Table 1 Variables in risk scores evaluated

Maioli Score

Age ≥ 73 years

score ≤ 3

score 4–6

score ≥ 7

Diabetes

Left ventricular ejection fraction≤45%

Baseline serum creatinine value≥1.5 mg/dL

Creatinine clearance≤44 mL/min

Pre-procedure creatinine≥ baseline creatinine

One procedure effected within the past 72 h

Chen Score

Age ≥ 70 years

score ≤ 7

score 8–12

score ≥ 13

History of myocardial infarction

Diabetes

Hypotension

Left ventricular ejection fraction≤45%

Anemia

Estimated glomerular filtration rate < 60(mL/min/1.73 m²)

High-density lipoprotein < 1 mmol/L

Urgent PCI^a

Liu Score

Age ≥ 75 years

score = 0

score = 1

score ≥ 2

Left ventricular ejection fraction< 40%

Serum creatinine> 1.5 mg/dL

Lian Score

Age > 75 years

score ≤ 1

score 1–3

score ≥ 3

Creatinine clearance< 60 mL/minute

Congestive heart failure

Lin Score

Age > 75 years

score < 1

score 1–2

score ≥ 3

Hypotension

Use of intra-aortic balloon pump

Serum creatinine> 1.5 mg/dL

Ghani Score

Basal creatinine > 115 μmol/L

score ≤ 4

score 5–8

score ≥ 9

Shock

Female gender

Multivessel PCI^a

Diabetes

Inohara Score

Age

score ≤ 0

score 1–10

score ≥ 11

≤50

51–59

60–69

70–79

80–89

90–99

Heart failure status

Diabetes

Previous percutaneous coronary intervention

Hypertension

Pre-creatinine> 1.0 mg/dL

Acute coronary syndrome

Zeng Score

Age ≥ 75 years

score ≤ 1

score 2–4

score ≥ 5

Acute myocardial infarction

Serum creatinine > 1.5 mg/dL

IABP^b