Phenytoin Could Potentially Increase Hepatic Clearance of 99mTc-Sestamibi in Myocardial Perfusion Imaging

Myocardial perfusion imaging (MPI) is one of the most commonly used nuclear medicine imaging modalities for coronary artery disease evaluation and risk stratification. The authors present incidental image findings in a patient who underwent MPI twice because of development of seizures just before the first SPECT-MPI acquisition. The projection images for first MPI done without medication (phenytoin) showed the retention of hepatic tracer activity. After a few days from restarting of phenytoin, the repeat MPI showed complete hepatic clearance of tracer. This case highlights the possible pharmacokinetic interaction between phenytoin intake and 99mTc-sestamibi, resulting in faster hepatic clearance of the radiotracer.

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