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Table 3 Proportion of patients considered as appropriately ventilated according to tests used alone or in various strategies

From: Monitoring of noninvasive ventilation: comparative analysis of different strategies

Evaluation criteria

Patients fulfilling criteria for appropriate ventilation according to tests performed alone or in combination

Cohen’s к coefficienta

Assessment tools used alone

 Data from Bbuilt-in ventilator software polygraphy

43 (43%)

0.685 [0.545–0.825]

 TcPCO2

73 (73%)

0.332 [0.201–0.465]

Assessment tools used in combination

 ABG + nocturnal SpO2 (strategy A)

53 (53%)

0.557 [0.406–0.707]

 Nocturnal SpO2 + TcPCO2 (strategy B)

48 (48%)

0.601 [0.436–0.755]

 Data from Bbuilt-in ventilator software polygraphy + TcPCO2 (strategy C)

35 (35%)

0.943 [0.876–1]

 ABG + nocturnal SpO2 + ventilator softwareBuilt-in polygraphy + TcPCO2 (strategy D)

29 (29%)

 
  1. Data are presented as n (%)
  2. Abnormal arterial blood gases defined as: PaCO2 ≥ 45 mmHg
  3. Abnormal nocturnal SpO2 defined as: time spent with SpO2 < 90% for ≥ 30% of total recording time [21]
  4. Abnormal nocturnal TcPCO2 defined as: mean TcPCO2 ≥ 50 mmHg [22, 23]
  5. Abnormal data from built-in ventilator software polygraphy defined as abnormal if: 1/leaks (> 24 l/min for > 20% of total recording time); 2/continuous desaturation (SpO2 < 90% for > 30% of recording) or 3/cumulated desaturations (> 3% during > 10% of recording) [8]
  6. ABG arterial blood gases; SpO2 transcutaneous pulsed oxygen saturation, TcPCO2 transcutaneous carbon dioxide partial pressure
  7. a The capacity of different methods of NIV monitoring was evaluated with Cohen’s к coefficient in comparison to strategy D