Most commercial flights, however, fly at 38,000 feet above the Class B maximum height and there is not a specific speed limit imposed. BA Captain Dave Thomas stated why they fly at this height: 'This sort of altitude is a good compromise between engine efficiency and aerodynamic efficiency for jet aircraft.
The most common cause of de Quervainâs tenosynovitis is chronic overuse of the wrist. Repetitive movements day after day cause irritation and pain. One common movement that causes it is lifting a child into a car seat. Another is lifting heavy grocery bags by the handles.
Infectious causes of cerebellar ataxia syndrome may include: Chickenpox. Coxsackie disease (viral infection also called hand-foot-and-mouth disease). Creutzfeldt Jakob disease (rare disease believed to be an infection that causes mental deterioration). Encephalitis or brain abscess (brain inflammation or infection).ther causes of cerebellar ataxia syndrome. Other causes of cerebellar ataxia syndrome may include: Brain tumors. Stroke and other vascular conditions.