new echocardiography method to assess the progress of the left ventricular outflow tract obstruction in children

ABSTRACT

Discrete subaortic stenosis is considered an acquired cardiac defect of postnatal development; usually appear after the first year of life and causes LVOT of rapid hemodynamic progression. The relationship between ridgeseptal angle and progress of LVOTO has not been evaluated yet. Our objective was to evaluate the ridgeseptal angle as an important risk factor for progress of LVOT obstruction. 19 patients enrolled in this study, 12 in group one [RSA was right angle], 5 patients with acute angle in group two and 2 patients were in group three [oubtuse angle], follow-up echocardiography study every 6 months for 2 years to evaluate the progression of LVOT obstruction for each group. A total of 19 patients enrolled in this study [mean ages 5.5 +/- 1.7 mmHg] were diagnosed as isolated DSS, group [1] with right angle [RSA] showed that gradient increased 4 +/- 2.2 mmHg after 2 years, 2 +/- 2 mmHg, 2 +/- 1.2 mmHg in the other two groups [2and3] respectively. The results demonstrated that the maximum progressions in LVOTO were found in right angle group 4mmHg after two years with no statistical significance. Our results demonstrated that the maximum increase in LVOTO were found in the right angel [RSA] patients group where the hydraulic dynamic force was a maximum value. We recommended to measure the RSA echocardiography in every patient with DSS to assess how fast the progress of LVOTO