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Left ventricular ejection dynamics in hypertrophic cardiomyopathy and aortic stenosis: comparison with the use of
Insights
Doppler echocardiography reveals distinct left ventricular ejection dynamics in hypertrophic cardiomyopathy (HCM) and aortic stenosis (AS). Both conditions show elevated peak flow velocities compared to normal subjects, with HCM exhibiting prolonged ejection times.
Area of Science:
- Cardiology
- Echocardiography
- Cardiovascular Physiology
Background:
- Hypertrophic cardiomyopathy (HCM) and valvular aortic stenosis (AS) are significant cardiac conditions affecting left ventricular (LV) function.
- Understanding the nuances of LV ejection dynamics is crucial for diagnosis and management.
Purpose of the Study:
- To compare LV ejection dynamics between patients with obstructive HCM (HOCM), nonobstructive HCM (HNCM), AS, and normal subjects.
- To identify specific echocardiographic parameters that differentiate these conditions.
Main Methods:
- Combined two-dimensional and Doppler echocardiography was utilized.
- LV ejection dynamics were assessed in 15 HOCM patients, 6 HNCM patients, 10 AS patients, and 12 age-matched normal controls.
Main Results:
- Doppler peak flow velocities were significantly higher in HOCM, HNCM, and AS compared to normal subjects (p < 0.001), but not different among HOCM, HNCM, and AS.
- Time to peak velocity was higher in HOCM than in HNCM and normal groups (p < 0.001), but similar to AS.
- Total ejection time was prolonged in HOCM compared to HNCM and normal groups (p < 0.001), and similar to AS.
Conclusions:
- Both obstructive and nonobstructive HCM, as well as AS, exhibit elevated peak ejection flow velocities.
- Prolonged ejection time is a characteristic finding in obstructive HCM, distinguishing it from nonobstructive HCM and normal subjects.
- Echocardiographic assessment of LV ejection dynamics provides valuable insights into the pathophysiology of HCM and AS.
Abstract:
Left ventricular ejection dynamics of 15 patients with hypertrophic cardiomyopathy (nine obstructive, six nonobstructive) were compared to those in 12 age-matched normal subjects and 10 patients with valvular aortic stenosis by means of combined two-dimensional and Doppler echocardiography. Doppler peak flow velocities in obstructive (HOCM, 2.5 +/- 1.3 m/sec) and nonobstructive (HNCM, 2.6 +/- 0.6 m/sec) hypertrophic cardiomyopathy, as well as in patients with aortic stenosis (AS, 3.6 +/- 1.3 m/sec) were significantly higher than in the normal population (1.0 +/- 0.2 m/sec; p less than 0.001 for all comparisons), but did not differ from each other. The HOCM patients had time to peak velocity (154 +/- 55.7 msec) that was higher than that in both HNCM (86 +/- 8.4 msec) and normal groups (84.5 +/- 8.9 msec; p less than 0.001 for both comparisons), but did not differ from those in AS (117 +/- 52.5 msec). The total ejection time did not differ between HOCM (348.2 +/- 91.1 msec) and AS (328.8 +/- 30.4 msec) groups, but was prolonged in HOCM compared to HNCM (198 +/- 21.0 msec) and normal groups (233 +/- 28.3 msec; p less than 0.001 for both comparisons). The normal and HNCM groups did not differ in time to peak or total ejection time measurements. The percent of flow velocity present in the initial third of the systolic velocity integral for HOCM (44.5% +/- 5.9) and HNCM (49.4% +/- 2.5) groups was greater than for normals (36.2% +/- 5.4; p less than 0.05 for both comparisons), but HOCM values did not differ from HNCM values.(ABSTRACT TRUNCATED AT 250 WORDS)