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Bundle branch block patterns, age, renal dysfunction, and heart failure mortality.

Peter A McCullough1, Sohail A Hassan, Vinay Pallekonda

  • 1Division of Cardiology, William Beaumont Hospital, Beaumont Health Center, 4949 Coolidge Highway, Royal Oak, MI 48073, United States. pmc975@yahoo.com

International Journal of Cardiology
|June 29, 2005
PubMed
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Bundle branch blocks in heart failure patients are linked to older age, reduced ejection fraction, and kidney issues. These patterns are associated with slightly increased mortality risk post-discharge.

Area of Science:

  • Cardiology
  • Clinical Medicine
  • Morbidity and Mortality Studies

Background:

  • Bundle branch block patterns in heart failure are not fully understood.
  • The relationship between these patterns and patient mortality requires further investigation.

Purpose of the Study:

  • To investigate the determinants of bundle branch block patterns in patients with decompensated heart failure.
  • To examine the association between bundle branch block patterns and all-cause mortality in this patient population.

Main Methods:

  • Analysis of 2907 intensive care unit patients with decompensated heart failure over 8 years.
  • Utilized multivariate techniques to analyze clinical and echocardiographic factors.
  • All-cause mortality data collected for over 99% of patients at a median of 23 months post-discharge.

Related Experiment Videos

Main Results:

  • Bundle branch blocks (Right: 7.3%, Left: 13.2%) were associated with older age, decreased left ventricular ejection fraction, and renal dysfunction.
  • Mortality rates were 46.1% (QRS<120 ms), 56.8% (Right bundle branch block), and 57.7% (Left bundle branch block).
  • Adjusted Cox models showed graded decrements in survival for bundle branch block patterns (p=0.03).

Conclusions:

  • Age, left ventricular dysfunction, and renal dysfunction are linked to bundle branch block patterns in severe heart failure.
  • Bundle branch block patterns are independently associated with slightly higher all-cause mortality after discharge, even after controlling for key factors.