Comparative Efficacy of UPPP with Transpalatal Advancement Pharyngoplasty versus UPPP with Barbed Repositioning Pharyngoplasty

Technical Summary: Comparative Efficacy of UPPP with Transpalatal Advancement Pharyngoplasty versus UPPP with Barbed Repositioning Pharyngoplasty

Problem Statement
Obstructive Sleep Apnea (OSA) is characterized by recurrent upper airway collapse, primarily at the palatopharynx, leading to significant morbidity. While Uvulopalatopharyngoplasty (UPPP) is the standard surgical intervention, its efficacy is unstable, with success rates varying widely (24%–77%) depending on obstruction location and severity. To address posterior palatal collapse, two advanced techniques have emerged: Barbed Repositioning Pharyngoplasty (BRP), which utilizes soft tissue suspension to stabilize the soft palate and lateral walls, and Transpalatal Advancement Pharyngoplasty (TPAP), which involves bony resection of the posterior hard palate to anteriorly advance the soft palate, thereby enlarging the retropalatal space. Despite both being superior to conventional UPPP, there is a lack of direct prospective comparison regarding their relative efficacy and the specific preoperative anatomical or physiological factors that predict success for each procedure.

Methodology
This single-center, prospective cohort study enrolled patients diagnosed with OSA who underwent combined H-UPPP (Modified Uvulopalatopharyngoplasty) with either BRP or TPAP at Peking University Shenzhen Hospital between October 2022 and April 2025.

• Participants: The study analyzed 41 patients: 31 in the BRP group and 10 in the TPAP group. Inclusion criteria included ages 18–50, BMI <35, and failure or unwillingness to undergo CPAP therapy. Patients with severe comorbidities or obesity hypoventilation syndrome were excluded.
• Preoperative Assessment: Comprehensive data collection included polysomnography (PSG), upper airway CT scans (measuring mandible-hyoid distance, airway length, hard palate anteroposterior diameter, soft palate angle), cephalometric analysis (ANB angle), and scoring systems (Friedman staging, TCM score, Snoring score).
• Surgical Intervention: All procedures were performed under general anesthesia by a single surgeon. The BRP group received soft tissue suspension using barbed sutures, while the TPAP group underwent posterior hard palate resection with anterior advancement of the soft palate.
• Outcomes: Primary outcomes were measured at 4–6 months post-surgery. Surgical success was defined as a ≥50% reduction in Apnea-Hypopnea Index (AHI) to <20 events/hour and an increase in minimum oxygen saturation (LSaO₂) of ≥3%. Secondary outcomes included changes in CT90, mean apnea duration, snoring scores, and postoperative pain (Visual Analogue Scale).
• Statistical Analysis: The study utilized t-tests, chi-square tests, and binary logistic regression to compare groups and identify predictive factors.

Key Results

• Efficacy: Both surgical combinations significantly improved sleep parameters compared to preoperative baselines. However, the TPAP group demonstrated a higher surgical success rate (70%) compared to the BRP group (52%).
• Physiological Improvements: The TPAP group showed a more pronounced reduction in postoperative AHI (12.16 vs. 20.71 events/h) compared to the BRP group. While both groups improved in minimum oxygen saturation, the TPAP group exhibited a trend toward higher postoperative saturation levels, transitioning patients from severe to mild hypoxemia, whereas the BRP group transitioned from severe to moderate hypoxemia.
• Postoperative Pain: The TPAP group reported significantly lower postoperative pain scores (VAS 4.50) compared to the BRP group (VAS 6.10).
• Predictive Factors:
  • BRP: Success was significantly associated with a lower TCM score (an integrated score of tonsil size, mandible-hyoid distance, and CT90).
  • TPAP: Success was predicted by a shorter mandible-hyoid (MH) distance, shorter airway length, and a smaller soft palate angle.
  • Comparative Analysis: Logistic regression indicated that a larger hard palate anteroposterior diameter and a larger soft palate angle were independent negative predictors for surgical success in both groups, but these factors were significantly more prevalent in the BRP-effective group compared to the TPAP-effective group. Specifically, patients with narrower hard palate diameters and smaller soft palate angles benefited more from TPAP.

Significance and Claims
The authors claim that this study provides the first direct prospective comparison between BRP and TPAP combined with H-UPPP. The study establishes that while both procedures effectively treat retropalatal collapse, TPAP offers superior outcomes in terms of AHI reduction, oxygenation recovery, and postoperative pain management.

The paper posits that the choice of surgery should be guided by preoperative anatomical and physiological profiling:

1. Patient Selection: Patients with lower TCM scores are better candidates for BRP (soft tissue suspension). Conversely, patients with specific anatomical features—specifically shorter MH distances, shorter airway lengths, smaller soft palate angles, and narrower hard palate anteroposterior diameters—are better suited for TPAP (bony remodeling).
2. Mechanistic Insight: The superior efficacy of TPAP in this cohort is attributed to its ability to permanently expand the retropalatal space by modifying the bony framework and altering muscle attachment sites, potentially offering better stability than soft tissue suspension alone.
3. Clinical Application: The integration of TCM scoring with upper airway CT measurements enables a stratified, individualized surgical planning strategy to reduce operation failure rates.

The authors conclude that while their findings support a tailored approach, the limited sample size of the TPAP group (n=10) necessitates further large-scale studies to validate these predictive models and refine patient selection criteria.