Mapping the Gastrointestinal Quality of Life Index to Short-Form 6D utility scores

Purpose

The Gastrointestinal Quality of Life Index (GIQLI) is a disease-specific quality of life instrument that is commonly used in gastrointestinal disorders. However, no preference weights, which are used to calculate quality-adjusted life years for cost-effectiveness analyses, for this instrument have been assigned. Therefore, the objective of this study was to develop a mapping function to derive utility scores for the GIQLI.

Methods

Patients undergoing elective laparoscopic cholecystectomy completed the short-form 6D (SF-6D), a preference-weighted utility measure, and the GIQLI at baseline and at 1 wk and 1 mo postoperatively. The responsiveness of the SF-6D to expected postoperative changes as well as the correlation between the SF-6D and the GIQLI was investigated. Ordinary least squares regression was performed to derive a mapping function using the baseline values, which was then validated using postoperative values. Adjusted r², mean absolute error, and root mean square error was used to determine model performance.

Results

A total of 50 patients were included in the study (mean age 51.1 [standard deviation 16.8], 28% male). The SF-6D and GIQLI domains were responsive to expected postoperative changes, and there was high correlation between the SF-6D and four of the five GIQLI domains (excluding treatment effects). The final mapping function explained 63% of the variance in the derivation sample but had relatively high mean absolute error (0.075 and 0.067 in the 1-wk and 1-mo samples, respectively) and adjusted root mean square error (13.1% and 12.0% in the 1-wk and 1-mo samples, respectively).

Conclusions

The GIQLI can be accurately mapped to SF-6D preference weights at the group level but may be too inexact at the individual level.     

Using GI-specific patient outcome measures in renal transplant patients: Validation of the GSRS and GIQLI

Introduction: Gastrointestinal (GI) side-effects occur frequently as a result of immunosuppressant regimens used in renal transplant patients. Little effort has been made to quantify the impact of these side-effects on patients’ health-related quality of life and symptom severity. Objective: To assess the psychometric characteristics of two GI-specific outcome instruments (the Gastrointestinal Rating Scale (GSRS) and the Gastrointestinal Quality of Life Index (GIQLI)) for use in post-renal transplant patients. Methods: Cross-sectional study conducted at 5 clinical centers in 4 countries. Patients were required to be on mycophenolate mofetil and a calcineurin inhibitor. Patients completed the GSRS, GIQLI and two generic instruments (the Psychological General Well-Being Index and the EQ-5D) at one timepoint. Reliability, construct and known groups validity were assessed. Results: In general the GSRS and the GIQLI demonstrated Cronbach’s alphas higher than 0.70. The GIQLI was moderately to highly correlated with the PGWB and EQ-5D. Correlations among the GSRS and generic instruments were slightly lower. The GSRS and GIQLI both distinguished between patients with and without GI complaints (all p<0.05). Conclusions: The GSRS and the GIQLI are appropriate for use in a post-renal transplant population. Scores on both instruments demonstrated significant differences between renal transplant patients with GI complications and without GI complications.     

Responsiveness and Minimal Clinically Important Differences after Cholecystectomy: GIQLI Versus SF-36

Introduction  To compare responsiveness and minimal clinically important differences (MCID) between the Gastrointestinal Quality of Life (GIQLI) and the Short Form 36 (SF-36), we prospectively analyze 159 patients undergoing cholecystectomy at two tertiary academic hospitals. Patients and Methods  All patients completed the disease-specific GIQLI and the generic SF-36 before and 3 months after surgery. Scores using these instruments were interpreted by generalized estimating equation before and after cholecystectomy. The bootstrap estimation was used to derive 95% confidence intervals for differences in the responsiveness estimates. Results and Discussion  Mean changes in all GIQLI and the SF-36 subscales were statistically significant (p < 0.05). Comparisons of effect size (ES), standardized response means (SRM), and relative efficiency (>1) indicated that the responsiveness of the GIQLI was superior to that of the SF-36. In the equivalence test, all lower or upper confidence limits presented no equivalence (>5), indicating good MCID. The ES and SRM for emotions and physical function in the GIQLI significantly differed from those of the SF-36 (p < 0.05). Conclusion  The data in this study indicate that clinicians and health researchers should weight disease-specific measures more heavily than generic measures when evaluating treatment outcomes.     

结肠慢传输型便秘的外科治疗

目的 评价慢传输型便秘的不同手术方式--回肠直肠吻合(IRA),回肠乙状结肠吻合(ISA)和保留回盲瓣的盲肠直肠吻合(CRA)的治疗效果.方法 回顾性分析近5年手术治疗的45例慢传输型便秘手术方式及术后效果,采用Wexner便秘评分评估术后便秘复发情况;采用Vaizey评分评估术后便失禁情况;采用GIQLI评估术后生活质量.结果 ISA和CRA两种术式的便秘复发率没有明显差异,但明显大于IRA,CRA的Wexner评分最高,ISA和CRA评分的差异没有显著性;而IRA和ISA的便失禁几率没有统计学上的差异,但要大于CRA,3种术式之间的Vaizey评分有显著差异;3种术式的GIQLI较术前有了显著提高,相互之间的差异没有统计学意义. 结论 IRA,ISA和CRA的术后远期效果都较满意,但是IRA便失禁的风险随着时间的增加而逐渐降低,而且其便秘复发的风险最小.     

Gastrointestinal quality of life before and short- and long-term after Roux-en-Y gastric bypass for severe obesity

BackgroundOverall quality of life (QoL) is generally improved after bariatric surgery. Gastrointestinal (GI) symptoms including abdominal pain have been reported in up to >30% of patients after Roux-en-Y gastric bypass (RYGB), and may negatively influence QoL, especially GI-QoL.ObjectivesTo evaluate the evolution of GI symptoms and GI-QoL short- and long-term after RYGB.SettingTwo public hospitalsMethodsCandidates for bariatric surgery (n = 128, BMI = 44.2 ± 7.4) or patients who had undergone RYGB 2–4 years (n = 161, BMI = 29.3 ± 15.9) and 5–10 years (n = 121, BMI = 31.3 ± 6.5) before were invited to complete a questionnaire combining 3 validated questionnaires (GIQLI, GSRS, and PCS) specifically designed to evaluate GI-QoL. Scores were compared between the preoperative, early, and late postoperative periods.ResultsThe GIQLI score improved from 88.1 before surgery to 118.6 (P < .0001) and 109.7 (P < .0001) in the early and late postoperative periods respectively. GSRS score improved from 15.6 to 10.1 (P = .0001) and 12.8 (P = .012), and PCS-score improved from 19 to 4.5 (P = .0001) and 8.3 (P = .0001), respectively. The GI subscore of the GIQLI improved from 57.4 to 62.1 (P = .007) in the early period but was not significantly different in the late period (59.3 versus 57.4, P = .3). The psychological impact of GI symptoms decreased at both postoperative time points.ConclusionGI-QoL is markedly improved after RYGB, and this improvement persists up to 10 years. GI symptoms decrease early after surgery and do not worsen in the longer term. Their psychological impact is markedly reduced.     

Haplotypes of the IL-1 gene cluster are associated with gastroesophageal reflux disease and Barrett’s esophagus

Objectives

Gastroesophageal reflux (GERD) is a one of the major public health problem that can lead to reflux esophagitis (RE), Barrett’s esophagus (BE), and esophageal adenocarcinoma (EAC). The aim of our study was to determine the impact of IL-1 gene polymorphisms on the development of GERD, RE and BE.

Methods

Three hundred and thirty-three Czech patients with gastroesophageal reflux and 165 healthy controls were included in this case-control study. Four polymorphisms in the genes of the IL-1 cluster [IL-1A(-889C/T), IL-1B(−511C/T), IL-1B(+3953C/T), and IL-1RN(VNTR)] were analyzed.

Results

Significant differences were found in IL-1RN 1/2 genotype between patients with GERD/RE and controls and in IL-1B+3953 T allele between patients with BE and healthy subjects. In addition, complex analysis revealed differences in IL-1 haplotype frequencies between the groups. Specifically, the haplotype TCCL was significantly more frequent (p = 0.016) in GERD patients than in controls and the haplotype CCCL more frequent (p = 0.008) in RE patients than in controls. However, in patients with BE, frequency of haplotype TCTL was lower (p = 0.05) and haplotypes CTCL and TCCL were higher (p = 0.03 and p = 0.02) in comparison with the controls.

Conclusions

Our results suggest that IL-1 haplotypes may be associated with susceptibility to GERD, RE and BE.     

Comparison between a general and a disease-specific health-related quality-of-life questionnaire in patients after pancreatic surgery

Background/Purpose The aim of this study was to compare the short-form (SF-) 36 as a general instrument and the gastrointestinal quality of life index (GIQLI) as a disease-specific instrument in patients after pancreatic surgery.Methods The questionnaires were sent to patients receiving pancreatic surgery over a time period of three years. Patients were compared with a normal population completing the SF-36 or reported normal-population values for the GIQLI. Agreement between the instruments was analyzed using Bland Altman plots.Results A total of 98 patients were included, most of them undergoing a Whipple procedure (86%). The most frequent complaints were meteorism, obstipation, stool urgency, and stress incontinence in 9% of the patients. Whereas in almost every domain of the SF-36 the HRQL was impaired in comparison to the normal population, the GIQLI showed differences in only the domain emotions. Neither the SF-36 nor the GIQLI was different between patients with early and advanced cancer stages. The SF-36 had no agreement with the GIQLI.Conclusions The results of HRQL studies depend on the instruments which were used. Whereas a general instrument may detect factors such as comorbidity more accurately, disease-specific instruments have the advantage of better clinical interpretability.Presented at the 120th Congress of the German Society for Surgery, Munich, May 2003     

Post-cholecystectomy Quality of Life: A Prospective Multicenter Cohort Study of Its Associations with Preoperative Functional Status and Patient Demographics

Purpose  This study analyzed patient demographics and preoperative functional status for associations with post-cholecystectomy quality of life (QOL). Methods  This prospective study analyzed 159 cholecystectomy patients at two tertiary academic hospitals. All patients completed the SF-36 and the gastrointestinal quality of life index (GIQLI) at baseline and at 3 and 6 months postoperatively. The 95% confidence intervals for differences in responsiveness estimates were derived by bootstrap estimation. Scores derived by these instruments were interpreted by generalized estimating equation (GEE) before and after cholecystectomy. Results  The examined population significantly (p < 0.05) improved in both SF-36 subscales and GIQLI subscales. After adjusting for time effects (time, and time²) and baseline predictors, GEE approaches revealed the following explanatory variables for QOL: time, time², age, gender, preoperative GIQLI score, body mass index, and number of comorbidities. Conclusion  The data revealed dramatically improved post-cholecystectomy QOL. However, QOL change was simultaneously associated with preoperative functional status and demographic characteristics.