Brainstem hypoperfusion in CFS

Brainstem hypoperfusion in CFS.

Sir, Costa and his colleagues {QJ Med 1995; 88:767-73) are to be congratulated for providing more information about chronic fatigue syndrome. Hypocapnia is a powerful and readily available cerebral vasoconstrictor. 1 The 'cerebral vasoconstric-tion, and reduction in cerebral blood flow, are initiated when the arterial pCO 2 has fallen 2 mmHg below normal. When the pCO 2 has fallen by 25 mmHg, c...

Brainstem perfusion in CFS.

Sir, Differences of opinion uncover opportunities for research, and so I do not regret my inability to accept the letter from Dr Costa and his colleagues as an answer to my comments. I agree that mild and moderate hyperventilation can produce vasoconstriction, whereas severe and prolonged hypocapnia does not. Lum has given the reason: in minor respiratory alkalosis the neurone is stimulated, bu...

Implementing CFS

AUDITORY BRAINSTEM RESPONSES (ABR) IN HYPERBILIRUBINEMIC NEWBORNS

To evaluate the changes of ABR values in hyperbilirubinemic newborns, 85 cases with severe jaundice (total bilirubin levels over 16 mg/dL and direct bilirubin less than 2 mg/dL) were selected from those admitted to Children's Medical Center by simple sampling method. These infants had no other problem except jaundice. ABR was taken before treatment in all cases and in some (10 cases) after...

Parallel-CFS - Strengthening the CFS McEliece-Based Signature Scheme

This article presents a modification of the CFS code based signature scheme. By producing two (or more generally i) signatures in parallel, we show that it is possible to protect this scheme from “one out of many” decoding attacks. With this modification, and at the cost of slightly larger signatures, it is possible to use smaller parameters for the CFS signature, thus making this new Parallel-...