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Bjork-Shiley Valve (B-S) : This is one of the earliest types of tilting disc valves introduced in early 70's. The earlier models like concavo-convex disc valves were withdrawn from market because of mechanical failure. The monostrut B-S valve was introduced in 1982. It has a pyrolitic carbon disc and cage made of Cobalt-chromium alloy. The disc opens to 70". Anticoagulation and endocarditis prophylaxis are mandatory. Mechanical failure is not reported. This valve is rarely used now.
Q. Determine ST-Segment Elevation? Ans. Exercise induced ST-segment elevation is common in subjects with post MI stress tests in leads where Q-waves are present. It has be
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Determine Water-soluble vitamins needs of school children and adolescents? The suggested requirements are given in Table 15.2 (ICMR 1990). Thiamine is computed as 0.5 mg/1000 K
Some of the reason for increase in population is: 1. Decline in death for an increase in life expectancy or longevity. 2. Better medical facilities
what is an ecosystem energy pathway
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