Background::Postoperative pneumocephalus is associated with a higher risk of recurrence of chronic subdural hematoma (cSDH). However, there is no verified simple way to measure the pneumocephalus volume at the bedside for daily clinical use. The ABC/2 method was shown to be a simple and reliable technique to estimate volumes of intracranial lesions, such as intracranial hematomas. This study aims to evaluate the accuracy of the ABC/2 formula in estimating volumes of pneumocephalus, as compared to the gold standard with computer-assisted volumetric analysis.Methods::A total of 141 postoperative computed tomographic (CT) brain scans of cSDH patients with burr-hole drainage were analysed. Pneumocephalus volume was measured independently by both the ABC/2 formula and the computer-assisted volumetric measurement. For the computer-assisted measurement, the volume of the air was semiautomatically segmented and calculated by computer software. Linear regression was used to determine the correlation between the ABC/2 method and computer-assisted measurement.Results::The postoperative pneumocephalus volume after bilateral burr-hole drainage was significantly larger than that of unilateral burr-hole drainage (29.34 ml versus 12.21 ml, p < 0.001). The estimated volumes by the formula ABC/2 significantly correlated to the volumes as measured by the computer-assisted volumetric technique, with r = 0.992 ( p < 0.001). The Pearson correlation coefficient is very close to 1, which signifies a very strong positive correlation, and it is statistically significant. Conclusions::An excellent correlation is observed between the ABC/2 method and the computer-assisted measurement. This study verified that the ABC/2 method is an accurate and simple "bedside" technique to estimate pneumocephalus volume.

ABC/2;Chronic subdural haematoma;Burr-hole;Pneumocephalus

Chan David Yuen Chung;Cheung Eric Yuk Hong;Hui Ka Ho;Leung Cecelia Mei Sze;Ng Stephanie Chi Ping;Mak Wai Kit;Wong George Kwok Chu;Chan Tat Ming Danny;Poon Wai Sang

Division of Neurosurgery, Department of Surgery, Faculty of Medicine, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, SAR, China

中华神经外科杂志（英文）

[1]Chan David Yuen Chung;Cheung Eric Yuk Hong;Hui Ka Ho;Leung Cecelia Mei Sze;Ng Stephanie Chi Ping;Mak Wai Kit;Wong George Kwok Chu;Chan Tat Ming Danny;Poon Wai Sang-.ABC/2 formula for "bedside" postoperative pneumocephalus volume measurement)[J].中华神经外科杂志（英文）,2022(04):284-291

cSDH,Pneumocephalus,semiautomatically,haematoma

ABC,formula,bedside,postoperative,pneumocephalus,measurement,Background,Postoperative,associated,higher,risk,recurrence,chronic,subdural,However,there,no,verified,simple,way,daily,clinical,method,was,shown,reliable,technique,volumes,intracranial,lesions,such,hematomas,This,study,aims,evaluate,accuracy,estimating,compared,gold,standard,computer,assisted,volumetric,analysis,Methods,total,computed,tomographic,brain,scans,patients,burr,hole,drainage,were,analysed,measured,independently,by,both,For,air,segmented,calculated,software,Linear,regression,used,determine,correlation,between,Results,after,bilateral,significantly,larger,than,that,unilateral,ml,versus,estimated,correlated,coefficient,very,close,which,signifies,strong,positive,statistically,Conclusions,An,excellent,observed,accurate,Chronic,Burr

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