Stanley Milgram's urban overload hypothesis suggests that people in urban environments are more likely to experience a decreased sense of responsibility and empathy towards others due to the overwhelming and stimulating nature of the environment. Therefore, if you have a heart attack, you would ideally want to be in a location where people are more likely to notice your distress and provide you with assistance.
In an urban environment, the high level of stimulation and distraction may make it less likely for people to notice someone in distress, or they may assume that someone else will take action. Therefore, it may be more beneficial to be in a less crowded and more supportive environment, such as a residential area or a healthcare facility, where people are more likely to notice and respond to a medical emergency. Additionally, being in close proximity to medical resources, such as hospitals or clinics, can improve the chances of receiving prompt and effective treatment in the event of a heart attack.