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Acute myocardial infarction complicated by shock: outcome analysis based on initial electrocardiogram

Martin Jakl1, Josef Stasek, Petr Kala

  • 11st Department of Internal Medicine - Cardioangiology, University Hospital Hradec Kralove , Czech Republic.

Scandinavian Cardiovascular Journal : SCJ
|November 16, 2013
PubMed

Insights

Right bundle branch block (RBBB) on initial ECG in acute myocardial infarction patients is linked to higher cardiogenic shock risk and mortality. This finding highlights RBBB as a critical predictor for adverse outcomes.

Area of Science:

  • Cardiology
  • Critical Care Medicine
  • Electrocardiography

Background:

  • Acute myocardial infarction (AMI) can lead to cardiogenic shock (CS), a life-threatening condition.
  • Initial electrocardiogram (ECG) findings and patient risk factors are crucial for predicting outcomes in AMI patients.
  • Understanding the relationship between ECG patterns and CS development is vital for timely intervention.

Purpose of the Study:

  • To investigate the association between initial ECG findings, risk factors, coronary angiography results, and clinical outcomes in AMI patients with CS.
  • To determine the predictive value of different ECG classifications (STEMI, STDMI, BBBMI, other) for CS development and mortality.
  • To identify specific ECG patterns associated with severe coronary artery disease and poor prognosis.

Main Methods:

  • Analysis of data from 5572 AMI patients admitted to tertiary hospitals over 3 years.
  • Identification of 358 patients (6.4%) who developed CS on admission.
  • Classification of patients into four groups based on admission ECG: STEMI, STDMI, BBBMI, and other AMI ECG findings.

Main Results:

  • Cardiogenic shock occurred most frequently in bundle branch block myocardial infarction (BBBMI) patients (12.1%), particularly those with right bundle branch block (RBBB) (11.2%) and left bundle branch block (LBBB) (13.3%).
  • One-year mortality was highest in RBBB patients (66.7%) and LBBB patients (48.6%), significantly exceeding other ECG groups.
  • RBBB was associated with increased risk of CS, left main coronary artery disease, and unsuccessful revascularization.

Conclusions:

  • Right bundle branch block (RBBB) on admission ECG is a significant predictor of cardiogenic shock development in acute myocardial infarction.
  • RBBB is independently associated with the highest one-year mortality risk among AMI patients.
  • Early identification of RBBB on ECG is crucial for risk stratification and management of AMI patients prone to cardiogenic shock.
Abstract

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