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Cerebral hyperperfusion syndrome (CHPS) is a rare
disease with complications of carotid artery revascularization. Acute retinal
hemorrhage is a very rare entity that has been previously described as a manifestation
of CHPS followed by the carotid artery stenting (CAS), but to the best of our
knowledge, not yet described as a complication of carotid surgery. An Ascending
Aorta to bilateral Carotid bypass was performed in a 35 years old woman with
active Takayasu arteritis and 95% symptomatic stenosis of both common carotid
arteries. Severe retinal hemorrhage appeared on the second post operative day
combined with high blood pressure, brain edema on CT scan and grand mal
seizures. It seems that fundoscopic examination followed by the carotid
revascularization of tightness can be helpful in identifying those patients
who develop symptoms suggesting of CHPS.
This paper presents two new non-iterative approximations of the power flow in a network. Real and reactive power are simultaneously modelled in complex equations. Also, resistances are not set to zero. This is a generalization of the DC approximation, where only real power is modelled with zero line resistance. Hence the proposed approximations are more accurate than the DC approximation. The voltage lag over a link in a short, low voltage, network link is ten times as accurate as with the DC approximation. In the Appendix a new mathematical constant is introduced.