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Table 1 Effects of device insertion and suctioning

From: Can ventilator settings reduce the negative effects of endotracheal suctioning? Investigations in a mechanical lung model

(1) Closed catheter insertion (no suction)¤
  PPEAK MA PEEP MA Vti Vte Vti - vte
 ETT 9 before 22 6 679 659 20
      after 21 6 583 569 14
 ETT 8 before 22 6 652 635 17
      after 20 6 470 461 9
 ETT 7 before 21 6 593 566 27
      after 18 7 393 376 17
(2) Closed catheter suctioning (moderate vs. maximum suction pressure)¤
  PPEAK MA PEEP MA Vti Vte Vti - Vte
 ETT 9 mod 20 6 765 331 434
      max 17 3 873 226 647
 ETT 8 mod 18 5 623 216 407
      max 14 3 660 83 577
 ETT 7 mod 15 4 492 136 356
      max 13 5 555 21 534
(3) Bronchoscopic suctioning (moderate vs. maximum suction pressure)¤
  PPEAK MA PEEP MA Vti Vte Vti - Vte
 ETT 9 mod 17 4 647 294 353
     max 16 4 724 166 558
 ETT 8 mod 15 4 513 177 336
     max 13 3 540 52 488
 ETT 7 mod 10 4 286 8 278
     max 3 −5 389 0 389
(4) Effect of volume controlled ventilation (closed catheter system, mod. vs. max. suction pressure)
  PPEAK MA PEEP MA Vti Vte Vti - Vte
 ETT 9 mod 16 5 503 150 353
     max 13 4 506 2 504
 ETT 8 mod 16 5 506 139 367
     max 11 3 514 0 514
 ETT 7 mod 16 5 507 144 363
     max 12 5 517 9 508
(5) Effect of volume controlled ventilation (bronchoscopic suction, mod. vs. max. suction pressure)
  PPEAK MA PEEP MA Vti Vte Vti - Vte
 ETT 9 mod 15 4 507 185 322
     max 12 3 507 43 464
 ETT 8 mod 15 5 498 164 334
     max 13 5 510 13 497
 ETT 7 mod 17 4 499 185 314
     max 11 3 498 17 481
  1. ¤ = PCV, l:E 1:2, flowtrigger (F/5). Mod.suction = -382 cm H20 (-37.5 kPa). Max.suction = -765 cm H20 (-75 kPa)
  2. The table exemplifies an experiment were a conventional ventilator setting is used; I:E ratio 1:2 and flowtrigger F/5. Model airway pressures and tidal volumes are presented with variations in ETT size, suction device, suction pressure level and ventilation mode (PCV in sections 1–3, VCV in section 4–5)