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Biomedical subjects

K Zeman

Publications and source records attributed to K Zeman.

At least 19 recordsLinked to original sources
PubMed1992

Amlodipine in patients with stable angina pectoris treated with nitrates and beta-blockers. The influence on exercise tolerance, systolic and diastolic functions of the left ventricle.

The effects of 5 and 10 mg of amlodipine and of placebo were compared in 21 patients with stable angina pectoris and multivessel coronary artery disease. The blind comparison was performed by means of bicycle ergometry and stress echocardiography using esophageal stimulation of the left heart atrium. All patients subsequently received placebo, amlodipine 5 mg and 10 mg for 2 weeks. In bicycle ergometry both doses of amlodipine in comparison with placebo significantly lowered the ST segment depression in lead V5 and prolonged the time to onset of angina. The exercise duration was significantly prolonged only after 10 mg of amlodipine. In stress echocardiography 10 mg of amlodipine significantly improved ejection fraction and reduced wall motion score during stimulation and increased peak velocity of relaxation of left ventricular posterior wall at rest and immediately after stimulation. In the patients with left ventricular end-diastolic pressure < or = 20 mmHg, amlodipine reduced the ratio of peak transmitral flow velocity in atrial contraction to that in early diastole (A/E) at rest and shortened deceleration time at rest and immediately after stimulation. Amlodipine in patients with stable angina pectoris significantly improved the exercise tolerance and the function of the left ventricle in a dose-dependent way. Amlodipine was well tolerated.

Amlodipine↗
PubMed1992

Effects of nifedipine and diltiazem on myocardial ischemia in patients with severe stable angina pectoris treated with nitrates and beta-blockers.

In a randomized, cross-over, double-blind study, the effects of nifedipine were compared with those of diltiazem in 20 patients with severe stable angina pectoris and multivessel coronary artery disease treated with nitrates and beta-blockers. The comparison was performed by bicycle ergometry, clinical evaluation, and ambulatory 24-h ECG monitoring for 7-8 weeks. As compared with placebo, both nifedipine and diltiazem significantly reduced the daily number of anginal attacks and nitroglycerin consumption; prolonged exercise duration, time to 1-mm ST segment depression, and to onset of angina; and reduced the sum of ST segment depressions at maximal identical load in ergometry. In ambulatory ECG monitoring, only nifedipine significantly diminished the duration of asymptomatic ST segment depression as compared with placebo. Antianginal and antiischemic effects of nifedipine and diltiazem were similar. Both nifedipine and diltiazem significantly increased the effects of treatment with nitrates and beta-blockers. Administration of nifedipine was safer because at night diltiazem caused significant bradycardia despite careful titration of optimum doses of the drug. Although the maximum well-tolerated doses of conventional medication suppressed anginal symptoms in some patients, they did not abolish ischemia either at ergometry or in daily life.

Adrenergic beta-Antagonists↗
PubMed1992

The effect of thymic hormones (TFX) on lymphocyte subpopulations and proliferation after maximal physical effort.

The studies were performed on healthy well-trained cyclists. Maximal physical exercise was performed on a Monark bicycle ergometer according to individual schemes. Heart rate amounting to about 200 bts/min and oxygen consumption stabilization were considered as criteria for maximal physical exercise. In this study we have investigated the effect of short-term stimulation of conditioned sportsmen with thymic hormones and evaluated T cell subsets, DR antigen and transferrin receptor expression as well as mitogen-induced proliferation of lymphocytes before and after maximal physical effort. The results suggest that intensive physical exercise may be responsible for transient decrease of CD4/CD8 ratio and mitogen responsiveness, and increase of mononuclear cells number bearing HLA DR+ and CD71 antigens. These changes were modified by the treatment with thymic hormones.

Adult↗
PubMed1992

[Certain factors of cellular immunity in clinical evaluation of women with EPH gestosis symptoms].

The applicability of clinical examination was studied in women with symptoms of medium-advanced or advanced primary gestosis of subpopulation of T lymphocytes (CD3+, CD4+, CD8+) in the peripheral blood. Also studied was the usefulness of the proliferative activity of lymphocytes in in vitro cultures: spontaneous and mitogenic (PHA, ConA, PWM)--in the environment of fetal calf serum (FCS) and autologous sera: heat-inactivated and heat-non-inactivated. It has observed that the percentages of particular T Lymphocyte subpopulations and the proportion of CD4+ lymphocytes to CD8+ lymphocytes in the peripheral blood and the mitogenic activity of the heat-non in activated autologous serum in the test of lymphocyte spontaneous blastic transformation reveal a correlation with an enhancement of particular clinical symptoms of EPH gestosis and with the birth condition of newborns.

Adult↗
PubMed1992

[Spontaneous proliferative activity of lymphocytes in normal and EPH gestosis complicated pregnancy].

The spontaneous proliferative activity of lymphocytes and CD4+/CD8+ ratio has been estimated in normal and EPH gestosis-affected pregnancy; also the effects of autologous and allogenic sera on this lymphocyte activity was evaluated. Although in normal pregnancy there was a very low CD4+/CD8+ ratio, the spontaneous proliferative activity of lymphocytes and the effects of autologous sera exerted thereupon were the same in either healthy pregnant women or in non-pregnant controls, what indicates a normal cellular immunity in physiological pregnancy. In gestosis an increased proliferative activity of lymphocytes and very high CD4+/CD8+ ratio was observed, when referred to non-pregnant controls. The serum of normal pregnant women did not reveal any immunosuppressive features against the activity of both autologous lymphocytes and gestosis--affected pregnancy, whereas it clearly inhibited the lymphocyte proliferation in non-pregnant controls. A different model of the autologous sera effects on the lymphocyte activity in gestosis women--when compared with the other examined women--is an evidence for altered immuno-modulating parameters of the serum in question.

CD4-CD8 Ratio↗
PubMed1992

[Subpopulations of t lymphocytes and lymphocyte proliferative activity in normal pregnancy].

T lymphocyte subpopulations (CD3+, CD4+, CD8+) and the lymphocyte proliferative responses to mitogens (PHA, Con A, PWM), in the environment of fetal calf serum (FCS) were examined in 16 normal primigravidas in the third trimester of pregnancy and in 15 healthy nonpregnant women. In normal pregnant women significantly lower absolute and percentage numbers of CD3+ and CD4+ T cells and almost twice reduced CD4+/CD8+ ratio were found, in comparison with nonpregnant subjects. Despite the shifts among particular T lymphocyte subsets in the peripheral blood, non disorders were found in the lymphocyte proliferative responses to mitogens in normal pregnancy.

Adult↗
PubMed1992

[Immunomodulating properties of sera in normal pregnant women].

The purpose of this study was to analyze the immunosuppressive properties of sera of normal pregnant women. Effects of pregnancy sera on the proliferation of mitogen (PHA, Con A, PWM)-induced lymphocytes were examined in healthy primiparas. The sera of normal pregnant women inhibited the proliferation of PHA- and Con A- induced both autologous and allogenic lymphocytes (obtained from nonpregnant and pre-eclamptic women), while remaining neutral towards the proliferation of PWM- induced lymphocytes in comparison with fetal calf serum. The basic immunomodulatory activity of the sera in pregnant women was contained in the heat-stable fraction.

Adult↗
PubMed1992

Effect of neutrophils on the growth of human pre-S1-reactive T-cells in vitro.

Granulocyte factor (GF) derives from the specific granules of polymorphonuclear neutrophils. GF possesses an immunoregulatory activity and augments the immune response to antigens in vitro and in vivo. The Pre-S1 sensitive T-cells reactive to Pre-S1 protein in vitro were developed from peripheral blood mononuclear cells of hepatitis B convalescent by in vitro Pre-S1 protein stimulation. The GF involvement in the activation and development of the Pre-S1 specific regulatory T-cells in vitro was studied.

Adjuvants, Immunologic↗
PubMed1992

[Ebstein's anomaly (a group of 47 patients)].

In a group of 47 patients with Ebstein's anomaly followed up on a long-term basis the authors describe the natural course of the disease as well as contemporary diagnostic and therapeutic possibilities. The authors draw attention to typical symptoms of Ebstein's anomaly and emphasize the importance of early diagnosis by two-dimensional echocardiographic and Doppler examination and the introduction of individual conservative or surgical treatment.

Adolescent↗
PubMed1991

Hemodynamic effects of transdermal nitroglycerin patches in patients with acute myocardial infarction.

Transdermal nitroglycerin patches are used mainly in the therapy of angina pectoris. However, the magnitude and duration of their effects are still controversial. In this study, transdermal discs with nitroglycerin were given to 14 patients with acute myocardial infarction (AMI) and mild hemodynamic impairment. Seven patients received Nitroderm TTS, and seven patients Deponit 5 (in this case 2 patches), the nitroglycerin dose being 10 mg. Hemodynamic measurements were made 19-24 h after application of the patch and 1 h after its removal. Comparing with the values obtained 1 h after removal of the patch, 19-24 h after the application of the patch heart rate was significantly higher (90.2 +/- 3.8 vs. 85.6 +/- 4.0 min-1; p less than 0.01), mean right atrial pressure was significantly lower (10.8 +/- 1.0 vs. 12.7 +/- 1.3 mm Hg; p less than 0.01), and so were the pulmonary artery pressure: systolic (36.9 +/- 3.0 vs. 43.0 +/- 3.1 mm Hg; p less than 0.001), mean (26.8 +/- 2.1 vs. 31.4 +/- 2.0 mm Hg; p less than 0.001) and the capillary wedge pressure (19.2 +/- 1.8 vs. 23.0 +/- 1.9 mm Hg; p less than 0.01). These findings revealed that in patients with AMI hemodynamic effects persist for at least 19 h after single application of a nitroglycerin patch of 10 mg. The therapy is safe and the risk of side effects is small.

Administration, Cutaneous↗
PubMed1991

Effect of thymic extract on allogeneic MLR and mitogen-induced responses in patients with chronic active hepatitis B.

Cell-mediated immune reactions are involved in the development of chronic active hepatitis (CAH-B). The present studies confirm that lymphocyte from patients with CAH-B have a decreased allogeneic mixed lymphocyte reaction (allo-MLR) and mitogen-induced responses. These abnormalities probably play a role in the immunological dysfunctions underlying chronic liver diseases. Twenty one patients with biopsy-proven CAH-B and a significantly lowered CD4:CD8 cell number ratio were treated with thymic extract (Thymomodulin-TFX) for 6 months. The results of immunological, serological and biochemical findings indicate that this preparation has an immunoregulatory action and produces beneficial clinical effect in patients with CAH-B.

Adult↗