Application value of delay-phase 99Tc m-PYP scintigraphy and SPECT imaging for diagnosis of transthyretin-related cardiac amyloidosis
10.3760/cma.j.cn321828-20200715-00282
- VernacularTitle:99Tc m-PYP延迟及断层显像诊断转甲状腺素蛋白相关心脏淀粉样变的应用价值
- Author:
Chao REN
1
;
Jingyun REN
;
Yanrong DU
;
Zhuang TIAN
;
Shan HE
;
Xuezhu WANG
;
Zhixin HAO
;
Jie DING
;
Shuyang ZHANG
;
Fang LI
;
Li HUO
Author Information
1. 中国医学科学院、北京协和医学院北京协和医院核医学科、核医学分子靶向诊疗北京市重点实验室、疑难重症及罕见病国家重点实验室（北京协和医院），北京 100730
- Keywords:
Amyloidosis;
Myocardium;
Radionuclide imaging;
Tomography, emission-computed, single-photon;
Technetium Tc 99m pyrophosphate
- From:
Chinese Journal of Nuclear Medicine and Molecular Imaging
2022;42(1):1-6
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the application of different imaging methods of 99Tc m-pyrophosphate (PYP) in the diagnosis and pathological classification of cardiac amyloidosis (CA). Methods:A total of 31 patients (22 males, 9 females, age 21-81(57.2±13.4) years) with suspected CA who underwent 99Tc m-PYP dual-phase scintigraphy (early-phase: 1 h, delay-phase: 2-3 h) and SPECT/CT (1 h) between December 2018 and December 2019 in Peking Union Medical College Hospital were retrospectively included. Taking clinical diagnosis as the standard, the results of visual score (≥2, positive) and semi-quantitative values (heart to contralateral lung (H/CL)≥1.5, positive) of 99Tc m-PYP uptake in dual-phase scintigraphy and SPECT/CT imaging were analyzed. One-way analysis of variance and Bonferroni test were used to analyze the data. Results:Among 31 patients with suspected CA, 15 were clinically diagnosed as CA (5 patients with transthyretin-related CA (ATTR-CA) and 10 patients with light chain CA (AL-CA)) and 16 were diagnosed as non-CA. All 5 patients with ATTR-CA had positive dual-phase scintigraphy and SPECT/CT imaging results. Three out of 10 patients with AL-CA had positive early-phase scintigraphy whereas negative delay-phase scintigraphy and SPECT/CT imaging results. Sixteen patients who were clinically diagnosed as non-CA had negative dual-phase scintigraphy and SPECT/CT imaging results. The sensitivity (5/5), specificity (10/10), positive predictive value (5/5), negative predictive value (10/10) and accuracy (15/15) of delay-phase scintigraphy and SPECT/CT imaging were the same. Among 31 patients, 16 patients carried transthyretin-related (TTR) gene mutation, and 4 of them who clinically diagnosed as variant ATTR (ATTRv) had positive image findings while 12 of them who not clinically diagnosed as CA had negative image findings. There were significant differences in H/CL between ATTR-CA group and AL-CA group in early-phase (2.11±0.24 vs 1.31±0.07) and delay-phase (2.02±0.19 vs 1.30±0.05; F values: 75.41 and 87.15, Bonferroni test, both P<0.01). Conclusions:99Tc m-PYP delay-phase scintigraphy and SPECT/CT have high diagnostic efficiencies in ATTR-CA, helping to determine the pathological classification of CA; while early-phase scintigraphy has false positive results. Moreover, 99Tc m-PYP imaging is helpful to detect CA in patients with TTR gene mutation.
