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[Echocardiographic evaluation of left ventricular diastolic function in patients with aortic valve stenosis]
Insights
Left ventricular diastolic dysfunction in aortic valve stenosis worsens with myocardial hypertrophy, impacting blood flow patterns. Early diastolic filling changes precede systolic impairment, correlating with clinical presentation.
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Aortic valve stenosis (AVS) is a progressive condition affecting the heart's pumping chambers.
- Left ventricular diastolic dysfunction (LVDD) is an early indicator in AVS, preceding systolic impairment.
- The relationship between LVDD, myocardial hypertrophy severity, and clinical status in AVS requires further elucidation.
Purpose of the Study:
- To investigate left ventricular diastolic function in patients with isolated aortic valve stenosis.
- To assess the association between diastolic function, myocardial hypertrophy, and the clinical picture in AVS patients.
Main Methods:
- The study included 78 patients diagnosed with isolated aortic valve stenosis.
- Diagnostic methods involved echocardiography and cardiac catheterization.
- Patients were categorized based on the severity of left ventricular hypertrophy.
Main Results:
- Mild hypertrophy showed normal diastolic filling compared to healthy controls.
- Moderate hypertrophy revealed impaired early diastolic filling and prolonged deceleration time, with reduced pulmonary vein flow.
- Severe hypertrophy (mass > 180 g/m2) demonstrated pseudonormalization of mitral valve flow and increased early diastolic pulmonary vein flow.
- A significant correlation was found between the clinical presentation and mitral valve blood flow patterns.
Conclusions:
- Left ventricular diastolic function is significantly altered in aortic valve stenosis, with changes progressing with myocardial hypertrophy.
- Diastolic dysfunction patterns, including pseudonormalization, are associated with the severity of hypertrophy and influence the clinical presentation.
- These findings highlight the importance of assessing diastolic function in managing AVS.
Abstract:
Impairment of left ventricular diastolic function in aortic valve stenosis occurs very early and precedes the impairment of systolic function. Aim was to examine left ventricular diastolic function and its association with severity of myocardial hypertrophy and clinical picture. The paper comprised 78 patients with isolated aortic valve stenosis in whom were performed ultrasonography and catheterization. No significant differences in parameters of diastolic filling were observed in patients with mild hypertrophy and preserved systolic function compared to healthy subjects. In patients with moderate myocardial hypertrophy, left ventricular filling was decreased in an early diastole (Emax 51 +/- 5 cm/s, Evti 6.4 +/- 1.1 cm) and increased in late diastole (Amax 88 +/- 11 cm/s, Avti 11.4 +/- 1.8 cm), while deceleration time was prolonged (DT 171 +/- 32 ms). Pulmonary vein flow was decreased during diastole (Dmax 33 +/- 5 cm/s, Dvti 7.6 +/- 2 cm). Pseudonormalization of flow through mitral valve was observed in patients with pronounced hypertrophy of left ventricular wall (mass > 180 g/m2): increase of the velocity during the phase of fast left ventricular filling (Emax 72 +/- 13 cm/s, Evti 9.8 +/- 2.1 cm), decrease during atrial contraction (Amax 31 +/- 6 cm/s, Avti 3.7 +/- 0.4 cm), reduction in deceleration time (DT 116 +/- 11 ms), while pulmonary vein flow velocity was increased during the early diastole (Dmax 64 +/- 17 cm/s, Dvti 10.7 +/- 2.2 cm). Likewise, significant correlation between clinical picture and type of blood flow through mitral valve was observed.