Diagnostic Procedures and Postprocedure Monitoring

General Postprocedure Care and Contrast Media Safety

Postprocedure monitoring requires systematic data collection to ensure client safety and identify complications early. The licensed practical nurse (LPN) collects postprocedure vital signs and compares them directly to preprocedure baseline values. Any vital sign instability, bleeding, or sudden mental status changes must be immediately reported to the registered nurse (RN). The LPN inspects procedural dressings for active bleeding, excessive drainage, and hematoma formation. When drainage is present on a dressing, the LPN outlines the perimeter and records the date and time directly on the bandage to monitor for expansion. In addition, the LPN monitors fluid intake and urinary output to evaluate postprocedure hydration and kidney function, while reinforcing prescribed postprocedure activity restrictions, mobility limitations, and positioning instructions.

Prior to procedures involving iodinated contrast media, the LPN collects information about prior contrast reactions and reported allergies, including any history of a shellfish allergy, and reports relevant findings to the RN. While clients often believe a shellfish allergy dictates contrast risk, a shellfish allergy does not specifically predict a contrast reaction. During the injection, clients may experience unexpected sensations. The LPN reinforces teaching that a warm sensation or a metallic taste is a common, transient response to intravenous contrast injection rather than an allergic emergency.

Contrast media can produce adverse physiological responses ranging from mild hypersensitivity to life-threatening reactions. Mild reactions include localized urticaria, pruritus, mild flushing, and rhinorrhea. Moderate reactions can present with generalized hives, facial swelling without breathing difficulty, mild wheezing without hypoxia, and persistent vomiting. Severe reactions include laryngeal edema, severe bronchospasm, profound hypotension, and anaphylactic shock. The LPN immediately reports signs of dyspnea, stridor, or facial swelling after contrast administration to the RN. Beyond acute allergic responses, contrast-associated acute kidney injury is identified by a rise in serum creatinine after contrast exposure, and decreased urine output may also occur. The LPN monitors and records urine output after contrast procedures as ordered and reports decreased output to the RN. If not contraindicated, the LPN encourages oral fluid intake postprocedure to help flush contrast media from the kidneys. Metformin is not routinely held for every iodinated contrast procedure; the LPN checks for and follows orders to withhold it when indicated by acute kidney injury, reduced kidney function, or the type of contrast procedure, and reports concerns to the RN.