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Biomedical subjects

J C Pollock

Publications and source records attributed to J C Pollock.

51 records · Page 3Linked to original sources
PubMed1986

False aneurysm formation: a complication following the modified Blalock-Taussig shunt.

False aneurysm formation is a rare complication of the modified Blalock-Taussig shunt. A patient is described in whom this complication arose 11 months after operation. Death resulted from rupture of the aneurysm into the right lung with associated massive hemoptysis. The onset of hemoptysis in patients with a functioning modified Blalock-Taussig shunt may be the first evidence of a developing false aneurysm.

Arteriovenous Malformations↗
PubMed1986

Permanent cardiac pacemaker in infants and children.

Between October 1970 and November 1984, 26 infants and children aged 11 days to 18 years (mean 5.7 years) received 42 permanent cardiac pacemakers (26 primary implants, 16 re-implants) for congenital or surgically acquired heart block, bradycardia and sinus node dysfunction. Twenty-two patients had unipolar pacing and 4 bipolar pacing. Of 26 primary implantations, 2 had fixed rate epicardial pacing, 16 ventricular demand pacing (13 epicardial, 3 endocardial), 3 epicardial VAT (P-synchronous) pacing and 5 DDD (universal) pacing (4 epicardial, one endocardial). Fourteen patients required a further 19 operations for change of generators (16), ventricular lead (1), generator site (1) and generator encasing (1). Thirty-day hospital mortality was 11.5% (3/26), of which one death was possibly related to pacing failure. Four patients died during the follow-up period (3 months to 10 years; mean 3.4 years). Sixteen of the 19 survivors achieved complete symptomatic relief, without any medical therapy. Our results indicate that modern cardiac pacemaker systems are safe and reliable, and are associated with major relief of symptoms in this age group.

Adolescent↗
PubMed1986

Repair of total anomalous pulmonary venous connection in adults.

Three cases are presented of adults who underwent successful surgical correction of total anomalous pulmonary venous connection of the supracardiac type. Adults rarely present with this unusual condition but our experience suggests that correction can be performed, using the same techniques that are used in children, with a low operative risk and achieving similar long-term results.

Adult↗
PubMed1985

Coronary artery--pulmonary artery fistula in tetralogy of Fallot with pulmonary atresia.

The treatment of a rarely described variant of tetralogy of Fallot with pulmonary atresia is reported. The case is unique because the patient remained relatively pink although the pulmonary blood flow came solely from a fistula between the left coronary artery and the main pulmonary artery. The diagnostic and surgical implications are discussed and the literature briefly reviewed. The diagnosis should be borne in mind in patients who have pulmonary atresia with ventricular septal defect and a continuous murmur.

Coronary Vessel Anomalies↗
PubMed1984

Mitral valve replacement in the first three months of life.

Two infants, aged 2 and 3 months, underwent mitral valve replacement with Björk-Shiley mechanical valves for severe congenital mitral regurgitation not amenable to valve repair. Both infants survived the operation and left hospital taking a low dose aspirin anticoagulant regimen. One child survived for three years without incident, but the other died at 11 months of pneumonia after valve replacement for tissue ingrowth and subsequent thrombosis.

Graft Occlusion, Vascular↗
PubMed1983

Flexible fiberoptic sigmoidoscopy--the Monroe Clinic experience. A prospective study of 5000 examinations.

Analysis of 5000 consecutive flexible fiberoptic sigmoidoscopies form the basis of this report. It is concluded that this method of examination of the distal large bowel is not only safe and comfortable for the patient but is a more appropriate examination than the rigid proctosigmoidoscopy because of the significant increase in pathologic material found. This examination has proven practical and acceptable in a multispecialty clinic setting and has completely replaced rigid proctosigmoidoscopy. Flexible sigmoidoscopy is now the standard "routine" examination of the rectum and distal colon. The rationale for this conclusion is presented in this timely report.

Adolescent↗
PubMed1981

Experience with aortic and mitral valve replacement in children.

Ninety-two children underwent aortic (AVR) or mitral valve replacement (MVR), or both, at the Hospital for Sick Children in Toronto from 1963 to February, 1980. No early or late deaths occurred in 39 children having AVR. However, in 50 children having MVR, the operative mortality was 32% and the actuarial survival rate 5 years after operation was only 50%. Major complications occurred with almost equal frequency in the two groups; 50% of children surviving AVR or MVR experienced major complications within 6 years of operation. Retrospective comparison of results with tissue and mechanical valves showed no clear advantage with either type of prosthesis. Outgrowth of a prosthetic valve was satisfactorily managed in children with AVR but presented a difficult problem in those with MVR, who required frequent reoperation to increase the prosthetic valve to adult size. Prosthetic valve replacement in children is a palliative procedure at best, and every effort should be made to preserve the natural valve by a more conservative repair technique.

Adolescent↗
PubMed1980

Intraaortic balloon pumping in children.

From June, 1977, to December, 1978, 14 children had intraaortic balloon support after open-heart operation. There were 6 long-term survivors. Four of 5 children more than 10 years old and 2 of 5 children between 5 and 10 years old survived. All 4 children less than 5 years old died. In the youngest group, it was difficult to use the balloon successfully because of their very low cardiac output coming off bypass and their greater aortic elasticity. The smallest sizes of balloon available were found to be too long, extending well below the diaphragm in younger patients. In 7 out of 10 patients 5 years old or more, augmentation was obtained.

Adolescent↗
PubMedDate not supplied

Surgical closure of persistent ductus arteriosus (PDA) in infants before 30 weeks gestation.

Between October 1981 and December 1983 21 premature infants of mean gestational age 27.5 weeks (range 26-29 weeks) underwent surgical closure of persistent ductus arteriosus. Mean birth weight was 1080 g. There was no operative mortality. One death in an infant with pseudomonas septicaemia occurred two days after surgery. Twenty infants had features of idiopathic respiratory distress syndrome (IRDS) and required assisted ventilation prior to operation. Six infants had associated bronchopulmonary dysplasia (BPD) and 11 had signs of congestive cardiac failure. All infants presented with clinical features suggesting the diagnosis of PDA and in 18 the left atrial/aortic ratio was increased (mean 1.9:1). In 18 infants a trial of Indomethacin therapy had failed. This experience supports the view that surgical closure of PDA in infants born before 30 weeks gestation can be accomplished safely. We believe that surgical treatment of PDA represents the optimal therapy in this high risk group of infants.

Bronchopulmonary Dysplasia↗