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

Table 3 Differences of discarding different volumes blood sample in the arterial heparin blood collector

	3rd ml	4th ml	5th ml	P1	P2	P3
PH	7.2355 ± 0.0590	7.2439 ± 0.0640	7.2439 ± 0.0670	0.072	0.070	1.000
PaO2 (mmHg)	234.1000 ± 99.7570	223.8875 ± 91.1500	221.8893 ± 89.5840	0.020^*	0.023^*	0.614
PaCO2 (mmHg)	40.6179 ± 7.2040	41.9232 ± 7.4490	42.5679 ± 7.6410	0.001^**#	0.000^**#	0.037^*
K⁺ (mmol/L)	3.3929 ± 0.4180	3.5804 ± 0.3840	3.6589 ± 0.3820	0.000^**#	0.000^**#	0.000^**#
Na⁺ (mmol/L)	136.4306 ± 3.0910	136.8696 ± 2.2680	136.8893 ± 2.2730	0.137	0.099	0.882
THbc (g/HL)	10.2852 ± 1.3610	10.8722 ± 1.3180	11.1333 ± 1.2780	0.000^**#	0.000^**#	0.001^**#

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. The blood PaO2, PaCO2, and THbc concentrations were less stable when 2 ml was discarded than when 3 ml or 4 ml was discarded. The electrolyte results may be less affected by the discarding of different volumes of blood from the samples. 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