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Biomedical subjects

H Riska

Publications and source records attributed to H Riska.

At least 19 recordsLinked to original sources
PubMed1992

Preventive effects of inhaled formoterol and salbutamol on histamine-induced bronchoconstriction--a placebo-controlled study.

The preventive effects of inhaled formoterol (a new beta 2-agonist) and salbutamol aerosols on histamine-induced bronchoconstriction were studied in 12 patients with mild or moderate asthma in a placebo-controlled, double-blind study. Three hours after the administration of 12 micrograms formoterol, 200 micrograms salbutamol (doses with equal bronchodilator effects) or placebo via aerosol, histamine challenge was undertaken, using a dosimetric jet nebulizer with controlled tidal breathing. The noncumulative dose of histamine diphosphate aerosol provoking a 15% fall in FEV1 (PD15) was calculated. The PD15 after inhalation of 12 micrograms formoterol was significantly higher than that after 200 micrograms salbutamol (median values 640 and 310 micrograms, respectively; p < 0.01). For both treatments, the PD15 was significantly higher than that after placebo (median 185 micrograms). The results indicate that the preventive effect against histamine-induced bronchoconstriction at 3 h after drug is significantly better with formoterol than with salbutamol when using inhaled doses with an equal acute bronchodilator effect.

Administration, Inhalation↗
PubMed1990

Effects of captopril on blood pressure and respiratory function compared to verapamil in patients with hypertension and asthma.

Seventeen adult patients with moderate and stable bronchial asthma and established essential hypertension (WHO I or II) were evaluated in a randomized, double-blind, crossover study of the effects of captopril (50-100 mg/day) and verapamil (160-240 mg/day) on blood pressure, orthostatic reactions, respiratory function, and asthmatic symptoms. The effect of both drugs on blood pressure was significant. Blood pressure (mean of 161/98 mm Hg initially) decreased to a mean of 147/90 and 160/91 mm Hg on captopril and verapamil, respectively, with normal orthostatic changes. There were no significant differences in forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1), maximal expiratory flow at 50% of FVC (MEF50), or peak expiratory flow (PEF) measurements at the end of each treatment period. The subjective severity of asthma did not change significantly during the trial. No significant cough symptoms were reported on captopril.

Aged↗
PubMed1988

Concentration of hyaluronic acid in pleural fluid as a diagnostic aid for malignant mesothelioma.

Hyaluronic acid (HA) was determined with a radiometric assay in the serum and pleural fluid of 85 patients with pleural effusions, including 15 with malignant mesothelioma, 32 with other cancer, 31 with nonmalignant inflammatory diseases, and seven with congestive heart failure. With a cutoff level at 100 mg/L, the pleural fluid concentration of HA was raised in 73 percent of patients (11 of 15) with malignant mesothelioma and in 23 percent with nonmalignant inflammatory diseases, but in none with other cancer and in none with congestive heart failure. The median concentration of pleural fluid HA was significantly higher in patients with mesothelioma than in those with other cancer (p less than 0.005). Determination of carcinoembryonic antigen (CEA) in pleural fluid further helped to differentiate between mesothelioma and other types of cancer; concentrations of CEA above 10 micrograms/L were found in four of 15 (27 percent) patients with mesothelioma, but in 38 percent of the patients with other cancer. We concluded that in the differential diagnosis of pleural effusions associated with malignant tumors a high concentration of HA in pleural fluid combined with a low concentration of CEA suggests malignant mesothelioma as opposed to other types of cancer.

Biomarkers, Tumor↗
PubMed1987

Comparison of the effects of an angiotensin converting enzyme inhibitor and a calcium channel blocker on blood pressure and respiratory function in patients with hypertension and asthma.

A series of 12 adult patients with stable bronchial asthma and an established diagnosis of essential hypertension (WHO I or II) were studied in a randomized double-blind crossover study to assess the effect of captopril (50-100 mg/day) and verapamil (160-240 mg/day) on blood pressure, lung function, and asthmatic symptoms. The effect of the medication on blood pressure was significant. Blood pressure (mean 164/103 mm Hg initially) decreased to a mean of 145/90 mm Hg and 155/92 mm Hg after 4 weeks on captopril and verapamil, respectively, with fewer orthostatic changes caused by captopril. There were no marked changes of asthmatic symptoms or peak flow (PEF) or forced expiratory volume (FEV1) measurements during the trial.

Aged↗
PubMed1986

Comparison of the efficacy of an ACE-inhibitor and a calcium channel blocker in hypertensive asthmatics. A preliminiary report.

A series of 8 adult patients with stable bronchial asthma and an established diagnois of essential hypertension (WHO I and II) was studied in a randomized double-blind cross-over study to assess the effect of captopril (50-100 mg/day) and verapamil (160-240 mg/day) on blood pressure, lung function and asthmatic symptoms. The effect of the medication on blood pressure was significant with a mean of 137/86 mmHg and 148/90 mmHg after 4 weeks on captopril and verapamil, respectively, with fewer orthostatic changes caused by captopril. There were no marked changes of asthmatic symptoms or peak expiratory flow (PEF) measurements during the trial.

Aged↗
PubMed1979

Tuberculosis and kidney transplantation.

Immunosuppressive treatment enhances the risk of pulmonary and other infections. Tuberculosis is a predictable complication in transplanted patients. The present material comprises 584 kidney transplantation patients, ten of whom had had a previous history of tuberculosis. After transplantation ten patients presented with pulmonary tuberculosis during immunosuppressive treatment. One of the patients to whom no prophylactic antituberculous treatment had been given presented with a relapsing tuberculosis. The results of routine antituberculous treatment were excellent, but graft and patient survival were disappointing among the tuberculosis patients.

Adult↗
PubMed1979

Pleural fluid lysozyme in human disease.

Lysozyme content was measured in the plasma and pleural fluid of 110 patients with pleural effusions of various causes. The concentration of pleural fluid lysozyme was significantly higher (P less than .001) in patients with tuberculous pleurisy than in those with primary pulmonary carcinoma, metastatic carcinoma of the lung, connective tissue disease, nonspecific pleurisy, or congestive heart failure. Tuberculous patients also had a significantly higher (P less than .001) pleural fluid-to-plasma lysozyme ratio than did the other patients. Plasma lysozyme activity did not differ significantly among the various patient groups. Lysozyme was identified immunohistochemically in epithelioid cell granulomas in tuberculosis, in activated macrophages in lymph nodes adjacent to tuberculous lesions, and in granulocytes in pleural empyema. No lysozyme was detected in neoplastic cells in pulmonary carcinoma. The results show that the determination of pleural fluid lysozyme is a simple, fast method for obtaining corroborative information in the differential diagnosis of tuberculous pleurisy.

Adolescent↗
PubMed1978

T and B lymphocytes in pleural effusions.

To determine the diagnostic significance of the determination of T and B lymphocytes in pleural fluid, we studied these cells in peripheral blood and in pleural fluid by means of surface markers. Our study comprised 30 patients suffering from pulmonary tuberculosis, pulmonary malignancy, connective tissue disease, nonspecific pleurisy or congestive cardiac failure. In pulmonary tuberculosis, both the percentage and absolute numbers of T lymphocytes in pleural fluid were significantly higher than in peripheral blood. In patients with pulmonary tuberculosis, pulmonary malignancy or nonspecific pleuritis, the percentages and absolute numbers of B lymphocytes were significantly lower in pleural fluid than in peripheral blood. Considered together with other clinical and laboratory indices, these determinations may aid in the differential diagnosis of pleurisy of various etiology.

Adult↗
PubMed1978

Systemic lupus erythematosus and DNA antibodies in pleural effusions.

The quantity of antibodies to double-stranded DNA (ds-DNA) in 53 pleural effusions from 48 patients was measured by means of a modified Farr technique. In 10 samples, binding of ds-DNA was greater than 5 mg/l (range 6--14 mg/l), five samples being from patients with systemic lupus erythematosus (SLE), four from patients with lung cancer, and one from a patient with pulmonary tuberculosis. After treatment of pleural effusion samples with DNase, there was a marked increase of ds-DNA binding in the SLE group (n = 5), but none in the lung cancer group (n = 7) or in 4 patients with pleural effusions of various origin. In pleural fluid, demonstration of antibodies to ds-DNA and anti-ds-DNA-ds-DNA complexes, unmasked by DNase, may prove valuable when differentiating clinical conditions with pleural effusions.

Antibodies, Antinuclear↗
PubMed1977

Acid glycosaminoglycans (mucopolysaccharides) in the differential diagnosis of pleural effusion.

Pleural fluid glycosaminoglycans (GAG) in 64 patients with various diseases were isolated by anion-exchange chromatography after proteolysis, and characterised by spectrophotometric, electrophoretic and enzymatic techniques. GAG concentrations ranged from 7 to 1178 microng hexuronate/ml pleural fluid. The highest values (1178, 161 and 160 micron/ml) were found in patients with diffuse mesothelioma. Over 90% of the pleural fluid GAG consisted of hyaluronic acid (HA) in these patients. In other types of pleural effusion the relative HA content varied from 42 to 70% of the total GAG. Determination of pleural fluid HA consequently appears extremely valuable in the diagnosis of the form of mesothelioma producing HA. The mean GAG concentration of pleural fluid was significantly higher in tuberculous pleurisy than in hydrothorax (P less than 0.01), secondary malignant pleural effusion (P less than 0.0005) and idiopathic pleurisy (Pless than 0.03). It was impossible to demonstrate definite correlations between GAG and protein, and GAG and glucose concentrations of pleural fluid.

Diagnosis, Differential↗