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Contact surface area and its association with outcomes in robotic-assisted partial nephrectomy
Amanda E Kahn1, Ashley M Shumate1, Isabella J Galler1
1Department of Urology, Mayo Clinic, Jacksonville, Florida.
Background:
Renal tumor scoring systems, such as the contact surface area value, aim to assist in predicting outcomes following robotic-assisted partial nephrectomy. The aim of this study is to identify associations between specific postoperative outcomes and the contact surface area of renal masses.
Methods:
We analyzed 332 consecutive robotic-assisted partial nephrectomies and calculated contact surface area for renal tumors with the contact surface area formula (CSA = 2πrd), where π ≈ 3.14, r = greatest tumor radius (cm), and d = greatest tumor depth (cm).
Results:
Higher contact surface area was associated with longer warm ischemia time (P < .001), higher estimated blood loss (P < .001), and longer length of hospital stay (LOS) (P < .001). Higher contact surface area was significantly associated with decreased renal function at 1 day, 1 month, and 6 months following robotic-assisted partial nephrectomy.
Conclusions:
Contact surface area is associated with certain outcomes following robotic-assisted partial nephrectomy and may be a useful predictive tool.
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