[Influence of the atmospheric pressure and other variable weather on the incidence of the subarachnoid hemorrhage]. / Influencia de los cambios de presión atmosférica y otras variables meteorológicas en la incidencia de la hemorragia subaracnoidea.

UNLABELLED: Spontaneous subarachnoid hemorrhage is a pathology usually related to risk factors, such as arterial hypertension and/or nicotine poisoning. Nevertheless, other variables exist, like meteorological changes, that although the experience aims as possible responsible for an increase of the incidence, are still not established like such. OBJECTIVE: It is to investigate the influence of the meteorological changes, either seasonal variations or changes of atmospheric pressure, in the incidence of the subarachnoid hemorrhage. METHOD: All the cases of spontaneous subarachnoid hemorrhage are considered from the 1st of January from 1997 to the 31st of March of 2008, making a medical registry of demographic aspects (age, sex) and antecedents (arterial hypertension, diabetes mellitus, cerebral ischemia, nicotine poisoning), as well as numbers of atmospheric pressure (in hectopascales, hPa), daily temperature and relative humidity, throughout this period, with a calculation of the maximum, average and minimum values, as well as pressure differentials between consecutive days. RESULTS: The analysis of the 173 gathered cases showed a predominance of the subarachnoid hemorrhage in female, specially the aneurismal ones, being arterial hypertension, the main factor of related risk. Significant differences between the days with and without hemorrhage were not demonstrated, in relation to the variation of atmospheric pressure (p 0.463), pressure temperature (p 0.381) and relative humidity (p 0.595) throughout the day. CONCLUSION: In our element, the variations of atmospheric pressure are not related to an increase of incidence of the subarachnoid hemorrhage. Instead of this, cases of subarachnoid hemorrhage take place with changes of hardly 1.7 (1-3) hPa in the day, without observing a clear seasonal tendency.

Influencia de los cambios de presión atmosférica y otras variables meteorológicas enla incidencia de la hemorragia subaracnoidea / No disponible

La hemorragia subaracnoidea espontánea es unapatología que habitualmente se relaciona con factoresde riesgo, tales como la hipertensión arterial y/o eltabaquismo. Sin embargo, existen otras variables, comolos cambios meteorológicos, que aunque la experienciaapunta como posibles responsables de un aumento de laincidencia, todavía no están establecidas como tales.Objetivo. Investigar la influencia de los cambiosmeteorológicos, ya sean variaciones estacionales ocambios de presión atmosférica, en la incidencia de lahemorragia subaracnoidea.Método. Se consideran todos los casos de hemorragiasubaracnoidea espontánea desde el 1 de enero de 1997al 31 de marzo de 2008, realizando un registro de aspectosdemográficos (edad, sexo) y antecedentes médicos(hipertensión arterial, diabetes mellitus, patologíacerebrovascular, tabaquismo), así como de las cifrasde presión atmosférica (en hectopascales, hPa), temperaturay humedad relativa diarias, a lo largo de dichoperiodo, con un cálculo de los valores máximo, medioy mínimo, así como de las diferencias de presión entredías consecutivos.Resultados. El análisis de los 173 casos recogidosmostró un predominio de la hemorragia subaracnoideaen el sexo femenino, especialmente la de origenaneurismático, siendo la hipertensión arterial, el principalfactor de riesgo relacionado. No se demostrarondiferencias significativas entre los días con y sin hemorragia,en relación a la variación de presión atmosférica(p 0.463), temperatura (p 0.381), humedad relativa (p0.595) a lo largo del día.Conclusión. En nuestro medio las variaciones depresión atmosférica no se relacionan con un aumentode la incidencia de la hemorragia subaracnoidea, produciéndoseésta con cambios de apenas 1,7 (1-3) hPaen el día, sin que se observe una clara tendencia estacional (AU)

Spontaneous subarachnoid hemorrhage is a pathologyusually related to risk factors, such as arterialhypertension and/or nicotine poisoning. Nevertheless,other variables exist, like meteorological changes, thatalthough the experience aims as possible responsible foran increase of the incidence, are still not established likesuch.Objetive. It is to investigate the influence of themeteorological changes, either seasonal variations orchanges of atmospheric pressure, in the incidence of thesubarachnoid hemorrhage.Method. All the cases of spontaneous subarachnoidhemorrhage are considered from the 1th of Januaryfrom 1997 to the 31th of March of 2008, making amedical registry of demographic aspects (age, sex) andantecedents (arterial hypertension, diabetes mellitus,cerebral ischemia, nicotine poisoning), as well as numbersof atmospheric pressure (in hectopascales, hPa),daily temperature and relative humidity, throughoutthis period, with a calculation of the maximum, averageand minimum values, as well as pressure differentialsbetween consecutive days.Results. The analysis of the 173 gathered casesshowed a predominance of the subarachnoid hemorrhagein female, specially the aneurismal ones, beingarterial hypertension, the main factor of related risk.Significant differences between the days with andwithout hemorrhage were not demonstrated, in relationto the variation of atmospheric pressure (p 0,463),pressure temperature (p 0,381) and relative humidity (p0,595) throughout the day (..) (AU)