This study showed impaired LV contractility in patients with PAH assessed by speckle tracking strain, irrespective of ventricular septal involvement. Global LV longitudinal strain was associated independently with RV fractional area change and tricuspid annular systolic motion, after adjustment for LV ejection fraction.
Como o antimônio é a espécies ativa no medicamento leishmanicida, antimoniato de meglumina (AM), o conhecimento da concentração exata do metal é crítico para o seu uso experimental e clínico. Por outro lado, o papel da cisteína no metabolismo dos antimoniais deve ser esclarecido. No presente trabalho, a reação de redução do Sb V pela cisteína foi caracterizada cineticamente. As ordens de reação com relação ao Sb e à cisteína foram iguais a 1,0 e 3,3, respectivamente. A constante de velocidade da reação de redução foi dependente do pH. Essa reação foi usada para reduzir o Sb V no AM, para subseqüente determinação fotométrica do Sb III com o cromóforo vermelho de bromopirogalol. Eficiências de redução de 100% foram alcançadas em pH 3. Soluções apresentando concentrações de Sb baixas como 0,5 mmol L -1 foram dosadas com sucesso. O método foi também aplicado para a determinação de Sb em formulações lipossomais do AM.Since antimony is the active species in the antileishmanial drug meglumine antimoniate (MA), the knowledge of the exact metal concentration is critical for its experimental and clinical use. On the other hand, the involvement of thiols, such as cysteine (Cys), in the metabolism of this drug remains to be clarified. In the present work, the reduction reaction of Sb V by Cys was kinetically characterized. The reaction orders with respect to Sb and Cys were equal to 1.0 and 3.3, respectively. The rate constant for the reduction reaction was pH-dependent. This reaction was exploited to effectively reduce Sb V in MA, for the subsequent photometric determination of Sb III using the chromogen bromopyrogallol red. Reduction efficiencies of 100% were achieved at pH 3. Solutions with Sb concentration as low as 0.5 mmol L -1 were successfully assayed. The method was also applied to the determination of Sb in liposomal formulations of MA.
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