Read by QxMD icon Read

sinus node

Paulina Haro, Hugo A Ruiz-Piña, Elsy B Canché-Pool, Salvador Medina, Julio A Mercado
  The aim of the present study is to determine the basal parameters in opossums ( Didelphis virginiana) during physical examination in Yucatan, Mexico. Sixty-six opossums were captured and manually handled for physical examinations. Sex, age, cardiac and respiratory rate, body temperature, pulse, mucous membranes, capillary refill time, hydration, size of superficial lymph nodes, mental status, and body condition were evaluated. Also, comparisons between rectal and auricular temperatures were performed. The means of physiological parameters obtained were: cardiac frequency 146 beats per minute (95% confidence interval [CI]: 138...
June 2018: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
Ruxiu Liu, Jie Li, Yu Liu, Jie Peng, Xuanke Guan
Objective: We investigated the role of astragaloside in the treatment of sick sinus syndrome (SSS). Methods: Neonatal New Zealand rabbits were selected for the study. Rabbit sinoatrial node (SAN) cells were isolated by the method of dual enzymatic digestion and differential adherence. The injury model was prepared through simulated ischemia and reperfusion (I/R), and changes in the pacemaker current ( I f ) were recorded using the whole-cell patch-clamp technique. The proteins F-actin and vinculin were examined between various groups of SAN cells using a microplate reader and laser scanning confocal microscopy...
2018: Frontiers in Pharmacology
Matthias Graf, Patrick Stiller, Martin Karch
Symptomatic bradycardia is usually caused by abnormalities of atrioventricular conduction or sinus node dysfunction. Reversible and irreversible causes must be considered.Temporary pacemakers are used in the emergency treatment in case of severe bradyarrhythmia.They help to bridge the acute phase until spontaneous restoration of atrioventricular or sinus node function or -if spontaneous restoration fails- until a permanent pacemaker system was implanted.In the following article we discuss the commonly used temporary pacemaker systems...
June 2018: Deutsche Medizinische Wochenschrift
Shinsuke Miyazaki, Takatsugu Kajiyama, Tomonori Watanabe, Masahiro Hada, Kazuya Yamao, Hiroaki Nakamura, Hitoshi Hachiya, Hiroshi Tada, Kenzo Hirao, Yoshito Iesaka
BACKGROUND: Vagal reactions of the sinus node during pulmonary vein isolation (PVI) have been reported, however, data on intra-procedural atrioventricular conduction disturbances have been sparse. The present study aimed to investigate the clinical characteristics of atrioventricular conduction block (AVB) during PVI using second-generation cryoballoons. METHODS: A total of 2252 PVs among 568 consecutive atrial fibrillation patients undergoing PVI with 28-mm cryoballoons were analyzed...
August 15, 2018: International Journal of Cardiology
James L Cox, Niv Ad, Andrei Churyla, S Chris Malaisrie, Duc Thinh Pham, Jane Kruse, Olga Kislitsina, Patrick M McCarthy
BACKGROUND: There is concern that the right atrial lesions of the Maze procedure lead to more permanent pacemakers postoperatively and that they provide little therapeutic advantage over left atrial lesions alone. METHODS: A discussion of the pertinent anatomy related to atrial fibrillation and the performance of the Maze procedure, the potential ways that the specialized conduction system could theoretically be damaged by the procedure, non-procedure-related causes for increased postoperative pacemaker requirements, and the basis for the efficacy of the right atrial lesions of the Maze procedure are presented...
June 5, 2018: Annals of Thoracic Surgery
Yasuaki Tanaka, Atsushi Takahashi, Takamitsu Takagi, Jun Nakajima, Katsumasa Takagi, Hiroyuki Hikita, Masahiko Goya, Kenzo Hirao
BACKGROUND: The aim of this study was to categorize the conduction patterns between the right atrium (RA) and the superior vena cava (SVC), and to determine the ideal procedure for SVC isolation using a novel high-resolution mapping system.Methods and Results:RA-SVC conduction was evaluated using the RHYTHMIA system in 113 patients (age 62.8±11.5 years, paroxysmal: 67) with atrial fibrillation (AF) after pulmonary vein (PV) isolation. In 56 patients, a line of conduction block was found to run obliquely just above the sinus node (Block group)...
June 7, 2018: Circulation Journal: Official Journal of the Japanese Circulation Society
Stewart Spence, Elena Pena, Rebecca E Thornhill, Pablo B Nery, David H Birnie
Presented is the case of a 62-year old male with a history of sarcoidosis and sinus node dysfunction, who underwent late gadolinium enhancement magnetic resonance imaging, which demonstrated left ventricular hyperenhancement and bi-atrial fibrosis.
May 2018: Oxford Medical Case Reports
Massimo Stefano Silvetti, Vincenzo Pazzano, Irma Battipaglia, Corrado Di Mambro, Camilla Calvieri, Fabio Anselmo Saputo, Letizia Verticelli, Adriano Carotti, Sergio Torcinaro, Fabrizio Drago
AIMS: Young patients with operated complex congenital heart defects (CHD) often develop sinus node dysfunction (SND) requiring permanent pacing with rate-responsive function. Activity-driven sensors cannot account for non-movement stress and cannot modulate heart rate physiologically. Closed Loop Stimulation (CLS, Biotronik, Berlin, Germany) is a physiological rate-responsive pacemaker based on the indirect measure of ventricular contractility. No data are available on the effects of such pacing strategy in young patients...
June 6, 2018: Pacing and Clinical Electrophysiology: PACE
Janaki Rami Reddy Manne
Medications that are routinely used in clinical practice to treat hypertension such as beta blockers or non-dihydropyridine calcium channel blockers can depress sinus node function, resulting in symptoms and electrocardiographic changes consistent with sinus node dysfunction. In some patients, medications are potentially a reversible cause of apparent sinus node dysfunction. We report a patient who was taking atenolol for hypertension presented with recurrent near syncopal spells due to atenolol-induced sinus node dysfunction manifested in the form of an interesting and rare arrhythmia known as Escape-capture bigeminy...
May 2018: Oxford Medical Case Reports
Christopher G Przybycin, Holly L Harper, Jordan P Reynolds, Cristina Magi-Galluzzi, Jane K Nguyen, Angela Wu, Ankur R Sangoi, Peter S Liu, Saleem Umar, Rohit Mehra, Xiaochun Zhang, Roni M Cox, Jesse K McKenney
The incidence of renal cell carcinoma (RCC) is known to be higher in patients with end-stage renal disease, including those with acquired cystic kidney disease due to dialysis. Acquired cystic disease (ACD)-associated RCC was recently incorporated into the 2016 WHO Classification of Tumors of the Urinary System and Male Genital Tract as a distinct entity and is reportedly the most common RCC arising in end-stage renal disease. In this study, we sought to further describe clinicopathologic findings in a large series of ACD-RCC, emphasizing histologic features, immunophenotype, clinical outcome, and patterns of disease spread...
May 30, 2018: American Journal of Surgical Pathology
Yasushi Imai, Yasuhiro Yokoyama, Tomonori Watanabe
No abstract text is available yet for this article.
2018: International Heart Journal
Pietro Palmisano, Matteo Ziacchi, Ernesto Ammendola, Gabriele Dell'Era, Federico Guerra, Vittorio Aspromonte, Giuseppe Boriani, Gerardo Nigro, Eraldo Occhetta, Alessandro Capucci, Renato Pietro Ricci, Giampiero Maglia, Mauro Biffi, Michele Accogli
AIMS: Knowledge of the long-term progression of rhythm disorders requiring pacemaker implantation could have significant implications for the choice of device and its management during follow-up. Accordingly, we conducted an observational study to analyse the long-term progression of rhythm disorders requiring pacemaker implantation. METHODS: This multicentre, observational study enrolled 1810 pacemaker patients (age 71.6 ± 13.3 years, men 53.8%) consecutively evaluated during scheduled pacemaker follow-up visits...
May 24, 2018: Journal of Cardiovascular Medicine
Jean-Claude Deharo, Michele Brignole, Régis Guieu
Adenosine is a ubiquitous substance that is released under several physiological and pathological conditions and has cardiovascular effects including cardioinhibition and vasodilation. It has been shown to be an important modulator implicated in several forms of syncope. In patients with chronic low plasma levels of adenosine, a transient release of endogenous adenosine can be sufficient to block conduction in the atrioventricular node and induce prolonged asystole; conversely, when plasma adenosine levels are chronically high, adenosine release is responsible for vasodepression...
May 29, 2018: Herzschrittmachertherapie & Elektrophysiologie
J L Liu, L Y Zhang, D F Yao, J E Li
Objective: To study the clinical features and nasal image of children with nasal tumors. Method: The samples of 40 cases of pediatric nasal tumors, which were diagnosed based on pathology, were collected. Clinical features, pathological histology and imaging characteristics were also summarized. Result: There were 23 cases of benign tumors and 17 cases of malignancy. The most common benign tumors were angiofibroma (7 cases), capillary hemangioma (4 cases) and ossifying fibroma (4 cases), while the most common malignant tumors were lymphoma (10 cases) and embryonal rhabdomyosarcoma (3 cases)...
October 20, 2017: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
Yujie Zhang, Jing Yang, Mingfang Zhang, Zhaowei Meng, Wenjing Song, Long Yang, Liming Li, Dan Wang, Tao Shi
RATIONALE: Thyroid follicular carcinoma-like renal tumor (TFCLRT) is a rare primary renal epithelial tumor that was first reported in 2006. We report a case diagnosed of TFCLRT by us to observe the pathological feature and analyze comparatively the clinical and pathologic characteristics with all cases of reviewed literatures. PATIENT CONCERNS: A 54-year-old female patient had the urinary frequency with the symptom of right flank pain with a history of more than half a year of hypertension and received uterine fibroid resection 12 years ago...
May 2018: Medicine (Baltimore)
Lei Sen, Fengpeng Jia, Quan He, Lingyun Gao, Suxin Luo, Han Lei, Dennis W X Zhu
BACKGROUND: The understanding of spontaneous scar based reentrant atrial arrhythmia is limited. We aim to characterize the electrophysiologic and mapping features of spontaneous scar based atrial flutter (AFL) and outcomes of catheter ablation. METHODS: Consecutive patients with a diagnosis of AFL who underwent catheter ablation from Jan 2012 to Jun 2015 were screened. Scars were detected in 12 patients and were included in this study. All had negative coronary angiography...
May 23, 2018: Pacing and Clinical Electrophysiology: PACE
Hazuki Otani, Masakazu Notsu, Sayo Koike, Miwa Morita, Masahiro Yamamoto, Mika Yamauchi, Takahumi Fuchiwaki, Ichiro Morikura, Noriaki Aoi, Hideyuki Kawauchi, Teruaki Iwabashi, Asuka Araki, Noriyoshi Ishikawa, Riruke Maruyama, Toshitsugu Sugimoto
Background: The thyroid gland is resistant to microbial infection, because of its organ characteristics such as encapsulation, iodine content, and rich blood supply. Therefore, acute suppurative thyroiditis (AST), as a bacterial infection of the thyroid gland, is rarely seen. AST typically takes places on the left side the neck region in children, because of the coincidence of the left piriform sinus fistula, as a most common route of infection. AST is also usually seen in immunocompromised hosts...
2018: Thyroid Research
Ram Sewak Singh, Barjinder Singh Saini, Ramesh Kumar Sunkaria
Objective: Cardiovascular diseases generate the highest mortality in the globe population, mainly due to coronary artery disease (CAD) like arrhythmia, myocardial infarction and heart failure. Therefore, an early identification of CAD and diagnosis is essential. For this, we have proposed a new approach to detect the CAD patients using heart rate variability (HRV) signals. This approach is based on subspaces decomposition of HRV signals using multiscale wavelet packet (MSWP) transform and entropy features extracted from decomposed HRV signals...
2018: Clujul Medical (1957)
Roberto De Ponti, Jacopo Marazzato, Giuseppe Bagliani, Fabio M Leonelli, Luigi Padeletti
The sick sinus syndrome includes symptoms and signs related to sinus node dysfunction. This can be caused by intrinsic abnormal impulse formation and/or propagation from the sinus node or, in some cases, by extrinsic reversible causes. Careful evaluation of symptoms and of the electrocardiogram is of crucial importance, because diagnosis is mainly based on these 2 elements. In some cases, the pathophysiologic mechanism that induces sinus node dysfunction also favors the onset of atrial arrhythmias, which results in a more complex clinical condition, known as "bradycardia-tachycardia syndrome...
June 2018: Cardiac Electrophysiology Clinics
Zhaolong Xu, Renguang Liu, Qinghua Chang, Changjun Li
BACKGROUND: Preexcitation syndrome is characterized by a dominant delta wave on the baseline electrocardiogram (ECG), resulting from the change in QRS initial vector by the accessory pathway (AP). This study is to explore the effect of ventricular preexcitation on the QRS initial, maximal and terminal vector in an experimental rabbit with preexcitation syndrome induced by programmed electrical stimulation. METHODS: Rabbits (n = 10) were randomized for the experimental model of ventricular preexcitation...
May 21, 2018: BMC Cardiovascular Disorders
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"