The effect of exposure to high-density automobile traffic either as a bicyclist or pedestrian was compared to minimal or no exposure to automobile traffic. It is hypothesized that direct exposure to automobile traffic has an effect on acute myocardial infarction (MI). This association was studied with 500 incident cases of MI diagnosed in the emergency rooms of several hospitals and compared to 1,000 other subjects who visited the same emergency rooms for reasons other than cardiovascular and respiratory diseases. All subjects were asked to report the amount of time that they spent exposed to high-density traffic over the past month prior to their hospital visit.
What type of study design is this?
A) Cross-sectional
B) Case-control
C) Retrospective cohort
D) Prospective cohort
E) Randomized clinical trial

Cases (individuals having a MI) and controls are recruited at hospitals as part of the study's design (other patients in the emergency room who did not have cardiovascular and respiratory diseases which may be associated with air pollution). A time-dependent measure of exposure to high-density motor traffic in the days before the emergency room visit is the exposure under investigation.

Myocardial infarction

When the heart muscle's supply of oxygen is inadequate in one or more places, a heart attack (myocardial infarction) results. When the heart muscle's blood supply is restricted, this occurs.

What signs indicate myocardial infarction?

Chest discomfort that radiates from the left arm to the neck, shortness of breath, sweating, vomiting, irregular heartbeat, and other symptoms are some of the signs and symptoms of MI.

What distinguishes a myocardial infarction from a heart attack?

This blood clot may prevent blood from reaching the heart muscle through the artery. When the heart muscle lacks oxygen and nourishment, ischemia occurs. Myocardial infarction, sometimes known as a heart attack, is the medical term for when ischemia causes damage to or death of a portion of the heart muscle.

learn more about Myocardial infarction here

https://brainly.com/question/1373449

#SPJ4