During report the LPN is told that the patient has orthopnea due to valvular heart disease. The LPN expects to find the patient:

A. Assess the patient's appetite and thirst: While loop diuretics can cause dehydration, appetite monitoring is not the primary nursing priority for managing loop diuretic therapy. Thirst may occur, but it is a subjective symptom rather than a critical objective indicator of electrolyte imbalance. Clinical focus remains on metabolic and hemodynamic stability.

B. Monitor magnesium levels, as ordered: Loop diuretics inhibit the reabsorption of cations in the thick ascending limb of the loop of Henle. This mechanism leads to increased urinary excretion of magnesium alongside water and sodium. Hypomagnesemia can predispose the client to cardiac arrhythmias and muscle tetany.

C. Assess the client for gastric distress including nausea, vomiting and diarrhea: These gastrointestinal symptoms are not the most common or significant adverse effects of furosemide administration. While they can occur with many medications, they do not reflect the primary pharmacological risks associated with diuretic-induced fluid shifts. Monitoring should prioritize renal function and electrolyte concentrations.

D. Monitor the client's potassium levels as ordered: Furosemide promotes significant potassium wasting by increasing delivery of solutes to the distal tubule. Hypokalemia is a frequent and dangerous complication that can lead to life-threatening cardiac conduction disturbances. Frequent serum monitoring is essential to ensure the safety of the heart failure patient.

A. A marker of cardiac muscle damage: Troponin is a protein found specifically in cardiac myocytes that is released into the bloodstream when the heart muscle is injured. Elevated levels are the most specific and sensitive laboratory indicator for diagnosing an acute myocardial infarction. It allows healthcare providers to differentiate between unstable angina and true myocardial necrosis.

B. A level of an electrolyte that when abnormal may cause chest pain: Electrolytes such as potassium or magnesium can cause arrhythmias when abnormal, but they are not troponins. Troponin is a structural protein, not a charged ion involved in cellular electrical potential. Monitoring electrolytes is important in cardiac care, but it is distinct from the necrotic marker testing.

C. A marker of the amount of stretch the ventricle has done: The marker for ventricular stretch and fluid volume overload is Brain Natriuretic Peptide (BNP), not troponin. BNP is used to diagnose and monitor the severity of heart failure. Troponin specifically indicates cell death and injury rather than the degree of volume expansion or pressure within the heart.

D. A level of liver enzyme that can be elevated with right sided heart failure: Liver enzymes like ALT and AST may rise during systemic venous congestion, but they are not cardiac-specific. Troponin has no diagnostic value for liver function or hepatic congestion. It is used exclusively to evaluate the integrity of the myocardial tissue during suspected ischemic events.