Related Experiment Video

Updated: Oct 4, 2025

High-Resolution Cardiac Positron Emission Tomography/Computed Tomography for Small Animals
11:09

High-Resolution Cardiac Positron Emission Tomography/Computed Tomography for Small Animals

Published on: December 16, 2022

3.9K

Enhanced quantitative method for the diagnosis of grade 1 cardiac amyloidosis in 99mTc-DPD scintigraphy

María Del Carmen Mallón Araujo1, Estephany Abou Jokh Casas2, Charigan Abou Jokh Casas3

  • 1University of Santiago de Compostela, Santiago de Compostela, Spain.

Scientific Reports
|February 3, 2022
PubMed

Insights

Optimizing the quantitative method for 99mTc-DPD scintigraphy improves cardiac amyloidosis diagnosis. Adjusting the cut-off value enhances sensitivity and specificity for transthyretin CA identification.

Area of Science:

  • Nuclear Medicine
  • Cardiology
  • Radiology

Background:

  • 99mTc-DPD scintigraphy is crucial for diagnosing cardiac amyloidosis (CA).
  • Current visual scoring methods lack standardized cut-offs and suffer from inter-observer variability, leading to missed diagnoses.
  • Quantitative analysis offers potential for improved accuracy but requires optimization.

Purpose of the Study:

  • To enhance the diagnostic productivity of 99mTc-DPD scintigraphy for CA.
  • To reclassify inconclusive cases and reduce inter-observer variability using an improved quantitative method.
  • To optimize the cut-off value for better sensitivity and specificity in CA detection.

Main Methods:

  • Retrospective analysis of 170 patients with suspected CA.
  • Application of a visual scoring method to classify patients.
  • Development and application of an enhanced quantitative method with adjusted cut-off values.

Main Results:

  • Visual scoring identified 81 cases of transthyretin CA (TTR-CA) and 9 of light-chain CA (LC-CA).
  • The enhanced quantitative method reclassified 19 patients with grade 1 uptake, with some moving to grade 0, 2, or 3.
  • Adjusting the quantitative cut-off to 1.3 reclassified 4 inconclusive patients as TTR-CA, increasing sensitivity to 94% without compromising specificity.

Conclusions:

  • The optimized quantitative 99mTc-DPD scintigraphy method improves visual interpretation and reclassifies doubtful cases.
  • A cut-off value of 1.3 enhances diagnostic accuracy for TTR-CA compared to 1.5.
  • This optimized approach increases the diagnostic yield for cardiac amyloidosis, particularly TTR-CA.

More Related Videos

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography08:13

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography

Published on: February 16, 2016

19.7K
Primary Outcome Assessment in a Pig Model of Acute Myocardial Infarction14:19

Primary Outcome Assessment in a Pig Model of Acute Myocardial Infarction

Published on: October 14, 2016

11.7K

Related Concept Videos

Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
36
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
88
Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT01:25

Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT

Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
148
Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET
255