title: Relationship of residual intraluminal to intrathrombotic pressure in a closed aneurysmal sac.
abstract: OBJECTIVE
  This study was undertaken to determine the relationship of residual intraluminal aneurysmal sac pressure (ILASP) to intrathrombic aneurysm sac pressure (ITASP) and to define the relationship between abdominal aorta aneurysm (AAA) size (anteroposterior or transverse diameter), volume of intraluminal thrombus, and residual ITASP.
  
  
  METHODS
  We measured ILASP and ITASP after proximal aortic neck and distal iliac clamping by placing angiocatheters into the lumen and thrombus of an excluded aneurysm sac in 41 consecutive patients. Simultaneously, mean blood pressure was recorded and aneurysm sac pressure ratio was calculated. Changes in ILASP and ITASP after clamping of the inferior mesenteric artery were recorded. In addition, correlation between AAA size, volume of intraluminal thrombus in AAA, and residual ITASP was determined.
  
  
  RESULTS
  Mean ILASP/blood pressure ratio was 0.40 (SD, 0.20). Mean ITASP/blood pressure ratio was 0.37 (SD, 0.23). There was a significant positive correlation of 0.47 between ITASP and ILASP (P =.002). Clamping of the inferior mesenteric artery resulted in markedly decreased ITASP in 2 patients (n = 40) and ILASP in 4 patients (n = 41). Each centimeter increase in AAA size resulted in a 47 mL increase in thrombus volume.
  
  
  CONCLUSIONS
  Increased ILASP results in corresponding increase in ITASP, and increased AAA size is associated with increased thrombus volume. However, neither thrombus volume nor AAA size has any relationship to ITASP.
authors.affiliation: Department of Surgery, St John Macomb Hospital, Warren, MI, USA.
authors.forename: Sachinder Singh
authors.initials: SS
authors.lastname: Hans
authors.forename: Olan
authors.initials: O
authors.lastname: Jareunpoon
authors.forename: Raywin
authors.initials: R
authors.lastname: Huang
authors.forename: Bijaya
authors.initials: B
authors.lastname: Hans
authors.forename: Paul
authors.initials: P
authors.lastname: Bove
authors.forename: Gerald B
authors.initials: GB
authors.lastname: Zelenock
mesh_terms: D017542:Aneurysm, Ruptured / Q000150:complications / Q000503:physiopathology*; D017544:Aortic Aneurysm, Abdominal / Q000150:complications / Q000503:physiopathology*; D001157:Arterial Occlusive Diseases / Q000150:complications / Q000503:physiopathology; D001794:Blood Pressure / Q000502:physiology*; D006801:Humans; D008161:Lumbosacral Region / Q000000981:diagnostic imaging / Q000503:physiopathology; D017537:Mesenteric Artery, Inferior / Q000000981:diagnostic imaging / Q000503:physiopathology; D008824:Michigan; D013223:Statistics as Topic; D013927:Thrombosis / Q000150:complications / Q000503:physiopathology*; D014057:Tomography, X-Ray Computed