Clinical Report: Altered Myocardial Relaxation During Dipyridamole Stress Testing

Overview

This study investigates myocardial relaxation in patients with suspected early-stage heart failure with preserved ejection fraction (HFpEF) during dipyridamole stress echocardiography (DipSE).

Background

Heart failure with preserved ejection fraction (HFpEF) is a growing clinical concern, representing a significant portion of heart failure cases. Understanding the pathophysiology of early-stage HFpEF, particularly the role of coronary microvascular dysfunction (CMD), is crucial for developing targeted therapeutic strategies. This study aims to elucidate the effects of stress on left ventricular (LV) mechanics in patients with suspected early-stage HFpEF.

Data Highlights

Key Findings

• The E/e ratio significantly increased in suspected early-stage HFpEF patients (p < 0.001).
• IVRT remained significantly higher in suspected early-stage HFpEF patients compared to HHD patients (p < 0.001).
• Myocardial performance index (MPI) did not improve during DipSE in suspected early-stage HFpEF patients, unlike HHD patients (p = 0.005).
• Patients with ST-segment depression had worse MPI compared to those without it (p = 0.05).
• Coronary microvascular dysfunction (CMD) is implicated in the pathogenesis of HFpEF.

Clinical Implications

The findings suggest that dipyridamole stress echocardiography can reveal significant diastolic dysfunction in early-stage HFpEF, which may not be apparent at rest. Clinicians should consider the implications of CMD in the management of patients with suspected HFpEF, particularly those exhibiting ST-segment depression during stress testing.

Conclusion

This study highlights the association between increased LV filling pressure and impaired myocardial relaxation during stress in suspected early-stage HFpEF. Further research is warranted to explore the clinical significance of these findings.

Related Resources & Content

1. Clinical Research in Cardiology, 2023 -- Impact of Small Diameter Coronary Arteries on the Diagnostic Precision of Adenosine Stress Cardiac Magnetic Resonance Imaging
2. Clinical Research in Cardiology, 2023 -- Real-time cardiovascular magnetic resonance imaging for the non-invasive assessment of heart failure with preserved ejection fraction: outcomes from the HFpEF stress trial
3. European Journal of Preventive Cardiology, 2023 -- Chronotropic incompetence during exercise or pharmacological stress is associated with reduced survival in patients with chronic coronary syndromes
4. 2023 ACC Expert Consensus on Management of HFpEF: Key Points - American College of Cardiology
5. Impact of Coronary Microvascular Dysfunction in Heart Failure with Preserved Ejection Fraction: A Meta-Analysis | ESC Heart Failure | Oxford Academic
6. Clinical Research in Cardiology — Gender-Based Variations in Sequential Alterations of Coronary Blood Flow and Microvascular Function in Patients with Suspected Angina
7. Diagnostic frameworks and stress testing
8. Impact of Coronary Microvascular Dysfunction in Heart Failure with Preserved Ejection Fraction: A Meta-Analysis | ESC Heart Failure | Oxford Academic
9. Dipyridamole slows the rate of isovolumic pressure fall in patients with normal coronary arteries | European Heart Journal | Oxford Academic