Acute myocardial infarction occurrence: environmental links - Baku 2003-2005 data.
BACKGROUND
Despite substantial progress in modern preventive and clinical cardiology, acute myocardial infarction (AMI) remains a central acute cardiac event. The aim of this study was to check the basic daily environmental-physical conditions accompanying the occurrence of AMIs in a specific geographic area: Baku, Azerbaijan.


METHODS
AMIs registered in the Baku area by 21 first-aid stations (n=4919) during 2003-2005 were compared with daily geomagnetic activity (GMA) levels (I(0)-IV(0)) and cosmic ray activity (CRA), described by neutron (imp/min) and solar activity. The same comparison was made for pre-admission fatal AMIs (n=440). The cosmophysical data came from space science centers in the USA, Russia, and Finland.


RESULTS
AMI morbidity followed a daily distribution according to GMA, mostly on quiet (I(0)) GMA days. A monthly comparison showed inverse relationships with solar activity and GMA and correlation with CRA. The daily clinical parameters of AMI correlated with CRA. Despite the daily rise in AMI mortality on days with the highest GMA, the days with the lowest GMA and higher CRA were predominant for AMI occurrence and pre-admission mortality. One of the possible predisposing factors can be life-threatening arrhythmia.


CONCLUSIONS
The monthly number of AMIs was inversely related to monthly solar activity and correlated with CRA-neutron activity. Pre-admission AMI mortality was inversely linked with GMA. Daily AMI pre-admission mortality rose with concomitant GMA; low-GMA and higher-neutron-activity AMIs occurred much more frequently and were more strongly related to the number of fatal pre-admission AMIs. The clinical course of AMI was linked with CRA level.
Division of Cardiology, Rabin Medical Center, Petah Tiqwa, Israel.
Elyiahu
E
Stoupel
Elchin
E
Babayev
Elchin
E
Babyev
Fazil
F
Mustafa
Evgeny
E
Abramson
Peter
P
Israelevich
Jaquelin
J
Sulkes
D000208:Acute Disease; D001382:Azerbaijan; D003359:Cosmic Radiation; D016757:Death, Sudden, Cardiac / Q000453:epidemiology; D004574:Electromagnetic Fields; D005387:Finland; D006801:Humans; D008685:Meteorological Concepts; D009203:Myocardial Infarction / Q000453:epidemiology* / Q000401:mortality*; D009502:Neutrons; D011827:Radiation; D012426:Russia; D019445:Solar Activity; D014481:United States