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Variable responses of mitral valve motion and flow in systemic hypertension and in idiopathic dilated cardiomyopathy
Insights
Hypertension and cardiomyopathy similarly reduce early diastolic mitral valve function and flow. However, late diastolic function differs, with hypertension increasing flow velocity while cardiomyopathy decreases it.
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Diastolic dysfunction is a key feature of cardiovascular diseases.
- Understanding the relationship between mitral valve motion and transmitral flow is crucial for diagnosing heart conditions.
Purpose of the Study:
- To investigate the relationship between transmitral flow and mitral valve motion during diastole.
- To compare these parameters in healthy individuals, patients with hypertension, and patients with idiopathic dilated cardiomyopathy.
Main Methods:
- Utilized M-mode echograms to analyze mitral leaflet separation and E-F slope.
- Employed Pulsed Doppler to measure transmitral flow velocities and deceleration.
- Compared measurements between normal subjects, hypertensive patients, and cardiomyopathy patients.
Main Results:
- Both hypertension and cardiomyopathy showed reduced early diastolic mitral leaflet separation and flow velocity.
- Late diastolic leaflet separation was reduced in cardiomyopathy but similar in hypertension and controls.
- Late diastolic flow velocity increased in hypertension but remained unchanged in cardiomyopathy.
Conclusions:
- Hypertension and idiopathic dilated cardiomyopathy similarly impair early diastolic function.
- Late diastolic function is differentially affected by hypertension and cardiomyopathy.
- Transmitral flow and mitral valve motion analysis provides insights into diastolic dysfunction.
Abstract:
The relation between transmitral flow and diastolic mitral valve motion were examined in 17 normal persons, 14 patients with hypertension and 12 patients with idiopathic dilated cardiomyopathy. M-mode echograms were analyzed for early and late diastolic mitral leaflet separations, their ratio and E-F slope. Pulsed Doppler transmitral flow was analyzed for early and late velocities, their ratio and early flow deceleration. Early diastolic mitral valve leaflet separation was reduced in patients with hypertension (at 28 +/- 5 mm [p less than 0.05] ) and in patients with cardiomyopathy (at 22 +/- 3 mm [p less than 0.01] ). Flow velocity was also reduced in patients with hypertension (at 52 +/- 11 cm/s [p less than 0.05] ) and in patients with cardiomyopathy (at 48 +/- 15 cm/s [p less than 0.01] ). However, early leaflet separation and flow velocity were not related (r = 0.26). Late diastolic leaflet separation was similar (at 25 +/- 5 mm) in normal subjects and in those with hypertension (at 23 +/- 6 mm), but was reduced in patients with cardiomyopathy (at 18 +/- 3 mm [p less than 0.01] ). In contrast, late flow velocity was increased in patients with hypertension (at 52 +/- 12 cm/s [p less than 0.05] ) but unchanged in patients with cardiomyopathy (at 42 +/- 16 cm/s). The ratio of early to late leaflet separation was similar in all groups, whereas the ratio of flow velocities was reduced in hypertensive patients. Neither the E-F slope not early flow deceleration was altered in either pathologic group. Thus, hypertension and cardiomyopathy had similar effects in early rather than late diastole.(ABSTRACT TRUNCATED AT 250 WORDS)