Ventricular-Arterial Uncoupling and Hypertension Mediated Diastolic Dysfunction
Daniel Piskorz1, Luis Keller2, Luciano Citta2
1Cardiology Institute of the Rosario British Sanatorium, Jujuy 1540, floor 5th, 2000, Rosario, Argentina. danielpiskorz@ciudad.com.ar.
Summary
Ventricular-arterial uncoupling, a mismatch between the left ventricle and arteries, is common in hypertension. This study found that impaired ventricular-arterial coupling is linked to increased left ventricular hypertrophy and diastolic dysfunction.
Area of Science:
- Cardiology
- Physiology
- Hypertension Research
Background:
- Increased pulsatile afterload in hypertension can cause left ventricular (LV) afterload mismatch.
- Ventricular-arterial uncoupling is a suspected contributor to LV dysfunction in hypertensive patients.
Purpose of the Study:
- To determine the prevalence of ventricular-arterial uncoupling in hypertensive patients with preserved ejection fraction.
- To investigate the association between ventricular-arterial uncoupling, LV hypertrophy (LVH), and diastolic dysfunction (DD).
Main Methods:
- Observational study of 288 hypertensive patients with ejection fraction > 54%.
- Utilized 2D echocardiography and tissue Doppler to assess LV function.
- Measured end-systolic elastance (Ees), effective arterial elastance (Ea), and ventricular-arterial coupling (VAC) using the Chen single-beat method.
Main Results:
- Ventricular-arterial uncoupling (VAC) was frequently observed.
- Patients with the worst VAC showed significantly increased LV stroke volume and stroke work.
- Conversely, patients with the worst VAC had significantly reduced systolic stress and peripheral resistance index.
- The frequency of LVH or DD was significantly higher in patients with the worst VAC.
Conclusions:
- Ventricular-arterial uncoupling is prevalent in hypertension and associated with adverse LV remodeling.
- Impaired VAC is primarily driven by increased LV end-systolic elastance (Ees) rather than elevated arterial elastance (Ea).
- Ventricular-arterial uncoupling is a significant risk factor for developing LV hypertrophy and diastolic dysfunction in hypertensive individuals.
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