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Iodine absorption in patients undergoing ERCP compared with coronary angiography
Gastrointestinal Endoscopy
|July 1, 1999
Summary
Systemic absorption of iodine contrast during ERCP is significantly less than with coronary angiography. Routine thyroid hormone monitoring is not recommended after ERCP due to minimal iodine load.
Area of Science:
- Radiology
- Endocrinology
- Internal Medicine
Background:
- Iodinated contrast material is absorbed systemically during Endoscopic Retrograde Cholangiopancreatography (ERCP).
- The clinical significance of this iodine absorption is not well-established.
Purpose of the Study:
- To quantify the systemic iodine load from ERCP.
- To compare iodine load from ERCP with that from coronary angiography.
- To assess the impact of ERCP on thyroid hormone levels.
Main Methods:
- Measured urinary iodine excretion before and after ERCP (n=12) and coronary angiography (n=20).
- Assessed thyroid hormone levels at baseline, 6 weeks, and 24 weeks post-procedure.
Main Results:
- Iodine excretion significantly increased after both procedures.
- ERCP resulted in a peak iodine excretion of 5.3 x 10^5 micromol/mol, substantially lower than coronary angiography (8.65 x 10^5 micromol/mol).
- Thyroid function remained stable after ERCP, with no suppressed thyrotropin, unlike two patients post-coronary angiography.
Conclusions:
- The iodine load from ERCP is approximately 0.6% of that from coronary angiography.
- Routine thyroid hormone measurement before ERCP is not clinically indicated.
- The risk of thyroid dysfunction from ERCP-related iodine load is minimal.