With rising heat level it is getting hard for runners competing for the marathon, dehydration, heat stroke and sudden cardiac arrest are the primary reason for athletes collapsing, although sudden cardiac arrest is quite rare.
Canadian Medical Association Journal (CMAJ) has studied at recent data to guide clinicians on how to prevent and manage sudden cardiac arrest in competitive athletes.
Please go through Link for more details-
https://www.myhealthyclick.com/how-to-prevent-and-manage-sudden-cardiac-arrest-in-athletes/