A Pumpless Artificial Lung without Systemic Anticoagulation: The Nitric Oxide Surface Anticoagulation System

Author(s):  
Brian P Fallon ◽  
Orsolya Lautner-Csorba ◽  
Alex J Thompson ◽  
Gergely Lautner ◽  
Adrianna Kayden ◽  
...  
Author(s):  
М.Е. Григорьева ◽  
Л.А. Ляпина ◽  
Т.Ю. Оберган

Введение. Метаболический синдром (МС) сопровождается гиперлипемией, гиперкоагуляцией, дисфункцией эндотелия и др. В связи с этим не вызывает сомнений актуальность поиска новых средств комбинированного действия, восстанавливающих как жировой обмен, так и нормальную функцию эндотелия и сосудистотромбоцитарный гемостаз. Цель исследования: изучить в сравнительном аспекте влияние глипролинов ProGlyPro, ProArgPro, ArgProGlyPro и ProGlyProLeu на характеризующие эндотелиальную функцию и состояние сосудистотромбоцитарного гемостаза тканевой активатор плазминогена, уровень конечных метаболитов оксида азота и агрегацию тромбоцитов у крыс с МС. Материалы и методы. Для развития метаболических нарушений крысы получали высококалорийную диету (ВКД). Спустя 6 нед при продолжении ВКД животным интраназально вводили исследуемые пептиды в дозе 50 мкг/кг ежедневно в течение 7 сут. В плазме крови крыс через 20 ч и через 7 сут после последнего введения препаратов определяли показатели системы фибринолиза, АДФагрегацию тромбоцитов, конечные метаболиты оксида азота. Результаты. Развитие МС у крыс приводило к депрессии функции противосвертывающей системы и дисфункции эндотелия. Пролинсодержащие пептиды, применяемые в моделируемых условиях, вызывали активацию антитромбоцитарного звена противосвертывающей системы и эндотелиальной функции. Установлено, что исследуемые глипролины оказывали в кровотоке при их многократном применении выраженные в разной степени однонаправленные изменения в тромбоцитарном гемостазе. Максимальное снижение агрегации тромбоцитов выявлено для ProArgPro. Этот трипептид также в значительной степени активировал сосудистоэндотелиальную функцию путем усиленного выброса в кровоток маркеров тканевого активатора плазминогена и конечных метаболитов оксида азота. Заключение. Наиболее выраженное и устойчивое действие на гемостатическую и эндотелиальную функции в моделируемых условиях у глипролина ProArgPro может быть обусловлено структурными особенностями регуляторных пептидов, а именно, расположением аминокислот аргинина и пролина в непосредственной близости друг от друга. Introduction. Metabolic syndrome (MS) is accompanied by hyperlipemia, hypercoagulability, endothelial dysfunction. The search for new means of combined action, restoring fat metabolism and normal function of the endothelium and platelet hemostasis is relevant. Aim: to study the effect of ProGlyPro, ProArgPro, ArgProGlyPro and ProGlyPro Leu on tissue plasminogen activator, level of final nitric oxide metabolites and platelet aggregation in MS rats. Materials and methods. Rats received a highcalorie diet for the development of MS. After 6 weeks, the peptides were administered intranasally to animals at a dose 50 g/kg daily for 7 days. Parameters of fibrinolysis system, ADPplatelet aggregation, and final metabolites of nitric oxide were determined in rat blood plasma 20 hours and 7 days after the last drugs administration. Results. The development of MS in rats led to depression of anticoagulation system and endothelial dysfunction. Prolinecontaining peptides in simulated conditions caused activation of anticoagulation system and endothelial function. The studied peptides with their repeated use led in the bloodstream to unidirectional changes of varying degrees in platelet haemostasis after their multiple intranasal applications to animals. The maximum reduction in platelet aggregation was detected for ProArgPro. This tripeptide significantly increased the levels of final metabolites of nitric oxide and tissue plasminogen activator. Conclusion. The most pronounced and stable effect on hemostatic and endothelial functions in simulated conditions was identified for ProArgPro. Perhaps this effect is due to the structural characteristics of peptides, namely, the position of arginine in close proximity of proline.


1998 ◽  
Vol 26 (1) ◽  
pp. 67-69 ◽  
Author(s):  
B. Carter ◽  
M. Holt ◽  
J. Tibballs ◽  
M. Hochmann ◽  
A. Osborne

We examined the ability of a new combined nitric oxide (NO)/nitrogen dioxide (NO2) electrochemical analyser (PrinterNOx, Micro Medical Limited, Chatham, Kent, England) to measure NO and NO2 concentrations. The PrinterNOx was compared to a chemiluminescence analyser (42H, Thermo Environmental Instruments Inc, Franklin MA, U.S.A.). NO and NO2 were generated in a standard ventilator circuit using a paediatric ventilator (900C, Siemens Elema, Sweden) connected to an artificial lung (260li, TTL Test Lung, Michigan Instruments, MI, U.S.A.). Forty-four paired NO measurements ranging from 2.56 ppm to 74.6 ppm and 50 paired NO2 measurements ranging from 0.0 ppm to 5.39 ppm were obtained. For the measurement of NO the PrinterNOx showed a tendency to overestimate the chemiluminescence analyser. Regression analysis showed a close relationship between the two analysers with r2=0.9981 and a regression equation of y=1.1658 x +0.0197. In the more clinically important range of 0-25 ppm, r2 increased to 0.9996 with a regression equation of y=1.1984 x -0.4657. Conversely the PrinterNOx underestimated the chemiluminescence analyser for the measurement of NO2. The regression equation describing this relationship was y=0.879 x -0.0447 (r2=0.9993). We conclude that the PrinterNOx is of sufficient accuracy to be of clinical use in the administration of NO.


Biomaterials ◽  
2012 ◽  
Vol 33 (27) ◽  
pp. 6305-6312 ◽  
Author(s):  
Scott P. Nichols ◽  
Ahyeon Koh ◽  
Nga L. Brown ◽  
Michael B. Rose ◽  
Bin Sun ◽  
...  

2019 ◽  
Vol 90 ◽  
pp. 122-131 ◽  
Author(s):  
Angela Lai ◽  
Caitlin T. Demarest ◽  
Chi Chi Do-Nguyen ◽  
Rei Ukita ◽  
David J. Skoog ◽  
...  

ASAIO Journal ◽  
2005 ◽  
Vol 51 (2) ◽  
pp. 51A
Author(s):  
David M Somand ◽  
Felicia A Ivascu ◽  
Amy M Skrzypchak ◽  
Robert H Bartlett ◽  
Ronald B Hirschl

Author(s):  
R. R. Dils ◽  
P. S. Follansbee

Electric fields have been applied across oxides growing on a high temperature alloy and control of the oxidation of the material has been demonstrated. At present, three-fold increases in the oxidation rate have been measured in accelerating fields and the oxidation process has been completely stopped in a retarding field.The experiments have been conducted with an iron-base alloy, Pe 25Cr 5A1 0.1Y, although, in principle, any alloy capable of forming an adherent aluminum oxide layer during oxidation can be used. A specimen is polished and oxidized to produce a thin, uniform insulating layer on one surface. Three platinum electrodes are sputtered on the oxide surface and the specimen is reoxidized.


Author(s):  
Chi-Ming Wei ◽  
Margarita Bracamonte ◽  
Shi-Wen Jiang ◽  
Richard C. Daly ◽  
Christopher G.A. McGregor ◽  
...  

Nitric oxide (NO) is a potent endothelium-derived relaxing factor which also may modulate cardiomyocyte inotropism and growth via increasing cGMP. While endothelial nitric oxide synthase (eNOS) isoforms have been detected in non-human mammalian tissues, expression and localization of eNOS in the normal and failing human myocardium are poorly defined. Therefore, the present study was designed to investigate eNOS in human cardiac tissues in the presence and absence of congestive heart failure (CHF).Normal and failing atrial tissue were obtained from six cardiac donors and six end-stage heart failure patients undergoing primary cardiac transplantation. ENOS protein expression and localization was investigated utilizing Western blot analysis and immunohistochemical staining with the polyclonal rabbit antibody to eNOS (Transduction Laboratories, Lexington, Kentucky).


2001 ◽  
Vol 28 (5-6) ◽  
pp. 459-462
Author(s):  
Pini Orbach ◽  
Charles E Wood ◽  
Maureen Keller-Wood
Keyword(s):  

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