کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4211503 1280643 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hypoxia-induced pulmonary hypertension: Different impact of iloprost, sildenafil, and nitric oxide
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی پزشکی ریوی و تنفسی
پیش نمایش صفحه اول مقاله
Hypoxia-induced pulmonary hypertension: Different impact of iloprost, sildenafil, and nitric oxide
چکیده انگلیسی

SummaryObjectivesChronic alveolar hypoxia induces pulmonary hypertension, evident from elevated pulmonary artery pressure (PAP), pulmonary vascular resistance, right ventricular hypertrophy (RVH), and increased muscularization of the pulmonary vasculature. Additionally, the vasoconstrictor response to acute hypoxia (HPV) may be reduced in the remodeled vasculature. However, no direct comparison of different treatments on the various parameters characterizing pulmonary hypertension has been performed yet. Against this background, we compared the effects of inhaled NO, infused iloprost, a stable prostacyclin analogue, and oral sildenafil, a phosphodiesterase 5 inhibitor, on hypoxia-induced pulmonary hypertension.MethodsExposure of rabbits to chronic hypoxia (FiO2=0.10) for 42 days. Treatment with infused iloprost, oral sildenafil, and inhaled nitric oxide.ResultsWe quantified PAP, pulmonary vascular resistance, RVH, vascular remodeling, vasoreactivity, and the strength of HPV. Chronic hypoxia resulted in an increase in (a) the right ventricle/(left ventricle+septum) ratio from 0.26±0.01 to 0.44±0.01, (b) PAP, and (c) the degree of muscularization from 14.0±4.0% to 43.5±5.3%. Treatment with iloprost and sildenafil, but not with NO, prevented the increase in muscularization. In contrast, RVH was strongly inhibited by sildenafil, whereas NO had some minor, and iloprost had no effect. Only iloprost reduced PAP compared to NO and sildenafil. The downregulation of HPV was abrogated only by NO.ConclusionWe demonstrated (a) that the parameters characterizing hypoxia-induced pulmonary hypertension are not functionally linked, (b) that the downregulation of HPV under chronic hypoxia can be prevented by inhaled NO but not by sildenafil and iloprost, and (c) that iloprost is particularly effective in preventing vascular remodeling and sildenafil in preventing RVH.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Respiratory Medicine - Volume 101, Issue 10, October 2007, Pages 2125–2132
نویسندگان
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