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Related Experiment Videos

[Dynamic left ventricular outflow tract obstruction induced by exercise].

Fernando Cabrera Bueno1, Isabel Rodríguez Bailón, Raúl López Salguero

  • 1Servicio de Cardiología, Hospital Universitario Virgen de la Victoria, Málaga, Spain. fonendo@hotmail.com

Revista Espanola De Cardiologia
|December 25, 2004
PubMed
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Dynamic left ventricular outflow tract obstruction can occur during exertion in patients experiencing angina or dyspnea without underlying heart disease. This study found effort-induced obstruction in 13.4% of patients, with left ventricular outflow tract size as a key predictor.

Area of Science:

  • Cardiology
  • Cardiovascular Physiology
  • Diagnostic Imaging

Background:

  • Dynamic left intraventricular outflow tract obstruction is occasionally observed in patients without hypertrophic cardiomyopathy.
  • The occurrence of dynamic intraventricular obstruction during exertion in patients with unexplained angina or dyspnea is not well-established.

Purpose of the Study:

  • To investigate the appearance of dynamic intraventricular obstruction during effort.
  • To determine its incidence, magnitude, and predictive factors.
  • To analyze its clinical course in patients with angina or dyspnea.

Main Methods:

  • Prospective study involving 211 patients with angina, dyspnea, or both undergoing stress Doppler echocardiography.
  • Exclusion criteria included prior myocardial infarction, valvular heart disease, ventricular dysfunction, or hypertrophy without hypertension.

Related Experiment Videos

  • Dynamic intraventricular obstruction defined as intracavitary flow velocity ≥ 2.5 m/s.

    • Main Results:

    • 134 patients were analyzed; 18 (13.4%) developed dynamic intraventricular obstruction with gradients of 25-53 mmHg.
    • Left ventricular outflow tract size was the sole independent predictive factor identified in multivariate analysis.
    • Patients with symptoms during exercise showed significantly higher gradients (42.65 mmHg) compared to asymptomatic patients (28.15 mmHg).

    Conclusions:

    • Effort-induced dynamic left ventricular outflow tract obstruction may occur in patients presenting with angina or dyspnea without evidence of ischemia.
    • Left ventricular outflow tract size is a significant determinant of this condition.
    • No cardiac events were observed during the follow-up period.