Biomedical subjects

J Sitar

Publications and source records attributed to J Sitar.

At least 19 recordsLinked to original sources

PubMed1991

[Preventive care in patients with cardiac and vascular diseases during weather changes].

The author analyzes possible mechanisms of the development or deterioration of cardiovascular disorders in conjunction with changes of the weather. These mechanisms act not only at a cellular but also at a molecular and ionic level. Attention concentrates mainly on striking changes of blood clotting, aggregation of blood elements and viscosity of the blood. The author recommends some general ad special provisions to be taken before or during a change of weather by healthy hypersensitive subjects and by cardiovascular patients. The author emphasizes the necessity of close contact with the attending physician and the need to collect more findings, in particular experimental ones.

Blood Coagulation↗

PubMed1991

[Causes of exacerbation of diseases in the spring and fall].

The author draws attention to the fact that marked semi-annual changes of geomagnetic disturbances in spring and autumn could contribute also to the development or exacerbation of some pathological conditions. It is known that this semi-annual variation is displayed in particular by peptic ulceration of the stomach and duodenum, some forms of bronchial asthma, endogenous depressions, tetanic syndrome and liability to hyperglycaemia in obese diabetics. He refers to the parallel phenomenon in cardiovascular disorders. The author proved already previously that short-term (semilunar) geomagnetic changes correlate with adverse influences on the cardiovascular system, although the mechanism is probably different. He reflects also why in this context there are not two peaks of cardiovascular deaths in the course of the year. The concept of living environment is extended in recent decades also to cosmic space. Although some pathological conditions have a complicated genesis, in serious research it probably will not be possible to omit cosmic influences.

Cardiovascular Diseases↗

PubMed1991

[Correlation of certain parameters of solar winds and sudden cardiovascular deaths].

In day-to-day investigations the closest correlation with sudden cardiovascular mortality is displayed by the density of solar wind. An increased mortality is recorded after its brisk rise (in particular after potent proton phenomena) and paradoxically also in case of very low density value. Minor proton phenomena and eruptions with X-ray emission did not influence the mortality in the authors' group. This type of increased solar activity thus should not influence the prognosis of morbidity and mortality from cardiovascular diseases. When mean monthly density values of solar wind are correlated with mortality, the relationship is paradoxically indirect. The rate and temperature of the solar wind does not play any part due to its phase retardation after increased density. The correlation of mean annual values of all parameters of solar wind (i.e. density, velocity and temperature) and mortality is also indirect. There is no explanation so far for the increased mortality during low density levels during the interval between two rises in the course of day-to-day monitoring. For the short-term mortality prognosis thus potent proton phenomena can be used; the effect of very low values of solar wind density will have to be confirmed. The biogenic action of solar wind is obviously more complex than was formerly assumed.

Cardiovascular Diseases↗

PubMed1990

[The causality of lunar changes on cardiovascular mortality].

The author confirmed, based on different ways of processing of 1437 sudden cardiovascular deaths, that the frequency of these deaths changes in the course of the synodic moon with two maxima during the lunar quarters. Processing by the method of transfer of epochs made it possible to shift steadily the mortality curves according to the phase of solar activity. This made the author assume that the cause of the phenomenon of two-phasic change of mortality during lunation cannot be only gravitation (sudden tides) and that in addition the interfering influence of solar corpuscular radiation is involved. It is known that this radiation causes geomagnetic disorders. Consistent with the above view it was proved that in the course of lunation the greatest number of geomagnetic disorders occur at a time close to the lunar quarters. Then, as the author proved--aurora polaris is more frequent. The increased cardiovascular mortality is thus associated with an increased geomagnetic activity. The relationship is certainly not direct. The author indicates further trends of research to disclose the immediate causes which exert an unfavourable effect on our cardiovascular system.

Cardiovascular Diseases↗

PubMed1989

[Weekly biological rhythms in morbidity and mortality due to cardiovascular diseases].

Any assessment of the weekly rhythm of morbidity due to cardiovascular diseases should take into account the fact that as regards minor cases the rate of admission to the internal department outpatient unit is greatly distorted by the psychosocial factor, due to which the maximum number of admissions is on Mondays, the minimum on Saturdays; also Sundays are noted for a relatively low rate of admissions. It the subjective factor is eliminated by focussing attention solely on sudden cardiovascular deaths we can see the curve of frequency running in absolute reverse, i.e., that, on the contrary, Saturdays and Sundays at at-risk days. Mondays remain high-risk days, too, though not quite so prominently. The author discusses the cause of the phenomenon warning of the breaches of set biorhythms and of spells of stress not only at work but also during weekend "leisure" due to excessive physical as well as mental exertion.

Cardiovascular Diseases↗

PubMed1989

[The effect of solar activity on lunar changes in cardiovascular mortality].

After a 9-year follow-up of mortality due to cardiovascular emergencies (a total of 1,437 cases), the author found its frequency to be correlated with the moon phases. There are two maximum and minimum risk periods during lunation; the differences between them have a high statistical significance. The mortality study which registered the cases according to separate periods of maximum solar activity (spots, eruptions, etc.), medium and minimum activity recorded on three individual curves, showed that the maximum and minimum mortality curves were shifting in time phase so that during high solar activity, the minimum mortality was nearer to the new moon and full moon phases, while the maximum death rate approached the first and last lunar quarters; during the medium and low solar activities, the mortality maxima and minima were shifting counterclockwise the moon's orbit round the Earth, i. e. from the Earth's view with the Sun moving more and more to the west. The author offers some probable explanations for this phenomenon, which can help to make a more exact prognosis of critical days for patients with cardiovascular disorder. In addition, these findings can contribute to basic helio-geophysical research.

Cardiovascular Diseases↗

PubMed1988