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Table 2 Results of pH analysis with Khuri Intramyocardial pH probe

From: Coronary bypass grafting using crossclamp fibrillation does not result in reliable reperfusion of the myocardium when the crossclamp is intermittently released: a prospective cohort study

  Total Ph Recoverers non recoverers p value
Initial pH 7.133 (SD 0.0635)
range 6.974–7.239
7.132 (SD 0.0121) 7.134 (SD 0.0305) 0.958
pH after 1st XC 6.381 (SD 0.165)
range 6.034–6.684
6.445 (SD 0.126) 6.317 (SD 0.183) 0.124
pH Recovery after 1st XC 6.723 (SD 0.324)
range 6.200–7.222
6.990 (SD 0.561)
range 6.808–7.222
6.455 (SD 0.067)
range 6.2000–6.737.
<0.0005
pH after 2nd XC 6.495 (SD 0.192)
range 6.118 – 6.820
6.610 (SD 0.131) 6.381 (SD 0.180) 0.012
Ph Recovery after 2nd XC 6.769 (SD 0.303)
range 6.210 – 7.159
7.005 (SD 0.1193) 6.537 (SD 0.240) <0.0005
pH after 3rd XC 6.530 (SD 0.267)
range 6.19 to 6.89
6.736 (SD 0.159) 6.376 (SD 0.224) 0.006
pH recovery after 3rd XC 6.919 (SD 0.304)
range 6.23 to 7.28
7.081 (SD 0.0838) 6.798 (SD 0.356) 0.084
Final pH 7.050 (SD 0.188)
range 6.55–7.33.
7.062 (SD 0.0945) 7.038 (SD 0.258) 0.810
pH drop for each period of cross clamping
Drop in 5 mins 1st XC   0.355 (SD 0.0690) 0.320 (SD 0.165)  
Drop in 5 mins 2nd XC   0.186 (SD 0.175) 0.0742 (SD 0.0708)  
Drop in 5 mins 3rd XC   0.152 (SD 0.0696) 0.103 (SD 0.119)  
  P value 0.009