Analysis of arterial blood gas values when discarding different volumes of blood samples in an arterial heparin blood collector during thoracoscopic surgery

Table 4 Differences of discarding different volumes blood sample in the arterial heparin blood collector subgroup analysis by sex

	3nd ml	4th ml	5th ml	P1	P2	P3
Female (N = 25)
PH	7.4028 ± 0.0620	7.4116 ± 0.0720	7.4140 ± 0.0760	0.013^*#	0.032^*	0.434
PaO2 (mmHg)	246.4800 ± 75.0317	231.3600 ± 68.4878	223.7600 ± 12.9895	0.006^**#	0.004^**#	0.247
PCO2 (mmHg)	39.2000 ± 7.7460	40.5200 ± 7.9221	40.7600 ± 8.3630	0.023^*	0.090	0.627
K⁺ (mmol/L)	3.0960 ± 0.3529	3.2120 ± 0.2713	3.2800 ± 0.2769	0.010^*#	0.001^**#	0.003^**#
Na⁺ (mmol/L)	141.7200 ± 2.9654	142.4200 ± 2.8326	142.4400 ± 2.5508	0.237	0.065	0.233
THbc (g/HL)	9.7520 ± 1.0713	10.3240 ± 1.0121	10.6480 ± 0.9747	0.000^**#	0.000^**#	0.004^**#
Male (N = 29)
PH	7.3628 ± 0.0473	7.3679 ± 0.0461	7.3624 ± 0.0447	0.138	0.922	0.009^**#
PaO2 (mmHg)	239.3448 ± 114.8114	232.6552 ± 106.6728	235.3448 ± 106.1789	0.348	0.605	0.608
PCO2 (mmHg)	44.4138 ± 5.9792	45.7931 ± 6.2984	46.8276 ± 6.0832	0.010^*#	0.000^**#	0.015^*#
K⁺ (mmol/L)	3.3276 ± 0.4582	3.5034 ± 0.4314	3.5759 ± 0.4197	0.000^**#	0.000^**#	0.005^**#
Na⁺ (mmol/L)	141.0000 ± 3.2950	141.4483 ± 1.7027	141.3103 ± 1.9476	0.353	0.506	0.515
THbc (g/HL)	10.7448 ± 1.4761	11.3448 ± 1.4257	11.5517 ± 1.4141	0.000^**#	0.000^**#	0.044^*

Note: Blood samples were collected using a 5 ml arterial heparin blood collector. We compared the results of blood gas analysis in 3nd ml, 4th ml, and 5th ml of blood samples. A significant difference between the 3rd, 4th, and 5th ml blood samples in both the male and female groups, and the difference between the 4th and 5th ml blood samples was smaller. No significant differences in Na + or K + levels in the male and female groups. P1: 3nd ml vs. 4th ml; P2 3nd ml vs. 5th ml; P3 4th ml vs. 5th ml. p<0.05 (marked by *) is considered significant. p<0.01 (marked by **) is considered markedly significant
^#P-value was survived after Bonferroni correction (p < 0.0167)
Abbreviation: PH: Potential of hydrogen; PaO2: Partial pressure of oxygen; PCO2: Partial Pressure of Carbon Dioxide; THbc: Total hemoglobin

ISSN: 1471-2482