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Diastolic dysfunction after mediastinal irradiation.
Paul A Heidenreich1, Steven L Hancock, Randall H Vagelos
1Cardiology Section, VA Palo Alto Health Care System, Stanford University, Stanford, California, USA. pah@smi.stanford.edu
American Heart Journal
|November 18, 2005
Summary
Mediastinal irradiation can lead to diastolic dysfunction, impacting cardiac health. Early screening with echocardiography can identify patients at risk for future cardiac events after radiation therapy.
Area of Science:
- Cardiology
- Oncology
- Radiotherapy
Background:
- Mediastinal irradiation is a known risk factor for cardiac disease.
- The specific impact on left ventricular diastolic function remains unclear.
- This study investigates diastolic dysfunction prevalence and prognosis post-irradiation.
Purpose of the Study:
- To determine the prevalence of diastolic dysfunction in asymptomatic patients after mediastinal irradiation.
- To assess the association between diastolic dysfunction and prognosis in this cohort.
- To identify potential screening methods for at-risk patients.
Main Methods:
- Recruited 294 Hodgkin disease patients treated with ≥35 Gy mediastinal irradiation.
- Utilized resting and stress echocardiography, and nuclear scintigraphy for cardiac assessment.
- Monitored cardiac event-free survival over a 3.2-year follow-up period.
Main Results:
- Diastolic dysfunction was present in 14% of patients (mild 9%, moderate 5%).
- Patients with diastolic dysfunction showed higher rates of exercise-induced ischemia (23% vs. 11%).
- Diastolic dysfunction was linked to worse event-free survival (HR 1.66) after adjusting for covariates.
Conclusions:
- A significant prevalence of diastolic dysfunction exists in asymptomatic patients post-mediastinal irradiation.
- Diastolic dysfunction correlates with stress-induced ischemia and poorer prognosis.
- Doppler echocardiography screening may aid in identifying patients susceptible to cardiac events.