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Thus the biologies of chronic and intermittent hypoxia differ. Most importantly, in the general population this pulmonary vasoconstrictive response to hypoxia resolves as promptly as http://www.selleckchem.com/products/XL184.html its onset, in response to reoxygenation. So unless it is measured concurrently, a physiologic consequence, e.g., elevation of TJV, could easily escape attention. There are several known, highly likely, potential causes of dynamic PH in the SCD context. Of great concern, multiple HHP studies have found that elevated TJV (and/or its correlates) exhibits significant association with daytime arterial desaturation in SCD, including in children [16,20,23, among others]. Alarmingly SCD children are reported to exhibit sleep-disordered breathing in ?80%, a 4-fold enhanced risk of actually developing nocturnal desaturation http://www.selleck.cn/products/MLN8237.html [182�C185]. One small retrospective analysis reported that presence of daytime desaturation http://www.selleckchem.com/products/CP-690550.html of the elevated pulmonary pressures in SCD subjects. The uniquely complex vascular biology of SCD establishes a state of pre-existing (in terms of any acute event) endothelial dysfunction (described in Consideration #9) [1, 187]. Simulating the particular hazard of this, the NOS3 (eNOS) deficient mouse exhibits dramatically enhanced susceptibility -and exaggerated responsiveness�C to the pulmonary vasoconstrictive effect of hypoxia [188, 189] and NO consumption by cell free Hb [164, 188], and probably to inflammatory signaling [190]. Consistent with this, the PGI2 knockout mouse (prostacyclin deficient) also exhibits exaggerated pulmonary vasoconstrictive response to hypoxia [191]. Thus, in the sickle context, it is predictable that the pathophysiologic response of the endothelium to stimuli would be exaggerated compared to the responses expected from observations on normal patients. The lung is unique among organs in that its arterial tree would be continuously flooded with presickled RBC. So, it perhaps can be predicted that its endothelium would, in turn, be constantly perturbed by the abnormal sickle RBC. Experimentally, it is has been shown that sickle RBC contact with cultured endothelial cells induces an injury response revealed by increased ET1 [192, 193] and TXA2/eicsoanoid/PGI2 [194, 195]. Also, inhibition of endothelium-dependent vasoconstriction has been observed in aortic rings exposed to sickle RBC [196].