Time-Resolved Micro PIV in the Pivoting Area of the Triflo Mechanical Heart Valve

The Lapeyre-Triflo FURTIVA valve aims at combining the favorable hemodynamics of bioprosthetic heart valves with the durability of mechanical heart valves (MHVs). The pivoting region of MHVs is hemodynamically of special interest as it may be a region of high shear stresses, combined with areas of flow stagnation. Here, platelets can be activated and may form a thrombus which in the most severe case can compromise leaflet mobility. In this study we set up an experiment to replicate the pulsatile flow in the aortic root and to study the flow in the pivoting region under physiological hemodynamic conditions (CO = 4.5 L/min / CO = 3.0 L/min, f = 60 BPM). It was found that the flow velocity in the pivoting region could reach values close to that of the bulk flow during systole. At the onset of diastole the three valve leaflets closed in a very synchronous manner within an average closing time of 55 ms which is much slower than what has been measured for traditional bileaflet MHVs. Hot spots for elevated viscous shear stresses were found at the flanges of the housing and the tips of the leaflet ears. Systolic VSS was maximal during mid-systole and reached levels of up to 40 Pa.

Management of floating thrombus in the aortic arch

OBJECTIVE Floating aortic thrombus is an underrecognized source of systemic emboli and carries a life-threatening risk of stroke when located in the aortic arch. Optimal treatment is not established in available guidelines. We report our experience in managing floating thrombi in the aortic arch. METHODS Consecutive patients diagnosed with a floating aortic arch thrombus at a tertiary referral center between January 2008 and December 2014 were reviewed. Perioperative and midterm outcomes were assessed. RESULTS Ten patients (8 female) with a median age of 56 years (range, 47-82 years) were identified. Eight patients presented with a symptomatic embolic event, and 2 patients were asymptomatic. One patient presenting with stroke due to embolic occlusion of all supra-aortic vessels died 2 days after admission. Three patients (2 asymptomatic and 1 unfit for surgery) were treated conservatively by anticoagulation, leading to thrombus resolution in 2 patients. In the third patient, the thrombus persisted despite anticoagulation, resulting in recurrent embolic events. The remaining 6 patients underwent open thrombectomy of the aortic arch during deep hypothermic circulatory arrest. All patients treated by surgery had an uneventful postoperative course with no recurrent thrombus or embolic event during follow-up. Median follow-up of all patients was 17 months (range, 11-89 months). CONCLUSIONS Floating aortic arch thrombus is a dangerous source of systemic emboli. Surgical removal of the thrombus is easy to perform and followed by good clinical results. Conservative treatment with anticoagulation may be considered in asymptomatic, inoperable or high-risk patients.

Analysis and design of the log-periodic dipole antenna.

At head of title: Antenna Laboratory.

The characteristic impedance of the fin antenna of infinite length /

"Contract No. AF33(616)-3220 Project No. 6(7-4600) Task 40572 Wright Air Development Center"

Logarithmically periodic resonant-v arrays /

"Contract AF33(616)-6079 Project No. 9-(13-6278) Task 40572. Sponsored by: Wright Air Development Center"

Istorīi︠a︡ kontr-revoli︠u︡t︠s︡īi v Anglīi pri Karli︠e︡ II i Īakovi︠e︡ II ...

Mode of access: Internet.

Oeuvres de P.-L. Courier /

Mode of access: Internet.

OEuvres complètes de P.L. Courier.

"Périclès, traduction libre et abrégé de Plutarque": p. 215-229.

Oeuvres complètes de P. L. Courier.

Incluye facsimil de la mancha de tinta hecha por P. L. Courier en el manuscrito de Daphnis & Chloe.

Oeuvres complètes de P. L. Courier.

Mode of access: Internet.

Œuvres de Maximilien Robespierre, avec une notice historique, des notes et des commentaires,

Mode of access: Internet.

Mémoire sur les moyens qui peuvent conduire a l'indépendance italienne /

Author identity verified in Barbier, A. A. Dictionnaire des ouvrages anonymes, 1872-1879, v.3, p. 174.

Résumé de l'histoire des Grecs modernes, depuis l'envahissement de la Grèce par les Turcs jusqu' aux derniers événemens de la révolution actuelle.

Mode of access: Internet.

FIU Medical Library Cubicles

http://digitalcommons.fiu.edu/com_images/1094/thumbnail.jpg

Normative reference values for the 20-meter shuttlerun test in a population-based sample of schoolchildren in Bogota, Colombia: The FUPRECOL Study

Our aim was to determine the normative reference values of cardiorespiratory fitness (CRF) and to establish the proportion of subjects with low CRF suggestive of future cardio-metabolic risk.