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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: JACC Cardiovasc Imaging. 2015 Nov;8(11):1309–1321. doi: 10.1016/j.jcmg.2015.09.006

Figure 4. High frequency QRS analysis (HF-QRS).

Figure 4

Multiple representative QRS complexes are aligned and averaged. The signal in the 150-250 Hz frequency band is measured in each of the standard 12 leads, and a time intensity curve is generated. A decrease in the HF-QRS signal that is both ≥50% and ≥1µV in 3 or more leads is concerning for ischemia. ECG=electrocardiogram.With permission from Sharir et al.(35)