Laterality Conflict Between the Prescription and the Plan at the Time-Out
A 47-year-old woman with left-sided breast cancer treated by mastectomy and chemotherapy is scheduled for postmastectomy radiotherapy, including a left supraclavicular field. At the time-out before fraction 1, the therapist notices that the printed prescription and the approved plan both specify the left supraclavicular fossa, but the most recent physician progress note, written by the covering resident after the attending left for a conference, states right supraclavicular field, 50 Gy in 25 fractions. The therapist calls the resident, who says the attending dictated the note and that the therapist should just treat what the plan says and the paperwork will be sorted out later. The attending is not reachable by phone. The patient is on the couch, the mask is set, and the room is ready.
1. What should the therapist do at this point, and what is the reasoning?
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Stop. Do not treat. A conflict about laterality between two source documents is a stop-the-line event, not a paperwork issue. The therapist cannot know which document is correct, and the consequence of choosing wrong is irradiation of the wrong side of the neck and supraclavicular fossa, with the correct side left untreated.
The reasoning is that laterality errors are among the most consequential preventable events in radiotherapy, and they are almost always caught at exactly this point, by a person comparing documents rather than trusting one. The approved plan and the printed prescription agreeing with each other is reassuring but not sufficient, because both could derive from the same error earlier in the chain.
Actions: keep the patient on the couch and explain that a check needs to be completed before treatment starts. Verify the laterality against the original pathology report and the staging imaging. Ask the resident to produce a written, signed order, not a verbal assurance. Contact the attending by whatever route is available or escalate to the on-call attending or department chair. Document the discrepancy, the time, who was contacted, and the resolution in the treatment record.
2. The resident repeats that the attending approved the plan verbally and insists the therapist proceed. What are the therapist's obligations, and what options exist?
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The therapist's obligation is to the patient, and it is not discharged by following an instruction that the therapist knows rests on an unresolved conflict. A verbal assurance from a resident is not a substitute for a signed prescription when the written documents disagree, and it cannot authorize treating the opposite side from the approved plan. Proceeding would make the therapist a participant in a potentially catastrophic error.
The therapist declines clearly, without hostility, and states the reason in one sentence: the documents conflict and the conflict must be resolved in writing before treatment. Then escalate: the chief radiation therapist, the medical physicist, the on-call attending, and if necessary the department chair or the quality and safety officer. The department should have a written policy for after-hours escalation, and this is the moment to use it. Filing a safety report is part of the job, not an act of disloyalty.
If no one can resolve the conflict, the fraction is not delivered and the delay is documented with the reason. A delayed fraction is recoverable; a wrong-side treatment is not. The therapist should also note that the resident is under pressure and may be acting in good faith, so the escalation should be framed around the patient and the documents, not around the resident's competence.
3. What system changes would reduce the chance of this happening again?
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A structured time-out that explicitly reads the patient's identity, the site, and the laterality aloud, with a second person independently checking the prescription, the plan, and the diagnostic imaging. Laterality should be confirmed against source documents, not against a document derived from them.
One authoritative written prescription, signed before simulation, with changes permitted only by a signed addendum or a documented verbal order with read-back that is signed within a defined window. A progress note should never be able to contradict an approved plan without triggering a review.
A hard stop in the record-and-verify system when laterality or site fields disagree, so the machine will not enable the beam until the conflict is cleared. A monthly review of near misses with a non-punitive reporting culture, following a failure-mode approach such as TG-100, so that the therapist who catches the next one is thanked rather than discouraged.
Finally, cover arrangements should include a rule that the covering clinician does not alter a plan or prescription without the attending's documented agreement, and that staff know whom to call when the attending is unreachable.