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and objectives: Complete revascularization is recommended for the management of ST-segment elevation myocardial infarctions (STEMI). Although physiological evaluation is recommended for the assessment of nonculprit lesions, in this context, the use of fractional flow reserve (FFR) is limited. The quantitative flow ratio (QFR) is a new angiography-based tool for the assessment of functional severity. We evaluated the functional changes occurring in nonculprit lesions after the acute phase and the QFR/FFR correlation in non-infarct-related arteries. Methods: We recruited all patients with multivessel disease admitted to our institution due to STEMI from January 2016 through December 2017 who underwent staged interventions for the management of nonculprit lesions. We conducted a retrospective QFR assessment at both the index and the staged procedures and drew a comparison. Also, the QFR/FFR concordance and agreement were prospectively evaluated between January and May 2018 in a cohort of patients with STEMI and multivessel disease. Results: We analyzed a total of 131 lesions in 88 patients. During the initial procedure, 93.1% of the lesions were considered significant based on the angiography compared to only 56.3% studied through QFR (P ≤ .001). The QFR reassessment during the staged intervention brought this percentage down to 32.1%. All patients with QFR values ≥ 0.82 during the index procedure 14 C. Cortés et al. REC Interv Cardiol. 2019;1(1):13-20 Abreviaturas RFF: reserva fraccional de flujo. ARI: arteria responsable del infarto. ICP: intervención coronaria percutánea. QFR: reserva de flujo cuantitativo. IAMCEST: infarto agudo de miocardio con elevación del segmento ST.

<i>Quantitative flow ratio</i> en infarto de miocardio para la evaluaci�n de lesiones en arterias no culpables. Estudio piloto QIMERA