When preparing to assist with the insertion of a pulmonary artery catheter into a patient, the nurse will anticipate the need to perform which action?

Choice A rationale Diuretics are generally used to reduce fluid volume and lower preload in patients with heart failure or pulmonary edema. While a pulmonary artery catheter measures these pressures, administering diuretics right before insertion is not a standard procedural requirement. Doing so could actually alter the baseline hemodynamic data that the catheter is intended to measure, such as the pulmonary artery wedge pressure, which normally ranges from 4 to 12 mmHg. Choice B rationale Inserting a pulmonary artery catheter involves passing a balloon-tipped catheter through the right atrium and right ventricle. As the catheter tip touches the irritable endocardium of the right ventricle, it frequently triggers ventricular ectopy or even ventricular tachycardia. Continuous cardiac monitoring is vital to detect these dysrhythmias immediately so the clinician can reposition the catheter or provide treatment. This safety measure ensures patient stability during the invasive advancement of the device. Choice C rationale Auscultation of heart sounds is a standard part of a physical assessment but is not a practical or specific action for assisting with catheter insertion. The clinician performing the insertion relies on pressure waveforms displayed on a monitor to determine the location of the catheter tip. Listening to the heart would not provide real-time data on the catheter's position within the chambers or help mitigate the primary risks associated with the invasive procedure. Choice D rationale Cardiac enzymes such as Troponin I or T are biomarkers used to diagnose myocardial infarction or cellular damage. While these may be monitored in critically ill patients, they do not provide information relevant to the technical preparation or safety of inserting a pulmonary artery catheter. The procedure focuses on hemodynamic monitoring rather than diagnosing acute coronary syndromes, so checking these levels is not an anticipated or required step for the insertion process itself.