[Hemodynamics of patients with essential hypertension in mild infrared hyperthermia]. / Untersuchungen zur Hämodynamik bei Patienten mit essentieller Hypertonic unter milder Infrarot-Hyperthermie (IRA-Therm II).

Hyperthermia therapy in hypertensive patients is been discussed as an effective treatment. The aim of this study was to control the behaviour of circulation in conditions of hyperthermia. A group of 6 males, 32-53 years old, suffering from essential hypertension stage I-II underwent a single whole body-irradiation with near infrared (IRA), lasting over one hour. The body temperature rises up to maximal 38.5 degrees C. Before, during and after treatment the blood pressure (BP), the heart rate (HR), the stroke volume (SV), the cardiac output (CO) and the ejection fraction - measured by radionuclide ventriculography - where estimated and the peripheral arterial mean pressure (Pm), the ejection resistance (AW) and the Total peripheral resistance (TpW) were calculated. During irradiations there was a significant decrease of BP, AW and TpW. HR, SV, CO and EF increased significantly. Due to IRA irradiations there was a change in microcirculation with the consequence of lowering the blood pressure. The concomitant stimulation of the heart was well compensated as shown by CO, SV and EF.