Pentoxifylline is a trisubstituted xanthine derivative designated chemically as l-(5-oxohexyl)-3, 7-di- methylxanthine with rheologic and vasomotor effects. It has been shown to decrease blood viscosity by increasing erythrocyte deformability, reducing platelet aggregation, and promoting thrombolysis. It also causes vasodilation. The drug is currently used in patients with peripheral vascular disease to increase blood perfusion and improve oxygen delivery. In addition, pentoxifylline has been reported to increase the cardiac index and there is preliminary evidence that it can reduce hypoxia-induced pulmonary vasoconstriction.
We hypothesized that the net effect of this constellation of pharmacologic properties would improve gas exchange in patients with chronic obstructive pulmonary disease (COPD) and we tested this hypothesis in a small group of healthy subjects and volunteers with COPD at rest, during, and immediately after exercise. kamagra tablets