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In mathematics, the supersilver ratio is a geometrical proportion close to 75/34. Its true value is the real solution of the equation x 3 = 2 x 2 + 1. The name supersilver ratio results from analogy with the silver ratio , the positive solution of the equation x 2 = 2 x + 1 , and the supergolden ratio .
The strongest predictors of an upper gastrointestinal bleed are black stool, age <50 years, and blood urea nitrogen/creatinine ratio 30 or more. [8] [9] The diagnosis of upper gastrointestinal bleeding is assumed when hematemesis (vomiting of blood) is observed. [citation needed]
Murphy's sign has a high sensitivity and negative predictive value, although the specificity is not high. [2] However, in the elderly the sensitivity is markedly lower; a negative Murphy's sign in an elderly person is not useful for ruling out cholecystitis if other tests and the clinical history suggest the diagnosis.
Cholecystitis accounts for 3–10% of cases of abdominal pain worldwide. [43] Cholecystitis caused an estimated 651,829 emergency department visits and 389,180 hospital admissions in the US in 2012. [44] The 2012 US mortality rate was 0.7 per 100,000 people. [44] The frequency of cholecystitis is highest in people age 50–69 years old. [43]
Cholecystectomy is the surgical removal of the gallbladder.Cholecystectomy is a common treatment of symptomatic gallstones and other gallbladder conditions. [1] In 2011, cholecystectomy was the eighth most common operating room procedure performed in hospitals in the United States. [2]
Perioperative nursing is a nursing specialty that works with patients who are having operative or other invasive procedures. Perioperative nurses work closely with surgeons , anaesthesiologists , nurse anaesthetists , surgical technologists , and nurse practitioners .
In mathematics, two sequences of numbers, often experimental data, are proportional or directly proportional if their corresponding elements have a constant ratio. The ratio is called coefficient of proportionality (or proportionality constant) and its reciprocal is known as constant of normalization (or normalizing constant).
The ratio of width to height of standard-definition television. In mathematics, a ratio (/ ˈ r eɪ ʃ (i) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3).