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Biomedical subjects

S Høyer

Publications and source records attributed to S Høyer.

11 recordsLinked to original sources
PubMed1996

Serum aminoterminal propeptide of type III procollagen after cardiac transplantation and the effect of rejection.

The present study examines serum concentrations of the aminoterminal propeptide of type III procollagen (S-PIIINP), a marker of type III collagen synthesis, after heart transplantation, and assesses changes induced by rejection. Fourteen transplant patients were included with 12 coronary artery bypass patients serving as controls. Mild to moderate rejection was found in 44 biopsies, and severe rejection in 6. Two severe rejection incidents occurred before postoperative day 10, the remainder at postoperative days 23 to 57. S-PIIINP was elevated in transplant patients at postoperative days 1 to 7 (p < or = 0.01), with return to baseline at postoperative day 60 (p = 0.14, n = 6). S-PIIINP remained unchanged after mild to moderate rejection, but increased 1 to 2 weeks following severe rejection occurring after postoperative day 10. S-PIIINP was elevated in bypass patients from postoperative day 2 throughout the study period of 360 days (p < or = 0.01). Thus, type III collagen turnover after heart transplant and coronary artery bypass grafting resembles wound healing. Collagen synthesis after severe rejection is reflected by S-PIIINP approximately 2 weeks after transplant. The findings may prove to be significant concerning the prognosis of heart transplant patients.

Adult↗
PubMed1994

Tumor necrosis factor-alpha increases myocardial microvascular transport in vivo.

Tumor necrosis factor-alpha (TNF-alpha) is a primary mediator in the pathogenesis of tissue injury, and high circulating levels of TNF-alpha are found in a variety of pathological conditions. In open-chest anesthetized dogs, the effects of intracoronary recombinant human TNF-alpha (rTNF-alpha; 100 ng/kg for 60 min) on myocardial microvascular transport of a small hydrophilic indicator was examined by the single-injection, residue-detection method. Intracoronary infusion of rTNF-alpha increased myocardial microvascular transport after 120 min. This increase was preceded by a sustained decline in cardiac output and was associated with the appearance of areas with myocardial necrosis in the regional left ventricular wall. The myocardial plasma flow rate and maximum plasma flow rate in response to a 30-s coronary occlusion were not influenced by rTNF-alpha, although a decrease in the myocardial plasma flow rate was observed after 180 min. Circulating neutrophil counts were increased by rTNF-alpha, but the increase in myocardial capillary permeability could not be ascribed to regional neutrophil infiltration. We conclude that picomolar levels of rTNF-alpha can influence the movement of small hydrophilic molecules across the myocardial microvascular barrier in vivo and induce a prolonged decrease in cardiac performance. These effects may be important elements in myocardial pathophysiology.

Animals↗
PubMed1993

[Danish experience with physical and occupational rehabilitation after heart transplantation. The heart transplantation group at Rigshospitalet].

Heart transplantations have been carried out for one year (1.9.1990-1.9.1991) in Denmark. Twenty-three out of 27 patients survived at the end of this period. Prior to transplantation, all of the patients were in NYHA groups III or IV. On discharge, all of the patients could manage a 45-60 minutes training programme followed by a stair test (two to six floors up). Prior to transplantation, 17 patients received financial aid in one form or another and one child received special schooling. On an average 165 days (1.9.1991) after transplantation, nine patients were in full or part-time employment, two were students, seven received financial aid and five were still in hospital. A correlation between the duration of financial aid before transplantation and return to work after transplantation was found. In addition, age was found to be of significance. It is concluded that physical status and return to work are satisfactory.

Adolescent↗
PubMed1993

Genotypic and serotypic profile in dilated cardiomyopathy.

Eighteen consecutive patients, admitted with a diagnosis of dilated cardiomyopathy (DCM), to the Cardiology Section, Department of Internal Medicine, University Hospital, Uppsala, Sweden were enrolled into the study. All patients suffered signs of cardiac incompensation of variable duration. Patients were defined by conventional clinical investigations including chest X-ray, ultrasound, g-camera, catheterization and endomyocardial biopsy with histological evaluation by a specially trained pathologist. Angiography was performed to exclude ischemic heart disease. Several patients were diagnosed as having a specific reason for the cardiac insufficiency, like pheochromocytoma, SLE, ethylism, ischemic heart disease and hypertrophic cardiomyopathy. In this group all 7/7 had negative serology against Coxsackie B viruses. In the other group of idiopathic CM, no other etiology could be found. Serological analysis in this group showed high IgM titres against Coxsackie viruses in 6/8 patients. EDTA-blood was taken for tissue-typing using DNA probe hybridisation. 6/12 patients had DQB1:4 using the newest nomenclature, vs 17% in the control population. The reversed picture was observed for DQB1:2, occurring in 1/12 patients, vs 19% in the normal population, thus indicating a protective value of this genotype, which to our knowledge has not been described before. The results indicate a dual dependence of (host) genotype and (virus) serotype according to the Doherty-Zinkernagel hypothesis. Thus, it would also be in agreement with the virus-immune hypothesis suggested more than 20 years ago to explain the enigmatic pathogenesis of DCM.

Adult↗
PubMed1992

[Captopril-induced toxic hepatitis].

Captopril, the competitive inhibitor of angiotensin-converting enzyme, has proved efficient in the treatment of arterial hypertension and heart failure. Its use is generally associated with low incidence of adverse reactions and hepatic injury has not been emphasized as an important adverse reaction in Denmark. However worldwide, several cases of hepatic injury have been reported. We report one case of Captopril-induced hepatic injury. Despite discontinuation of Captopril a hepatorenal syndrome developed and the patient died five weeks after admission. This report emphasizes the need to be aware of the possibility of hepatic injury in patients receiving Captopril.

Aged↗
PubMed1992

A rat model of reproducible cerebral infarction using thrombotic blood clot emboli.

The purpose of this study was the development of a model of embolic stroke with high reproducibility concerning infarct volume. In 37 male Sprague-Dawley rats, the internal carotid artery was embolized with in vitro preformed suspensions of autologous microemboli resembling arterial thrombi. With a method of continuous flow through the carotid arterial catheter, reflux of blood with uncontrolled clotting and embolization was avoided, thereby providing control animals free of ischemic damage. The embolized animals had arterial occlusions on angiograms immediately after embolization and no spontaneous recanalization on angiograms 2 h later. The cerebral blood flow measured by the intra-arterial 133Xe injection method decreased to 21-37% of baseline values. All embolized animals developed hemiparesis with spontaneous circling behavior, embolization with more than 150 microliters clot suspension resulted in hemispherical infarcts. There was a strong statistically significant correlation between amount of emboli, rate of vascular occlusion, and volume of infarcted tissue. This is the first model presented utilizing autologous in vitro microemboli imitating "white" arterial thrombi. The animals developed infarction, resembling human stroke.

Angiography↗
PubMed1991

[Heart transplantation in Denmark. Therapeutic routines and preliminary results].

When the criterion of brain-death was introduced in Denmark on 1.7.1990, the possibility for heart transplantation and other interventions was opened. The first heart transplantation was carried out 3.10.1990 and, during the first year, 28 transplantations were carried out on 27 patients. The therapeutic routines in the department are reviewed and the results obtained after the first year are presented. A total of 33 donors who fulfilled the donor criteria were available. Of these, 28 came to Rigshospitalet, two were sent abroad and suitable recipients could not be found for two. The recipient group consisted of four women and 23 men with an average of 46 years. At the time of writing, on an average 169 days after operation (13-330), 23 out of 27 patients survived in good health and with normal cardiac function. Three patients are still in hospital.

Adult↗