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Retention of 2-iododesmethylimipramine (IDMI) in 4 hearts compared with 11-μm diameter microspheres at 4 different times. Although IDMI washes out, the recirculation delivers more tracer IDMI, so that the underestimation of flows from IDMI deposition is only slightly different at 15 min than at 1 min. Each heart was sectioned into 4 ventricular piecesand 1 piece containing the atria and aortic stub. LA, left atrium.
