Temporary caval stenting improves venous drainage during cardiopulmonary bypass

Interact Cardiovasc Thorac Surg. 2008 Dec;7(6):1096-100. doi: 10.1510/icvts.2008.182246. Epub 2008 Aug 12.


Objectives: Assess the benefit of temporary caval stenting for remote venous drainage during cardiopulmonary bypass (CPB).

Methods: Temporary caval stenting was realized in bovine experiments (65+/-6 kg) by the means of self-expanding (18F for insertion, 36F in situ) venous cannulas (Smartcanula LLC, Lausanne, Switzerland) with various lengths: 43 cm, 53 cm, 63 cm vs. a standard 28F wire armed cannula in trans-jugular fashion. Maximal blood flows were assessed for 20, 25 and 30 mmHg of driving pressure with a motorized table height adjustment system. In addition, the inferior caval diameters (just above its bifurcation) were measured in real time with intra-vascular ultrasound (IVUS).

Results: Venous drainage (flow in l/min) at 20 mmHg, 25 mmHg, and 30 mmHg drainage load was 3.5+/-0.5, 3.7+/-0.7 and 4.0+/-0.6 for the 28F standard vs. 4.1+/-0.7, 4.0+/-1.3 and 3.9+/-1.1 for the 36F smart 43 cm, vs. 5.0+/-0.7, 5.3+/-1.3 and 5.4+/-1.4 for the 36F smart 53 cm, vs. 5.2+/-0.5*, 5.6+/-1.1* and 5.8+/-1.0* for the 36F smart 63 cm. The inferior vena caval diameters at 30 mmHg were 13.5+/-4.8 mm for 28F standard, 11.1+/-3.6 for 36F smart 43 cm, 11.3+/-3.2 for 36F 53 cm, and 17.0+/-0.1* for 36F 63 cm (*P<0.05 for 28F standard vs. 36F smart 63 cm long)

Conclusions: The 43 cm self-expanding 36F smartcanula outperforms the 28F standard wire armed cannula at low drainage pressures and without augmentation. Temporary caval stenting with long self-expanding venous cannulas provides even better drainage (+51%).

Publication types

  • Comparative Study

MeSH terms

  • Animals
  • Blood Flow Velocity
  • Cardiopulmonary Bypass*
  • Catheterization, Central Venous / instrumentation*
  • Cattle
  • Central Venous Pressure
  • Equipment Design
  • Gravitation
  • Prosthesis Design
  • Regional Blood Flow
  • Stents*
  • Ultrasonography, Interventional
  • Vena Cava, Inferior / diagnostic imaging
  • Vena Cava, Inferior / physiopathology*