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Table 2 Comparisons of characteristics between Survivors and Non–survivors

From: Association between delta anion gap and hospital mortality for patients in cardiothoracic surgery recovery unit: a retrospective cohort study

Variable Survivors (n = 2841) Non–survivors (n = 19) p value
Age (y) 67.7 ± 12.1 81.2 ± 8.6 < 0.001*
Male, n (%) 1927 (67.8) 7 (36.8) 0.002*
White, n (%) 2249 (79.2) 12 (63.2) 0.088
Body mass index, Kg/m2 28.9 ± 6.0 28.8 ± 6.3 0.986
Ventilation, n (%) 2428 (85.5) 11 (57.9) 0.001*
SOFA 5(3–7) 6(4–8) 0.109
SAPS II 36.8 ± 12.5 51.2 ± 13.5 < 0.001*
SIRS 2.8 ± 0.9 3.2 ± 0.9 0.077
Comorbidities
 COPD, n (%) 20 (0.7) 0 (0) > 0.999
 Hypertension, n (%) 1780 (62.7) 6 (31.6) 0.005*
 Diabetes, n (%) 910 (32.0) 7 (36.8) 0.654
AG initial (mEq/L) 11.3 ± 2.6 15.8 ± 4.1 < 0.001*
AGmax (mEq/L) 12.9 ± 3.3 21.9 ± 8.2 < 0.001*
ΔAG (mEq/L) 2 (1–5) 7 (4–15) < 0.001*
ΔNa + (mEq/L) 7 (5–9) 13 (5–20) 0.012*
ΔCl − (mEq/L) 4 (3–7) 4 (0–9) < 0.001*
ΔHCO3 − (mEq/L) 7 (5–9) 14 (7–19) < 0.001*
Postoperative complications, n (%)
 AKF 381 (13.4) 11 (57.9) < 0.001*
 Acidosis 146 (5.1) 4 (21.1) 0.015*
Arrhythmia 1175 (41.4) 13 (68.4) 0.017*
Acute respiratory failure 151 (5.3) 5 (26.3) 0.003*
Pneumonia 26 (0.9) 2 (10.5) 0.014*
Pulmonary embolism 21 (0.7) 0 (0.0) > 0.999
Laboratory indexes on POD1
 Serum creatinine (mg/dL) 0.9 (0.8–1.2) 1.5 (0.8–2.2) 0.001*
 Urea nitrogen (mg/dL) 19 (14–26) 38 (22–63) < 0.001*
 Glucose (mg/dL) 127.6 ± 18.9 144.2 ± 51.8 < 0.001*
 pH 7.40 ± 0.06 7.31 ± 0.13 < 0.001*
 Base excess (mEq/L) 1 (0–3) − 1 (− 9–1) < 0.001*
 Lactate (mmol/L) 1.3 (1–1.6) 1.7 (1.4–2.8) 0.002*
  1. SOFA sequential organ failure assessment, SAPSII simplified acute physiology score II, SIRS systemic inflammatory response syndrome, AKF acute kidney failure, COPD chronic obstructive pulmonary disease, AG anion gap