keyword
MENU ▼
Read by QxMD icon Read
search

Block AV

keyword
https://www.readbyqxmd.com/read/28343654/negative-concordant-t-waves-during-paced-ventricular-rhythm-an-honest-enemy-is-better-than-a-false-friend
#1
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
#2
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/28340894/wenckebach-pattern-in-right-bundle-branch-block-benign-or-not
#3
Weiting Huang, Paul Chun Yih Lim, Chi-Keong Ching
A Mobitz type I block (Wenckebach phenomenon) with narrow QRS complex is almost always due to a lesion in the AV node. In a type I block with wide QRS complex (>0.12sec), the block can be in the His-Purkinje system in 60-70% of the cases. Even though the progressive PR prolongation with every conducted beat suggests Wenckebach phenomenon, one needs to pay attention to the accompanying QRS complex. In the setting of persistent right bundle branch block, axis change of subsequent conducted beat before an unconducted p suggests alternating fascicular block, giving clue to unreliable infra-Hisian conduction; and in the setting of symptoms, a pacemaker should be implanted...
March 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28302382/congenital-heart-defect-causing-mutation-in-nkx2-5-displays-in-vivo-functional-deficit
#4
Abeer F Zakariyah, Rashida F Rajgara, John P Veinot, Ilona S Skerjanc, Patrick G Burgon
The Nkx2.5 gene encodes a transcription factor that plays a critical role in heart development. In humans, heterozygous mutations in NKX2.5 result in congenital heart defects (CHDs). However, the molecular mechanisms by which these mutations cause the disease remain unknown. NKX2.5-R142C is a mutation that was reported to be associated with atrial septal defect (ASD) and atrioventricular (AV) block in 13-patients from one family. The R142C mutation is located within both the DNA-binding domain and the nuclear localization sequence of NKX2...
March 14, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28299825/fingolimod-gilenya-%C3%A2-in-multiple-sclerosis-bradycardia-atrioventricular-blocks-and-mild-effect-on-the-qtc-interval-something-to-do-with-the-l-type-calcium-channel
#5
Sylvie Pilote, Chantale Simard, Benoit Drolet
Cardiac arrhythmias and ECG abnormalities including bradycardia, prolongation of the QT interval and atrioventricular (AV) conduction blocks have been extensively observed with fingolimod, the first marketed oral drug for treating the relapsing-remitting form of multiple sclerosis. The present study was aiming to further elucidate the effects of fingolimod on cardiac electrophysiology at three different levels; 1) in vitro, 2) ex vivo and 3) in vivo. 1) Patch-clamp experiments in whole cell configuration were performed on Cav 1...
March 16, 2017: Fundamental & Clinical Pharmacology
https://www.readbyqxmd.com/read/28294370/is-there-a-prognostic-relevance-of-electrophysiological-studies-in-bundle-branch-block-patients
#6
Harilaos Bogossian, Gerrit Frommeyer, Kornelius Göbbert, Fuad Hasan, Quy Suu Nguyen, Ilias Ninios, Dejan Mijic, Dirk Bandorski, Reinhard Hoeltgen, Melchior Seyfarth, Bernd Lemke, Lars Eckardt, Markus Zarse
BACKGROUND: The present European guidelines suggest a diagnostic electrophysiological (EP) study to determine indication for cardiac pacing in patients with bundle branch block and unexplained syncope. We evaluated the prognostic relevance of an EP study for mortality and the development of permanent complete atrioventricular (AV) block in patients with symptomatic bifascicular block and first-degree AV block. HYPOTHESIS: The HV interval is a poor prognostic marker to predict the development of permanent AV block in patients with symptomatic bifascicular block (BFB) and AV block I°...
March 15, 2017: Clinical Cardiology
https://www.readbyqxmd.com/read/28280512/a-case-of-congenitally-corrected-transposition-of-great-arteries-an-infrequent-happenstance
#7
Prakash Ajmera, Vikas Medep
Congenitally corrected transposition of the great arteries (CCTGA) is rare form of congenital heart diseases. It may be present with or without associated anomalies. Patients with CCTGA are usually diagnosed at early stages of life due to associated anomalies, but they may even remain asymptomatic till later decades of their life. We report a case of a 42-year-old man who presented at neurosurgery department with dizziness, seizures, and loss of consciousness, in whom isolated CCTGA was discovered incidentally...
2017: Case Reports in Medicine
https://www.readbyqxmd.com/read/28262258/safer-and-escape-junctional-rhythm-a-singular-trigger-for-pacemaker-mediated-tachycardia
#8
Pasquale Crea, Teresa Crea, Giuseppe Picciolo, Francesco Luzza
A 70-year-old man, who previously received a dual chamber pacemaker for paroxysmal AV block (Sorin Symphony DR 2550), was noted on telemetry to have multiple episodes of rapid ventricular pacing at approximately 120bpm. Evaluation of the telemetry strips revealed that all of the rapid ventricular pacing episodes were initiated by brief runs of escape junctional rhythm. Programmed bradycardia parameters were AAI SafeR with lower rate limit of 50bpm.
February 20, 2017: Journal of Electrocardiology
https://www.readbyqxmd.com/read/28259696/comparison-of-strategies-for-catheter-ablation-of-focal-atrial-tachycardia-originating-near-the-his-bundle-region
#9
Evgeny Lyan, Mauro Toniolo, Alexey Tsyganov, Luca Rebellato, Alessandro Proclemer, Massimiliano Manfrin, Anatoly Nechepurenko, Alexandr Morozov, Ayan Abdrahmanov, Grigory Gromyko, Vitaly Lyashenko, Marina Yakovleva
BACKGROUND: Recent studies have suggested that para-Hisian atrial tachycardia (AT) can be successfully ablated from the right atrium (RA), left atrium (LA) or non-coronary cusp (NCC) in the aorta; however, the best approach remains unclear. OBJECTIVE: This study aimed to compare different approaches to radiofrequency catheter ablation (RFCA) of para-Hisian AT. METHODS: We retrospectively analyzed 68 consecutive patients (72% females, aged 61±13 years) treated with RFCA for this type of AT...
March 1, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28248410/low-permanent-pacemaker-rates-following-lotus-device-implantation-for-transcatheter-aortic-valve-replacement-due-to-modified-implantation-protocol
#10
Florian Krackhardt, Behrouz Kherad, Maximilian Krisper, Burkert Pieske, Michael Laule, Carsten Tschöpe
BACKGROUND: Conduction disturbances requiring permanent pacemaker implantation following transcatheter aortic valve replacement (TAVR) are a common problem. Pacemaker implantation rates after TAVR appear to be higher compared to conventional aortic valve replacement. The aim of this study was to analyze whether a high annulus implantation conveys the benefit of a decreased rate of permanent pacemaker implantation while being safe and successful according to VAR2-criteria. METHODS: A total of 23 patients with symptomatic severe aortic valve stenosis, an aortic annulus of 19-27mm and at high risk for surgery were treated with the Lotus valve...
March 1, 2017: Cardiology Journal
https://www.readbyqxmd.com/read/28219978/a-mutation-in-the-g-protein-gene-gnb2-causes-familial-sinus-node-and-atrioventricular-conduction-dysfunction
#11
Birgit Stallmeyer, Johanna Kuß, Stefan Kotthoff, Sven Zumhagen, Kirsty S Vowinkel, Susanne Rinne, Lina A Matschke, Corinna Friedrich, Ellen Schulze-Bahr, Stephan Rust, Guiscard Seebohm, Niels Decher, Eric Schulze-Bahr
Rationale: Familial sinus node and atrioventricular (AV) conduction dysfunction is a rare disorder that leads to paroxysmal dizziness, fatigue and syncope due to a temporarily or permanent reduced heart rate. To date, only a few genes for familial sinus and/or AV conduction dysfunction are known and the majority of cases remain etiologically unresolved. Objective: We aim to identify the disease gene in a large three-generation family (n=25) with autosomal dominant sinus node dysfunction (SND) and AV block (AVB) and to characterise the mutation-related pathomechanisms in familial SND+AVB...
February 20, 2017: Circulation Research
https://www.readbyqxmd.com/read/28211989/timothy-syndrome-1-genotype-without-syndactyly-and-major-extracardiac-manifestations
#12
Róbert Sepp, Lidia Hategan, Attila Bácsi, Judit Cseklye, László Környei, János Borbás, Márta Széll, Tamás Forster, István Nagy, Zoltán Hegedűs
Timothy syndrome 1 (TS1) is a rare genetic disorder characterized by multisystem abnormalities including QT prolongation, congenital heart defects, facial dysmorphism, episodic hypoglycemia, and neurological symptoms. A morphological hallmark of TS1 is syndactyly, present in all cases. TS1 is caused by the canonical p.Gly406Arg mutation in the alternatively spliced exon 8A in the CACNA1C gene, encoding for the main cardiac L-type calcium channel. A variant case of TS1 is reported. The proband had intermittent fetal bradycardia with heart rate of 72 bpm...
March 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28197280/predictors-of-permanent-pacemaker-implantation-after-coronary-artery-bypass-grafting-and-valve-surgery-in-adult-patients-in-current-surgical-era
#13
Bandar Al-Ghamdi, Yaseen Mallawi, Azam Shafquat, Alexandra Ledesma, Nadiah AlRuwaili, Mohamed Shoukri, Shahid Khan, Aly Al Sanei
BACKGROUND: Permanent pacemaker (PPM) implantation after cardiac surgery is required in 0.4-6% of patients depending on cardiac surgery type. PPM implantation in the early postoperative period may reduce morbidity and postoperative hospital stay. We performed a retrospective review of electronic medical records of adult patients with coronary artery bypass grafting (CABG), valve surgery, or both, over a 3-year period. Our aim was to identify predictors of PPM requirements and PPM dependency on follow-up in the current surgical era...
August 2016: Cardiology Research
https://www.readbyqxmd.com/read/28185059/severe-proarrhythmic-potential-of-the-antiemetic-agents-ondansetron-and-domperidone
#14
Gerrit Frommeyer, Christina Fischer, Christian Ellermann, Philipp S Lange, Dirk G Dechering, Simon Kochhäuser, Michael Fehr, Lars Eckardt
The potential of ondansetron and domperidone, both clinically established antiemetic agents, to increase the QT-interval has been described in several case reports. Therefore, the aim of the present study was to investigate whether these drugs may provoke polymorphic ventricular tachycardia in a sensitive experimental model of drug-induced proarrhythmia. In 10 female rabbits, ondansetron (1, 5 and 10 µM, n = 10) or domperidone (0.5, 1 and 2 µM, n = 8) was infused after obtaining baseline data. Eight endo- and epicardial monophasic action potentials and a simultaneously recorded 12-lead ECG reproduced the clinically observed QT-prolongation (ondansetron: 1 µM:+17 ms, 5 µM:+41 ms, 10 µM:+78 ms, p < 0...
February 9, 2017: Cardiovascular Toxicology
https://www.readbyqxmd.com/read/28155224/symptomatic-inspiration-induced-atrio-ventricular-block-treated-with-pacemaker-implant
#15
Diego A Hoffmann, Andrés Nicolás Atamañuk, Graciela Aurora Ruiz, Raul Chirife, Maria Cristina Tentori, Simón Salzberg
BACKGROUND: The respiratory sinus arrhythmia (RSA) is the most common cardiac arrhythmia. It consists of phasic variations of sinus cycle length produced by an autonomic reflex, and is characterized by increased heart rate during inspiration and decline in expiration. This phenomenon is due to a reduction of the parasympathetic tone during inspiration, causing a rise in the heart rate, while during expiration the opposite phenomenon occurs. This arrhythmia is more frequent in young adults, although it can also be seen in any age group...
February 3, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28125405/av-nodal-reentrant-tachycardia-with-a-2-1-right-bundle-branch-block-missed-as-bidirectional-ventricular-tachycardia-in-the-first-superficial-evaluation
#16
Mohammad Ali Akbarzadeh, Isa Khaheshi, Mehdi Memaryan, Mohammad Parsa Mahjoob, Mohammadreza Naderian
A 95-year old woman was admitted to our emergency unit because of acute abdominal pain. After urgent surgery according to the acute abdomen, she was referred to intensive care unit (ICU) of the emergency unit as she was intubated. It was developed a run of new arrhythmia which was diagnosed by cardiology resident as bidirectional ventricular tachycardia due to beat to beat changing the axis of the QRS. However, a second and more precise evaluation of the abnormal ECG suggested a narrow supraventricular tachycardia, most probably AV nodal reentrant tachycardia with a 2:1 right bundle branch block...
January 25, 2017: Romanian Journal of Internal Medicine, Revue Roumaine de Médecine Interne
https://www.readbyqxmd.com/read/28117225/influence-of-2nd-degree-av-blocks-ecg-recording-length-and-recording-time-on-heart-rate-variability-analyses-in-horses
#17
B H Eggensperger, C C Schwarzwald
OBJECTIVES: To assess the influence of 2nd-degree AV blocks (AVB) on RR interval-based heart rate variability (HRV) variables; to investigate the effect of using PP interval time series and of artifact filtering on HRV analyses; to investigate the influence of electrocardiogram (ECG) recording length and time of recording; and to calculate day-to-day variability and reference intervals of HRV variables. ANIMALS: Thirty healthy adult horses. METHODS: RR and PP interval time series were extracted from 10-h Holter ECGs and an automated filter was applied to the RR time series (RRf)...
January 20, 2017: Journal of Veterinary Cardiology: the Official Journal of the European Society of Veterinary Cardiology
https://www.readbyqxmd.com/read/28114077/an-energy-efficient-ecg-signal-processor-detecting-cardiovascular-diseases-on-smartphone
#18
Sanjeev Kumar Jain, Basabi Bhaumik
A novel disease diagnostic algorithm for ECG signal processing based on forward search is implemented in Application Specific Integrated Circuit (ASIC) for cardiovascular disease diagnosis on smartphone. An ASIC is fabricated using 130-nm CMOS low leakage process technology. The area of our PQRST ASIC is 1.21 mm(2). The energy dissipation of PQRST ASIC is 96 pJ with a supply voltage of 0.9 V. The outputs from the ASIC are fed to an Android application that generates diagnostic report and can be sent to a cardiologist via email...
April 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28106024/-a-rare-cause-of-2-1-atrioventricular-block-and-congestive-heart-failure-in-preterm-infants-hypocalcemia
#19
Emine Azak, Hatice Tatar Aksoy, Handan Ünsal, İbrahim İlker Çetin
Atrioventricular (AV) block in the neonatal period is a rare disorder. It is frequently associated with underlying structural congenital heart disease and maternal lupus. Presently described is premature baby who developed 2:1 AV block and congestive heart failure due to hypocalcemia. Dramatic clinical improvement was observed following treatment of intravenous 10% calcium gluconate. Therefore, it is suggested that serum calcium level of newborns with AV block and congestive heart failure be measured.
January 2017: Türk Kardiyoloji Derneği Arşivi: Türk Kardiyoloji Derneğinin Yayın Organıdır
https://www.readbyqxmd.com/read/28100182/electrocardiographic-assessments-and-cardiac-events-after-fingolimod-first-dose-a-comprehensive-monitoring-study
#20
MULTICENTER STUDY
Volker Limmroth, Tjalf Ziemssen, Michael Lang, Stephan Richter, Bert Wagner, Judith Haas, Stephan Schmidt, Kathrin Gerbershagen, Christoph Lassek, Luisa Klotz, Olaf Hoffmann, Christian Albert, Katrin Schuh, Monika Baier-Ebert, Guillaume Wendt, Heinke Schieb, Susanne Hoyer, Ralf Dechend, Wilhelm Haverkamp
BACKGROUND: First dose observation for cardiac effects is required for fingolimod, but recommendations on the extent vary. This study aims to assess cardiac safety of fingolimod first dose. Individual bradyarrhythmic episodes were evaluated to assess the relevance of continuous electrocardiogram (ECG) monitoring. METHODS: START is an ongoing open-label, multi-center study. At the time of analysis 3951 patients were enrolled. The primary endpoints are the incidence of bradycardia (heart rate < 45 bpm) and second-/third-degree AV blocks during treatment initiation...
January 18, 2017: BMC Neurology
keyword
keyword
16813
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"