Intraoperative hypotension is a risk factor for postoperative acute kidney injury after femoral neck fracture surgery: a retrospective study

Table 2 Baseline laboratory and hemodynamic variables in the AKI and non-AKI groups

Variable	AKI (n = 44)	Non-AKI (n = 204)	P-value
Hemoglobin (g/dL)^a	11.1 ± 1.5	12.1 ± 1.4	< 0.001^*
Sodium (mg/dL)^a	136.6 ± 4.0	137.4 ± 9.7	0.558
Potassium (mg/dL)^a	4.0 ± 0.5	4.1 ± 0.4	0.521
BUN (mg/dL)^a	26.4 ± 18.5	18.5 ± 8.7	< 0.001^*
Preoperative serum Cr (mg/dL)^a	1.4 ± 1.0	1.0 ± 1.0	0.034^*
Postoperative serum Cr (mg/dL)^a	2.4 ± 1.0	1.0 ± 0.8	< 0.001^*
eGFR (mL/min per 1.73 m²)^a	60.7 ± 32.3	77.0 ± 26.1	< 0.001^*
Proteinuria (n, %)	14 (31.8)	33 (16.2)	0.029^*
ESR (mm/h)^a	30.0 ± 20.4	18.9 ± 15.2	< 0.001^*
CRP (mg/dL)^a	39.3 ± 49.5	23.2 ± 34.9	0.012^*
Time of operation (min)^a	55.0 ± 15.4	60.2 ± 20.1	0.104
Intraoperative blood loss (mL)^a	523.1 ± 226.9	485.3 ± 153.4	0.472
ASA scores			0.203
II	109 (53.4%)	17 (38.6%)
III	91 (44.6%)	26 (59.1%)
IV	4 (2.0%)	1 (2.3%)
Intraoperative hypotension (n, %)	26 (59.1)	91 (44.6)	0.042^*
Postoperative blood loss (mL)	260.5 ± 270.5	246.9 ± 184.6	0.707

ASA American Society of Anesthesiologists, BUN blood urea nitrogen, Cr creatinine, CRP C-reactive protein, eGFR estimated glomerular filtration rate, ESR erythrocyte sedimentation rate
^aValues are presented as mean ± standard deviation
^*Statistically significant between the 2 groups (P < 0.05)

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