The relationship between fragmented QRS and functional significance of coronary lesions

- Functional significance of coronary artery stenosis is of utmost clinical importance in the management of the disease.
- Recently, fragmented QRS (fQRS) on electrocardiography (ECG) has been introduced as a predictor of myocardial scarring, as well as myocardial ischemia.
- Presence of fQRS on ECG is associated with functional significance or ischemia of intermediate coronary artery lesions.
- fQRS was a good ECG predictor of the underlying coronary artery disease and/or the severity of the disease

BackgroundRecently fragmented QRS (fQRS) on electrocardiography (ECG) has been introduced as a predictor of myocardial scarring and myocardial ischemia in coronary artery disease (CAD).ObjectiveThe aim of this study was to investigate the relationship between fQRS and fractional flow reserve (FFR) results in patients with the intermediate degree of coronary artery stenosis.MethodsA total of 301 consecutive patients who underwent coronary angiography (CAG) and FFR measurement for intermediate coronary artery stenosis were included in the study. The study patients were divided into two groups: the low FFR group (FFR value of ≤0.80) and normal FFR (FFR value of >0.80) group. Both groups were compared in terms of the presence of fQRS.ResultsOf 301 patients, fQRS was detected in 128 (42.5%) and low FFR was detected in 115 (38.2%). In the low FFR group, fQRS was significantly higher (P < 0.001). Multivariate analysis showed that fQRS was an independent predictor of myocardial ischemia in patients with intermediate coronary stenosis (OR = 7.202, CI 95%, 4.195-12.367; p < 0.001). The presence of fQRS had 70% sensitivity and 74% specificity for the prediction of FFR ≤ 0.80.ConclusionIn clinical practice, the presence of fQRS on ECG is associated with myocardial ischemia in patients with intermediate coronary stenosis.