Optimisation and Effect Analysis of the Blood Collection Method in Pre-Deposit Autotransfusion Patients Undergoing Thoracotomy Surgery

Figures & data

Table 1 Comparison of General Baseline Data Between the Two Groups

Variable	Control Group (n=47)	Test Group (n=45)	t/χ^2 value	p value
Age (years)	65.13±6.96	64.40±7.84	t=0.471	0.639^a
Gender          Male	21 (44.68%)	21 (46.67%)	χ^2=0.037	0.848^b
Female	26 (55.32%)	24 (53.33%)
Height (cm)	166.53±5.61	166.58±5.65	t=0.039	0.969 ^a
Weight (kg)	64.4±5.93	64.42±5.74	t=0.015	0.988 ^a
Body mass index (kg/m^2)	23.27±2.38	23.27±2.37	t=0.006	0.996 ^a
Hemoglobin (g/L)	131.55±10.07	131.51±9.49	t=0.021	0.984 ^a
With atrial fibrillation      No	31 (65.96%)	30 (66.67%)	χ^2=0.005	0.943 ^b
Yes	16 (30.04%)	15 (33.33%)
Oral Warfarin       No	30 (63.83%)	30 (66.67%)	χ^2=0.082	0.775 ^b
Yes	17 (36.17%)	15 (33.33%)

Notes: ^aIndependent sample t-test, ^bChi square test.

Figure 1 Routine blood collection method (bevel up) and optimized needle insertion method (bevel down). (A) Routine blood collection method; (B) Optimized needle insertion method.

Table 2 Comparison of Blood Spill (Cases), Bruise Area (Cases), Blood Clot (Cases), and Dizziness (Cases) Between the Two Groups

Variable		Control Group (n=47)	Test Group n=45)	χ^2 value	p value
Blood spill	No	9 (19.1%)	45 (100%)	61.986	<0.001
	Yes	38 (80.9%)	0 (0.0%)
Bruise area	No	17 (36.2%)	39 (86.7%)	24.611	<0.001
	Yes	30 (63.8%)	6 (13.3%)
Blood clot	No	42 (89.4%)	45 (100%)	3.204	0.073
	Yes	5 (10.6%)	0 (0.0%)
Dizziness	No	46 (97.9%)	44 (97.8%)	0.001	0.975
	Yes	1 (2.1%)	1 (2.2%)

Note: Chi-square test was used.

Table 3 Comparison of Heart Rate (Times/Min) and Blood Pressure (mmHg) Between the Two Groups Before and After Blood Collection

Variable	Group	Before Treatment (n=47)	After Treatment (n=45)	t value	p value ^a
Heart rate	Control group (n=47)	77.19±6.20	77.94±6.83	0.496	0.622
	Test group (n=45)	76.11±5.59	77.22±4.32	1.812	0.077
	T group	0.877	0.602
	p value ^b	0.383	0.549
Systolic blood pressure	Control group (n=47)	124.85±7.94	125.7±6.75	1.258	0.215
	Test group (n=45)	124.93±7.04	125.76±6.41	1.459	0.152
	T group	0.052	0.039
	p value ^b	0.958	0.969
Diastolic blood pressure	Control group (n=47)	77.87±5.79	77.43±4.29	0.969	0.338
	Test group (n=45)	77.62±5.08	76.6±4.40	2.036	0.048
	T group	0.220	0.911
	p value ^b	0.827	0.365

Notes: ^aPaired sample t-test, ^bIndependent sample t-test.

Table 4 Comparison of Patient Pain Score (NRS Score: Minutes) and Blood Collection Time (Seconds) Between the Two Groups

Variable	Control Group (n=47)	Test Group (n=45)	t value	p value
Patient pain score (points)	2.51±0.98	1.53±0.69	5.556	<0.001
Time (s)	766.62±83.18	481.98±69.76	17.744	<0.001

Note: Paired sample t-test was used.