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The Pakistan Palatal Fistula Difficulty Index (PPFDI): Development and Initial Validation of a Novel Scoring Index
Muhammad Daiem1,2, Ghulam Q Fayyaz1, Muhammad Sohail3
1Department of Plastic Surgery, CLAPP Hospital, Lahore, Pakistan.
Insights
A new scoring system, the Pakistan Palatal Fistula Difficulty Index (PPFDI), accurately measures the complexity of palatal fistulae after cleft palate repair. This tool aids surgeons in determining appropriate referral pathways and surgical management.
Area of Science:
- Plastic Surgery
- Craniofacial Surgery
- Surgical Outcomes
Background:
- Palatal fistulae are the most frequent complication after cleft palate repair, with reported incidences varying widely from 2% to 35%.
- Current classification systems inadequately guide surgical decision-making and patient referral for palatal fistulae.
- A need exists for a standardized, objective tool to assess palatal fistula complexity.
Purpose of the Study:
- To develop and validate the Pakistan Palatal Fistula Difficulty Index (PPFDI), a novel scoring system for quantifying palatal fistula complexity.
- To establish a tiered referral framework based on PPFDI scores to guide management decisions.
- To assess the reliability and validity of the PPFDI among expert cleft surgeons.
Main Methods:
- The PPFDI was developed using 6 domains: location, size, configuration, number, recurrence, and velopharyngeal function, each scored on a 3-point scale.
- Content and face validity were confirmed via a modified Delphi process with 30 expert cleft surgeons.
- Inter-rater reliability was evaluated using 30 anonymized case files scored by 4 senior surgeons, with analysis using intraclass correlation coefficients (ICCs).
Main Results:
- The PPFDI demonstrated strong inter-rater reliability (ICC=0.87), with domain-specific ICCs ranging from 0.78 to 0.92.
- A significant proportion of cases (43.3%) were classified as high complexity (PPFDI score ≥12).
- The PPFDI-based referral tier showed excellent agreement (91.7%, Cohen kappa=0.81) with clinician-determined referral needs.
Conclusions:
- The PPFDI provides a reliable and clinically relevant method for stratifying palatal fistula complexity.
- This index can support structured decision-making for palatal fistula management in diverse healthcare settings.
- Further multicenter validation and correlation with surgical outcomes are recommended to establish broader clinical applicability.
Abstract:
Palatal fistulae remain the most common complication following cleft palate repair, with recent studies reporting incidence rates ranging from 2% to 35%. Existing classification systems offer limited guidance on surgical complexity or referral pathways. This study developed and validated the Pakistan Palatal Fistula Difficulty Index (PPFDI), a novel scoring system designed to quantify fistula complexity based on 6 domains: location, size, configuration, number of fistulae, recurrence history, and velopharyngeal function. A 3-tiered framework was proposed to guide referral based on complexity level and surgeon experience. Each domain was scored on a 3-point ordinal scale, yielding a total score range of 6 to 18. Content and face validity were established through a modified Delphi process involving 30 expert cleft surgeons, with all 6 domains achieving ≥70% agreement. Inter-rater reliability was assessed using standardized, anonymized clinical case files (n=30) independently scored by 4 senior cleft surgeons. The PPFDI demonstrated strong inter-rater reliability (ICC=0.87, 95% CI: 0.87-0.95), with domain-specific ICCs ranging from 0.78 to 0.92. The mean PPFDI score was 11.1 (SD=2.9), with 43.3% of cases classified as high complexity (score ≥12). Agreement between PPFDI-informed referral tier and clinician-determined referral need was 91.7% (Cohen kappa=0.81), indicating excellent alignment. The PPFDI offers a reliable and clinically meaningful method to stratify palatal fistula complexity and may support more structured decision-making in both low-resource and high-resource settings. Further validation through multicenter studies and correlation with surgical outcomes is warranted to confirm its broader clinical applicability.
