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Biomedical subjects

J D Keith

Publications and source records attributed to J D Keith.

At least 19 recordsLinked to original sources
PubMed1999

Implant support for removable partial overdentures: a case report.

Functional stability and the preservation of remaining alveolar bone are primary, and often elusive, goals when restoring the partially edentulous arch. The incorporation of dental implants for the partial support of removable prostheses offers a practical adjunct in the fulfillment of these objectives. Planning for complex courses of treatment that include dental implants requires close coordination between the surgeon and the restorative dentist. Decisions that deal with type, location, size, number of implant fixtures, and design of the prosthesis are critical. All of these areas must be discussed and established as acceptable to the patient and each clinician before the initiation of treatment. In this report, we present a course of patient treatment in which a removable partial denture is supported by natural remaining teeth in conjunction with osseointegrated implants.

Adult↗
PubMed1976

Truncus arteriosus communis. Clinical, angiocardiographic, and pathologic findings in 100 patients.

Salient clinical, hemodynamic, angiocardiographic, and pathologic findings are presented in 100 patients with truncus arteriosus communis, 79 of whom were studied at autopsy. In this study of typical truncus, all had a ventricular septal defect (type A). Truncus with a partially formed aorticopulmonary septum (type A1) was much the commonest form (50%). Cases with no remnant of aorticopulmonary septum (type A2) were second in frequency (21%). The distinction between types A1 and A2 could not be made with certainty in 9%, because these types merge into one another. Cases with absence of either pulmonary artery branch (type A3) were the least frequent form (8%). Truncus with interruption, atresia, preductal coarctation, or severe hypoplasia of the aortic arch (type A4) constituted 12%. The diagnosis of truncus is primarily angiocardiographic. The plane of the truncal valve in the lateral projection is distinctive. It tilts anteriorly, facing the patient's toes, which can be of assistance in differential diagnosis. The angiocardiographic features of type A4, although unfamiliar, are pathognomonic. Since the median age at death was only 5 weeks, and in view of the difficulties associated with pulmonary artery banding, our goal should be the surgical correction of truncus during the first and second months of life.

Adolescent↗
PubMed1975

Double outlet right ventricle (S,D,L) with subaortic ventricular septal defect and pulmonary stenosis. Report of six cases.

The clinical, hemodynamic, angiocardiographic and pathologic findings are presented in an infrequent but surgically correctable type of double outlet right ventricle. This study is based on six cases, one with autopsy confirmation. In all, the viscera and atria were in situs solitus (S). A ventricular d-loop was present (D). There was I-malposition of the great arteries, the aorta being to the left of, and anterior to, the pulmonary artery (L). Hence, this anomaly may conveniently be represented as double outlet right ventricle (S,D,L,). The ventricular septal defect to the ventricular septum. A bilateral conus was present beneath both the aortic and pulmonary valves, preventing any semilunar-atrioventricular fibrous continuity. The subpulmonary conus was poorly expanded, resulting in pulmonary infundibular and valvular (annular) stenosis. The clinical features were those of cyanosis, clubbing and accentuation of the second heart sound in the pulmonary area (related to aortic valve closure). There was a systolic ejection murmur along the upper left sternal border, related to pulmonary outflow tract stenosis. Selective right and left ventricular angiocardiography was diagnostic. Relatively early surgical correction is suggested to minimize the progression of pulmonary infundibular stenosis and to avoid acquired atresia. In this malformation, pulmonary outflow tract reconstruction is more difficult than in tetralogy of Fallot because of the rather posterior location of the pulmonary outflow tract, and because the right coronary artery crosses the stenotic pulmonary outflow tract in front of the pulmonary valve.

Angiocardiography↗
PubMed1972

Computer-based data storage and retrieval in pediatric cardiology.

The use of computer technology is becoming increasingly important in the handling of medical records. The cardiology data system used at The Hospital for Sick Children has greatly simplified the review and analysis of patient records. The methods of capturing data are logical and straightforward and have assisted fellows, residents and students in learning the systematic approach to the diagnosis of heart disease in children. The review of particular defects conducted as a research project has often led to further studies which have made important contributions to the knowledge of heart disease in childhood.

Computers↗
PubMed1970

Natural history of isolated patent ductus arteriosus and the effect of surgical correction: twenty years' experience at The Hospital for Sick Children, Toronto.

Seven hundred and forty-four cases of patent ductus arteriosus were diagnosed at The Hospital for Sick Children, Toronto, in the 20-year period from 1947 to 1966. Of these 705 have been treated surgically. It is concluded that operation is best performed between 6 and 12 months of age. Isolated ductus arteriosus is rarely a cause of congestive heart failure, and is more likely to be so in the presence of the rubella syndrome. Failure associated with the anomaly in the neonatal period can usually be successfully managed by medical treatment. Spontaneous closure after one month of age is not to be expected. Surgical treatment at the appropriate time prevents the subsequent development of Eisenmenger's complex.

Adolescent↗