Claustrophobia, Sedation Policy, and a Tight Knee MRI Slot
A 34-year-old woman is booked for a non-contrast right knee MRI after a twisting injury during recreational soccer. Her previous attempt at an outside clinic was stopped after 6 minutes because of a panic attack; she says she felt short of breath and 'needed out.' Today she arrives alone, having driven 40 minutes, and asks for 'something to calm me down.' Her heart rate is 112 beats/min, blood pressure 138/86, and she denies cardiac or respiratory disease. The protocol is 30 minutes on a 1.5 T scanner with a knee coil; the department has a 45-minute slot. Sedation requires an escort and a nurse-administered protocol, and the radiologist is working remotely. She is tearful but cooperative and says she will 'try anything' except a 'tunnel.' A wide-bore scanner is available but booked for another patient in 20 minutes.
1. Should you proceed now, reschedule, or arrange sedation? Give your reasoning and immediate plan.
Read the worked answer
There is no medical contraindication to MRI; the problem is anxiety and the safety of sedation. Because she drove herself and has no escort, do not administer sedation today under the stated policy. Sedation without an escort and monitoring would create a discharge risk and violate the departmental protocol.
A supervised trial without sedation is reasonable if she understands that she can stop at any time. Use the wide-bore scanner if it becomes available, position her feet-first so her head remains near or outside the bore, and use the knee coil. Provide earplugs, music, prism glasses or a mirror, a call bell, and a clear stop signal. Explain each sequence and its duration. Check her heart rate and symptoms before starting; if panic escalates, stop promptly.
If she cannot tolerate the trial, reschedule with an escort and a formal sedation plan. Do not give her someone else's medication or allow her to drive after sedation. Document the prior panic attack, today's vitals, the failed trial if applicable, and the discharge instructions.
2. How would you adapt the protocol and your communication to maximize the chance of a diagnostic study?
Read the worked answer
Prioritize the sequences that answer the clinical question and shorten the time in the magnet. For a knee, run the most important sagittal and coronal fluid-sensitive sequences first, then axial sequences, and omit nonessential extras if she is struggling. Use fast spin-echo sequences, parallel imaging if available, and the smallest coil that covers the knee well. Keep her informed between runs through the intercom: tell her how many seconds the next sequence will take and when she can expect a break.
Communication should be calm and concrete, not reassuring in vague terms. Say: 'The scanner is loud, but you will have a call bell; your head is near the opening; we can stop whenever you raise your hand.' Check in after each sequence and offer a short break if needed. Monitor for hyperventilation, numbness, or escalating panic.
If motion degrades images, repeat only the essential sequences. Tell the radiologist that the study was anxiety-limited and which sequences were obtained. Document the coping strategies used, her tolerance, and any sequences omitted.
3. She insists on sedation today. What constraints apply, and what alternatives can you offer?
Read the worked answer
Explain the policy plainly: sedation requires an escort, nurse administration and monitoring, appropriate fasting per protocol, and no driving afterward. She arrived alone and drove herself, so sedation cannot safely be given today. This is a patient-safety rule, not a scheduling preference.
Offer realistic alternatives:
- A non-sedated trial now with the wide-bore scanner and coping measures.
- Rescheduling with an escort and a planned anxiolytic or sedation protocol after clinical review.
- Asking her clinician about a short-acting anxiolytic for a future appointment, with instructions not to drive.
- If she has severe untreated anxiety, suggesting follow-up with her primary care clinician before the repeat attempt.
Do not let her take a friend's medication in the department. If she refuses all options, document the discussion, provide the reschedule pathway, and notify the referring clinician. The goal is a diagnostic study without creating a new risk from sedation or impaired driving.