Anesthesiol 2021 Jun 4;21(1):167. Epub 2021 Jun 4.

Department of Anaesthesiology, The Fourth Affiliated Hospital, Zhejiang University, School of Medicine, 322000, Yiwu, Zhejiang, China.

Background: The Surgical Pleth Index (SPI) is an objective tool that can reflect nociception-antinociception balance and guide the use of intraoperative analgesics. Multimodal analgesia has been neglected in many previous studies. The aim of this study was to compare fentanyl consumption using SPI-guided analgesia versus conventional analgesia techniques under multimodal analgesia in laparoscopic cholecystectomy. Read More

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Listening to Fast-Tempo Music During a Post-Exercise Passive Rest Period Improved Subsequent Sprint Cycling.

Percept Mot Skills 2021 Jun 2:315125211022701. Epub 2021 Jun 2.

Graduate School of Department of Interdisciplinary Research, University of Yamanashi, Kofu, Japan.

Listening to music during active recovery between exercise bouts has been found to help maintain high levels of exercise performance; however, the effect of listening to music alone with no exercise while resting passively has not been elucidated. We examined whether listening to music during static (passive) recovery affects subsequent repeated sprint performances and/or psychological and physiological responses in healthy young males. Twelve healthy young male athletes completed two consecutive sets of 7 × 7 second maximal cycling sprints with a 30-second rest interval between the sprints. Read More

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Heart Rate Fluctuation and Mortality in Critically Ill Myocardial Infarction Patients: A Retrospective Cohort Study.

Front Cardiovasc Med 2021 14;8:577742. Epub 2021 May 14.

Department of Cardiology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, China.

Whether heart rate (HR) fluctuation after admission has an impact on the outcomes of critically ill myocardial infarction (MI) patients in intensive care unit remains unknown. A total of 2,031 MI patients were enrolled from the Medical Information Mart for Intensive Care (MIMIC-III) database. HR fluctuation was calculated as the maximum HR minus the minimum HR in the initial 24 h after admission. Read More

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"Two for One", Novel Dual Left Anterior Descending Artery (LAD) Variant: Type XIII.

Cureus 2021 Apr 27;13(4):e14717. Epub 2021 Apr 27.

Cardiology, Northwell Health, Manhasset, USA.

Dual left anterior descending artery (LAD) is a rare phenomenon that occurs in less than one percent of the population. To date, 12 variants have been identified. Proper identification of coronary vessels is crucial in emergent situations that require prompt action, such as percutaneous coronary intervention (PCI). Read More

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Association of Wearable Device Use With Pulse Rate and Health Care Use in Adults With Atrial Fibrillation.

JAMA Netw Open 2021 May 3;4(5):e215821. Epub 2021 May 3.

Division of Cardiovascular Medicine, University of Utah School of Medicine, Salt Lake City.

Importance: Increasingly, individuals with atrial fibrillation (AF) use wearable devices (hereafter wearables) that measure pulse rate and detect arrhythmia. The associations of wearables with health outcomes and health care use are unknown.

Objective: To characterize patients with AF who use wearables and compare pulse rate and health care use between individuals who use wearables and those who do not. Read More

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A New Framework for Robust Heart Rate Measurement Based on the Head Motion State Estimation.

IEEE J Biomed Health Inform 2021 May 26;PP. Epub 2021 May 26.

It is of great significance in managing human health, preventing and curing diseases such as heart disease to measure and monitor the physiological parameters accurately and robustly. However, imaging photoplethysmography (iPPG) can be easily affected by the ambient illumination variations or the subjects motions. In this paper, therefore, a novel framework of heart rate (HR) measurement robust to both illumination and motion artefacts is proposed, which combines the projection-plane-switching-based iPPG method (2PS) with the singular spectrum analysis (SSA). Read More

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Cardiodynamic variables measured by impedance cardiography during a 6-minute walk test are reliable predictors of peak oxygen consumption in young healthy adults.

PLoS One 2021 25;16(5):e0252219. Epub 2021 May 25.

Department of Rehabilitation, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University Health Science Centre, Shenzhen, China.

Accurate prediction of aerobic capacity is necessary to guide appropriate exercise prescription. It is common to use 6-minute walk distance (6MWD) to predict peak oxygen uptake (VO2peak) in the clinical environment. The aim of this study was to determine whether prediction of VO2peak can be improved by the inclusion of cardiovascular indices derived by impedance cardiography (ICG) during the 6MWT. Read More

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Influence of respiration frequency on heart rate variability parameters: A randomized cross-sectional study.

J Back Musculoskelet Rehabil 2021 May 10. Epub 2021 May 10.

Saxion University of Applied Sciences, Faculty of Health and Physical Activity, Enschede, The Netherlands.

Background: Many patients visiting physiotherapists for musculoskeletal disorders face psychosocial challenges which may form a large barrier to recover. There are only a limited number of evidence based psychosocial therapies, but they are mainly based on breathing exercises.

Objective: to study which respiration frequency would lead to the highest relaxation, reflected in vagal tone derived from the heart rate variability (HRV) in healthy subjects. Read More

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Long term genetic selection for reproductive success affects neonatal lamb vitality across cold stress conditions.

J Therm Biol 2021 May 17;98:102908. Epub 2021 Mar 17.

Department of Animal Sciences, Stellenbosch University, Stellenbosch, 7602, South Africa. Electronic address:

Adverse weather conditions are important contributors to mortality in new-born lambs. Previous studies have shown variation between lambs in their ability to cope with circumstances of cold stress, and genetic selection could be a viable option for improving animal robustness. The Elsenburg Merino flock was divergently selected on number of lambs weaned (NLW). Read More

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Effect of Reducing Heart Rate on Outcomes in Patients With Reduced Ejection Fraction.

Am J Cardiol 2021 Jul 15;150:77-81. Epub 2021 May 15.

Cardiovascular Center, MacKay Memorial Hospital, Taipei, Taiwan; Department of Medicine, Mackay Medical College, New Taipei, Taiwan. Electronic address:

Since 1953, sinus tachycardia has been defined as a heart rate (HR) in sinus rhythm of >100 beats per minute (bpm). However, this number has never been formally evaluated, and no established threshold values for special groups, such as those with heart failure (HF) accompanied by a reduced ejection fraction (HFrEF). Herein, we provided evidence that lowering the HR of patients with HFrEF to <70 bpm with medications such as ivabradine improves outcomes. Read More

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Severe Bradycardia Increases the Incidence and Severity of Torsade de Pointes Arrhythmias by Augmenting Preexistent Spatial Dispersion of Repolarization in the CAVB Dog Model.

Front Physiol 2021 26;12:642083. Epub 2021 Apr 26.

Department of Medical Physiology, Universitair Medisch Centrum Utrecht, Utrecht, Netherlands.

Introduction: Torsade de pointes arrhythmias (TdP) in the chronic atrioventricular block (CAVB) dog model result from proarrhythmic factors, which trigger TdP and/or reinforce the arrhythmic substrate. This study investigated electrophysiological and arrhythmogenic consequences of severe bradycardia for TdP.

Methods: Dofetilide (25 μg/kg per 5 min) was administered to eight anesthetized, idioventricular rhythm (IVR) remodeled CAVB dogs in two serial experiments: once under 60 beats per minute (bpm), right ventricular apex paced (RVA60) conditions, once under more bradycardic IVR conditions. Read More

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Heart rate detection properties of dry-electrode ECG compared to conventional 3-lead gel-electrode ECG in newborns.

BMC Res Notes 2021 May 1;14(1):166. Epub 2021 May 1.

Department of Paediatrics, Stavanger University Hospital, Post Box 8100, 4068, Stavanger, Norway.

Objective: To compare the accuracy of heart rate detection properties of a novel, wireless, dry-electrode electrocardiogram (ECG) device, NeoBeat®, to that of a conventional 3-lead gel-electrode ECG monitor (PropaqM®) in newborns.

Results: The study population had a mean gestational age of 39 weeks and 2 days (1.5 weeks) and birth weight 3528 g (668 g). Read More

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A new approach to HR monitoring using photoplethysmographic signals during intensive physical exercise.

Phys Eng Sci Med 2021 Jun 30;44(2):535-543. Epub 2021 Apr 30.

State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China.

The use of photoplethysmography (PPG) on the wrist to measure physiological indicators has attracted wide attention because of the portability and real-time characteristic of this technology. However, accurate estimation of the heart rate (HR) is difficult to realize using PPG because of the interference of motion artifacts. To address this problem, a method combining multichannel PPG signals is proposed. Read More

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Automated Non-Contact Respiratory Rate Monitoring of Neonates Based on Synchronous Evaluation of a 3D Time-of-Flight Camera and a Microwave Interferometric Radar Sensor.

Sensors (Basel) 2021 Apr 23;21(9). Epub 2021 Apr 23.

Institute of High-Frequency Technology, Hamburg University of Technology, 21073 Hamburg, Germany.

This paper introduces an automatic non-contact monitoring method based on the synchronous evaluation of a 3D time-of-flight (ToF) camera and a microwave interferometric radar sensor for measuring the respiratory rate of neonates. The current monitoring on the Neonatal Intensive Care Unit (NICU) has several issues which can cause pressure marks, skin irritations and eczema. To minimize these risks, a non-contact system made up of a 3D time-of-flight camera and a microwave interferometric radar sensor is presented. Read More

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Locomotion Mode Recognition Algorithm Based on Gaussian Mixture Model Using IMU Sensors.

Sensors (Basel) 2021 Apr 15;21(8). Epub 2021 Apr 15.

Department of Mechatronics Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan-si 15588, Gyeonggi-do, Korea.

The number of elderly people has increased as life expectancy increases. As muscle strength decreases with aging, it is easy to feel tired while walking, which is an activity of daily living (ADL), or suffer a fall accident. To compensate the walking problems, the terrain environment must be considered, and in this study, we developed the locomotion mode recognition (LMR) algorithm based on the gaussian mixture model (GMM) using inertial measurement unit (IMU) sensors to classify the five terrains (level walking, stair ascent/descent, ramp ascent/descent). Read More

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Current limits for flowmeter resistance in metabolic carts can negatively affect exercise performance.

Physiol Rep 2021 Apr;9(7):e14814

Exercise Physiology Lab, Institute of Human Movement Sciences and Sport, ETH Zurich, Zurich, Switzerland.

Purpose: To investigate whether a metabolic cart using a flowmeter in the upper range of accepted resistance to airflow (<1.5 cmH O∙L ∙s for flows up to 14 L∙s , American Thoracic Society) negatively impacts exercise performance in healthy individuals.

Methods: 16 recreationally active males (age 25 ± 1 years, height 180 ± 6 cm, weight 73. Read More

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Atelectasis, Shunt, and Worsening Oxygenation Following Reduction of Respiratory Rate in Healthy Pigs Undergoing ECMO: An Experimental Lung Imaging Study.

Front Physiol 2021 9;12:663313. Epub 2021 Apr 9.

Department of Anesthesia, Critical Care and Emergency, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.

Reducing the respiratory rate during extracorporeal membrane oxygenation (ECMO) decreases the mechanical power, but it might induce alveolar de-recruitment. Dissecting de-recruitment due to lung edema vs. the fraction due to hypoventilation may be challenging in injured lungs. Read More

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Cardiac Autonomic Modulation of Heart Rate Recovery in Children with Spina Bifida.

Int J Sports Med 2021 Apr 22. Epub 2021 Apr 22.

Departamento Ciências da Saúde, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil.

We aimed to analyse cardiac autonomic control by assessing the post-exercise heart rate recovery (HRR) and physical fitness in children and adolescents with spina bifida (SB), compared to participants with typical development. A total of 124 participants, 42 with spina bifida (SB group) and 82 typical developmental controls (CO group) performed the arm cranking exercise test with a gas analysis system. HRR was determined at the first (HRR_1) and second (HRR_2) minute at recovery phase. Read More

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Concurrent Validity of a Stationary Cycling Test and Buffalo Concussion Treadmill Test in Adults with Concussion.

J Athl Train 2021 Apr 22. Epub 2021 Apr 22.

1Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.

Context: Following concussion, a multi-faceted assessment is recommended, including tests of physical exertion. The current gold standard for exercise testing following concussion is the Buffalo Concussion Treadmill Test (BCTT); however, there is a lack of validated tests that utilize alternative exercise modalities.

Objective: To assess the feasibility and concurrent validity of a novel cycling test of exertion compared to the BCTT. Read More

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Heart rate and adverse outcomes in patients with prevalent atrial fibrillation.

Open Heart 2021 04;8(1)

Population Health Research Institute, McMaster University, Hamilton, Ontario, Canada

Objective: The optimal target heart rate in patients with prevalent atrial fibrillation (AF) is not well defined. The aim of this study was to analyse the associations between heart rate and adverse outcomes in a large contemporary cohort of patients with prevalent AF.

Methods: From two prospective cohort studies, we included stable AF outpatients who were in AF on the baseline ECG. Read More

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Efficacy of ivabradine in HIV-associated dilated cardiomyopathy.

Recenti Prog Med 2021 Apr;112(4):311-314

UOC Farmacia Ospedaliera, PO "Annunziata", Azienda Ospedaliera di Cosenza, Italy.

Ivabradine is a pure heart rate-lowering drug that acts directly on the sinus node and does not affect atrioventricular or intraventricular conduction times, myocardial contractility or ventricular repolarization. Ivabradine is used in the treatment of adults with New York Heart Association (NYHA) class II-IV chronic heart failure (CHF) with systolic dysfunction, in sinus rhythm, with a heart rate of ≥75 beats per minute (bpm). This report describes the beneficial effect of ivabradine on clinical parameters in a HIV-infected patient with dilated cardiomyopathy presenting with NYHA class III CHF symptoms. Read More

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Metabolic and cardiovascular effects of body weight supported treadmill walking in healthy older adults.

J Sports Med Phys Fitness 2021 Apr 19. Epub 2021 Apr 19.

Physical Therapy Department, University of Findlay Findlay, OH, USA.

Background: The purpose of this study was to determine if body weight supported treadmill training (BWSTT) decreased metabolic and cardiovascular demand in older (50-74 years) healthy adults while walking a self-selected speeds. The results of this study could impact clinician application to exercise therapy.

Methods: Twenty subjects (50% female, 58. Read More

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Effects of selective heart rate reduction with ivabradine on LV function and central hemodynamics in patients with chronic coronary syndrome.

Int J Cardiol Heart Vasc 2021 Jun 23;34:100757. Epub 2021 Mar 23.

Department of Internal Medicine III, Saarland University Medical Center, Saarland University, Homburg/Saar, Germany.

Objectives: We assessed left ventricular (LV) function and central hemodynamic effects in patients with a heart rate (HR) at rest of ≥70 beats per minute (bpm) and chronic coronary syndrome (CCS) after long-term treatment with ivabradine compared to placebo by cardiac magnetic resonance (CMR) imaging.

Methods And Results: In a randomized, double-blinded, prospective cross-over design, 23 patients (18 male, 5 female) were treated with ivabradine (7.5 mg bid) or placebo for 6 months. Read More

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Minimum heart rate and mortality in critically ill myocardial infarction patients: an analysis of the MIMIC-III database.

Ann Transl Med 2021 Mar;9(6):496

Department of Cardiology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, Guangzhou, China.

Background: Low minimum heart rate (MHR) is common in critically ill myocardial infarction (MI) patients. However, the association between MHR and the mortality of critically ill MI patients remains unclear.

Methods: In this retrospective cohort study, a total of 2,031 critically ill MI patients were enrolled from the Medical Information Mart for Intensive Care (MIMIC)-III database. Read More

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Meta-Analysis: Hemodynamic Responses to Sub-anesthetic Doses of Ketamine in Patients With Psychiatric Disorders.

Front Psychiatry 2021 24;12:549080. Epub 2021 Mar 24.

Yale Child Study Center, Yale University School of Medicine, New Haven, CT, United States.

Ketamine, a medication traditionally used as an anesthetic, has increasingly been recognized as an effective treatment for psychiatric disorders. At sub-anesthetic doses (defined here as ≤ 0.5 mg/kg), ketamine treatment has been studied in patients with treatment-resistant depression (TRD), obsessive-compulsive disorder (OCD), post-traumatic stress disorder (PTSD), and social anxiety disorder (SAD). Read More

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