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. 2013 Dec 26;13:50. doi: 10.1186/1471-2253-13-50

Table 4.

Impact of cuff shape on cuff pressure and microaspiration during continuous control of cuff pressure and routine care

Variables
 Continuous control of P cuff n = 64
 p
 Routine care n = 64
 p
  Tapered cuff n = 32 Cylindrical cuff n = 32   Tapered cuff n = 32 Cylindrical cuff n = 32  
Recording duration, h
 24 (23–24)
 24 (23–25)
 0.662
 24 (23–25)
 24 (23–24)
 0.229
Mean airway pressure, cm H2O
 13 (10–18)
 13 (11–16)
 0.749
 12 (10–20)
 15 (11–15)
 0.214
Mean Pcuff, cm H2O
 26 (25–28)
 25 (23–28)
 0.844
 21 (19–26)
 24 (21–30)
 0.143
Coefficient of Pcuff variation, %
 5 (3–9)
 6 (3–15)
 0.382
 18 (15–30)
 20 (14–39)
 0.789
Pcuff 20-30 cm H2O
  
  
  
  
  
  
  yes
 32 (100)
 32 (100)
 NA
 32 (100)
 32 (100)
 NA
  % of recording time
 97 (82–99)
 88 (56–99)
 0.147
 42 (30–62)
 44 (29–57)
 0.811
Pcuff <20 or >30 cm H2O
  
  
  
  
  
  
  Yes
 19 (59)
 22 (68)
 0.856
 32 (100)
 32 (100)
 >0.999
  Duration >30 min
 14 (43)
 19 (59)
 0.455
 30 (93)
 32 (100)
 >0.999
Pcuff <20 cm H2O
  
  
  
  
  
  
  Yes
 6 (18)
 13 (40)
 0.116
 29 (90)
 31 (96)
 >0.999
  Duration > 30 min
 3 (9)
 13 (40)
 0.011*
 29 (90)
 28 (87)
 0.371
  % of recording time
 0 (0–0)
 0 (0–12)
 0.549
 41 (17–62)
 21 (8–47)
 0.049
Pcuff >30 cm H2O
  
  
  
  
  
  
  Yes
 15 (46)
 18 (56)
 0.903
 31 (96)
 31 (96)
 >0.999
  Duration >30 min
 12 (37)
 13 (40)
 >0.999
 24 (75)
 30 (93)
 0.235
  % of recording time
 0.6 (0–24)
 1.4 (0–48)
 0.652
 11 (2–17)
 20 (6–18)
 0.031
Microaspiration of gastric content
 13 (40)
 19 (59)
 0.211
 18 (56)
 20 (62)
 0.799
Pepsin, ng/mL
 154 (105–230)
 214 (126–466)
 0.066
 175 (121–252)
 238 (101–664)
 0.238
% of tracheal aspirates positive for pepsin 0 (0–57) 43 (0–100) 0.073 40 (0–86) 50 (0–100) 0.310

Data are frequencies (%) or median (Interquartile range).

Pcuff, cuff pressure. Yes indicates that a patient had the variable at least once.

*OR (95% CI) 3.20 (1.12-9.12).