The reactive hyperaemia index (RHI) is a measure of peripheral endothelial function.
RHI was already shown to correlate with microvascular coronary endothelial dysfunction.
RHI < 1.67 independently predicts peak TnI values in STEMI patients treated with P-PCI.
Endothelial dysfunction may be a marker of poor prognosis in these patients.
Endothelial dysfunction may be a therapeutic target in patients with STEMI.