Heart rate(bpm);Y PaO2(mmHg);X
322 48.2
320 48.0
260 43.0
190 35.5
170 33.5
120 28.3
90 25
80 24.2
Y=9.98X-162.30, R2=1.00, P<0.001
Table 1: Although no correlation was found between heart rate and PaO2 higher than 50 mm Hg, close correlation of rabbit heart rate (X, bpm) and PaO2 (Y, mm Hg), lower than 50 mm Hg was noticed (Calculated Umezawa data [2]).