Journal of Angiology & Vascular Surgery Category: Medical Type: Research Article
How Intra-Abdominal Pressure Increment Could Affect Cardiovascular Monitoring: A Simulation Assay
- Gomes VCS1*, Raghavan ML2, Chung TKJ2, Gomes J3, Silva AQ4, Silvestre GCR4, Marques MA4, Da Silva ES4
- 1 Department Of Surgery, Vascular And Endovascular Surgery Division, Laboratory Of Medical Investigation, University Of São Paulo School Of Medicine, Brazil
- 2 Department Of Biomedical Engineering, Seamans Center For The Engineering Arts And Sciences, The University Of Iowa, Iowa, United States
- 3 Department Of Electrical Engineering, Shamah Engineering Consulting, São Paulo, Brazil
- 4 Department Of Surgery, Vascular And Endovascular Surgery Division, Laboratory Of Medical Investigation, University Of São Paulo School Of Medicine, São Paulo, Brazil
*Corresponding Author:Gomes VCS
Department Of Surgery, Vascular And Endovascular Surgery Division, Laboratory Of Medical Investigation, University Of São Paulo School Of Medicine, Brazil
Tel:+55 1155940531; +55 11999098280,
Received Date: Dec 19, 2017 Accepted Date: Mar 28, 2018 Published Date: Apr 13, 2018
MATERIALS AND METHODS
Figure 1: Photography of the experimental apparatus. 1: phantom chamber, 2: digital pressure gauges, 3: flowmeter, 4: electric circuit control box, 5: fluid reservoir, 6: pump.
The calculated compliance of the silicone tube was 3.246%/mmHg × 10-2 under a blood pressure of approximately 90 mmHg. Tai et al., described the compliance of human arteries (in this case, samples of external iliac arteries collected from donors of organ transplants) of approximately 3.0%/mmHg x 10-2 under similar arterial pressure . This information experimentally demonstrates the biomechanical similarity between the silicone tube phantom used as specimen and an actual artery validating it as an adequate aorta replacement for the present experiment. Is important to highlight that Tai et al. studied the compliance of organ donors iliac arteries. In general, these patients are younger and have a mild degree of atherosclerosis. Ninomiya et al., demonstrated experimentally that the aging process makes the infrarenal aorta tissue less elastic / more rigid . The present silicone phantom has a biomechanical behavior similar to an artery with mild atherosclerosis.
Figure 3A: Vertebral column phantom developed using DurepoxTM resin, based on the anatomical information of Gocmen-Mas et al. .
Figure 4: Effect of IAP on aortic flow and mean arterial pressure upstream (upper limb pressure) and downstream (lower limb pressure) to the aorta, for three initial hemodynamic conditions: hypotensive, normotensive and hypertensive. As IAP breaches diastolic pressure and rises past it, the aortic flow starts to drop, the upper limb pressure rises and lower limb pressure drops.
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Citation:Gomes VCS, Raghavan ML, Chung TKJ, Gomes J, Silva AQ, et al. (2018) How Intra-Abdominal Pressure Increment Could Affect Cardiovascular Monitoring: A Simulation Assay. J Angiol Vasc Surg 3: 013.
Copyright: © 2018 Gomes VCS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.