Prognostic significance of bundle-branch block
in acute myocardial infarction: the importance of location and time of appearance.
Ellenbogen, "When right may not be right: right bundle-branch block
and response to cardiac resynchronization therapy," Circulation, vol.
(3-5) However, intermediate pretest probability patients with baseline ECG abnormalities such as electronically paced ventricular rhythm or left bundle-branch block
will require myocardial perfusion imaging.
These three key factors are patient age 75 years or greater, Killip class II-IV, and an ECG demonstrating anterior MI and/or left bundle-branch block, said Dr.
Three Risk Factors Predict Mortality in 15,078 Acute MI Patients Number of Risk Factors [*] 0 1 2 3 Percentage of Patients 46 41 11 2 Percent Mortality Within 30 Days 3 6 19 32 (*.) Risk factors are age 75 or older, Killip class II-IV, and ECG findings indicative of an anterior MI and/or left bundle-branch block. Source: Dr.
Incidence and clinical relevance of the occurrence of bundle-branch block
in patients treated with thrombolytic therapy.
Exclusion criteria were pulseless femoral arteries, a life-threatening arrhythmia, unstable blood pressure, a life expectancy of less than 12 months, contraindication to fibrinolysis, left bundle-branch block
, need for mechanical ventilation, previous coronary bypass surgery, renal failure, diabetes treated with metformin, and nonischemic heart disease.
Methods: Fifty-six patients with chronic heart failure and left bundle-branch block
(LBBB), who had undergone CRT, with mean age 59.9 [+ or -] 10.8 years, left ventricular ejection fraction 30.9 [+ or -] 8.3%, QRS 184 [+ or -] 35ms, FC (NYHA) II--16%, III--68% and IV--16%, were selected.
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).
Objective: Cardiac resynchronization therapy (CRT) is an adjunct treatment for heart failure (HF) which associates with left bundle-branch block
(LBBB) and is refractory to medical therapy.