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.
The most frequent complications for De Quervain's tendonitis are: 1  Numbness over the back of the thumb and hand. In many patients, the superficial radial nerve lies right over the tendons. 2  Subluxation of the tendons. As you move your wrist, you may experience a snapping sensation over the thumb side of your wrist. 3  Infection.