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Q. Describe U - Waves?
The U-wave is usually upright if the T is also upright and is highest at low rates. When the heart rate increases to more than 90, the U-wave is rarely visible because it merges with the end of the T-wave and the ascending limb of the P-wave. Most of the workers believe that it represents after potentials of the T-wave. The U-wave is accentuated by a larger diastolic volume, hypokalemia and increased digitalis or calcium. Occasionally in patients with very low potassium, the U-wave can become so tall that it is mistaken for a tall T-wave. Patients with inverted U-waves may have an overload of central volume and the tall U-waves may represent a distended papillary muscle. In patients with CAD incidence of inverted or diphasic U-waves is about 30 per cent at rest and 62 per cent after exercise. If one makes an analysis of inverted U-waves, LVH is the most common cause; angina is responsible for about 20 per cent.
Depth and Currents Depth The sea is very deep varying in different regions. Generally life extends to all depths but is confined more to the continental shelf and
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