Major Registry Study Finds Vocal Fold Paralysis Surgery Is Remarkably Safe

Surgery to restore the voice or reopen a narrowed airway in patients with vocal fold paralysis carries a strikingly low risk of short-term complications, according to one of the largest multi-institutional analyses of its kind. Drawing on more than fifteen years of data from the American College of Surgeons National Surgical Quality Improvement Program, or ACS-NSQIP, researchers identified 931 patients who underwent laryngeal procedures for either unilateral or bilateral vocal fold paralysis between 2008 and 2023. Across the entire cohort, the overall thirty-day complication rate was just 3.3 percent, and the reoperation rate was below one percent. No patient with bilateral paralysis and only a single patient with unilateral paralysis required prolonged postoperative ventilation beyond forty-eight hours. The findings, published in BMC Plastic and Reconstructive Surgery, offer clinicians robust benchmark data for counseling patients before they commit to phonosurgical intervention.

Vocal fold paralysis occurs when the nerves supplying the vocal folds, most commonly the recurrent laryngeal nerve, are damaged or dysfunctional, leaving one or both folds unable to move properly. The condition is far more often unilateral than bilateral, and the two presentations pose fundamentally different clinical problems. Patients with unilateral vocal fold paralysis typically struggle with a breathy, weak voice, difficulty swallowing, and an elevated risk of aspiration because the paralyzed fold cannot close the glottis during speech or swallowing. Bilateral paralysis, by contrast, can be life-threatening: when both folds are immobile near the midline, the airway itself may be obstructed, sometimes constituting a surgical emergency. Most cases in adults follow iatrogenic injury during thyroid, cardiothoracic, or esophageal surgery, while malignancies of the lung and larynx, stroke, trauma, and idiopathic causes account for much of the remainder.

The therapeutic arsenal for these patients is broad and reflects the divergent goals of treatment. For unilateral paralysis, surgeons aim to reposition or bulk up the immobile fold so that it can meet its functioning partner. Temporary options include hyaluronic acid injection, while calcium hydroxylapatite provides medialization lasting roughly eighteen months on average and autologous fat around six to twelve months. When the glottal gap exceeds three millimeters, framework surgery such as type I thyroplasty, sometimes combined with arytenoid adduction, is generally preferred and achieves voice improvement in eighty to ninety percent of cases. Laryngeal reinnervation, which reroutes nerve supply such as the ansa cervicalis to the recurrent laryngeal nerve, does not restore dynamic movement but improves static competence, muscle tone, and long-term stability by preventing denervation atrophy. For bilateral paralysis, the priority shifts to enlarging the airway through posterior cordotomy, partial or subtotal arytenoidectomy, or cordectomy, procedures that achieve decannulation rates of eighty-seven to one hundred percent among tracheostomized patients, albeit with substantial revision needs.

Despite the maturity of these techniques, the evidence base for their safety has remained surprisingly thin. Most published series are small, single-center studies drawn from homogeneous patient populations, leaving clinicians without reliable, generalizable estimates of perioperative risk. The new analysis was designed to close that gap. The investigators queried the ACS-NSQIP database, a prospectively maintained registry that collects standardized perioperative data from more than six hundred participating hospitals, using diagnostic codes for vocal fold paralysis and paresis together with a comprehensive list of procedural codes covering injection laryngoplasty, framework surgery, glottis-enlarging procedures, and reinnervation. Complications were aggregated into composite outcomes: surgical complications such as infections, wound dehiscence, and bleeding; medical complications ranging from pneumonia and reintubation to stroke, cardiac arrest, and sepsis; and an overall composite that also included reoperation.

The resulting cohort closely mirrored the expected epidemiology of the disease. Of the 931 patients, 857, or ninety-two percent, had unilateral paralysis, while seventy-four, or eight percent, had bilateral disease. Mean age was about sixty years in both groups, body mass index averaged twenty-nine kilograms per square meter, and roughly fifty-five percent of patients were women, a balanced sex distribution the authors suggest may more accurately reflect the true epidemiology than the divergent ratios reported in smaller studies. The majority of patients in both groups were classified as American Society of Anesthesiologists class three, indicating severe systemic disease, underscoring that these procedures are routinely performed in medically complex individuals. Most operations, around ninety percent in each group, were completed on an outpatient basis, with mean operative times of roughly one hundred minutes.

The safety outcomes were remarkably consistent across the two diagnostic groups. The overall complication rate was 3.4 percent for unilateral cases and 2.7 percent for bilateral cases, a difference that was not statistically significant. Reoperation was required in 0.93 percent of unilateral and 1.4 percent of bilateral patients, while surgical complications occurred at nearly identical rates of about 1.5 percent in both groups. Medical complications arose in 1.4 percent of unilateral cases and none of the bilateral cases. There were no significant between-group differences in superficial or deep infections, organ space infection, wound dehiscence, bleeding, pneumonia, reintubation, prolonged ventilation, urinary tract infection, stroke, cardiac arrest, myocardial infarction, deep vein thrombosis, sepsis, or septic shock. Notably, the analysis recorded no cases of sepsis, septic shock, or organ-space infection at all, findings the authors interpret as validation of established perioperative safety protocols.

The single patient who required ventilation beyond forty-eight hours illustrates how baseline frailty, rather than the procedure itself, can drive adverse outcomes. The individual was an eighty-year-old, ASA class three patient with congestive heart failure and hypertension who experienced a cascade of postoperative events including unplanned reintubation, cardiopulmonary resuscitation, blood transfusion, reoperation, and prolonged ventilation. Although no causal inference can be drawn from a single observation, the case highlights the importance of preoperative risk stratification in this population. This concern is particularly relevant given the burden of chronic pulmonary disease in the cohort: 8.1 percent of patients had chronic obstructive pulmonary disease, yet only six cases of pneumonia, or 0.64 percent, and a single reintubation, or 0.11 percent, were observed across the entire study period, figures consistent with or better than historical single-center series.

These results arrive amid ongoing debate about the optimal timing of surgery. Because spontaneous recovery occurs in a meaningful fraction of patients, with reported remission rates for idiopathic unilateral paralysis ranging from thirty to sixty-nine percent and most evidence clustering near the lower end, guidelines generally recommend deferring definitive procedures such as injection glottoplasty or type I thyroplasty for at least six and ideally up to twelve months. Prolonged denervation, however, causes progressive atrophy of the intrinsic laryngeal muscles that can compromise eventual functional outcomes, and significant aspiration or threatened airway protection may justify earlier temporary augmentation. Currently, no diagnostic marker reliably distinguishes patients who will recover spontaneously from those who will need surgery, forcing clinicians to balance the window for neural recovery against the risk of irreversible muscular deterioration on a case-by-case basis.

The authors are careful to frame the study as a measure of safety rather than efficacy. The ACS-NSQIP database captures only thirty days of follow-up, so long-term outcomes such as sustained voice quality, swallowing function, and airway stability fall outside its scope. Nor does the registry provide granular detail on specific techniques, primary versus revision procedures, or the underlying etiology of paralysis, and the binary structure of its outcome variables may underrepresent subtler morbidities like persistent dysphonia or delayed aspiration recovery. Because the database largely reflects North American practice, the findings may not generalize fully to international settings. Nevertheless, by transcending the single-center biases that have limited prior work, the analysis establishes a dependable benchmark: thirty-day morbidity after vocal fold paralysis surgery is low, comparable between unilateral and bilateral disease, and low enough to reassure both surgeons and the patients they counsel.

Subject of Research: Thirty-day perioperative safety of surgical intervention for unilateral and bilateral vocal fold paralysis in a multicenter ACS-NSQIP cohort

Article Title: Thirty-day perioperative safety following surgical intervention for unilateral and bilateral vocal fold paralysis: a multicenter ACS-NSQIP analysis

Article References: Schaschinger, T., Hoch, C. C., Knoedler, L., Niederegger, T., Dyhr, W. J., Hundeshagen, G., Lellouch, A. G., Voss, L. J., & Voss, J. O. (2026). Thirty-day perioperative safety following surgical intervention for unilateral and bilateral vocal fold paralysis: a multicenter ACS-NSQIP analysis. BMC Plastic and Reconstructive Surgery, 2(1), Article 26. https://doi.org/10.1186/s44452-026-00039-3

Image Credits: AI Generated

DOI: 10.1186/s44452-026-00039-3

Keywords: vocal fold paralysis, ACS-NSQIP, perioperative safety, phonosurgery, thyroplasty, injection laryngoplasty, laryngeal reinnervation, bilateral vocal fold paralysis, unilateral vocal fold paralysis, surgical complications, otolaryngology, medialization