• ischemic heart d
  • It can be seen in myocardial ischemia, propranolol use, digitalis use, rheumatic fever, and chronically in ischemic heart disease and other structural diseases (amyloidosis, mitral valve prolapse, aortic valve disease, and atrial septal defect. (wikipedia.org)
  • block
  • Second-degree atrioventricular block (AV block) is a disease of the electrical conduction system of the heart. (wikipedia.org)
  • It is classified as a block of the AV node and is categorized in between first-degree (slowed conduction) and third degree blocks (complete block). (wikipedia.org)
  • Type 1 second-degree heart block is considered a more benign entity than type 2 second-degree heart block with type 1 not having structural changes found on histology. (wikipedia.org)
  • Today, Mobitz I heart block is characterized by progressive prolongation of the PR interval on consecutive beats followed by a blocked P wave (i.e., a 'dropped' QRS complex). (wikipedia.org)
  • Mobitz II heart block is characterized on a surface ECG by intermittently nonconducted P waves not preceded by PR prolongation and not followed by PR shortening. (wikipedia.org)
  • BUFFALO, N.Y. -- Heart failure patients with a condition called "heart block" derive significant benefit from cardiac resynchronization therapy (CRT), according to the results of the Block HF clinical trial, presented today at the American Heart Association Scientific Sessions 2012 meeting in Los Angeles. (buffalo.edu)
  • These findings confirm what some clinicians and researchers have hypothesized for some time -- that heart failure patients with heart block do better when both sides of the heart are resynchronized, called biventricular pacing, using a cardiac resynchronization therapy (CRT) device," she says. (buffalo.edu)
  • The results of Block HF may lead to a reassessment of treatment guidelines for heart failure patients with heart block. (buffalo.edu)
  • 2-5 Additionally, patients with mutations in Nkx2-5 exhibit congenital heart defects and conduction system disease, notable for progressive atrioventricular block. (ahajournals.org)
  • A bundle branch block is a defect of the bundle branches or fascicles in the electrical conduction system of the heart. (wikipedia.org)
  • Type 2 is almost always due to organic disease involving the conduction system and may lead to complete heart block . (healthtap.com)
  • Morbitz 1 atrioventricular block (wenkebach) is common and usually benign, and asymptotic. (healthtap.com)
  • What is second degree atrioventricular block or wenckebach phenomenon. (healthtap.com)
  • This type of heart block is not a serious or life threatening problem. (healthtap.com)
  • I was just diagnoses with a wenckebach heart block. (healthtap.com)
  • I haves SVT + wenckebach and atypical wenckebach - should I take medication for SVT even if it can worsen the heart block? (healthtap.com)
  • Cases of second or third degree atrioventricular block have been reported. (thebody.com)
  • First-degree atrioventricular block (AV block), or PR prolongation, is a disease of the electrical conduction system of the heart in which the PR interval is lengthened beyond 0.20 seconds. (wikipedia.org)
  • The most common causes of first-degree heart block are an AV nodal disease, enhanced vagal tone (for example in athletes), myocarditis, acute myocardial infarction (especially acute inferior MI), electrolyte disturbances and medication. (wikipedia.org)
  • The drugs that most commonly cause first-degree heart block are those that increase the refractory time of the AV node, thereby slowing AV conduction. (wikipedia.org)
  • In first-degree heart block, the diseased AV node conducts the electrical activity more slowly. (wikipedia.org)
  • First-degree heart block does not require any particular investigations except for electrolyte and drug screens, especially if an overdose is suspected. (wikipedia.org)
  • Even though it usually does not progress to higher forms of heart block, it may require outpatient follow-up and monitoring of the ECG, especially if there is a comorbid bundle branch block. (wikipedia.org)
  • Isolated first-degree heart block has no direct clinical consequences. (wikipedia.org)
  • A subset of individuals with the triad of first-degree heart block, right bundle branch block, and either left anterior fascicular block or left posterior fascicular block (known as trifascicular block) may be at an increased risk of progression to complete heart block. (wikipedia.org)
  • Temporary epicardial pacing is used during open heart surgery should the surgical procedure create atrio-ventricular block. (wikipedia.org)
  • palpitations
  • If untreated, symptoms may include loss of the ability to move one or both sides of the face, joint pains, severe headaches with neck stiffness, or heart palpitations, among others. (wikipedia.org)
  • diseases
  • Specialists who focus on diseases of the heart are called cardiologists, although many specialties of medicine may be involved in treatment. (wikipedia.org)
  • Atrial flutter occurs most often in people with heart diseases such as pericarditis, coronary artery disease and cardiomyopathy. (heart.org)
  • It may be also be due to onset of acute coronary syndrome, heart failure, conduction system diseases with enhanced automaticity, or administration of theophylline. (wikipedia.org)
  • fibers
  • These specialized muscle fibers in the heart were named after the Swiss cardiologist Wilhelm His, Jr., who discovered them in 1893. (wikipedia.org)
  • normal
  • In normal physiologic states, the output of the heart is pulsatile, and the venous inflow to the heart is continuous and non-pulsatile. (wikipedia.org)
  • right ventricle
  • The heart receives blood low in oxygen from the systemic circulation, which enters the right atrium from the superior and inferior venae cavae and passes to the right ventricle. (wikipedia.org)
  • The right atrium and the right ventricle together are sometimes referred to as the right heart. (wikipedia.org)
  • Various types of pacing leads have been developed for endocardial introduction into different chambers of a patient's heart, typically a right ventricle, right atrial appendage, or coronary sinus. (google.com)
  • In a conventional dual chamber system, leads function in both the right atrium and right ventricle. (google.com)
  • diagnosis
  • Diagnosis of heart disease is often done by the taking of a medical history, listening to the heart-sounds with a stethoscope, ECG, and ultrasound. (wikipedia.org)
  • sudden cardi
  • Her research interests include clinical trials in implantable device therapy for prevention of sudden cardiac death and management of heart failure, as well as clinical trials in atrial fibrillation. (buffalo.edu)
  • Adult
  • An adult heart has a mass of 250-350 grams (9-12 oz). (wikipedia.org)
  • Of the transcription factors implicated in the regulation of the developmental process, transcription factor Tbx3 is expressed specifically in the central conduction system, thus providing a key marker with which to delineate these tissues throughout development and in the adult. (ahajournals.org)
  • Hop −/− adult mice display conduction defects below the atrioventricular node (AVN) as determined by invasive electrophysiological testing. (ahajournals.org)