Serial scanning with technetium pyrophosphate (99mTc-PYP) in advanced ATTR cardiac amyloidosis

Adam Castaño*, Albert DeLuca, Richard Weinberg, Ted Pozniakoff, William S. Blaner, Altaf Pirmohamed, Brian Bettencourt, Jared Gollob, Verena Karsten, John A. Vest, Codruta Chiuzan, Mathew S. Maurer, Sabahat Bokhari

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Background: Development of noninvasive imaging modalities to quantify amyloid burden over time is an unmet clinical need. Technetium pyrophosphate (99mTc-PYP) scintigraphy is a simple and widely available radiotracer useful to differentiate transthyretin from light-chain amyloidosis in patients with advanced cardiac amyloidosis. We examined the utility of serial 99mTc-PYP scanning to quantify amyloid burden over time in TTR cardiac amyloidosis (ATTR-CA). Methods and Results: Twenty subjects with ATTR-CA (10 wild type, 10 mutant) underwent serial 99mTc-PYP planar cardiac imaging. Cardiac retention was assessed both semiquantitatively (visual score 0, no uptake to 3, uptake greater than bone) and quantitatively (region of interest drawn over the heart, copied, and mirrored over the contralateral chest) to calculate a heart-to-contralateral (H/CL) ratio. Index scan mean visual score and H/CL were 3.0 ± 0.2 and 1.79 ± 0.2, respectively, and after an average 1.5 ± 0.5 years follow-up, did not differ, 3.0 ± 0.2, P = .33 and 1.76 ± 0.2, P = .44. H/CL change was minimal, 0.03 ± 0.17, did not correlate with time between scans, r = 0.19, P = .43, and was observed despite obvious clinical progression (increase in troponin ≥ 0.1 ng/mL, BNP ≥ 400 pg/mL, NYHA class, and/or death). Conclusions: Serial 99mTc-PYP scanning in subjects with advanced ATTR-CA does not show significant changes over an average 1.5 years of follow-up despite obvious clinical progression.

Original languageEnglish (US)
Pages (from-to)1355-1363
Number of pages9
JournalJournal of Nuclear Cardiology
Volume23
Issue number6
DOIs
StatePublished - Dec 1 2016
Externally publishedYes

Keywords

  • Tc-PYP technetium pyrophosphate imaging
  • AL amyloid
  • ATTR-CA transthyretin cardiac amyloidosis

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

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