Abstract
Purpose
To report the retro-sternal space hydrodissection technique used to displace the heart and the pericardium posteriorly for thermoprotection ahead of sternal cryoablation (CA).
Methods and materials
Between May 2015 and March 2020, hydrodissection of the retro-sternal space was performed in 5 consecutive patients (5 female; mean age 55.2 ± 9.3 years, range 41–65) who underwent percutaneous image-guided cryoablation of the sternum. The number of needles required, the implemented approach, volume of injectate to achieve hydrodissection, hydrodissection procedure time, distance between the lesion and the pericardium before and after hydrodissection, distance between the ice-ball and the pericardium, technical success and complications were retrospectively assessed.
Results
Technical success, defined as the completion of a full dual freeze protocol without contact between the ice-ball and the pericardium, was achieved in all cases (5/5, 100%). One to two needles were used to perform hydrodissection via a perpendicular (3/5) or an anterior oblique approach (2/5) and a mean hydrodissection procedure time of 10.4 ± 2.6 min (range 8–14). Minimum distance between the lesion and the pericardium increased from mean 5.8 ± 3.8 mm (range 0–10) before hydrodissection to a mean 22.2 ± 5.8 mm (range 18–32) after, with a mean distance between the final ice-ball and the pericardium of 11.6 ± 8.7 mm (range 7–27). A mean of 198 ± 79.8 mL (range 90–290) of iodinated contrast was injected. There were no immediate, short- or medium-term complication noted.
Conclusion
Hydrodissection of the retro-sternal space is a feasible technique for sternal cryoablation in order to protect the pericardium from freezing for sternal cryoablation.
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Julien Garnon, MD: Proctor, Galil Medical Ltd. Afshin Gangi, MD, PhD: Proctor, Galil Medical Ltd. Other authors declare that they have no conflict of interest.
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Autrusseau, PA., Garnon, J., Auloge, P. et al. Hydrodissection of the Retro-Sternal Space to Protect the Pericardium During Sternal Cryoablation. Cardiovasc Intervent Radiol 43, 1371–1377 (2020). https://doi.org/10.1007/s00270-020-02587-2
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DOI: https://doi.org/10.1007/s00270-020-02587-2