Effect of Cannula Shape on Aortic Wall and Flow Turbulence: Hydrodynamic Study During Extracorporeal Circulation in Mock Thoracic Aorta

Minakawa, Masahito; Fukuda, Ikuo; Yamazaki, Junichi; Fukui, Kozo; Yanaoka, Hideki; Inamura, Tomonari

doi:10.1111/j.1525-1594.2007.00481.x

Cited by 34 publications

(35 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The detailed method of model-making was described in our previous articles. 6,7 The aortic arch model was based on information gleaned from enhanced CT scanning of a 73-year-old patient with an atherosclerotic transverse aortic arch aneurysm. Informed consent was obtained from the patient to use the reconstructed model for the experimental study.…”

Section: Methodsmentioning

confidence: 99%

Hydrodynamic evaluation of axillary artery perfusion for normal and diseased aorta

Minakawa

Fukuda

Inamura

et al. 2008

Gen Thorac Cardiovasc Surg

Self Cite

View full text Add to dashboard Cite

Axillary artery perfusion is an attractive alternative to reduce the frequency of atheroembolism in extensive atherosclerotic aorta and aortic aneurysms. This study was conducted to evaluate the flow dynamics of axillary artery perfusion. Transparent glass models of a normal aortic arch and an aortic arch aneurysm were used to evaluate hydrodynamic properties. Streamline analysis and distribution of the shear stress was evaluated using a particle image velocity method. In the normal aortic arch model, rapid flow of 80 cm/s from the right axillary artery ran out from the brachiocephalic artery and grazed the lesser curvature of the aortic arch. There was secondary reversed flow in the ascending aorta. Flow from left axillary perfusion went straight to the descending aorta. In the aortic arch aneurysm model, flow from both axillary arteries hit the lesser curvature of the aortic arch and went into the ascending aorta with vortical flow. Distribution of shear stress was high along the jet from the ostium of the brachiocephalic artery and left subclavian artery. Flow in the aortic arch and the ascending aorta was unexpectedly rapid. Special care must be taken when the patient has frail atheroma around arch vessels or the lesser curvature of the aortic arch during axillary artery perfusion.

show abstract

Section: Methodsmentioning

confidence: 99%

Hydrodynamic evaluation of axillary artery perfusion for normal and diseased aorta

Minakawa

Fukuda

Inamura

et al. 2008

Gen Thorac Cardiovasc Surg

Self Cite

View full text Add to dashboard Cite

show abstract

“…The impact of pulsatile vs. continuous flows on the local hemodynamics near the graft sites has received less attention. Previous hemodynamic studies on the aortic graft flow focused on either continuous 24,25,42 or pulsatile flow. 30,41 The objective of this study is to compare the effects of pulsatile and continuous flows on the hemodynamics in a pediatric ascending aortic graft model based on patient specific, pediatric aorta morphology.…”

Section: Purposementioning

confidence: 99%

Comparative Study of Continuous and Pulsatile Left Ventricular Assist Devices on Hemodynamics of a Pediatric End-to-Side Anastomotic Graft

Yang

Deutsch

Paterson

et al. 2010

Cardiovasc Eng Tech

View full text Add to dashboard Cite

Although there are many studies that focus on understanding the consequence of pumping mode (continuous vs. pulsatile) associated with ventricular assist devices (VADs) on pediatric vascular pulsatility, the impact on local hemodynamics has been largely ignored. Hence, we compare not only the hemodynamic parameters indicative of pulsatility but also the local flow fields in the aorta and the great vessels originating from the aortic arch. A physiologic graft anastomotic model is constructed based on a pediatric, patient specific, aorta with a graft attached on the ascending aorta. The flow is simulated using a previously validated second-order accurate Navier–Stokes flow solver based upon a finite volume approach. The major findings are: (1) pulsatile support provides a greater degree of vascular pulsatility when compared to continuous support, which, however, is still 20% less than pulsatility in the healthy aorta; (2) pulsatile support increases the flow in the great vessels, while continuous support decreases it; (3) complete VAD support results in turbulence in the aorta, with maximum principal Reynolds stresses for pulsatile support and continuous support of 7081 and 249 dyn/cm2, respectively; (4) complete pulsatile support results in a significant increase in predicted hemolysis in the aorta; and (5) pulsatile support causes both higher time-averaged wall shear stresses (WSS) and oscillatory shear indices (OSI) in the aorta than does continuous support. These findings will help to identify the risk of graft failure for pediatric patients with pulsatile and continuous VADs.

show abstract

“…The velocity mapping and flow images by streamlines were constructed from mean velocity ( U ) and vectors from 30 to 50 consecutive images, whereas the root mean square (rms) value (Urms)(m/s) meaning velocity fluctuation or degree of velocity turbulence was calculated as previously reported (10).…”

Section: Methodsmentioning

confidence: 99%

“…To elucidate shear stress in the flow field, magnitude of the strain rate tensor |D| (1/s) was calculated using the distance and velocity vectors, as calculated by the PIV analysis software (10).…”

Section: Methodsmentioning

confidence: 99%

Hydrodynamics of Aortic Cannulae During Extracorporeal Circulation in a Mock Aortic Arch Aneurysm Model

et al. 2010

Self Cite

View full text Add to dashboard Cite

This study was designed to analyze flow pattern, velocity, and strain on the aortic wall of a glass aortic arch aneurysm model during the extracorporeal circulation, and to elucidate the characteristics of flow pattern in three different aortic cannulae. Different patterns of large vortices and helical flow were made by each cannula. With the curved end-hole cannula, the high velocity flow (approximately 0.6-0.8 m/s) was blowing to the aneurismal wall without attenuating the strain rate tensor (approximately 0.2-0.25/s). With the dispersion cannula and the Soft-Flow cannula, cannular jet was attenuated in the ascending aorta creating a large vortex at a velocity less than 0.5 m/s, and the strain rate tensor on the aneurismal wall was small (less than 0.15/s). In conclusion, end-hole cannula should not be used in the operation of aortic arch aneurysm. Dispersion-type aortic cannulae were less invasive on the aortic arch aneurismal wall, but particular attention to alternative cannulation sites should be paid in cases with severe atherosclerosis on the ascending aortic wall.

show abstract

Effect of Cannula Shape on Aortic Wall and Flow Turbulence: Hydrodynamic Study During Extracorporeal Circulation in Mock Thoracic Aorta

Cited by 34 publications

References 24 publications

Hydrodynamic evaluation of axillary artery perfusion for normal and diseased aorta

Hydrodynamic evaluation of axillary artery perfusion for normal and diseased aorta

Comparative Study of Continuous and Pulsatile Left Ventricular Assist Devices on Hemodynamics of a Pediatric End-to-Side Anastomotic Graft

Hydrodynamics of Aortic Cannulae During Extracorporeal Circulation in a Mock Aortic Arch Aneurysm Model

Contact Info

Product

Resources

About