Endotension is influenced by aneurysm volume: experimental findings.
OBJECTIVE
To investigate in an in vitro model whether and to what extent pressure is influenced by aneurysm size.


METHODS
Latex aneurysms of 3 different volumes (24, 30, and 81 mL) were inserted into an in vitro circulation model. The systemic mean pressure (SP(mean)) was varied from 50 to 120 mmHg. The aneurysms were excluded using a woven polyethylene graft. Aneurysm sac mean pressure (ASP(mean)) was measured.


RESULTS
In the in vitro model, endovascular aneurysm repair created a closed chamber without endoleak but showed a relevant aneurysm sac pressure. At an SP(mean) of 80 mmHg, the ASP(mean) was 42.0+/-0.6 mmHg in the 24-mL aneurysm, 40.5+/-0.5 mmHg in the 30-mL model, and 19.3+/-0.5 mmHg in the 81-mL aneurysm (p<0.05). The ASP(mean) rose with increasing SP(mean) and was inversely dependent on the aneurysm volume.


CONCLUSIONS
This in vitro model demonstrated that the sac mean pressure correlated to the systemic pressure and that a greater aneurysm volume reduced aneurysm sac pressure. These data highlight the need for further studies regarding endotension.
Gawenda
Michael
M
Division of Vascular Surgery, Department of Surgery, Medical Centre, University of Cologne, Germany. Michael.gawenda@medizin.uni-koeln.de
Winter
Stefan
S
Jaschke
Gregor
G
Wassmer
Gernot
G
Brunkwall
Jan
J
D000704:Analysis of Variance; D001014:Aortic Aneurysm / Q000503:physiopathology* / Q000628:therapy*; D021721:Balloon Occlusion / Q000379:methods*; D066298:In Vitro Techniques; D007840:Latex; D008955:Models, Cardiovascular; D011312:Pressure; D011336:Probability; D011673:Pulsatile Flow; D012680:Sensitivity and Specificity
D007840:Latex