Valve replacement for chronic mitral insufficiency; long-term follow up using technetium pertechnetate scintigraphy.
Technetium Pertechnetate Scintigraphy was performed in 12 patients (9 men and 3 women, average age 48 +/- 13 years) on an average 19.8 +/- 11 months after valve replacement for chronic mitral insufficiency. Preoperative conventional ventriculography had revealed increased enddiastolic and endsystolic volumes (230.9 +/- 66 resp. 73.5 +/- 26 ml). 59.4 +/- 9% of the stroke volume (157.5 +/- 47 ml) regurgitated into the left atrium. Ejection-fraction (67.7 +/- 6%) was normal in all cases. Postoperative first pass technique was employed using a fast multicrystal camera (Baird Atomic, system 77). Volumes were assessed measuring normalized total count rate (count integral of the left ventricle divided by the maximum count density). 19.8 +/- 11 months after valve replacement enddiastolic and endsystolic volumes revealed normal at rest (121.8 +/- 38 resp. 52.8 +/- 35 ml) and after maximum exercise (122.0 +/- 29 resp. 37.6 +/- 22 ml). Ejection fraction responded physiologically to exercise by rising from 57.7 +/- 12 to 69.7 +/- 10%.
D000328:Adult; D002908:Chronic Disease; D005260:Female; D005500:Follow-Up Studies; D006350:Heart Valve Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000000981:diagnostic imaging* / Q000503:physiopathology / Q000601:surgery; D011877:Radionuclide Imaging; D013670:Sodium Pertechnetate Tc 99m; D013318:Stroke Volume; D013667:Technetium
D013667:Technetium; D013670:Sodium Pertechnetate Tc 99m