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Biomedical subjects

M A Ali Khan

Publications and source records attributed to M A Ali Khan.

17 recordsLinked to original sources
PubMed1998

Results of 546 Blalock-Taussig shunts performed in 478 patients.

Between 1983 and 1995, 546 Blalock-Taussig shunt procedures were performed in 472 patients: 128 (23.0%) were classical shunts, 90 of them on the same side as to the aortic arch, and 418 (77.0%) were modified shunts, 182 on the same side of the arch. At the time of surgery, 78 patients were aged below one week, 270 from one week to 12 months, and 198 patients were over one year of age. The mean pre-operative arterial saturation (71.7% +/- 16.5%) was significantly increased to 83% +/- 17.9% immediately after the procedure (p=0.017). The overall hospital mortality rate was 2.9% (16/546), with rates of 2.3% (3/128) for the classical, and 3.1% (13/418) for the modified shunts (p=not significant). The rate was significantly higher, however, for classical shunts when the pulmonary arterial diameter was less than 4 mm (15.4% versus zero; p=0.047), though this relationship was reversed for modified shunts (zero versus 3.6%; p=0.338). Early mortality was significantly influenced by the age at surgery, 5/78 (6.4%) in patients aged below 1 week, 3.7% between 1 week and 1 year, and 0.5% over 1 year (p=0.019). Early mortality was also significantly increased in patients weighing 3kg or less, 8/156 (5.1%), versus 3/303 (1.0%), p=0.037. Overall, 51 shunts failed (9.3%), 10 early and 41 late. Early failure was significantly increased in patients weighing 3kg or less, 8/156 (5.1%) versus 3/303 (1.0%), p=0.016. The overall early failure rate was 1.4% (3/215) when heparin was administered intra-operatively and for 48 hours postoperatively, in contrast to an early failure rate of 3.4% (7/203) when heparin was not used (p=0.294). Overall rates of failure during follow-up were 9.1% (17/188) in heparinized patients versus 13.6% (24/177), (p=0.173) in non-heparinized patients. Failure of classical shunts was 10.2% (13/128), compared with 6.7% (28/418) for modified shunts (p=0.195). Failure was more common overall if the pulmonary arterial diameter was less than 4 mm, 14.7% (9/61), as opposed to 8.7% (26/300) when the diameter was 4 mm or greater, (p=0.144). Administration of aspirin during follow-up after the modified shunt procedure reduced failure from 11% (18/163) to 6.7% (10/150), p=0.176. Classical or modified Blalock-Taussig shunts, either on the same side or opposite to the aortic arch, can be performed on patients of any age with minimum postoperative complications and low operative mortality. The use of intra- and post-operative heparin appears to reduce the overall rate of failure, and the administration of aspirin during follow-up appears to reduce failure of modified Blalock-Taussig shunts.

Anticoagulants↗
PubMed1992

Experience with 205 procedures of transcatheter closure of ductus arteriosus in 182 patients, with special reference to residual shunts and long-term follow-up.

Between December 1987 and September 1991, 205 nonsurgical procedures for closure of patent ductus arteriosus were attempted in 182 infants, children, and young adults with use of the Rashkind double-disc ductal occluding device. The patients' ages ranged from 8 months to 26 years (median 5 years) with 18 aged less than 2 years. Their weights ranged from 7.4 to 55 kg (median 16 kg); in patients aged less than 2 years the mean weight was 10.2 +/- 1.5 kg, and in those aged more than 2 years mean weight was 19.5 +/- 9.6 kg. Successful occluder device implantation was achieved in 174 patients (96%) at the initial attempt. Device embolization to a pulmonary artery occurred in six patients; two of these devices were retrieved by grabber catheter and four at operation, all without adverse sequelae; there were two other technical failures. Follow-up studies included two-dimensional Doppler echocardiography with color flow mapping. The 6-week follow-up study revealed a small residual shunt in 27% (46/169) of patients. At the 6-month follow-up study, 22% (37/167) of the patients had a small residual shunt; this prevalence was 17% (24/145) in ducts with a narrowest diameter of less than 6 mm, and 59% (13/22) in ducts greater than 6 mm. Immediately after implantation of the occluder device and throughout the follow-up period, the mean narrowest ductal diameter of ducts with residual shunts was significantly larger than that of ducts in which total occlusion was achieved (range of p < 0.01 to 0.001). The use of the 17 mm occluder device, however, was significantly associated with an increased prevalence of residual shunt only immediately after implantation (p < 0.01). Implantation of a second occluder device was attempted in 21 patients with residual patent ductus together with a continuous murmur at the 6-month follow-up; embolization of one device to a pulmonary artery occurred immediately but it was retrieved by grabber catheter and another device was successfully implanted 1 month later. All 21 patients were seen for 6-month follow-up study, when only one (5%) had a small residual shunt that was subsequently successfully closed by the insertion of a third occluder device. Thus, after successful implantation of one or more occluder devices, complete closure of the ductus was achieved in 90% of all patients seen to date for their 6-month follow-up study. One patient had limited hemolysis. The maximum follow-up period is 50 months. These results confirm the efficacy, with low morbidity and no mortality, of the use of the Rashkind occluder device for nonsurgical closure of patent ductus arteriosus, especially in those with smaller diameters.

Adolescent↗
PubMed1991

Blade atrial septostomy: experience with the first 50 procedures.

We have performed 50 blade and balloon atrial septostomies in 46 patients with diagnoses of transposition of the great arteries--32 patients; mitral atresia or stenosis--10 patients; total anomalous pulmonary venous drainage--2 patients; tricuspid atresia--1 patient; and pulmonary valve atresia with hypoplastic right ventricle--1 patient. The patients' age ranged from 1 day to 72 months (median = 8 months) and weights ranged from 2.7 to 14.5 kg. In patients with transposition the systemic saturation increased from an average of 62% to 74.6% (p less than 0.001) and the inter-atrial mean pressure gradient was reduced from 7.74 +/- 5.3 to 1.4 +/- 2.04 mm Hg. Patients with mitral atresia had no significant increase in systemic arterial saturation but a significant decrease in the mean inter-atrial gradient from 19.6 +/- 12.4 to 3.8 +/- 5.3 mm Hg. In three patients the blade septostomy was unsuccessful for technical reasons and the condition of the patient. Complications included one death due to atrial laceration, blood loss requiring transfusion in 5 patients, transient CVA in one patient, and failure of the blade to close in one patient. We have found the palliative use of the blade catheter in conjunction with balloon atrial septostomy to be an effective and safe procedure.

Cardiac Catheterization↗
PubMed1990

Results of repeat percutaneous balloon valvuloplasty for pulmonary valvar restenosis.

Follow-up cardiac catheterization studies were used to evaluate 105 patients who had undergone percutaneous balloon pulmonary valvuloplasty. Fifteen of those patients who had peak systolic pulmonary valve gradients greater than = 40 mm Hg at follow-up underwent repeat balloon valvuloplasty. For the initial balloon pulmonary valvuloplasty, the mean ratio of the balloon diameter to pulmonary valve annulus diameter was 0.98 +/- 0.2; at repeat valvuloplasty the mean was 1.19 +/- 0.12. The immediate post-repeat balloon valvuloplasty results showed a reduction in the peak systolic gradient from a mean of 70.2 +/- 17.8 to 29.1 +/- 19.0 mm Hg (p less than 0.001). This reduction in the gradient was maintained at a mean of 14.3 +/- 5.0 mm Hg in 8 of the 10 patients who underwent further follow-up studies. We conclude that successful repeat balloon pulmonary valvuloplasty with the use of larger sized balloons is feasible in patients who have restenosis after the initial percutaneous balloon valvuloplasty--including partial but not complete dysplasia of the pulmonary valve.

Blood Pressure↗
PubMed1989

Percutaneous catheter closure of the ductus arteriosus in children and young adults.

The double-disk occluding device suitable for use in infants and children with patent ductus arteriosus, developed by Rashkind and Mullins, has been available to this institution since December 1987 on an investigational basis. Results of 43 nonsurgical ductal closure attempts using this device in children and young adults between December 1987 and October 1988 are presented. Successful implantation was achieved in 42 patients (98%). In 25 patients a residual shunt was seen on angiography immediately after implantation. In 12 patients a residual ductal shunt was detected by Doppler 24 hours after implantation; 6-week follow-up studies showed a small residual shunt in only 3 patients. After a second occluder device was implanted in 2 of these patients, complete closure of the patient ductus arteriosus was achieved. In 1 patient, early in the series, the occluder device embolized to the left pulmonary artery, necessitating surgical removal at the time of ductus division. This event was the only serious complication; there were no deaths.

Adolescent↗
PubMed1989

Transseptal left heart catheterisation in infants, children, and young adults.

Over a 5 yr period, from October 1983 to September 1988, transseptal left heart catheterisation, using Mullins long-sheath technique, was performed in 217 infants, children, and young adults, with various forms of congenital or acquired heart disease. The mean age was 50 +/- 45 months, (range 1 mo to 21 yr). The procedure was successful in 215 (99%) patients. Pericardial puncture occurred in three patients (1.4%), though without tamponade or sequelae. There was no mortality or morbidity. Transseptal left heart catheterisation is a safe procedure for studying the left side of the heart. In addition, and of increasing importance, it allows the performance of interventional procedures on the left side of the heart and avoids the use of retrograde catheterisation through the femoral arteries.

Adolescent↗
PubMed1989

Critical pulmonary valve stenosis in patients less than 1 year of age: treatment with percutaneous gradational balloon pulmonary valvuloplasty.

A new technique of percutaneous gradational balloon pulmonary valvuloplasty was used successfully in 17 infants less than 1 year of age, including four neonates, with critical congenital pulmonary valve stenosis, who would otherwise have required surgical intervention. This technique uses a sequential series of balloon catheters of gradually increasing size as a means of eventually crossing the very small valve orifice with a balloon catheter of adequate size to achieve successful pulmonary valvuloplasty. The initial dilatations were achieved with balloon catheters 2, 3, or 4 mm in diameter. Immediately after successful balloon valvuloplasty, the mean pulmonary systolic pressure gradient was reduced from 105 +/- 11 to 20 +/- 5 mm Hg. Percutaneous balloon pulmonary valvuloplasty can be performed safely with good results despite critical congenital pulmonary valve obstruction in severely ill infants.

Catheterization↗
PubMed1988

Brucella infective endocarditis. Successful combined medical and surgical therapy.

Five cases of Brucella infective endocarditis are described involving a native aortic valve, two native mitral valves, a mitral valve bioprosthesis, and a ventricular septal defect patch. The diagnosis of Brucella infective endocarditis was established from the clinical features, with a high Brucella serologic titer in each case. Blood and tissue cultures were positive in four of five patients. Two-dimensional echocardiograms demonstrated moderately large vegetations on the three affected native valves and the patch and also revealed the development of vegetation on the mitral bioprosthesis as the disease progressed. All the patients were successfully treated by combined surgical and medical therapy, the latter consisting of co-trimoxazole, tetracycline, and streptomycin/gentamicin for 6 weeks; the affected valves and the ventricular septal defect patch were all replaced. There were no operative deaths and there has been no recurrence of infection to date. One patient died suddenly of an unknown cause 1 year after the operation.

Adult↗
PubMed1986

Percutaneous transluminal balloon pulmonary valvuloplasty for the relief of pulmonary valve stenosis with special reference to double-balloon technique.

PTBPV was performed 33 times in 32 patients in the Riyadh Armed Forces Hospital. Patients ranged in age from 6 months to 12 years (mean 4.5 years); average weight was 14.86 kg. Before dilatation, all patients had grade 4/6 late peaking systolic ejection murmurs, with right-axis deviation and right ventricular hypertrophy on ECG. Moderate to severe pulmonary valve stenosis (right ventricle-pulmonary artery gradient 50 mm Hg systolic) was confirmed both hemodynamically and angiographically. Balloon size was selected to be approximately 2 mm larger than the pulmonary valve anulus was over 25 were inflated to approximately 5 atmospheres of pressure. Two patients required two simultaneous balloons as the pulmonary valve anulus was over 25 mm. Predilatation peak systolic pressure gradients ranged from 50 to 245 mm Hg (mean 99.2 mm Hg); postdilatation gradients ranged from 8 to 93 mm Hg (mean 23.4 mm Hg). There were no deaths or complications. The systolic murmur with early systolic peak decreased in all but three patients. Systolic thrill disappeared in all but three patients. Follow-up at an average of 10 months revealed increasing exercise tolerance in two thirds of patients. Fourteen patients have been recatheterized at least 6 months after dilatation and showed persistent minimal gradient. We conclude that balloon valvuloplasty of pulmonary valve stenosis is an effective, safe procedure. At this writing, a total of 90 successful PTBPVs have been performed, with equally impressive results.

Angioplasty, Balloon↗
PubMed1986

Cystic lung disease in Down's syndrome: a report of two cases.

Previously unreported lung disease found at autopsy in 2 young infants with Down's syndrome and congenital heart disease (complete atrioventricular canal malformation with left-to-right shunt) is described. The perinatal and neonatal period was unremarkable, and there was no history of mechanical ventilation or administration of high concentration of oxygen for extended periods. In 1 of the cases respiratory symptoms and hyperinflation with focal cystic changes in the lung fields on chest X-ray were noted at 5-7 months of age. Pathologically there was cystic dilatation of alveoli with focal cuboidal metaplasia of alveolar epithelium and mild to moderate focal alveolar septal fibrosis. Wilson-Mikity syndrome, congenital pulmonary lymphagiectasia, bronchopulmonary dysplasia, and idiopathic interstitial fibrosis of lungs were ruled out on clinical and/or pathologic grounds. Factors such as compression of bronchi by enlarged pulmonary arteries or cardiac chambers, peribronchiolar accumulation of fluid, pulmonary hypoplasia occurring in Down's syndrome, and episodes of pulmonary arterial hypoperfusion associated with severe congenital heart disease may be related to the pathogenesis of the lesion.

Cysts↗
PubMed1981

Dislocation following total hip replacement.

An analysis of 142 dislocations from a multicentre study of 6774 total hip replacements is reported. The incidence of dislocation was 2.1 per cent. Patients with neuromuscular disorder, those in a confused mental state, and those undergoing revision operations are at special risk. The commonest surgical error, present in nearly half the patients, was placing the acetabular cup too vertically or too anteverted. A less common fault was placing the femoral component too anteverted. Neither the original pathology nor the approach to the hip appeared to affect the likelihood of dislocation. The dislocations were divided into early and late, single and recurrent, and the success rate of treatment is described in these groups. One hundred and eleven patients (78.2 per cent) eventually obtained stability. Of those with a single dislocation, 62 per cent remained stable after a single manipulation. Thirty-four per cent of the patients required an open operation to achieve stability and it is suggested that, in many cases, open reduction alone is not enough; the mechanical fault needs to be corrected.

Acetabulum↗
PubMed1978

Plating of fractures of the middle third of the clavicle.

Twenty mid-clavicular fractures are reported which required plate fixation. This technique gave relief from pain within 12 hours and resulted in bony union in every case. The indications for this operation are described.

Accidents, Home↗