Chitra heart valve: results of a multicenter clinical study

BACKGROUND AND AIM OF THE STUDY

The Chitra tilting disc valve was developed in India to meet the need for a low-cost cardiac valve. The valve has an integrally machined cobalt-based alloy cage, an ultra-high molecular-weight polyethylene disc, and a polyester suture ring. An important feature of this valve is its soft closing sound, by virtue of a plastic occluder.

METHODS

Between December 1990 and January 1995, 306 patients underwent isolated aortic (AVR, n = 101) or mitral valve replacement (MVR, n = 205) at six institutions in India. The early mortality rate was 6.9% (seven after AVR; 14 after MVR). A total of 285 survivors was followed up until September 1998; total follow up was 1212 patient-years (pt-yr) (AVR, 445 pt-yr; MVR, 767 pt-yr).

RESULTS

There were 52 late deaths (4.3%/pt-yr; AVR 2.2%/pt-yr; MVR 5.5%/pt-yr). Thirty-five deaths were valve-related (23 were due to unknown causes). One AVR patient (0.2%/pt-yr) and 12 MVR patients (1.6%/pt-yr) developed valve thrombosis, and embolic episodes occurred in 25 patients (seven after AVR, 1.6%/pt-yr; 18 after MVR, 2.4%/pt-yr). Bleeding events and infectious endocarditis occurred infrequently (AVR 0.9 and 0.7%/pt-yr; MVR 0.4 and 0.5%/pt-yr, respectively). There was no incidence of paravalvular leak or structural dysfunction of the valve. Actuarial survival rates at seven years were 82.4+/-4.0% for AVR and 65.2+/-5.0% for MVR. During the same interval, thrombus-free and embolism-free survival after AVR and MVR occurred in 98.9+/-1.1% and 94.1+/-1.9%, and 92.3+/-2.8% and 82.1+/-5.7% of patients, respectively. Freedom from all valve-related mortality and morbidity at seven years was 81.5+/-4.1% after AVR, and 64.2+/-5.1% after MVR.

CONCLUSION

The Chitra valve appears to be safe and to have performance comparable with that of other currently used tilting disc valves. This valve costs substantially less than other valves, and is therefore within reach of a larger subset of Indian patients.

Shone's Anomaly - A Case Report

Shone's anomaly, a rare congenital cardiac malformation consists of multiple levels of left heart obstruction - supravalvar mitral ring, parachute mitral value, subaortic stenosis and coarctation of the aorta. Although they present with a wide spectrum of major anatomical and haemodynamic abnormalities, a satisfactory outcome is possible for most patients. The operative mortality and outcome is affected by the severity of mitral value disease and the need for multiple operative procedures. We report one such case with this anomaly who presented to us in the third decade. He underwent a two - stage procedure in a single sitting successfully.

Repair of iliac artery aneurysms by endoluminal grafting: the systematic approach of one institution

Isolated iliac artery aneurysms are rare lesions that are difficult to detect and treat. Prompt diagnosis and timely intervention are essential, because the incidence of rupture is as high as 50%. The reported mortality rate for patients who undergo surgery for ruptured iliac artery aneurysm ranges from 50% to 70%. The recommended therapy remains surgical excision, although percutaneous techniques are effective alternatives in selected cases. Early intervention, carried out in a systematic fashion, can reduce the high morbidity and mortality. We report 4 cases of isolated iliac artery aneurysms managed over a period of 8 years by means of endoluminal grafting, with only 1 death. In our experience, prompt diagnosis by use of less invasive methods, such as duplex Doppler imaging, and timely intervention led to a reduction in the overall mortality.

Urinary IgG antibody capture particles adherence test for detecting HIV antibodies: a preliminary report

It is known that antibodies to HIV are secreted in urine and saliva. IgG antibody capture particle adherence test (GACPAT) has been shown to provide accurate results for antibodies in urine. The aim of the study was to study the sensitivity and specificity of this test in our settings. 114 urine samples were collected from both HIV positive and HIV negative patients and were analysed using GACPAT. The test has a sensitivity of 92.3% and specificity of 100%. We feel that this test has a definite role in our country especially for surveillance purposes.