Pre-Procedure Assessment Before an Arterial Study
A 64-year-old man is scheduled for a diagnostic lower-extremity angiogram with possible intervention. During pre-procedure assessment you note: he takes metformin, has an eGFR of 38 mL/min/1.73 m², reports a prior 'reaction' to contrast that involved flushing and nausea but no hives or airway symptoms, and has a known abdominal aortic aneurysm. He is anxious and asks many questions about what will happen. His INR is 1.1 and platelets are 140,000.
1. Which pre-procedure issues require physician notification before the case, and why?
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Several findings change management and must be escalated:
- Renal function + metformin. eGFR 38 is reduced; iodinated contrast requires a minimized-volume strategy and hydration per protocol. Metformin and contrast carry a small risk of lactic acidosis if renal function worsens; many protocols hold metformin around contrast administration and recheck renal function before restarting. The exact hold/restart decision is physician- and protocol-driven - your job is to surface it.
- The 'reaction' history. Flushing and nausea without hives, wheeze, or hypotension is more consistent with a mild physiologic reaction than anaphylaxis, but it still should be characterized and documented precisely. Accurate characterization affects whether premedication is indicated and what emergency drugs are on hand.
- AAA. A known aneurysm is relevant to catheter/guidewire manipulation and to the approach; the physician should know.
- Coagulation. INR 1.1 and platelets 140,000 are generally acceptable for arterial access, but confirm against the institutional threshold and the planned intervention.
Surface all of these before the patient is on the table.
2. How should you address the patient's anxiety and questions while staying within your role?
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- Educate within scope: explain the sequence in plain language - prep and draping, local anesthetic at the groin, the catheter, the contrast injections and the warm flush sensation, and the need to lie still. Answer procedural questions you're qualified to answer; defer risk/benefit and consent questions to the physician.
- Use the assessment to reduce anxiety: explain what you're doing as you do it (checking pulses, placing monitors), give the patient a way to signal discomfort, and confirm understanding with teach-back.
- Do not promise outcomes or give clinical advice outside your role. If the patient asks 'will this fix my leg?' or 'what are the risks?', route to the physician and document that it was deferred.
- Reinforce instructions: NPO status, what to expect after (bed rest, pressure, when to call), and who to ask for questions.
The tested skill is scoping patient education correctly - informative and reassuring without overstepping into consent or prognosis.