Which electrocardiographic (ECG) change by a client with chest pain is most important for the nurse to report rapidly to the health care provider?

This statement indicates effective learning because serum cardiac markers are indeed proteins that are released from necrotic (damaged) heart muscle cells when there is myocardial injury, such as in acute coronary syndrome (ACS). These markers are measured in blood tests and help in the diagnosis and assessment of ACS, particularly myocardial infarction (heart attack).

Option A is incorrect because a nitroprusside stress echocardiogram is not used for acute pericarditis. It is a diagnostic test used for evaluating coronary artery disease and ischemia.

Option B is incorrect because a pathologic Q wave is not always present in the electrocardiogram (ECG) of patients with unstable angina. It is a characteristic finding in the ECG of patients with a previous myocardial infarction (heart attack) but may not be present in unstable angina.

Option D is incorrect because coronary angiography is not the only way to confirm the diagnosis of unstable angina. Unstable angina is primarily diagnosed based on the clinical presentation, symptoms, and changes in the ECG. Coronary angiography is an invasive procedure used to visualize the coronary arteries directly and is typically reserved for cases where further assessment and intervention are needed, such as in cases of suspected coronary artery disease.

Diuretics are the primary class of drugs used to treat volume overload in patients with acute decompensated heart failure (ADHF). These medications help to increase urine output, reducing the overall fluid volume in the body and relieving congestion in the lungs and other tissues.

The goal of using diuretics in ADHF is to alleviate symptoms such as shortness of breath, edema (swelling), and fluid retention by promoting the elimination of excess fluid. The most commonly used diuretics in this setting are loop diuretics (e.g., furosemide, bumetanide), which have a potent diuretic effect and can rapidly reduce fluid overload.

While narcotics, vasodilators, and positive inotropes may have roles in specific cases of ADHF, they are not the primary drugs used to treat volume overload. Narcotics may be used for pain management, vasodilators to reduce afterload (the resistance the heart has to pump against), and positive inotropes to increase the heart's contractility in certain situations. However, the first-line treatment for volume overload in ADHF is diuretic therapy.