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. 2010 Feb 25;108(5):1084–1096. doi: 10.1152/japplphysiol.90963.2008

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Fig. 4. — Tricuspid valve maximum pressure difference (ΔPmax) during the 3 main protocols: hypercapnia (circles), hypocapnia (squares), and control (triangles). Closed symbols indicate measurements made under hypercapnic (hypercapnia protocol) or hypocapnic (hypocapnia protocol) conditions; open symbols indicate measurements made under eucapnic conditions. Data are means for 12 subjects; error bars are ± SE. ΔPmax was significantly affected by both hypercapnia and hypocapnia compared with control (P < 0.001, rmANOVA).