Annual fluctuations of the cardio‐vascular mortality rate in the city of Cluj

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Abstract
The possible existence of a seasonal distribution of the cardio‐vascular mortality in Cluj has been studied and also cyclicity in relation to cardio‐vascular diseases: that is cerebro‐vascular accidents, myocardial infarction and chronic cardio‐pulmonary insufficiency. We have also checked whether meteorological conditions, such as atmospheric pressure, air temperature, relative humidity of the air, magnetic field strength and atmospheric turbulence, are related to cardio‐vascular mortality. The primary mortality data were obtained from the Central Bureau of Statistics. Among the cases reported as cardiac death, only those were selected in which the initial disease was cardio‐vascular. The records cover the years 1967 to 1969. The meteorological data were obtained from the Agronomical Institute of Cluj (Conf. G. Papp). Cardio‐vascular death in general does manifest a cyclical development during the year: The death rates are higher in the January‐May period and lower in the June‐September period. Death rates from the three main classes of cardio‐vascular disease showed similar cycles, but in certain cases a second peak (increased rate) was observed during spring time. A separate study of the death rate for the three affections showed that the cerebrovascular accidents present a lower frequency in the months of June to August and a higher frequency in winter and spring. The myocardial infarctions present a bimodal curve with a spring peak (March to April) and another with an autumn‐winter peak (October to December). The cardio‐pulmonary condition presents a bimodal‐curve with an increased incidence in winter (November to February) and another peak in spring‐time. Testing the meteorological conditions at cardio‐vascular death one can usually observe that there are no striking alterations in temperature, relative humidity or turbulence during the day of cardio‐vascular death or within a few days of this day. Concerning the atmospheric pressure: in the majority of the cases (over 60%) there were oscillations during the day of death. The most important changes during these days or within a few days of these days occurred in the magnetic declinograms. For example cerebro‐vascular accidents occurred only in 6–18% of the cases during the days of magnetic quietness but in 72–94% of the cases during days with magnetic perturbations. Cardio‐pulmonary deaths occurred in 100% of the cases during the days with magnetic perturbations.

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