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Endothelium-independent relaxation response to sodium nitroprusside in isolated rat pulmonary artery rings. SNP= sodium nitroprusside. No difference of endothelium-independent relaxation to sodium nitroprusside among the groups. Six Rats/Group. CON=Control Group, ALI=Acute lung injury Group, LV=Low tidal volume Group, VLV=Very low tidal volume Group, MV=Large tidal volume Group.
