right bundle branch block

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right bundle branch block (RBBB)

impaired transmission or absence of transmission of electric impulses from the atrioventricular (AV) bundle of His to the right ventricle. The block may be complete or incomplete and may be caused by a lesion in the right bundle branch or a small, focal lesion in the AV bundle. RBBB is often associated with right ventricular hypertrophy, especially in athletes and individuals under 40 years of age. In older individuals RBBB is commonly caused by coronary artery disease. A complete RBBB commonly occurs after surgical closure of a ventricular septal defect.

right bundle branch block

Cardiology A condition in which the electrical impulse from the bundle of His to the ventricles is delayed or fails to conduct along the right bundle branch, resulting in right ventricular depolarization by cell-to-cell conduction spreading from the interventricular septum and left ventricle to the right ventricle–ie, slow and uncoordinated Natural history Surgically induced RBBB has few acute hemodynamic consequences and a generally benign course long term; rarely, progression to complete heart block and sudden death occur, especially if accompanied by major His-Purkinje system–eg, left anterior hemiblock, first-degree AV block–injury; tetralogy of Fallot repair with an RBBB and a markedly prolonged QRS duration >180 ms have an ↑ risk for ventricular arrhythmias and sudden death; familial RBBB may be benign or, if it occurs in Kearns-Sayre syndrome or Brugada syndrome, potentially fatal Clinical Children with RBBB may have Hx of congenital heart disease, heart surgery–eg, VSD, palpitations, ↓ energy/activity/exercise tolerance, dizziness, syncope, familial Hx of arrhythmias–eg, BBB, complete heart block, pacemaker/defibrillator, premature or sudden unexplained death, acute MI under age 45; persistently split 2nd HS EKG Lead V1–late intrisicoid deflection, M-shaped QRS, wide R or occasionally qR; lead V6–early intinsicoid deflection, wide S; lead I–wide S Management Pacemaker, if syncope or significant arrhythmias Followup Telemetry prn; annual EKG. See Bundle branch block. Cf Left bundle branch block.

right bundle branch block

Abbreviation: RBBB
A defect in the conductive system of the heart in which electrical conduction down the right bundle branch is delayed. On the 12-lead EKG, it gives the widened QRS complex an RSR appearance in leads V1 and V2.
References in periodicals archive ?
Risk of right bundle-branch block and complete heart block during pulmonary artery catheterization.
Acronyms aVF: augmented voltage unipolar left foot lead LBBB: left bundle-branch block RVEDV: right ventricular end diastolic volume aVL: augmented voltage unipolar left arm lead PLAX: parasternal long axis view RVEF: right ventricular ejection fraction BSA: body surface area PSAX: parasternal short axis view 3705 SJHIU WFOUSJDVMBS PVUEPX USBDU ECG: electrocardiogram RBBB: right bundle-branch block SAECG: signal averaged electrocardiogram FAC: fractional area change RV: right ventricular VT: ventricular tachycardia 'Modifications of the orginal criteria have been proposed to facilitate clinical diagnosis in first-degree relatives who often have incomplete expression of the disease.
Right bundle-branch block in anterior acute myocardial infarction in the coronary intervention era: acute angiographic findings and prognosis.
Exclusion criteria: Presence of an atrial fibrillation (AF) and/or a right bundle-branch block, and/or a hypertrophic cardiomyopathy, and/or a congenital cardiopathy.
Among them, 28 patients were excluded due to: AF (19 patients), hypertrophic cardiomyopathy (3 patients), right bundle-branch block (3 patients), congenital cardiopathy (1 patient), lack of pre-implantation data (2 patients).
Right bundle-branch block and ST-segment elevation in leads [V.
In 1992, Brugada and Brugada described a new syndrome consisted of right bundle-branch block, ST segment elevation in the right precordial electrocardiogram (ECG) leads and an increased risk of sudden cardiac death (1).
After preliminary clinical evaluation, 33 patients were excluded, 2 for having right bundle-branch block and 31 because of their total dependence on the pacemaker (therefore, baseline rhythm was not assessed).