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Intensive Care Medicine Experimental

Table 3 Measured and predicted time for complete exhalation

From: Six methods to determine expiratory time constants in mechanically ventilated patients: a prospective observational physiology study

 

PCV

VCV

Complete exhalation time (s)*

1.57 (1.50–1.62)

1.60 (1.54–1.66)

Measured time to exhale 95% of VTe (s)**

1.27 (1.22–1.32)

1.30 (1.25–1.35)

Predicted time to exhale 95% of VTe***

1.77 (1.70–1.84)

1.80 (1.73–1.88)

  1. Values are given in seconds as means with their corresponding 95% confidence intervals
  2. *Measured from start of exhalation (SOE) until the expiratory flow dropped to 0.04L/sec
  3. **Measured time from SOE until exhaled tidal volume (VTe) reached 95%
  4. ***Predicted time to exhale 95% of VT by multiplying the first measured (τ1) by three (i.e., 3*τ1)
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