Lateral Planar Imaging of Tc-pyrophosphate Scintigraphy in Patients with Suspected Transthyretin Cardiac Amyloidosis.

: Lateral planar Tc-pyrophosphate (PYP) imaging is recommended as a standardized acquisition method because it helps separate extracardiac uptake from the myocardium. We evaluated its discriminatory performance in detecting myocardial PYP uptake, using single-photon emission computed tomography (SPECT) as a reference standard. : We retrospectively evaluated 170 patients who underwent PYP imaging for suspected transthyretin cardiac amyloidosis.

Comparison of 1-h with 3-h planar Tc-pyrophosphate scintigraphy in patients with suspected transthyretin cardiac amyloidosis using SPECT as a reference standard.

Objectives: The purpose of this study was to examine the diagnostic value of planar Tc-pyrophosphate (PYP) imaging at 1 and 3 h after tracer administration in patients with suspected transthyretin cardiac amyloidosis (ATTR-CA) using SPECT as a reference standard. We also tested whether blood pool activity of PYP is associated with renal dysfunction.

Methods: PYP images of 109 consecutive patients with suspected ATTR-CA were retrospectively reviewed.