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S Radhakrishnan

Publications and source records attributed to S Radhakrishnan.

119 records · Page 7Linked to original sources
PubMedDate not supplied

Color Doppler echocardiographic assessment of Sorin mitral prosthetic valve.

Doppler echocardiographic characteristics of 57 normally functioning Sorin prosthetic valves (a tilting valve) in the mitral position were studied in the early postoperative period. The three valve sizes (in mm) studied were: 25 (n = 15), 27 (n = 32) and 29 (n = 10). The mean gradients (mmHg) and the valve area (Sq cm) calculated by pressure half time method) for the three valve sizes were 3.46 +/- 1.69 and 2.49 +/- 0.26; 3.46 +/- 1.25 and 2.57 +/- 0.44; and 3.2 +/- 1.23 and 2.55 +/- 0.41; respectively. There was no significant difference in gradients and valve area between the three sizes, variations in pressure half time and therefore the calculated valve area was large. Color Doppler evaluation revealed a bifid nonturbulent jet directed anteriorly towards the interventricular septum. 12 patients (20%) had mild valvar and 7 (12%) had paravalvar mitral regurgitation (mild in 5 and moderate in 2) without any associated prosthetic valve dysfunction. The paravalvar regurgitation persisted in all the 5 patients restudied at 5-12 months postoperatively. Sorin prosthetic valves have similar gradients and valve area when compared to other disc valves. The incidence of of paravalvar regurgitation was slightly higher in our series. The limitations of Doppler derived gradients and area of prosthetic valve are discussed.

Adolescent↗
PubMedDate not supplied

Effect of atrial septal defect created during balloon mitral valvuloplasty on calculation of cardiac output and mitral valve area.

We studied the effect of atrial septal defect (ASD), produced during transseptal puncture, on estimation of cardiac output (CO) and mitral valve area (MVA), after successful balloon mitral valvuloplasty (BMV) using the Inoue balloon in 20 patients. Oximetry run, pressure gradients, thermodilution CO and MVA were measured initially while temporarily occluding the ASD by partially inflating the Inoue balloon catheter. Measurements were repeated after withdrawing the balloon catheter into the right atrium. Post-BMV cardiac output and MVA were similar in both the situations (4.52 +/- 1.37 L/min vs 4.50 +/- 1.19 L/min; 1.89 +/- 0.4 cm2 vs 1.93 +/- 0.38 cm2 respectively, p = ns). Only 2 patients showed a step up at atrial level on oximetry (9% and 16% respectively) but did not have significantly different CO or MVA, both with ASD occluded or otherwise. We conclude that the magnitude of ASD created during BMV by Inoue balloon technique is small and does not significantly affect the estimation of CO or MVA if the septal puncture is done in the fossa ovalis area.

Adolescent↗