A client is admitted to the emergency room with chest pain and a suspected diagnosis of acute myocardial infarction (MI). Which test would the nurse expect the physician to order to make a definitive diagnosis of MI?

Choice A rationale

A puncture or rupture of the lung is typically associated with a pneumothorax, not flail chest. Pneumothorax occurs when air leaks into the space between the lung and the chest wall.

Choice B rationale

The presence of air or gas in the pleural cavity is known as pneumothorax. Flail chest, however, is characterized by multiple rib fractures.

Choice C rationale

Flail chest occurs when multiple adjacent ribs are fractured in multiple places, creating a free-floating segment of the chest wall. This condition is serious and often results from blunt chest trauma.

Choice D rationale

The collapse of the lung is known as atelectasis or pneumothorax, not flail chest. Flail chest specifically refers to the detachment of a segment of the rib cage.

Choice A rationale

A complete blood count (CBC) can provide general information about the body's response to an MI, such as white blood cell count, but it is not definitive for diagnosing an MI.

Choice B rationale

A lipid profile measures cholesterol levels and helps assess cardiovascular risk, but it is not useful for diagnosing an acute MI.

Choice C rationale

An electrocardiogram (ECG) is essential for diagnosing an MI as it shows the heart's electrical activity and can indicate ischemia or infarction.

Choice D rationale

Troponin levels are the most specific and sensitive markers for myocardial infarction. Elevated troponin levels confirm heart muscle damage due to an MI, making it the definitive test.