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Polish cross-cultural adaptation of the Glasgow Benefit Inventory as an instrument for the post-intervention measurement of change after Gamma Knife treatment

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Bieńkowska K., Kostecka B., Ząbek M., Kokoszka A., Dzierzęcki S., Cichoń E., Turek G.

Polish Journal of Otolaryngology

2024

vol. 78

issue 4

39-48

Introduction: The Glasgow Benefit Inventory (GBI) is one of questionnaires for the measurement of treatment success, which is widely used in patients after vestibular schwannoma treatment. Aim: This study aimed to adapt the GBI originally written in English to Polish conditions and to evaluate its psychometric properties. Material and methods: The Polish version of the GBI used in this study was prepared by a bilingual translator, and its accuracy was ensured by back-translation. To identify the structure of the Polish version of the GBI, exploratory factor analysis was performed. The reliability was determined using Cronbach’s α. To verify the validity, correlation analysis was conducted between the domains of GBI and other questionnaires. Results: The results of confirmatory factor analysis indicated that the original 3-factor model is not a good fit for the data. The exploratory factor analysis was performed and identified 4 factors. The total variance of the 4-factor solution was 66.25%. The Cronbach’s α calculated for the total GBI reached 0.91. Our analysis confirmed significant weak or moderate correlations between tools for the measurement of general QoL (AQoL-8D: r = 0.411; p = 0.000) and health-related QoL (PANQOL: r = 0.367; p = 0.000; a tool dedicated for patients with VS), well-being (WHO-5: r = 0.432; p = 0.000), hearing and tinnitus (STS: r = –0.217; p = 0.016). Conclusions: This study reports the first adaptation of the GBI for patients with VS to Polish conditions. The results demonstrated that the Polish version of the GBI is a reliable and valid questionnaire that can be used to measure treatment success.

Subtotal resection of vestibular schwannoma with subsequent Gamma Knife irradiation – tumor growth control, facial and cochlear nerve outcome – preliminary results

84%

Turek G., Drożdż A., Dzierzęcki S., Dżaman K., Gruda M., Zielińska-Turek J., Gajewski J., Bodzak D., Ząbek M.

Polish Journal of Otolaryngology

2024

vol. 78

issue 4

7-15

Introduction: The choice of treatment of vestibular schwannoma (VS) depends on several factors, including the tumor size, the patient’s age and overall health, and the presence and severity of symptoms. Aim: The aim of the study was to assess the effectiveness of intentional subtotal resection (STR) of tumor followed by Gamma Knife surgery (GKS) in patients with larger VS (Koos 3 and 4). Materials and methods: The retrospective analysis was performed on 18 patients. Data of VS volumes measured in MRI, the facial nerve function assessed in the House-Brackmann scoring system (HB), and the results of audiological examination expressed on the Gardner-Robertson scale (GR) were collected preoperatively, postoperatively, and post-GKS. Results: Preoperatively, the main symptom was hearing loss observed in 13 out of 18 patients. The facial nerve function was assessed as HB 1 in 16, whereas HB 2 in 2 patients. The mean volume of the tumor in the initial MRI amounted to 16.81 cm3 . Postoperatively, the facial nerve was assessed as HB 1 or 2 in 16, whereas HB 3 in 2 patients. Serviceable hearing was presented by only 4 persons. The Mean diameter of the tumor after subtotal surgery amounted to 3.16 cm3 , 1.83 cm3 after GKS, and 1.58 cm3 at the last follow-up. The facial nerve function and hearing level remained the same as before GKS in all patients. Conclusions: STR followed by GKS can be a safe and effective method of treatment of large VS concerning the functional outcome of the facial nerve and the tumor volume growth control.

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2 Polish Journal of Otolaryngology

2 2024

2 Dzierzęcki S.

2 Turek G.

2 Ząbek M.

1 Bieńkowska K.

1 Bodzak D.

1 Cichoń E.

1 Drożdż A.

1 Dżaman K.

1 Gajewski J.

1 Gruda M.

1 Kokoszka A.

1 Kostecka B.

1 Zielińska-Turek J.

Search results

Polish cross-cultural adaptation of the Glasgow Benefit Inventory as an instrument for the post-intervention measurement of change after Gamma Knife treatment

Subtotal resection of vestibular schwannoma with subsequent Gamma Knife irradiation – tumor growth control, facial and cochlear nerve outcome – preliminary results