1 Introduction Our group previously published the BALLAR score: a simple biochemical scoring system that calculates the 30-day mortality of patients requiring Impella monotherapy for left-sided support [ 1 ]. The initial scoring system comprised the following factors: (1) lactate (mmol/l: ≤1.9: 0 points, 2–4.9: 1 point, ≥5: 4 points); (2) creatinine clearance (ml/min: ≤29.9: 6 points, 30–59.9: 4 points, 60–89.9: 1 point, ≥90: 0 points); (3) serum albumin (mmol/l: <25: 6 points, 25–34.9: 3 points, ≥35: 0 points); (4) base excess (mmol/L: <−2: 2 points, ≥−2: 0 points).