Table 1 Definitions of clinical parameters

Diabetes mellitus

The diagnosis is based on one of four abnormalities outlined by American Diabetes Association, 2010: glycated hemoglobin (A1C) ≥6.5 %, fasting plasma glucose (FPG) ≥126 mg/dl, random plasma glucose ≥200 mg/dl with symptoms, or two-hour plasma glucose ≥200 mg/dl during an oral glucose tolerance test (OGTT)

Functional status

Patient requiring no, partial or totally dependent assistance from another person for activities of daily living before surgery

Hypertension

Patient with elevated blood pressure requiring medication

Chronic renal failure

Patient with a rising creatinine >3 mg/dl or a decreased glomerular filtration rate of less than 60 ml/min/1.73 m² for 3 or more months

Liver cirrhosis

Diagnosis based on clinical, laboratory and echographic findings

SIRS

Includes the presence of two or more of the following: temperature >38 °C or <36 °C, heart rate >90 bpm, respiratory rate >20 breaths/min or PaCO₂ < 32 mm/Hg, WBC >12,000/mm³ or <4000/mm³, or >10 % immature (band) forms, anion gap acidosis

Septic shock

Includes sepsis and documented organ and/or circulatory dysfunction

ASA score

1 = normal healthy patient

2 = patient with mild systemic disease

3 = patient with severe systemic disease

4 = patient with severe systemic disease that is a constant threat to life

5 = moribund patient who is not expected to survive without the operation

Limb loss

Amputation of the lower or upper limb above the ankle or the wrist, respectively.