Which laboratory value change is expected with kidney failure?

A. The heart stops working to pump blood to the body:Cardiac arrest may occur as a complication of a myocardial infarction, but it does not precede the event. Before an MI, the heart continues to pump, although its tissue may be ischemic.

B. The blood is too thin:Thin blood, or decreased viscosity, is not a typical precursor to myocardial infarction. MI is primarily caused by blockage of coronary arteries, not changes in blood thickness.

C. The hemoglobin count is low:Low hemoglobin can reduce oxygen delivery to tissues but is not the direct cause of a myocardial infarction. An MI results from sudden obstruction of blood flow rather than anemia.

D. The blood supply to the heart is suddenly cut off:A myocardial infarction occurs when a coronary artery becomes blocked, often due to plaque rupture and thrombosis, resulting in sudden cessation of oxygen-rich blood to a portion of the heart muscle. This ischemia triggers myocardial cell injury and death, which defines the infarction.

A. Cramping and diarrhea:Cramping and diarrhea are gastrointestinal symptoms and are not typical warning signs of a myocardial infarction. While some cardiac events can cause nausea, generalized GI cramping and diarrhea are not reliable indicators of cardiac ischemia.

B. Sudden dyspnea:Sudden shortness of breath can occur during a myocardial infarction due to left ventricular dysfunction, pulmonary congestion, or reduced oxygen delivery. Dyspnea may be an early or primary symptom, especially in women, older adults, or those with diabetes.

C. Anxiety and fear:Anxiety, restlessness, or a sense of impending doom is a common neuropsychological response to myocardial ischemia. It results from sympathetic nervous system activation in response to cardiac stress and inadequate perfusion.

D. Excessive sweating:Diaphoresis is a classic autonomic response to myocardial infarction, caused by sympathetic activation. It is often cold and clammy, reflecting the body’s stress response and perfusion compromise.

E. Chest pressure:Chest discomfort, pressure, tightness, or pain is the hallmark symptom of myocardial infarction. It typically occurs in the substernal region and may radiate to the arm, jaw, neck, or back, indicating myocardial ischemia and injury.