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Kidney Transplant II: Surgical Procedure01:26

Kidney Transplant II: Surgical Procedure

Preoperative ManagementThe primary goals of preoperative management in kidney transplantation are to optimize the patient’s metabolic state and prepare them for surgery through diet adjustments, necessary dialysis, and tailored medical treatment. This phase also involves comprehensive infection screening and patient education about the surgical procedure and postoperative care to improve outcomes and adherence.Medical ManagementA comprehensive evaluation is required for both the living donor...

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Changes in renal function following Roux-en-Y gastric bypass: a prospective study.

Jorge L Zelada Getty1, Isam N Hamdallah, Hazem N Shamseddeen

  • 1Department of Surgery, University of California, Davis, 2221 Stockton Boulevard, Cypress Building, Sacramento, CA 95817, USA.

Obesity Surgery
|February 10, 2012
PubMed
Summary
This summary is machine-generated.

Roux-en-Y gastric bypass (RYGB) improves renal function, best measured by glomerular filtration rate (GFR). Post-surgery 24-hour urine creatinine clearance (24 CCL) improvements correlate with weight loss, especially in hypertensive patients.

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Area of Science:

  • Nephrology
  • Bariatric Surgery
  • Metabolic Medicine

Background:

  • Mixed results exist regarding the impact of Roux-en-Y gastric bypass (RYGB) on renal function.
  • A prospective, repeated-measures controlled study was conducted to clarify this impact.
  • The study aimed to identify the optimal method for assessing renal function post-RYGB.

Purpose of the Study:

  • To characterize the changes in renal function following RYGB.
  • To compare different methods of measuring renal function, including estimated glomerular filtration rate (eGFR) and creatinine clearance (CCL).
  • To identify factors correlating with renal function improvement after RYGB.

Main Methods:

  • Prospective, repeated-measures controlled study design.
  • Collection of clinical data, serum creatinine (SC), and 24-hour urine samples pre- and post-RYGB (6 months).
  • Calculation of glomerular filtration rate (GFR) using the Modification of Diet in Renal Disease (MDRD) formula and creatinine clearance (CCL) via 24-hour urine collection (24 CCL) and Cockcroft-Gault (CG) formula.

Main Results:

  • RYGB led to a significant decrease in SC (0.83 to 0.72 mg/dl) and improvement in GFR (91.6 to 104.9 ml/min/1.73 m²).
  • The CG formula significantly overestimated CCL compared to 24 CCL preoperatively.
  • Improvement in 24 CCL correlated with excess weight loss (EWL) and BMI reduction, particularly in hypertensive patients where it also correlated negatively with age.

Conclusions:

  • Renal function demonstrably improves after RYGB, with changes in GFR being the most reliable indicator.
  • The improvement in 24-hour creatinine clearance (24 CCL) post-RYGB is linked to the patient's weight loss success.
  • These findings are especially pronounced in hypertensive patients, highlighting the renal benefits of RYGB in this population.