Search PubMed⌕ Search

Biomedical subjects

H G Borst

Publications and source records attributed to H G Borst.

At least 235 records · Page 13Linked to original sources
PubMed1977

[Implantation of the intraaortic balloon catheter through the aorta ascendens (author's transl)].

In intraoperative cardiac low out-put syndrome balloon implantation through the ascending aorta can be accomplished for secure and rapid installation of IABP, if sternotomy has occurred and successful insertion through the common femoral artery has proven to be impossible. The disadvantage of rethoracotomy for explantation of the balloon catheter can be accepted without additional risk.

Aorta, Abdominal↗
PubMed1977

[Intramyocardial calcification of unknown origin (author's transl)].

A case of intramyocardial calcification is presented. The etiology can neither be explained by history, nor by clinical or histological examination. The diagnosis was made by cardiac catheterization and angiocardiography. This showed that the calcification had occurred mostly in the myocardium of the left ventricle and interventricular septum. Because of chronic heart failure surgery was indicated and large amounts of the calcified mass were removed by means of an open heart operation. One and a half years later the patient is much improved though clinical signs of heart failure persist. Possible causes of myocardial calcification are discussed and the problems of surgical intervention outlined.

Adult↗
PubMed1977

[Intracardiac correction of congenital heart anomalies in 104 infants (author's transl)].

From 1974 to 1976 104 infants (under 1 year of age) underwent intracardiac correction for congenital heart diseases. Mean age and body weight were 6.6 +/- 3.6 months resp. 5.66 +/- 1.4 kgs. The diagnoses and mortality rates were: transposition of the great arteries (TGA) with intact ventricular septum 27 (0), TGA plus associated anomalies 9 (0), ventricular septal defect (VSD) 20 (1), VSD plus associated anomalies 6 (1), total anomalous pulmonary venous drainage 9 (5), pulmonary stenosis and pulmonary atresia with intact ventricular septum 9 (2), aortic stenosis 7 (3), ASD I or II 7 (0), and miscellaneous 10 (3). Intracardiac correction was performed either on cardiopulmonary bypass and moderate hypothermia or in deep hypothermia with or without total circulatory arrest. The early mortality in the first group was 7% (6 out of 90), in the second group 64% (9 out of 14). With increasing experience, cardiopulmonary bypass has proven to be a save method for intracardiac correction of congenital heart anomalies in infancy even in the youngest age group under three months of age and under emergency conditions.

Age Factors↗
PubMed1977

[The department system in surgery (author's transl)].

The organisational model practised at the Department of Surgery at Hannover Medical School during the last 8 years has proven practicable, efficient and largely satisfactory to all of the staff. It is derived from Anglo-Saxon prototypes, differing from these, however, in a considerable participation of the residents in questions essential to their progress. The modalities of cooperation within the Department are presented in detail and ways and modalities for avoiding intra- and extradepartmental friction are discussed.

Emergencies↗
PubMed1977

[Dysphagia as a symptom of idiopathic fibrous mediastinitis].

A case of idiopathic chronic fibrous mediastinitis accompanied only by dysphagia is reported. Symptoms, etiology, and differential diagnosis are discussed with reference to the literature reviewed. The various conservative and operative methods of treatment are presented. In this case, attempts to mobilize the oesophagus were unsuccessful. Therefore, the oesophagus was bypassed via the colon.

Adult↗
PubMed1976

In vivo evaluation of the Lillehei-Kaster heart valve prosthesis.

In vivo evaluation of the Lillehei-Kaster heart valve prosthesis was performed in 28 patients; 22 had undergone aortic valve replacement and 6 had had mitral valve replacement. Mean pressure gradients ranged from 6 to 53 mm Hg in aortic prostheses; valve area varied from 0.83 to 2.9 cm2. The maximum opening angle of 80 degrees was never reached in this group of patients; opening angles ranged from 57 to 74 degrees without evidence of disc malfunction. There was no correlation between the ratio of effective to geometric valve area and the degree of opening of the disc occluder. Similar results were found in the mitral valve group. Gradients ranged from 6.0 to 12.5 mm Hg and valve area from 1.6 to 2.2 cm2. The maximum opening angle was 59 to 63 degrees. It is concluded that incomplete opening of the disc occluder in pivoting-disc valves is not necessarily a sign of disc malfunction. Lillehei-Kaster valves smaller than 18 mm in internal diameter should be avoided in adults, and outflow aortoplasty for implantation of a larger prosthesis should be used in patients who have a narrow aortic root.

Adult↗
PubMed1976

[Congenital aneurysms of the membranous ventricular septum (author's transl)].

In 3 patients with a congenital aneurysm of the membranous portion of the ventricular septum diagnosis could be made by angiography. One of these patients was clinically asymptomatic, while the two other patients were transferred for surgery because of right ventricular outflow tract obstruction or intracardiac left-to-right shunt. These both patients underwent successful open heart corrections. Aneurysms with a different intracardiac localization could be found. One of the cases represents an unusual association with corrected transposition of the great vessels.

Adolescent↗
PubMed1976

[Cineradiographical studies of local ventricular motility before and after aorto-coronary bypass (author's transl)].

The purpose of this study was to observe the effect of surgical revascularization on the motility of the left ventricular segment distal to a high grade coronary stenosis. In 17 patients with LAD bypass local relative segment shortening lambda (lambda = diastolic length - systolic length/diastolic length X 100) was determined measuring the distances of coronary bifurcations and surgically implanted myocardial metal markers frame by frame in high speed cineradiography. A group of 14 patients whose angina pectoris was abolished after operation and where bypass proved to be patent showed significant increase of lambda within the first postoperative days (lambda preop. = 3,4 +/- 18,3 SD, lambda postop. = 18,9 +/- 8,0 SD, p less than 0.05). Paradoxical movement had disappeared in 4 cases. In the following two-monthly controls up to one year no significant further alterations of local motility were seen. Three patients with persisting angina did not show any increase of segment shortening. It is concluded that aorto-coronary bypass surgery can restore impaired local motility in the majority of patients. The method described is useful for repeated non-invasive controls of the success of operation.

Angina Pectoris↗
PubMed1976

[Performance of the Lillehei-Kaster-prosthesis. A critical haemodynamic study (author's transl)].

11 patients were studied 6 to 12 months after aortic valve replacement with Lillehei-Kaster-prosthesis (LKP). We found pressure gradients (deltaP) at rest of 31 mmHg (7 to 52 mmHg), 37 mmHg (8 to 69 mmHg during exercise and 8 mmHg during ventricular pacing delta P was influenced by stroke volume and valve size, but not by the width of the aorta. The opening angle alpha of the disc was only 62degrees and depended on stroke volume and on the orientation of the value within the aorta. The blood passed the valve ring only through the larger part of the orifice, the opening area was only 50% of the given area. Thus in practice the LKP does not perform to manufacturers specification.

Aortic Valve↗
PubMed1976

[The Lillehei-Kaster valve prosthesis hemodynamic and mechanic features in vivo (author's transl)].

29 patients with Lillehei-Kaster vale prostheses, 22 in aortic position and 7 in mitral position, were examined. With small aortic valves (A 14 - A 16) mean gradients averaged 32 mm Hg, valve area varied between 1 and 1.2 cm2. Only size A 20 and larger showed satisfying gradient and valve areas of 1.9 cm2 and greater. The mitral gradients averaged between 10 and 5 mm Hg according to size and valve areas were about 1.6 cm2. The maximal measured opening angle of the pivoting disk averaged 64degrees in the aortic valves and 61degrees in the mitral valves; complete opening (80degrees) was not observed.

Aortic Valve↗
PubMed1976

[Clinical and hemodynamic evaluation on the functional performance of the Starr-Edwards low profile valve prosthese in mitral position (author's transl)].

205 patients with isolated mitral valve replacement using the Starr-Edwards low profile valve prostheses (model 6520 and 6550) were followed 3 to 67 months (mean of 30,4 months) after surgery. While these prostheses seems to reliable substitutes with regard to functional performance and to mechanical dysfunction, postoperative hemodynamic investigation revealed significant diastolic pressure gradients across the valve as well as reduction in functional mitral valve area relative to pulse and stroke volume. The incidence of thromboembolism was comparable to other artificial valves.

Blood Pressure↗