TTN and myocarditis: Peripheral blood was obtained on the first day of hospital admission, total RNA was isolated from peripheral blood mononuclear cells (PBMCs), and TTN mRNA expression was quantified.<h4>Results</h4>TTN expression in PBMCs was significantly higher in patients with acute myocarditis compared with healthy controls (<i>p</i> = 0.015), corresponding to a 2.8-fold median increase.