Intra-Supra Annular Aortic Valve and Complete Supra Annular Aortic Valve: A Literature Review and Hemodynamic Comparison

Zhang, M; Qc, Wu

doi:10.1177/145749691009900107

Cited by 8 publications

(6 citation statements)

References 17 publications

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“…This is in accordance with the adequate sizing of the effective orifice area criteria so that residual stenosis after valve implantation can be avoided, thereby minimizing the occurrence of elevated pressure gradients through the valve [ 19 ] . On the other hand, the occurrence of unsatisfactory pressure gradient across the prosthesis should also be avoided, as it would result in an incomplete reduction of the left ventricular hypertrophy [ 20 , 21 ] . Manufacturers have developed models of valves for different sutures without addressing controversies about the proper diameter of the prosthesis according to the patient's aortic annulus [ 19 , 20 ] and relying on the experience of clinical practice favoring hemodynamic performance.…”

Section: Discussionmentioning

confidence: 99%

“…The AGN 21 - 751 (Regent TM ) model is designed for supra-annular suture and the AJ 21 - 501 (Masters Series) model for intra-annular suture. Currently, due to hemodynamic advantages, most surgeons employ the supra-annular positioning, even if there is a discrepancy among manufacturers regarding different internal diameter of the prostheses based on valves with the same nominal diameter [ 20 - 22 ] . For the prostheses studied here, which are from the same manufacturer, the choice of supra-annular prosthesis implies a valve with a larger inner diameter, although the two models have the same nominal diameter (21 mm).…”

Section: Discussionmentioning

confidence: 99%

“…In fact, smaller peak velocities and a better hydrodynamic behavior were observed for all measurements of the supra-annular prosthesis 21 AGN - 751 (RegentTM) points of interest ( Figures 6 to 8 ). However, it is not possible to disregard some surgical priorities that can be more relevant in some cases than the hydrodynamic aspects for a certain group of patients [ 20 ] .…”

Section: Discussionmentioning

confidence: 99%

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Laser Doppler anemometry measurements of steady flow through two bi-leaflet prosthetic heart valves

Bazan¹,

Ortiz²,

Junior³

et al. 2013

Revista Brasileira De Cirurgia Cardiovascular

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IntroductionIn vitro hydrodynamic characterization of prosthetic heart valves provides important information regarding their operation, especially if performed by noninvasive techniques of anemometry. Once velocity profiles for each valve are provided, it is possible to compare them in terms of hydrodynamic performance. In this first experimental study using laser doppler anemometry with mechanical valves, the simulations were performed at a steady flow workbench.Objective To compare unidimensional velocity profiles at the central plane of two bi-leaflet aortic prosthesis from St. Jude (AGN 21 - 751 and 21 AJ - 501 models) exposed to a steady flow regime, on four distinct sections, three downstream and one upstream. MethodsTo provide similar conditions for the flow through each prosthesis by a steady flow workbench (water, flow rate of 17L/min. ) and, for the same sections and sweeps, to obtain the velocity profiles of each heart valve by unidimensional measurements. ResultsIt was found that higher velocities correspond to the prosthesis with smaller inner diameter and instabilities of flow are larger as the section of interest is closer to the valve. Regions of recirculation, stagnation of flow, low pressure, and flow peak velocities were also found. Conclusions Considering the hydrodynamic aspect and for every section measured, it could be concluded that the prosthesis model AGN 21 - 751 (RegentTM) is superior to the 21 AJ - 501 model (Master Series). Based on the results, future studies can choose to focus on specific regions of the these valves.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Laser Doppler anemometry measurements of steady flow through two bi-leaflet prosthetic heart valves

Bazan¹,

Ortiz²,

Junior³

et al. 2013

Revista Brasileira De Cirurgia Cardiovascular

View full text Add to dashboard Cite

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“…Суть операции Озаки заключается в следующем: замене трех натив ных аортальных створок аутологичным пе рикардом, обработанным глутаральдегидом. Одно из преимуществ этого метода -удовле творительные градиенты на клапане при од новременном обеспечении более эффектив ной площади отверстия клапана [5]. Однако этот метод требует большого перикардиаль ного лоскута размером не менее 7×8 см, что обычно влечет за собой необходимость пол ной стернотомии для выделения.…”

Section: Introductionunclassified

Minimally invasive Ozaki procedure for aortic valve disease, preliminary results

et al. 2021

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Objective. To assess the efficiency and realizability of the surgical technique of aortic valve reconstruction using autologous pericardium treated by glutaraldehyde in different aortic valve diseases such as aortic stenosis, aortic regurgitation, rheumatic and degenerative diseases of aortic valve. In 2014, Ozaki presented the technique described. Materials and methods. In this work we analysed 10 cases of ministernomy combined with Ozaki procedure in patients operated at Sukhanov Federal Center for Cardiovascular Surgery. Results. No hospital mortality was registered in our study. Intraoperatively, transition to a full sternotomy was not required. A mean time of aortic cross-clamping was 84.6 ( 14.4) minutes, a mean value of artificial circulation was 103.1 ( 17.7) minutes, a mean time of ventilation was 8.4 hours, and a mean time of staying in intensive care unit room was 1.6 days. Conclusions. Minimally invasive approach combined with Ozaki procedure is realizable; it is an alternative to conventional sternotomy and should be used for patients in grave condition having concomitant diseases.

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“…Стремление к оптимизации показателей гемодинамики привело к созданию проте зов, предназначенных для супрааннулярной (надкольцевой) их установки. Супраанну лярные протезы были сконструированы для размещения опорного кольца протеза над фиброзным кольцом клапана, тем самым увеличивая эффективную площадь отверстия и облегчая торможение обратного кровото ка [4]. В одном исследовании сообщалось, что матрацный шов в сочетании с супраан нулярным позиционированием протеза обеспечивают превосходную гемодинамику [5].…”

Section: Introductionunclassified

Influence of suture technique in aortic valve replacement on occurrence of "Prosthesis-Patient" mismatch

et al. 2021

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Objective. To determine the suture technique, which provides better hemodynamic indices in aortic valve replacement. Aortic valve AV) pathology is a widespread pathology among elderly persons and since the share of them increases every year, the number of surgeries for AV replacement is growing. Many factors can influence the hemolytic characteristics of AV prosthesis including construction of cusps and supporting ring. Suture technique can also influence the hemodynamic results of AV replacement. Conventional technique for attaching mechanical valve is an interrupted sealing suture. Materials and methods. Patients who underwent AV prosthetics isolated prosthetics, prosthetics combined with coronary artery bypass grafting, with mitral valve repair, tricuspid valve repair or aortic prosthetics) over the period from January 2015 to September 2018 were studied. All statistical calculations were fulfilled using IBM SPSS Statistics 23.0 IBM Corp., Armonk, NY). Results. Altogether, from January 2015 to September 2018, 439 patients underwent AV prosthetics; 321 patient 73.1 %) underwent isolated AV replacement. Unsealed technique had less frequency of occurrence of prosthesis-patient" mismatch PPM), especially in the small aortic ring compared with the other suturing techniques. The suture type was the following: sealing and figure-of-eight suture and the number of sutures more than 16 were the risk factors for moderate and severe PPM in logistic regressive analysis; the suture technique was an independent risk factor for moderate and severe PPM. Conclusions. An interrupted mattress unsealed suture permits to implant the AV prosthesis on the native fibrous ring of the valve with less frequency of occurrence of prosthesis-patient" mismatch and promotes improvement of hemodynamics in patients with a small fibrous ring of the aortic valve.

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Intra-Supra Annular Aortic Valve and Complete Supra Annular Aortic Valve: A Literature Review and Hemodynamic Comparison

Cited by 8 publications

References 17 publications

Laser Doppler anemometry measurements of steady flow through two bi-leaflet prosthetic heart valves

Laser Doppler anemometry measurements of steady flow through two bi-leaflet prosthetic heart valves

Minimally invasive Ozaki procedure for aortic valve disease, preliminary results

Influence of suture technique in aortic valve replacement on occurrence of "Prosthesis-Patient" mismatch

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