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Journal of Electrocardiology

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https://www.readbyqxmd.com/read/28366419/an-evaluation-of-planarity-of-the-spatial-qrs-loop-by-three-dimensional-vectorcardiography-its-emergence-and-loss
#1
Dipanjan Ray, Sandipan Hazra, Damodar Prasad Goswami, Peter W Macfarlane, Arnab Sengupta
AIMS: To objectively characterize and mathematically justify the observation that vectorcardiographic QRS loops in normal individuals are more planar than those from patients with ST elevation myocardial infarction (STEMI). METHODS: Vectorcardiograms (VCGs) were constructed from three simultaneously recorded quasi-orthogonal leads, I, aVF and V2 (sampled at 1000 samples/s). The planarity of these QRS loops was determined by fitting a surface to each loop. Goodness of fit was expressed in numerical terms...
March 22, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28390652/a-fast-noise-tolerant-ecg-feature-recognition-algorithm-based-on-probabilistic-analysis-of-gradient-discontinuity
#2
Peter A Watterson
PURPOSE: Improvement in real-time electrocardiogram (ECG) interpretation is still needed, especially for QT estimation. This paper proposes a fast algorithm for ECG feature recognition, based on locating turning points in the waveform gradient. METHODS: The algorithm places the fiducial point at the maximal value of a probabilistic decision function, assessing line intervals of best fit before and after the point and the point location relative to R-wave peaks already found...
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28389016/myotonic-dystrophy-and-brugada-syndrome-a-common-pathophysiologic-pathway
#3
REVIEW
Andrés Ricardo Pérez-Riera, Adrian Baranchuk, Li Zhang, Raimundo Barbosa-Barros, Luiz Carlos de Abreu, Pedro Brugada
Type 1 myotonic dystrophy (DM1) is a hereditary neuromuscular disease affecting multiple organs in human adults. Here we report a 42-year-old man diagnosed with DM1. Having a history of progressive muscular weakness and gradual loss of visual acuity, he was referred to us by his ophthalmologist for risk assessment of undergoing cataract surgery. Cardiology workup revealed type 1 Brugada ECG pattern, positive late potentials and inducible ventricular fibrillation in an electrophysiology study. Literature review revealed that those ECG changes may be observed in DM1, suggesting that DM1 and Brugada syndrome may share a common pathophysiologic pathway...
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28372802/non-invasive-electrocardiographic-predictors-of-atrial-arrhythmias-in-patients-with-the-fontan-palliation
#4
Daniel Cortez, Nandita Sharma, Jason R Imundo, Mark Cohen
BACKGROUND: Fontan palliation patients are at risk for atrial arrhythmias post-operatively. This study aimed to evaluate whether differences in depolarization vector magnitude or spatial P-R angle can reliably predict atrial arrhythmias in patients who had undergone Fontan palliation. METHODS: A total of 115 patients who had Fontan palliation and post-Fontan catheterization were included. Atrial arrhythmias were identified in 14 patients. Measurements of ECG parameters including QRS vector magnitude, P-R duration, spatial QRS-T angle and spatial P-R angle were performed, and compared between those with and without atrial arrhythmias...
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28363478/influence-of-gender-on-the-qt-interval-variability-and-duration-in-different-wake-sleep-stages-in-non-sleep-apneic-individuals-analysis-of-polysomnographic-recordings
#5
Moonika Viigimae, Deniss Karai, Kristjan Pilt, Olli Polo, Heini Huhtala, Kalju Meigas, Jyri Kaik
INTRODUCTION: The aim of the study was to determine the influence of gender and sleep stages, especially rapid eye movement sleep (REM), on QT interval variability and duration in normal subjects. METHODS: Polysomnographic recordings of 24 male and 24 female patients without obstructive sleep apnea were analyzed. In each patient, the QT interval variability index (QTVI) and the corrected QT interval (QTc) values were calculated as means of 2 awake, 4 non-rapid eye movement sleep (NREM) and 3 REM episodes, 300s each...
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28351550/mind-the-gap
#6
Asaf Danon, Yair Elitzur, Sheldon M Singh
We present a case of a woman with an asymptomatic intermittent 2:1 atrioventricular block. The baseline ECG showed a wide QRS with right bundle branch block pattern. Measurement of the HV interval during electrophysiological study was normal. During electrophysiological stimulation, a unique pattern of paradoxical conduction was seen. We discuss the mechanism of the paradoxical conduction.
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28351549/atrial-fibrillation-that-wasn-t
#7
Jesse K Fitzpatrick, Nora Goldschlager
No abstract text is available yet for this article.
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28347481/ventricular-repolarization-duration-and-dispersion-adaptation-after-atropine-induced-rapid-heart-rate-increase-in-healthy-adults
#8
Lennart Bergfeldt, Gunilla Lundahl, Gabriel Bergqvist, Farzad Vahedi, Lennart Gransberg
BACKGROUND: Proper adaptation of ventricular repolarization (VR) to rapid heart rate (HR) increase is crucial for cardiac electro-mechanical function. The pattern and temporal aspects of this adaptation and its components (duration and dispersion) during normal conduction are, however, incompletely known in humans and were the topic of this study. METHODS & RESULTS: The VR duration (QT & QTpeak) and dispersion (Tamplitude, Tarea & ventricular gradient; VG) responses were studied by continuous vectorcardiogram after a bolus injection of atropine 0...
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28347480/electrocardiographic-interference-by-a-sacral-neuromodulation-device
#9
Laiden Suarez-Fuster, Bryce Alexander, Ryan Renaud, Catherine Shaw, Adrian Baranchuk
No abstract text is available yet for this article.
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28347479/artifactual-ecg-changes-induced-by-electrocautery-in-a-patient-with-coronary-artery-disease
#10
B Naveen Naik, Ankur Luthra, Ashish Dwivedi, Anudeep Jafra
Continuous monitoring of 5-lead electrocardiogram is a basic standard of care (included under standard ASA monitor) in the operating room and electrocautery interference is a common phenomenon. Clinical signs, along with monitored waveforms from other simultaneously monitored parameters may provide us clues to differentiate artifacts from true changes on the electrocardiogram. An improved understanding of the artifacts generated by electrocautery and their identifying characteristics is important to avoid misinterpretation, misdiagnosis, and hence mismanagement...
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28343654/negative-concordant-t-waves-during-paced-ventricular-rhythm-an-honest-enemy-is-better-than-a-false-friend
#11
Irene di Matteo, Pasquale Crea
The ECG diagnosis of myocardial infarction and ischemia in pacemaker patients is often challenging. The three criteria, proposed by Sgarbossa et al. in 1996, useful to suspect myocardial ischaemia in patient with left bundle branch block were demonstrated to be valid also in pacemaker patients. In the last years, concordant negative T waves in patients with ventricular paced rhythm were linked to various expressions of acute myocardial injury. If available, comparison with previous ECG is crucial. Partial persistence of cardiac memory during fusion beats created an anomalous concordance between negative T waves and QRS axis and could induce erroneous suspicions...
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28343653/swallow-induced-syncope-and-carotid-sinus-hypersensitivity-coincident-or-associated-conditions
#12
Eed Abu Zaid, Moti Haim, Hilmi Alnsasra, Yuval Konstantino
Swallow induced syncope is a rare clinical condition which is thought to result from an abnormal vagal reflex leading to bradycardia and cerebral hypoperfusion. It mostly occurs in patients with organic or functional disorders of the esophagus, and often requires permanent pacemaker implantation, along with treatment of the underlying esophageal pathology. In the following case, we report of a 71-year-old male with achalasia post per oral endoscopic myectomy, who presented with syncope and documented AV-block while eating solid food...
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28341305/welcome-to-the-residents-and-fellows-corner
#13
EDITORIAL
William F McIntyre
No abstract text is available yet for this article.
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28341304/the-normal-variants-in-the-left-bundle-branch-system
#14
REVIEW
M V Elizari
This article reviewed the main anatomic and physiopathological aspects of the left bundle branch from its origin in the His bundle and its intraventricular distribution on the left endocardial surface. The results are based on the relevant literature and on personal observations executed on 206 hearts distributed as follows: 67 dogs, 60 humans, 45 sheep, 22 pigs, 10 cows, 2 monkeys, 1 guanaco, and 1 sea lion. The main anatomical features of the His-Purkinje conducting system may be summarized as follows: The bundle of His is composed by two segments: the penetrating and branching portions...
March 14, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28330682/the-impact-of-posture-on-the-cardiac-depolarization-and-repolarization-phases-of-the-qt-interval-in-healthy-subjects
#15
Yurie Obata, Pavel Ruzankin, Qi Jia Ong, Dan E Berkowitz, Ronald D Berger, Jochen Steppan, Viachaslau Barodka
BACKGROUND: Postural changes affect both heart rate and the QT interval. OBJECTIVE: To investigate the effects of postural changes on the depolarization and repolarization phases of the QT interval. METHODS: A three lead ECG from 12 healthy young volunteers was recorded in the standing, sitting and in the supine positions. For the purpose of this study, we defined the depolarization phase as the QRS complex plus the ST segment and the repolarization phase as the duration of the T wave...
March 12, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28284434/a-simple-ecg
#16
EDITORIAL
Adrian Baranchuk
No abstract text is available yet for this article.
March 1, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28274543/electrocardiographic-conundrum-what-is-the-reason-of-qrs-axis-variability
#17
Giuseppe Picciolo, Lilia Oreto
No abstract text is available yet for this article.
February 22, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28347478/changing-p-wave-morphology-what-is-the-mechanism
#18
Angela Maria Zedda, Federica Torri, Livio Bertagnolli, Arash Arya
A 76-year-old woman, affected by drugs resistant focal atrial tachycardia, underwent a catheter ablation procedure in our Hospital. During ablations we observed on the surface ECG a progressive modification of the second component of the P wave (delayed and then negative in inferior leads). These findings demonstrated, compared to the beginning of the procedure, a different propagation of the activation wave from the right to the left atrium, helped to identify the true origin of a focal atrial tachycardia...
February 20, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28341306/high-frequency-qrs-analysis-in-the-evaluation-of-chest-pain-in-the-emergency-department
#19
Ori Galante, Guy Amit, Yair Granot, Linda R Davrath, Shimon Abboud, Doron Zahger
OBJECTIVES: High frequency QRS (HFQRS) analysis has been shown to be an accurate marker for myocardial ischemia. Our objective was to test the use of HFQRS in diagnosing ACS in the emergency department. METHODS: 324 patients presenting to the ED with chest pain were enrolled. Resting ECG was recorded and later analyzed by an HFQRS algorithm. Results were compared to the conventional ECG diagnosis by 3 independent interpretations: treating physician, expert cardiologist and an automated computer program...
February 20, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28274541/atrial-fibrillation-in-transcatheter-aortic-valve-implantation-patients-incidence-outcome-and-predictors-of-new-onset
#20
David Zweiker, Mario Fröschl, Stephanie Tiede, Paul Weidinger, Johannes Schmid, Martin Manninger, Helmut Brussee, Robert Zweiker, Josepha Binder, Heinrich Mächler, Wolfgang Marte, Robert Maier, Olev Luha, Albrecht Schmidt, Daniel Scherr
BACKGROUND: There is controversial evidence if atrial fibrillation (AF) alters outcome after transcatheter aortic valve implantation (TAVI). TAVI itself may promote new-onset AF (NOAF). METHODS: We performed a single-center study including 398 consecutive patients undergoing TAVI. Before TAVI, patients were divided into a sinus rhythm (SR) group (n=226, 57%) and baseline AF group (n=172, 43%) according to clinical records and electrocardiograms. Furthermore, incidence and predictors of NOAF were recorded...
February 20, 2017: Journal of Electrocardiology
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