• L Witthayapraphakorn, A Khositseth, T Jiraviwatana, S Siripornpitak, R Pornkul, N Anantasit, and J Vaewpanich.
• Department of Pediatrics and *Department of Radiology, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand. Correspondence to: Dr Anant Khositseth, 270 Rama VI Road, Ratchathewi, Bangkok 10400, Thailand. anant.kho@mahidol.ac.th.
• Indian Pediatr. 2013 Aug 1;50(8):749-52.

DesignObservational study.SettingTertiary University Hospital.Participants/PatientsPatients, aged 6 days to 19 years, who underwent contrast enhancement computerized tomography imaging of the thorax (CT-thorax).Main Outcome MeasuresWe measured three lengths consisting of length A in axial plane at the level of the lower border of the 6th C-spine from the skin to RIJV at its mid lumen, length B and C in sagittal plane from the RIJV at the level of the lower of the 6th C-spine to the superior vena cava (SVC) at carina and from carina to SVC-right atrium junction, respectively. Lengths A plus B represented the length of CVC where the tip was expected in the SVC at carina (CVC(carina)). Lengths A plus B and C represented the length of CVC when the tip was expected in the SVC at SVC-right atrium junction (CVC(SVC-RA)).ResultsOne hundred and sixty-five cases with mean age of 8.1 ± 4.7 years were reviewed. The CVC(SVC-RA) and CVC carina were significantly correlated with age and body surface area (BSA). Using multiple regression analysis, CVC(SVC-RA) (cm) was equal to 6.4 + 2.8[BSA (m2)] + 0.022[age (month)] and CVC(casina) (cm) equal to 4.9 +2.7[BSA (m2)] +0.013[age (month)] (Adjusted R-squared 0.7275, 0.7140).ConclusionsWe recommended the appropriate CVC length via RIJV approach should be between these two calculated lengths and the CVC length in each age according to the BSA.

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