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Beta-blockers may lower or increase glucose levels when used alone. When used with sulfonylureas, beta-blocking drugs may interfere with glucose lowering by the sulfonylureas. In addition, beta-blockers can blunt some of the body's protective responses to hypoglycemia, for example, increased heart rate, thus making it difficult for patients to recognize hypoglycemia. This notwithstanding, beta-blockers have been used successfully in diabetic patients and have been associated with improved survival in diabetics with high blood pressure . Is chlorpropamide safe to take if I'm pregnant or breastfeeding?
A propeller that turns clockwise to produce forward thrust, when viewed from aft, is called right-handed. One that turns anticlockwise is said to be left-handed. Larger vessels often have twin screws to reduce heeling torque , counter-rotating propellers , the starboard screw is usually right-handed and the port left-handed, this is called outward turning. The opposite case is called inward turning. Another possibility is contra-rotating propellers , where two propellers rotate in opposing directions on a single shaft, or on separate shafts on nearly the same axis. Contra-rotating propellers offer increased efficiency by capturing the energy lost in the tangential velocities imparted to the fluid by the forward propeller (known as "propeller swirl"). The flow field behind the aft propeller of a contra-rotating set has very little "swirl", and this reduction in energy loss is seen as an increased efficiency of the aft propeller.