Browsing by Author "Joy, J"

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    Assessment of severity of aortic stenosis by continuous wave Doppler echocardiography.
    (1990-09-01) Subramanyan, R; Srinivasan, M; Joy, J; Tharakan, J; Titus, T; Venkitachalam, C G; Balakrishnan, K G
    Fifty consecutive patients with aortic stenosis were evaluated by continuous wave Doppler echocardiography for assessment of the transaortic gradient. The Doppler derived gradients were compared with the gradients measured at cardiac catheterisation. Excellent correlation was found between the Doppler and catheterisation findings for the maximum instantaneous gradient (r = 0.92) and the mean systolic gradient (r = 0.84). The maximum, midsystolic and late systolic Doppler gradients also showed a good correlation with the peak to peak catheter gradient. The maximum Doppler velocity however, showed overestimation of the peak to peak gradient in the presence of mild aortic stenosis (predictive accuracy 86%). The midsystolic Doppler velocity showed the highest predictive accuracy (94%) for the detection of severe aortic stenosis. No case of severe aortic stenosis was missed by Doppler using either the maximum or midsystolic Doppler velocity. These findings indicate that continuous wave Doppler ultrasound provides a reliable estimate of the gradient in patients with aortic stenosis.
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    Coxsackie viral myocarditis: a clinical and echocardiographic study.
    (1990-11-01) Joy, J; Rao, Y Y; Raveendranath, M; Shanmugam, J; Balakrishnan, K G
    Thirty two patients with acute onset of cardiac symptoms following an episode suggestive of viral infection, were studied. 11 patients had Coxsackie viral myocarditis. All had 4 fold rise of neutralising Coxsackie viral antibody titres on paired sera tested. Coxsackie B virus types 2 and 4 were commonly detected. Among the eleven patients, 8 presented with congestive heart failure, 2 with ventricular arrhythmias and one with chest pain and S3 gallop. All had ECG changes. Echocardiographic examination showed global left ventricular dysfunction in 7, regional wall motion abnormalities in 2 and normal left ventricular function in one. Serial echocardiographic examination showed progressive myocardial dysfunction in 3 and improvement in myocardial function in two patients. Two patients died during the follow up period. Echocardiography helped in assessing the course of patients with viral myocarditis.
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    Double chambered right ventricle with anomalous muscle bundles and false tendons in the left ventricle.
    (1990-01-01) Joy, J; Subramanyan, R; Sandhyamani,; Balakrishnan, K G
    A patient with double chambered right ventricle, with anomalous muscle bundles and false tendons in the left ventricle, is described. This combination of anomalies may represent a failure of regression of foetal trabeculations.
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