Detection of acute myocardial ischemia using high-frequency QRS analysis

• To assess the feasibility of HFQRS-based detection of acute ischemia using a single, unreferenced measurement. HFQRS analysis by the HyperQTM algorithm: (1) QRS detection identifies valid QRS complexes, (2) QRS alignment and averaging to improve SNR, (3) Detection of QRS boundaries, (4) Band-pass filtering (150-250Hz) to obtain HFQRS. Intensity and morphology indices are extracted from HFQRS to produce a trend line (5), or a color-coded HFQRS map (6).