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Table 2 Respiratory pattern and hemodynamic parameters

From: Can proportional ventilation modes facilitate exercise in critically ill patients? A physiological cross-over study

Variable tested Baseline (proportional) Exercise (proportional) Baseline (PSV) Exercise (PSV)
VO2 (ml/min) 301 (270–342) 335 (332–377) 249 (206–353)§ 337 (291–402)#
Mean Watt NA 2 (1, 2) NA 1.5 (1, 2)
Mean Paw (cm H2O) 11 (9–14) 11 (9–15) 12 (10–14) 12 (10–14)
V T (ml) 434 (342–581) 503 (380–581) 430 (300–491) 442 (314–638)
RR (br/min) 28 (19–34) 27 (22–35) 29 (21–31) 30 (24–37)
V E (L/min) 9.9 (9.1–11.9) 11.3 (10.3–15.5)# 9.6 (8.7–11.7) 11.2 (10.0–15.0)#
SBP (mmHg) 117 (106–140) 119 (112–147) 122 (101–141) 125 (117–156)
DBP (mmHg) 68 (55–78) 66 (53–79) 68 (53–83) 71 (55–82)
HR (bpm) 102 (74–114) 104 (77–118) 100 (78–109) 108 (83–118)#
HR * SBP (bpm * mmHg) 11,385 (9344–13,309) 12,053 (10,045–14,567)# 11,400 (9320–13,229) 13,772 (10,148–16,220)#
SpO2 (%) 98 (96–100) 96 (93–100) 97 (96–99) 96 (93–99)
  1. Data are median (interquartile range). VO 2 oxygen consumption, NA not applicable, V T tidal volume, RR patient respiratory rate, V E minute ventilation, SBP systolic blood pressure, DBP diastolic blood pressure, HR heart rate, SpO 2 oxygen saturation, PSV pressure support ventilation
  2. # p < 0.05, baseline versus exercise
  3. § p < 0.05, PSV versus proportional modes