Table 4

Selected predictors of achieving a 25% increase VO2 (responders) during modified speed exercise test

RespondersNon-respondersP value
Age, mean (SD), years60.1 (6.9)57.3 (7.1)0.419
Female, n (%)0 (0)1 (6.67)0.627
Body mass index, median (IQR), kg/m2 27.6 (26–29.4)30 (24.4–34.7)0.785
Days on LVAD, median (IQR)221 (133–315)223 (141–329)0.815
NYHA class, median (IQR)1 (1–1)2 (1.5–2)0.006
Haemoglobin, mean (SD), g/dL11.6 (1.2)12.9 (1.6)0.079
Mean arterial pressure, median (IQR), mm Hg92.5 (83.5–100.8)91.7 (87.7–97.3)0.817
Fixed speed VO2 peak, mean (SD), mL/kg/min9.4 (1.8)11.8 (2.3)0.028
Pump speed, mean (SD), RPM2637 (151)2727 (238)0.405
EF Teichholz, median (IQR), %15 (10–20)15 (15–17.5)0.938
RVFWS, median (IQR), %−11.8 (−12.7 to −8.3)−11.2 (−13.1 to −4.6)0.958
  • Continuous variables are represented as mean (SD) and median (IQR); categorical variables are presented as numbers (%); p values are from unpaired samples t-test (normal distribution), Wilcoxon rank-sum test (non-normal distribution) and Fisher’s exact test (unpaired categorical data).

  • EF, ejection fraction; LVAD, left ventricular assist device; NYHA, New York Heart Association; RVFWS, right ventricular free wall strain.