Search PubMed⌕ Search

Biomedical subjects

A Senning

Publications and source records attributed to A Senning.

283 records · Page 16Linked to original sources
PubMedDate not supplied

Surgical therapy of internal carotid artery lesions of the skull base and temporal bone.

Five cases of carotid artery lesions at the skull base or temporal bone, treated surgically, are presented. These lesions include mycotic aneurysms and carotid stenosis secondary to angiofibroma and a glomus caroticum. One case demonstrated an anomalous carotid anatomic pattern with a persistent stapedial artery. A description is provided of the technique of subtotal petrosectomy with permanent anterior displacement of the facial nerve, and middle ear obliteration, thus achieving a safe exposure of the temporal course of the internal carotid artery. The cases indicate that cooperation between temporal bone surgeons and vascular surgeons is a prerequisite to successful repair of such lesions, as good recovery in all five cases was achieved. The techniques allow maintenance of carotid flow during and after repair, reducing the potential for neurologic complications or mortality.

Adolescent↗
PubMedDate not supplied

The late fate of autologous fascia lata valve grafts in the aortic position.

Fascia lata has been used for aortic valve replacement in 206 patients over a period of 10 years. Important advantages of this method are easy availability of the fascia tissue, excellent valve function in the early follow-up, and the absence of thromboembolic complications and of anticoagulant therapy. Long-term follow-up revealed a 10% incidence of infective endocarditis. Late deterioration of valve function occurred in 60% of patients after an average interval of five years. Electron microscopic study of fascia lata valve cusps removed one to seven years after implantation showed no endothelial layer, but an amorphous surface coating. The tissue remained viable, but showed necrotic foci and areas of proliferation. These morphologic alterations caused thickening and sclerosis of the valve cusps, which were responsible for the late deterioration of valvular function.

Aortic Valve↗
PubMedDate not supplied

Effects of left heart bypass on cardiac performance following myocardial ischemia.

A series of nine dogs underwent 20 minutes of myocardial ischemia by cross clamping the aorta while total cardiopulmonary bypass. The four dogs that did not have subsequent left bypass all showed a deterioration of ventricular function curve 30 minutes after restarting the heart beat when compared to their own preischemic values. The five animals which were supported for 30 minutes in left heart after bypass all showed essentially unchanged cardiac function after bypass. This study suggests that an improvement of myocardial performance after ischemic damage can be achieved with left heart bypass.

Animals↗
PubMedDate not supplied

The helix filter: a new vena caval filter for the prevention of pulmonary embolism.

The helix caval filter is a continuous band spiral composed of a highly elastic metal alloy. A vertical double-helix coil fixes the filter in the infrarenal vena cava by elastic expansion while a watch spring type horizontal coil works as the filtering element. The diameter of the filter can be reduced by torsion from 32 to 7 mm. Transvenous implantation was performed under fluoroscopy using a newly developed instrument featuring intraoperative angiographic control, high flexibility, a guidance system, and a well-controlled release mechanism. The filter and the implantation technique were tested in a circulation system and in 10 dogs and 4 calves (follow-up 3-91 days). In addition, two filters were released intentionally into the right atrium of a dog and a calf. Flow resistance of the filter is negligible up to more than 10 1/min. Thrombi larger than 3.5 mm were filtered out reliably. Lethal complications, filter migrations or perforations did not occur in animal experiments. Filter coils which are in contact with the vessel wall become firmly incorporated within 3 to 4 weeks. The patency rate of the vena cava was 80% (8/10) for dogs and 100% (4/4) for calves. Implantations in the right atrium did not cause any symptoms. The filter's design allows fixation without hooks or spikes and consequently makes transvenous extraction possible up to 7-10 days after implantation. Comparable clinical results could extend the indications for caval filter implantation, and the decision which is still difficult today could be made easier.

Animals↗
PubMedDate not supplied

Tetralogy of Fallot: to patch or not to patch?

Angiograms of 11 patients with Tetralogy of Fallot were reviewed before and after total repair, and analyzed with respect to growth of the pulmonary valve annulus. At the operation none of the patients was more than 5-years-old, none received a transannular patch and all were asymptomatic at the last visit. The radiologic diameter of the pulmonary valve annulus was compared to the descending thoracic aorta at the level of the diaphragm. Preoperative ratio averaged 1.09 +/- 0.22 and increased postoperatively to 1.35 +/- 0.20 (p less than 0.02). A "catch-up" growth of small annuli could be demonstrated.

Child, Preschool↗
PubMedDate not supplied

[Results and complications of bronchoplastic operations for bronchial cancer (author's transl)].

Among 1548 patients hospitalized from 1964 to 1975 for bronchial carcinoma, 779 underwent a brochopulmonary resection. Seventeen patients underwent bronchoplastic resections. The average hospital stay was 45 days which is explained by the frequency of postoperative complications (n = 8). The mortality during hospitalization was 11.5% and the 5 year survival rate was 18%. The survival curved was comparable to that of the patients who underwent a lobectomy or simple or enlarged radical pneumectomy. Actually, the average survival is 26 months and the comfort in these cases is impressive. We consider that the indication for these plastic resections should be extended to patients who are capable of tolerating a pneumectomy.

Adult↗