Visualisation of the oblique vein of the left atrium (vein of Marshall) using cardiac computed tomography: is the game worth the candle?

BACKGROUND The vein of Marshall (VoM) is a small vessel that descends obliquely on the back of the left atrium and ends in the coronary sinus near the area where the great cardiac vein continues into the coronary sinus. AIM The aim of the study was to examine the frequency of occurrence and anatomical aspects as well as the possibility of visualising the VoM, including an evaluation of the quality of the visualisation, on computed tomography (CT). METHODS Three hundred patients aged 58.8 ± 11.5 years (111 women) were included into this single-centre study. Cardiac CT was performed in all patients. The search for the VoM was performed by two experienced researchers using two- and three-dimensional techniques. A dedicated Likert-based scale was used to evaluate the quality of the visualisations. RESULTS The VoM was found in 61 (20.33%) of 300 patients. Its average diameter was 1.72 ± 0.69 mm with no sex-related differences (men: 1.71 ± 0.69 mm; women: 1.73 ± 0.57 mm; p = 0.91). The average length of the vessel was 9.24 ± 7.58 mm. The VoM was more frequently (p = 0.01) visualised in the systolic phases (68.85% of cases) compared to the diastolic phases (27.86% of cases). Occasionally it was visualised in other phases (3.29%). CONCLUSIONS Although it was possible to visualise the VoM using cardiac CT in about 20% of the population, this method of visualisation requires that special attention be paid to the quality of the images, especially in the systolic phases. Visualisation may be useful before certain electrophysiology procedures.

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