The First Experience With Using a One-dimensional Mathematical Model With Fully Automated Algorithm of Extraction of Patient-specific Geometry From CT Images for a Noninvasive Assessment of Fractional Flow Reserve.
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 31
- 试验地点
- 2
- 主要终点
- Diagnostic Accuracy of FFRct
研究概览
简要总结
This study evaluates the diagnostic efficiency of an automated method of noninvasive assessment of the fractional reserve of coronary blood flow.
Fractional flow reserve is estimated with a one-dimensional mathematical model constructed by means of an automated algorithm. Noninvasive method values are thereafter compared with invasive method values.
详细描述
Noninvasive assessment of Fractional Flow Reserve is almost never applied in the Russian Federation due to the relative novelty and study insufficiency, lack of the appropriate resource base, specific necessary software and trained qualified personnel.
In 2015, scientists from the Institute of Numerical Mathematics RAS in collaboration with specialists of the I.M. Sechenov First Moscow State Medical University developed a noninvasive method of fractional flow reserve assessment based on a one-dimensional mathematical model. A model is constructed based on images derived from the coronary computed tomography angiography performed by standard protocol; the method is fully automated.
The aim of our study is to evaluate the diagnostic efficiency of this technique in clinical practice.
This is a pilot study; we are planning to enroll 30 patients: 13 of them underwent 64-slice computed tomography and are included retrospectively; 17 will be included prospectively, with a 640-slice CT scan. Specialists from the Laboratory of Mathematical Modeling will process CT images and evaluate noninvasive FFR. Ischemia is confirmed if FFR < 0.80 and disproved if FFR ≥ 0.80. After that, the prospective group of patients will be hospitalized for invasive FFR assessment as a reference standard; if ischemia is proved, patients will undergo stent implantation. In the retrospective group, patients already have invasive FFR values estimated.
Statistical analysis will be performed using R programming language packages (cran-r.project.com). Continuous variables will be presented as mean values ± standard deviations, order variables will be presented as medians with interquartile ranges in parentheses. We are going to use the D'Agostino-Pearson omnibus test for the assessment of normality of distribution and construct a Q-Q Plot. We will compare these two methods with the Bland-Altman analysis and ROC-analysis and will assess the degree of correlation with the Pearson's chi-squared.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Diagnostic
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 85 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Patients providing written informed consent
- •Scheduled to undergo clinically-indicated non-emergent invasive coronary angiography (ICA)
- •Has undergone >640 multidetector CCTA within 60 days prior to ICA
- •No cardiac interventional therapy between the CCTA and ICA
排除标准
- •Prior coronary artery bypass graft (CABG) surgery
- •Prior percutaneous coronary intervention (PCI) for which suspected coronary artery lesion(s) are within a stented coronary vessel
- •Contraindication to adenosine, including 2nd or 3rd-degree heart block; sick sinus syndrome; long QT syndrome; severe hypotension, severe asthma, severe COPD or bronchodilator-dependent COPD
- •Suspicion of acute coronary syndrome (acute myocardial infarction and unstable angina)
- •Recent prior myocardial infarction within 40 days of ICA
- •Known complex congenital heart disease
- •Prior pacemaker or internal defibrillator lead implantation
- •Prosthetic heart valve
- •Significant arrhythmia or tachycardia
- •Impaired chronic renal function (serum creatinine >1.5 mg/dl
- •Patients with known anaphylactic allergy to iodinated contrast
- •Pregnancy or unknown pregnancy status
- •Body mass index >35
- •Patient requires an emergent procedure
- •Evidence of ongoing or active clinical instability, including acute chest pain (sudden onset), cardiogenic shock, unstable blood pressure with systolic blood pressure <90 mmHg, and severe congestive heart failure (NYHA III or IV) or acute pulmonary edema
- •Any active, serious, life-threatening disease with a life expectancy of less than 2 months
- •Inability to comply with study procedures
结局指标
主要结局
Diagnostic Accuracy of FFRct
时间窗: through study completion, an average of 8 months
Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of FFRct at the vessel level using binary outcomes whith compared to FFR as the reference standard.
次要结局
未报告次要终点
研究者
Daria Gognieva
Principal Investigator
I.M. Sechenov First Moscow State Medical University