• ventricles
  • Every heartbeat is orchestrated by an electrical impulse or charge that travels from the sinoatrial (SA) node controlling contraction of the left and right atria, to a substation - the bundle of His - located between the atria and the ventricles. (wisegeek.com)
  • Wolferth CC, Margolies A (1935) Asynchronism in contraction of the ventricles in the so-called common type of bundle-branch block: its bearing on the determination of the side of the significant lesion and on the mechanism of split first and second heart sound. (springer.com)
  • Depolarization of the heart ventricles occurs almost simultaneously, via the bundle of His and Purkinje fibers. (wikipedia.org)
  • fascicle
  • Additionally, the left bundle branch has two sub-branches, the antero-superior fascicle and the posteroinferior fascicle. (healthtap.com)
  • Although there is a delay or block in activation of the left anterior fascicle there is still preservation of initial left to right septal activation as well as preservation of the inferior activation of the LV (preservation, on the EKG, of septal Q waves in I and aVL and predominantly negative QRS complex in leads II, III, and aVF). (wikipedia.org)
  • Fascicular tachycardia usually arises from the posterior fascicle of the left bundle branch. (wikipedia.org)
  • congenital
  • The membranous septum comprises the upper and posterior portion of the IVS, separates the LV outflow tract (LVOT) from the right atrium and RV, and is a common site for congenital LV-right atrium communications (Gerbode defect). (lww.com)
  • Tetralogy of Fallot (TOF) is the most common cyanotic lesion and accounts for 10% of all congenital heart disease (CHD). (clinicalpainadvisor.com)
  • Possible causes of right bundle branch block may include a previous heart attack , a congenital deformity, or the result of developing cardiovascular disease, among other etiologies. (wisegeek.com)
  • Ironically, correction of congenital heart malformations is the most common cause of this condition in children in the US. (wisegeek.com)
  • A similar permanent block can affect adults undergoing late repair of congenital malformations or repair to valves that have been damaged by infection, cardiac disease or respiratory disease. (wisegeek.com)
  • The ostium secundum atrial septal defect is the most common type of atrial septal defect, and comprises 6-10% of all congenital heart diseases. (wikipedia.org)
  • Third-degree heart block may also be congenital and has been linked to the presence of lupus in the mother. (wikipedia.org)
  • The cause of congenital third-degree heart block in many patients is unknown. (wikipedia.org)
  • Studies suggest that the prevalence of congenital third-degree heart block is between 1 in 15,000 and 1 in 22,000 live births. (wikipedia.org)
  • patients
  • ST segment changes were less common in diabetic patients but left bundle branch block pattern was seen more often. (bmj.com)
  • A more helpful classification system for patients and their families may be considering these blocks as temporary or permanent in nature. (wisegeek.com)
  • Hypertension is very common in elderly patients. (oncologynurseadvisor.com)
  • Patients with third-degree AV block typically experience severe bradycardia (an abnormally-low measured heart rate), hypotension, and at times, hemodynamic instability. (wikipedia.org)
  • The prognosis of patients with complete heart block is generally poor without therapy. (wikipedia.org)
  • Patients with 1st and 2nd degree heart block are usually asymptomatic. (wikipedia.org)
  • Interventricular and intraventricular dyssynchrony are common in heart failure patients, regardless of QRS duration" (PDF). (wikipedia.org)
  • include
  • Very common (>10% incidence) adverse effects include: Nausea Sexual dysfunction (including anorgasmia (difficulty achieving an orgasm), erectile dysfunction, genital anaesthesia, ejaculation disorder, loss of libido etc. (wikipedia.org)
  • page needed] Insomnia Headache Dry mouth Common (1-10% incidence) adverse effects include: Changes in appetite Dyspepsia (indigestion) Tooth disorder Stomatitis Oropharyngeal disorder Flatulence Impaired urination Urinary frequency Agitation Abnormal dreams (including intense dreams or nightmares) Hypercholesterolaemia (elevated blood cholesterol) Dizziness Tremor Blurred vision Yawning Diarrhoea which is less common with paroxetine than with other SSRIs. (wikipedia.org)
  • relatively common
  • Mistakes in interpretation are relatively common, and the failure to identify high risk features has a negative effect on the quality of patient care. (wikipedia.org)
  • Other relatively common drugs including some antibiotics and antihistamines may also be a danger, in particular in combination with one another. (wikipedia.org)
  • impulse
  • A block in either of these two systems can be a complete failure - a "short" so to speak - or a delayed impulse. (wisegeek.com)
  • cause
  • A heart infection, myocarditis, is another cause of temporary blocks due to the muscle's tissue inflammation . (wisegeek.com)
  • In populations where hypertrophic cardiomyopathy is screened out prior to involvement in competitive athletics, it is a common cause of sudden cardiac death. (wikipedia.org)
  • The most common cause of the latter is orthostatic hypotension (also called postural hypotension). (wikipedia.org)
  • An inferior wall myocardial infarction may cause damage to the AV node, causing third-degree heart block. (wikipedia.org)
  • pulmonary
  • The RV outflow obstruction can be subvalvular, valvular, and/or supravalvular and may range in various combinations from infundibular narrowing (fixed or dynamic), pulmonary valve or annulus stenosis (80%) or atresia (20%), and hypoplasia of the main or branch pulmonary arteries to absence of the central pulmonary arteries. (clinicalpainadvisor.com)
  • heart block
  • Studies have shown that third-degree heart block in the setting of an inferior wall myocardial infarction typically resolves within 2 weeks. (wikipedia.org)
  • Hyperkalemia in those with previous cardiac disease and Lyme disease can also result in third-degree heart block. (wikipedia.org)
  • electrical
  • It is caused by a block in the "electrical wiring" of the heart which affects the appearance of the ekg. (healthtap.com)
  • Unfortunately, if enough of the electrical system is within an area of dead tissue, the resulting block may be permanent. (wisegeek.com)