Radiation Oncology Journal

The Korean Society for Radiation Oncology (대한방사선종양학회)
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Bladder filling variations during concurrent chemotherapy and pelvic radiotherapy in rectal cancer patients: early experience of bladder volume assessment using ultrasound scanner

  • Chang, Jee Suk (Department of Radiation Oncology, Yonsei University College of Medicine) ;
  • Yoon, Hong In (Department of Radiation Oncology, Yonsei University College of Medicine) ;
  • Cha, Hye Jung (Department of Radiation Oncology, Yonsei University College of Medicine) ;
  • Chung, Yoonsun (Department of Radiation Oncology, Yonsei University College of Medicine) ;
  • Cho, Yeona (Department of Radiation Oncology, Yonsei University College of Medicine) ;
  • Keum, Ki Chang (Department of Radiation Oncology, Yonsei University College of Medicine) ;
  • Koom, Woong Sub (Department of Radiation Oncology, Yonsei University College of Medicine)
  • Received : 2013.01.22
  • Accepted : 2013.02.26
  • Published : 2013.03.31
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Abstract

Purpose: To describe the early experience of analyzing variations and time trends in bladder volume of the rectal cancer patients who received bladder ultrasound scan. Materials and Methods: We identified 20 consecutive rectal cancer patients who received whole pelvic radiotherapy (RT) and bladder ultrasound scan between February and April 2012. Before simulation and during the entire course of treatment, patients were scanned with portable automated ultrasonic bladder scanner, 5 times consecutively, and the median value was reported. Then a radiation oncologist contoured the bladder inner wall shown on simulation computed tomography (CT) and calculated its volume. Results: Before simulation, the median bladder volume measured using simulation CT and bladder ultrasound scan was 427 mL (range, 74 to 1,172 mL) and 417 mL (range, 147 to 1,245 mL), respectively. There was strong linear correlation (R = 0.93, p < 0.001) between the two results. During the course of treatment, there were wide variations in the bladder volume and every time, measurements were below the baseline with statistical significance (12/16). At 6 weeks after RT, the median volume was reduced by 59.3% to 175 mL. Compared to the baseline, bladder volume was reduced by 38% or 161 mL on average every week for 6 weeks. Conclusion: To our knowledge, this study is the first to prove that there are bladder volume variations and a reduction in bladder volume in rectal cancer patients. Moreover, our results will serve as the basis for implementation of bladder training to patients receiving RT with full bladder.

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References

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