Syncope-like events during cervical drain removal after thyroid surgery: a narrative review and safety-oriented research framework

Background and Objective: Cervical drains are used selectively after thyroid surgery, but pallor, diaphoresis, presyncope or syncope, bradycardia, and hypotension temporally associated with drain removal have not been characterized adequately. A reflex response may be benign, yet similar findings can accompany cervical hemorrhage, airway compromise, hypocalcemia, arrhythmia, or metabolic disturbance. This narrative review evaluates the evidence gap, plausible mechanisms, urgent differential diagnoses, and research priorities. Methods: PubMed/MEDLINE, CINAHL Complete, and Embase were searched through August 7, 2026. English-language adult human studies, reviews, guidance, and informative case reports informed a narrative synthesis. Independent duplicate screening, a record-level selection log, and formal risk-of-bias or certainty assessment were not undertaken. A focused PubMed sensitivity check was added during revision. Key Content and Findings: Within the literature identified, no study provided a denominator-based estimate or independent predictors of syncope specifically during cervical drain removal after thyroid surgery. The identified evidence is indirect, comprising thyroid-drain studies, cervical case reports, reflex-syncope physiology, postoperative orthostatic-intolerance studies, and thyroid-surgery safety guidance. These sources support biologic plausibility but not causal attribution or a preventive protocol. Relevant reports could have been missed. A hypothesis-generating framework and minimum data set are proposed for future observation. Urgent postoperative alternatives remain the priority. Conclusions: Current evidence cannot define incidence, mechanism, predictors, or effective prevention. The proposed safety-oriented framework should be treated as a research and documentation aid, not a validated standard of care, and requires prospective multicenter evaluation.