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Śpiewak, Mateusz; Kłopotowski, Mariusz; Kowalik, Ewa; Kubik, Agata; Ojrzyńska-Witek, Natalia; Petryka-Mazurkiewicz, Joanna; Michalak, Ewa; Mazurkiewicz, Łukasz; Gawor, Monika; Kożuch, Katarzyna; Miłosz-Wieczorek, Barbara; Grzybowski, Jacek; Bilińska, Zofia; Witkowski, Adam; Klisiewicz, Anna; Marczak, Magdalena
Scientific reports, 03/2021, Volume: 11, Issue: 1Journal Article
In hypertrophic cardiomyopathy (HCM) patients, left ventricular (LV) maximal wall thickness (MWT) is one of the most important factors determining sudden cardiac death (SCD) risk. In a large unselected sample of HCM patients, we aimed to simulate what changes would occur in the calculated SCD risk according to the European HCM Risk-SCD calculator when MWT measured using echocardiography was changed to MWT measured using MRI. All consecutive patients with HCM who underwent cardiac MRI were included. MWT measured with echocardiography and MRI were compared, and 5-year SCD risk according to the HCM Risk-SCD calculator was computed using four different models. The final population included 673 patients 389 (57.8%) males, median age 50 years, interquartile range (36-60). The median MWT was lower measured by echocardiography than by MRI 20 (17-24) mm vs 21 (18-24) mm; p < 0.0001. There was agreement between echocardiography and MRI in the measurement of maximal LV wall thickness in 96 patients (14.3%). The largest differences between echo and MRI were - 13 mm and + 9 mm. The differences in MWT by echocardiography and MRI translated to a maximal difference of 8.33% in the absolute 5-year risk of SCD, i.e., the echocardiography-based risk was 8.33% lower than the MRI-based estimates. Interestingly, 13.7% of patients would have been reclassified into different SCD risk categories if MRI had been used to measure MWT instead of echocardiography. In conclusion, although there was high general intermodality agreement between echocardiography and MRI in the MWT measurements, the differences in MWT translated to significant differences in the 5-year risk of SCD.
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