A Newly Developed Sublingual Tonometric Method for the Evaluation of Tissue Perfusion and Its Validation In Vitro and in Healthy Persons In Vivo and the Results of the Measurements in COPD Patients

Table 2

Sublingual PCO₂, arterialized capillary blood PCO₂, and pH values in healthy controls and COPD patients.

	PslCO2; mmHg^*	PcCO2; mmHg^*	PslCO2 − PcCO2; mmHg^#	pH^#
Healthy controls
Number	10	10	10	10
Mean ± SD	39.7 ± 2.8	37.7 ± 1.3^e	2.0 ± 3.1	7.43 ± 0.02
COPD stage II
Number	15	15	15	15
Mean ± SD	37.4 ± 5.2	36.6 ± 3.0	0.8 ± 4.5	7.43 ± 0.02
COPD stage III
Number	22	22	22	22
Mean ± SD	43.5 ± 8.1	41.2 ± 4.6	2.3 ± 6.7	7.43 ± 0.02
COPD stage IV
Number	17	17	17	17
Mean ± SD	51.6 ± 8.8^a	49.9 ± 8.2^a	1.6 ± 4.2	7.41 ± 0.03
COPD in all cases
Number	54	54	54	54
Mean ± SD	44.4 ± 9.3	42.7 ± 7.7	1.7 ± 5.4	7.42 ± 0.02

, carbon dioxide sublingual partial pressure; , carbon dioxide arterialized capillary partial pressure; _cpH, arterialized capillary pH;  ^*, ANOVA result for comparison of the four groups;  ^#, ANOVA result for comparison of the four groups;  ^a, compared to the other groups; ^b, compared to COPD II and COPD III; ^c, compared to COPD II and COPD III; ^d, compared to COPD III and COPD IV; ^e, compared to .