Clinical trial NCT02650557: Prediction Value of Ecg on Coronary Slow-flow
Official title: Prediction Value of Ecg on Coronary Slow-flow (PECS) Study
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Coronary Slow Flow
Keywords: coronary slow flow
P-wave dispersion
Lead sponsor: Sun Yat-sen University
Sponsor class: OTHER
First posted: 2016-01-08
Enrollment: 998
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: CASE_CONTROL
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: All of the subjects had chest pain and were referred to our catheterization laboratory for coronary angiography. Diagnosis of CSF was based on thrombolysis in myocardial infarction (TIMI) frame count (TFC).

Brief summary: The investigators aimed to investigate the vessel heterogeneity of Thrombolysis in Myocardial Infarction frame count (TFC) in the three coronary arteries, and its relation to P-wave dispersion, in patients with coronary slow flow and otherwise normal coronary arteries.

Detailed description: Coronary slow flow (CSF) phenomenon, which is characterized by delayed coronary opacification in the absence of obstructive epicardial coronary artery disease, is a relatively common finding in patients undergoing routine coronary angiography and is often associated with chest pain. In some patients with CSF, blood flow may be heterogeneously distributed in the three coronary arteries, suggesting the heterogeneously distributed microvascular dysfunction in the myocardium. However, the vessel heterogeneity of Thrombolysis in Myocardial Infarction (TIMI) frame count (TFC) has not been fully elucidated.

P-wave dispersion (PWD) is defined as the difference between the longest and the shortest P-wave duration recorded from multiple different surface electrocardiogram (ECG) leads, and it has been reported to be associated with inhomogeneous and discontinuous propagation of sinus impulses5, which are well known electrophysiologic characteristics of the atrium prone to fibrillation. Although it is plausible to hypothesize that PWD might be associated with the heterogeneously distributed microvascular dysfunction, and previous studies have demonstrated the abnormal PWD in patients with CSF, the correlation between TFC heterogeneity and PWD has never been evaluated.

In this study, the investigators aimed to investigate the vessel heterogeneity of TFC in the three coronary arteries, and its relation to PWD, in patients with CSF and otherwise normal coronary arteries.

Eligibility criteria: Inclusion Criteria:

* All of the subjects had chest pain and were referred to our catheterization laboratory for coronary angiography

Exclusion Criteria:

* Valvular or congenital heart disease
* Atrial fibrillation or other arrhythmia that would interfere with ECG analysis
* Left ventricular hypertrophy
* Myocardial or pericardial disease
* Chronic obstructive pulmonary disease, or electrolyte abnormalities.
* Subjects taking antiarrhythmic, antiischemic, β-blocker, or calcium-channel blocker medications were also excluded from the study.

Primary outcomes:
measure: Average thrombolysis in myocardial infarction (TIMI) frame count (TFC) in the three coronary arteries and its relation to P waves parameters on ECG in patients with CSF and otherwise normal coronary arteries
timeFrame: 24-72 hours
Secondary outcomes:
measure: maximum and minimum P wave duration (Pmax and Pmin) and major adverse cardiac events (MACE) in patients with CSF and otherwise normal coronary arteries
timeFrame: 24 hours-30 days
Other outcomes:
Locations:
city: Guangzhou
country: China
facility: Xiaodong Zhaung
state: Guangdong
Study officials:
affiliation: fitst affiliated hospital of SYSU
name: zhimin du, MD
role: PRINCIPAL_INVESTIGATOR
References: