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Relative Cortical Atrophy Index as a Strong Predictor of Recurrence After Surgery for Chronic Subdural Hematoma
Amin Charehsaz1, Tugberk Vayisoglu1, Zeynep Arzum Uyaniker1
1Department of Neurosurgery, Hacettepe University Faculty of Medicine, Ankara , Turkey.
Insights
The Relative Cortical Atrophy (RCA) Index effectively predicts chronic subdural hematoma (CSDH) recurrence after surgery. A higher preoperative RCA Index indicates a greater risk, aiding in surgical planning and management.
Area of Science:
- Neurosurgery
- Radiology
- Medical Imaging Analysis
Background:
- Chronic subdural hematoma (CSDH) poses significant neurosurgical challenges, with recurrence being a key postoperative concern.
- Predicting CSDH recurrence is crucial for optimizing patient management and surgical outcomes.
Purpose of the Study:
- To evaluate the Relative Cortical Atrophy (RCA) Index as a predictor of recurrence following surgical evacuation of CSDH.
- To assess the correlation of the RCA Index with patient demographics, hematoma characteristics, and CSDH recurrence.
Main Methods:
- Retrospective analysis of 98 patients undergoing unilateral CSDH evacuation.
- Calculation of the RCA Index from pre- and postoperative cranial imaging.
- Correlation and regression analyses to determine the predictive power of the RCA Index for CSDH recurrence.
Main Results:
- A higher preoperative RCA Index was significantly associated with CSDH recurrence (P < .001).
- The RCA Index demonstrated excellent inter-rater reliability (ICC: 0.998).
- A cutoff RCA Index of 0.165 predicted recurrence with high sensitivity (95.6%) and specificity (93.3%).
Conclusions:
- The RCA Index is a simple and reliable predictor of CSDH recurrence.
- Integrating the RCA Index into preoperative assessments can improve surgical planning and postoperative management.
- Utilizing the RCA Index may help reduce CSDH recurrence rates.
Background And Objectives:
Chronic subdural hematoma (CSDH) presents significant management challenges in neurosurgical practice, with recurrence being a notable postoperative consideration. This study aimed to evaluate the Relative Cortical Atrophy (RCA) Index as a predictor of recurrence after CSDH surgery.
Methods:
A retrospective analysis was conducted on 98 patients who underwent surgical evacuation for unilateral CSDH. The RCA Index was calculated using pre- and postoperative cranial imaging, correlating it with patient demographics, hematoma characteristics, and recurrence. Inter-rater reliability among measurements by 4 independent physicians was assessed using the intraclass correlation coefficient (ICC). Correlation and regression analyses were performed to identify the correlation of the RCA Index with other factors and their potential predicting power of CSDH recurrence, respectively.
Results:
The study population had a mean age of 74.1 (11.9) years, with a 23.5% (23 patients) recurrence rate of CSDH. The ICC analysis showed excellent inter-rater reliability for RCA Index measurements (ICC: 0.998, 95% CI: 0.997-0.998, P < .001). A higher preoperative RCA Index was significantly associated with recurrence (0.215 [0.031] in the recurrent group vs 0.125 [0.034] in the nonrecurrent group, P < .001). The preoperative RCA Index highly correlated with the postoperative RCA Index (Pearson's correlation: 0.918, P < .001), and there was only a small (average: 0.005) but significant increase in the RCA Index of the unaffected hemisphere after surgery ( P = .01).The preoperative RCA Index positively correlated with age, preoperative SDH thickness and volume, and recurrence. A RCA Index cutoff value of 0.165 predicted CSDH recurrence with high sensitivity (95.6%) and specificity (93.3%) (area under the curve = 0.97, 95% CI: 0.93-1).
Conclusion:
The RCA Index is a simple yet robust predictor of CSDH recurrence. Incorporating this measure into the preoperative assessment may enhance surgical planning and postoperative management, potentially reducing recurrence rates.
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