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Biomedical subjects

J Hammer

Publications and source records attributed to J Hammer.

At least 217 records · Page 12Linked to original sources
PubMed1976

Hospital mortality in patients with acute myocardial infarction: five-year experience.

Mortality during the hospitalization period was analyzed in a sample of 786 patients with acute myocardial infarction [AMI], admitted to the coronary care unit within a five-year period from a catchment area of 200 000 urban inhabitants. The total mortality during the hospitalization period amounted to 19.2%. The prognostic significance of certain clinically meaningful phenomena was appraised on the basis of their association to the mortality. It was demonstrated that the factors decisive for the prognosis of a patient with AMI are age, previous myocardial infarction, extent and localization of the ischaemic lesion apparent from the ECG tracing, and, in addition, presence of the atrioventricular and intraventricular conduction defects, especially if combined with anterior myocardial infarction. Patients with a high cumulation of these prognostic factors exhibited severe signs of mechanical heart failure, which is the mechanism of death in practically all of the deceased patients under the present possibilities of treatment.

Acute Disease↗
PubMedDate not supplied

Thrombolysis of prosthetic tricuspid valve thrombosis with human recombinant tissue plasminogen activator in an adolescent.

Prosthetic heart valve thrombosis is associated with a high mortality. Traditionally, thrombectomy or valve replacement is performed. Thrombolysis offers a promising alternative to surgery. Usually, streptokinase and urokinase are the preferred agents for thrombolysis; however, human recombinant tissue plasminogen activator (rt-PA) is increasingly used. Thrombosis of prosthetic valves in children and adolescents is rare and experience of thrombolysis for obstructed valves is limited. We report the successful lysis of a thrombosed prosthetic tricuspid valve in an adolescent using rt-PA. The outcome of our patient supports the assumption that rt-PA represents an adequate therapeutic option for thrombolysis of obstructed prosthetic heart valves in children and adolescents.

Adolescent↗
PubMedDate not supplied

Cultivation of recombinant baby hamster kidney cells in a fluidized bed bioreactor system with porous borosilicate glass.

Dense cell cultivation of the recombinant cell line BHK 21 pSVIL2 was performed in a fluidized bed bioreactor system containing porous borosilicate glass carriers. Experiments were carried out with different medium formulations for a period of 48 days. Due to an effective immobilization of the cells in the reactor, continuous operation was easy to perform. Maximal cell densities and product yields could be maintained, even when protein-free medium was perfused exceeding 2 reactor volumes per day. Final cell densities of magnitude 7.1 x 10(7) mL-1 intrasphere volume were reached, while the interleukin-2 production rate was 0.70 mg day-1. The cell specific productivity reached a value of 1.3 x 10(-10) mg day-1. The first results were presented with a cell line that grows under glutamine-free medium conditions. The use of a glutamine-free medium for the cultivation of the cells resulted in a drastic decrease in cell metabolism. Furthermore, the amino acids lysine and histidine were produced and secreted into the culture supernatant, although these metabolites normally are considered to be essential for animal cells grown in vitro. However, no lethal effect on the cells has been detected, and the total number of cells in the reactor remained constant. The metabolism of threonine has been detected to be directly dependent on the presence of glutamine. Cells grown in glutamine-free culture medium produced glycine yields 6 times higher than those grown in glutamine-containing medium. A bead-to-bead transfer of the cells has also been detected when the cells immobilized within the intrasphere volume of the borosilicate carriers reached the stationary phase.

Amino Acids↗
PubMedDate not supplied

Alveolar cell carcinoma.

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Adenocarcinoma, Bronchiolo-Alveolar↗