Radiolabeled fibronectin for the scintigraphic detection of pulmonary emboli in dogs.

Plasma fibronectin, a glycoprotein that is a component of blood thrombi, was evaluated for the in vivo scintigraphic detection of pulmonary emboli in dogs. Fibronectin (canine or human) was labeled with either 131I or with 111In and diethylenetriaminepenta-acetic acid (DTPA) as the bifunctional chelating agent using a modification of the mixed anhydride method. The radiolabeled proteins were administered intravenously 20 to 30 minutes after the embolization of a 99mTc-labeled thrombus.

The detection of pulmonary emboli by magnetic resonance imaging. Evaluation of imaging parameters.

The authors studied the influence of gating, cardiac cycle, and timing of rephasing gradients upon the detection of pulmonary emboli by MRI. Serial single-section MR images were obtained in normal dogs and dogs with experimental pulmonary emboli. Images with cardiac gating, respiratory gating, and ungated images were obtained.

Coumadin and 111In-labeled platelet uptake on experimental thrombi in dogs. Preliminary observations.

The effect of coumadin treatment upon the uptake of 111In platelets (111In-P) in dogs by experimental jugular thrombi and intravascular catheters was studied. Coumadin, in doses sufficient to raise the PT to the "therapeutic" range, did not impair scintigraphic visualization of thrombi on images obtained 4 hours after 111In-P injection. In addition, there was no obvious effect upon postmortem measurements of thrombus:blood or catheter:blood 111In activity ratios, consistent with the imaging data.

The influence of heparin on the in vivo distribution of IN-111 labeled platelets.

We investigated the influence of heparin (H) (bolus i.v.; 100-200 I.