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Aim: To determine characteristics of a clinical course, 24-h profile of arterial pressure (AP), of renal hemodynamics, involvement of target organs in patients with arterial hypertension (AH) of the third degree and anomalies of renal arteries., Material and Methods: 24-h monitoring of AP, echocardiography, measurement of microalbuminuria, renal hemodynamic were made in 15 patients (9 female, 6 male) having resistant AH of the third degree and different anomalies of renal arteries (mean age 45.3 +/- 1.9 years). The control group consisted of patients with essential AH stage III (mean age 45.3 +/- 1.8 years). The groups were comparable by sex, age, duration of AH., Results: The patients of the study group had a significantly lower pulsatility index in the renal artery and interlobular level and resistance index at the segmental and interlobular level of the RA on the side of the anomaly. There was a significantly higher minimal diastolic blood flow velocity in the segmental level of RA on the side of the anomaly. Renal scintigraphy revealed a decreased index of radiopharmaceutical accumulation. A positive correlation was found between the pulsatility index, resistance at a segment RA level and variability, an increase of morning diastolic blood pressure. The groups had significant differences neither by 24-h AP indices nor by severity of target organ lesion., Conclusion: Patients with RA anomalies have specific renal hemodynamics determining renal hypoperfusion on the side of the anomaly which may be involved in development of resistance to hypotensive therapy.

A placebo-controlled parallel trial studied an antihypertensive action of interrupted normobaric hypoxia (INH) in 63 male patients with arterial hypertension (AH) of the first degree and low and moderate risk of vascular complications. The placebo group consisted of 18 patients with AH of the first degree matched by age, the disease duration, initial level of systolic and diastolic pressure. An INH course consisted of 15 daily procedures. INH monotherapy implied oxygen content lowering to 10%. A 6-month follow-up was made with the use of 24-h AP monitoring. The INH course resulted in a significant decrease in systolic and diastolic AP, total peripheral vascular resistance. A morning rise of systolic pressure became slower. A favourable effect of normobaric hypoxia on AP 24-h rhythm was observed. A good hypotensive effect was achieved in 85.7% patients. A 6-month follow-up confirmed a long-term hypotensive effect of INH.

A study was made of cell division in the corneal and tongue epithelium of white rats kept in a pressure chamber for 7 days (4 h daily) at a "height" of 9000 metres. Studies were performed at once and 3, 6 and 24 h after final exposition. After termination of hypoxia the rats showed pronounced inhibition of cell division. After three and 24 hours cell division in the corneal and tongue epithelium was activated. The number of pathological mitoses was increased at all the times of study. Following 3, 6 and 24 h the tongue epithelium demonstrated DNA synthesis activation.

A study was made of the changes in the mitotic activity, DNA synthesis, and the number of pathological mitoses after administration of the beta-adrenoblocker propranolol in the corneal and tongue epithelium of white rats kept in pressure chamber for 7 days (4 h daily) at a "height" of 9000 meters. The mitotic and the label indices (inclusion of 3H-thymidine by the epithelium nuclei) were analysed for mitotic activity and DNA synthesis, respectively. The experiments showed that the mitotic activity, DNA synthesis, the number of pathological mitoses were stabilized due to the propranolol administration.