Podcast # 420: CT Contrast and the Kidneys

Author: Don Stader, MD

Educational Pearls:


  • Recent meta-analysis has demonstrated that there is no significant risk for kidney injury from CT contrast
  • Most kidney injury  seen after contrast CTs were due to other underlying illnesses (sepsis, hypovolemia, etc.)
  • Older contrast agents likely did have nephrotoxic effects but this appears to be a thing of the past



Aycock RD, Westafer LM, Boxen JL, Majlesi N, Schoenfeld EM, Bannuru RR. Acute Kidney Injury After Computed Tomography: A Meta-analysis. Ann Emerg Med. 2018 Jan;71(1):44-53.e4. doi: 10.1016/j.annemergmed.2017.06.041. Epub 2017 Aug 12. Review. PubMed PMID: 28811122.

Summarized by Travis Barlock, MS4 | Edited by Erik Verzemnieks, MD

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Podcast # 365: Renal Trigger Point Injections

Author: Erik Verzemnieks, MD

Educational Pearls:

  • Single study in Japan demonstrated possible effectiveness of renal colic trigger point
  • Patients had injection at the area of maximal tenderness on palpation of the flank
  • Compared to a muscle relaxer, injection of local anesthetic at the trigger point had faster time to pain relief and fewer rescue therapies


Iguchi, M et al. Randomized trial of trigger point injection for renal colic. International Journal of Urology. 2002. 9(9): 475-479