ArticleCureus2025
The Effect of Diabetic Neuropathy on Recurrent Laryngeal Nerve Monitoring During Thyroid Surgery.
Article in Cureus, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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10 authors.
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Abstract
backgroundRecurrent laryngeal nerve (RLN) injury remains a significant complication of thyroid surgery, potentially leading to vocal cord paresis and compromised quality of life. Intraoperative nerve monitoring (IONM) enables real-time assessment of RLN function but may be affected by underlying neuropathies. Diabetes mellitus (DM) induces peripheral nerve damage, potentially altering RLN electrophysiology during surgery. This study investigates the impact of DM on RLN amplitude and latency during thyroidectomy.
methodsWe prospectively analyzed 245 patients (485 RLNs at risk) who underwent thyroidectomy with IONM between 2020 and 2024. Patients were classified as diabetic or non-diabetic according to American Diabetes Association (ADA) criteria. Standardized surgical and anesthetic protocols were followed. RLN amplitude and latency were measured before and after dissection using consistent stimulation parameters, and group comparisons were performed using non-parametric tests.
resultsThirty-four patients (13.9%) had diabetes, representing a more aged cohort with a higher prevalence of comorbidities than non-diabetic patients. Pre-dissection RLN amplitude and latency did not differ significantly between groups (0.72 mV vs. 0.74 mV, p = 0.87; 2.2 ms vs. 1.9 ms, p = 0.11, respectively). After dissection, diabetic patients showed a significantly greater reduction in RLN amplitude (median 0.58 mV vs. 0.77 mV in non-diabetics, p = 0.01), whereas latency remained comparable (p = 0.92). Within-group analysis confirmed a significant amplitude drop among diabetics (p = 0.008) but not among non-diabetics. Temporary unilateral vocal fold palsy occurred in three patients (one diabetic, two non-diabetic), all resolving within two weeks.
conclusionsDiabetic patients demonstrated greater RLN amplitude reduction during thyroidectomy, suggesting impaired neural resilience to surgical manipulation. However, these electrophysiological changes had minimal short-term clinical impact when nerve integrity was preserved. Awareness of this subclinical vulnerability may guide intraoperative decision-making within the context of neuroprotective strategies that involve IONM during thyroidectomy.
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