NPPB and Sepsis: SIMD: sepsis-induced myocardial dysfunction; ICU: intensive care unit; RCT: randomized controlled trial; XMLI: xinmailong infusion; BNP: b-type natriuretic peptide; CTNI: cardiac troponin I; NT-PROBNP: n-terminal pro–b-type natriuretic peptide; SOFA: sequential organ failure assessment; GLS: global longitudinal strain; LVEF: left ventricular ejection fraction; SV: stroke volume