A nurse is assessing a client who is taking disulfiram and consumed alcohol. Which of the following findings is the priority for the nurse to report to the provider?

Disulfiram is an aldehyde dehydrogenase inhibitor used as an aversion therapy for alcohol use disorder. It causes the accumulation of acetaldehyde in the blood if ethanol is consumed, leading to a highly unpleasant and dangerous disulfiram-ethanol reaction. This reaction can escalate from mild discomfort to cardiovascular collapse and respiratory failure. Rationale: A. A headache is a distressing part of the disulfiram-ethanol reaction, but it is not the most life-threatening symptom. While the client may experience significant throbbing and pain, the nurse must prioritize the assessment of ABCs (airway, breathing, and circulation). A headache does not signal the immediate hemodynamic instability that requires the highest level of emergency medical intervention. B. Flushing of the face and neck occurs due to acetaldehyde-induced vasodilation and is one of the first signs of the reaction. While visually prominent, flushing itself does not pose an immediate threat to the client’s life. The nurse should document the finding but focus on identifying more severe symptoms that indicate the client is entering a stage of cardiovascular shock. C. Hypotension is the priority finding because it indicates severe cardiovascular collapse resulting from profound vasodilation and increased capillary permeability. Significant drops in blood pressure during a disulfiram reaction can lead to shock, myocardial infarction, or death. The nurse must report this immediately so that emergency resuscitation, including intravenous fluids and vasopressors, can be initiated to stabilize the client. D. Nausea and vomiting are very common during the disulfiram-ethanol reaction and serve as the primary "aversion" mechanism of the drug. Although these symptoms are highly uncomfortable and can lead to dehydration, they are not as immediately fatal as profound hypotension. The nurse should manage the vomiting but prioritize reporting the signs of circulatory failure to the healthcare provider.