Syncope in the Chair During a Long Appointment
A 62-year-old woman is 90 minutes into a 2-hour appointment for multiple restorations. She has a history of hypertension controlled with a beta-blocker and reports she 'didn't eat much' before her 8:00 AM appointment because she was nervous. At 9:30 AM the assistant notices she has become pale, her skin is clammy, and she says she feels 'lightheaded and hot.' Her pulse is rapid and thready, and she is breathing quickly. The dentist is working on tooth #14 and has a rubber dam in place. The patient's blood pressure was 138/86 at the start of the appointment.
1. What is the most likely diagnosis, and what are the immediate steps?
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Most likely: vasovagal syncope (or presyncope) from a combination of fasting, anxiety, and prolonged supine positioning. The pale, clammy skin, lightheadedness, and rapid thready pulse fit the prodrome. The beta-blocker blunts the expected compensatory tachycardia, so the pulse may not look as dramatic as expected, but the picture is still consistent.
Immediate steps, in order:
- Stop treatment. Remove the rubber dam and any instruments from the mouth.
- Position the patient supine with legs elevated (Trendelenburg) to restore cerebral perfusion. If she is already supine, elevate the legs.
- Loosen tight clothing and ensure an open airway.
- Check vital signs - pulse, respirations, and, if available, blood pressure and oxygen saturation.
- Give a sugary drink if she is conscious and can swallow - this addresses the fasting component and is appropriate for a conscious patient with a presumptive vasovagal episode.
- Monitor until she is fully recovered, then reassess whether to continue.
The key judgment: do not continue the procedure until she is stable and the cause is addressed. A 2-hour appointment in a fasting, anxious patient is a setup for this.
2. The patient recovers after 10 minutes and says she feels fine. Should the appointment continue? What should the team have done differently, and what should happen next time?
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Do not simply resume. 'Feels fine' after a syncopal episode is not the same as 'is stable.' The team should:
- Recheck vitals and confirm they are back to baseline.
- Ask about symptoms (nausea, residual dizziness).
- Consider whether the remaining work can be done in a shorter session or rescheduled.
If the dentist elects to continue, it should be with the patient's informed agreement, with the chair in a more upright position, and with a plan to stop if symptoms recur.
What should have been done differently:
- Pre-appointment screening for fasting and anxiety. A patient who skipped breakfast before a 2-hour appointment should be advised to eat, or the appointment should be shortened.
- Positioning - long supine procedures in anxious patients increase syncope risk; periodic upright breaks help.
- Monitoring - a patient 90 minutes into a long appointment should have had vitals checked at intervals.
Next time: schedule shorter appointments, advise a light meal beforehand, consider anxiety management, and have a written protocol for syncope that the whole team knows.