Table 2.

Depth 33 and Depth 51 refer to depth-guided CPR at 33mm and 51 mm, respectively. CPP-20 refers to CPR directed to attain coronary perfusion pressure >20 mmHg.

	Depth 33(n=6)	Depth 51 (n=6)	CPP-20 (n=8)	p
Baseline
pH	7.52(0.01)	7.52(0.01)	7.52(0.01)	0.97
PCO2 (mmHg)	43(3)	46(2)	43(3)	0.62
PaO2 (mmHg)	135(5)	114(8)	133(7)	0.12
End of Untreated VF*
pH	7.78(0.01)‡	7.75(0.07)	7.60(0.05)	0.03
PCO2 (mmHg)	16(2)	22(6)	27(7)	0.43
PaO2 (mmHg)	91(12)	118(16)	106(21)	0.47
After 6 Minutes of CPR†
pH	7.48(0.04)‖	7.33(0.03)§	7.30(0.02)	< 0.01
PCO2 (mmHg)	33(4)**	47(4)¶	61(9)	0.022
PaO2 (mmHg)	369(68)††	223(48)	101(40)	<0.01

^*Sample drawn at 6min 30s during VF period and

^†Sample drawn at 6 minutes during protocol resuscitation period.

^‡CPP-20 vs. D33: p<0.01;

^‖CPP-20 vs. D33: p<0.01;

^††CPP-20 vs. D33: p<0.01;

^**p=0.02.

^‖D51 vs. D33: p<0.01;

^¶p=0.048.

^§p=0.048.