CURRENT Diagnosis and Treatment Emergency Medicine by C. Keith Stone, Roger Humphries

By C. Keith Stone, Roger Humphries

The crucial problem-oriented advisor to all illnesses and prerequisites that current to the emergency division -- now up-to-date and expanded!

A Doody's middle name!

  • Concise, actual assurance of universal emergency difficulties, equipped via organ system/anatomic sector -- and supreme to the fast moving ED
  • Cohesive priority-based and problem-based association that stories detailed elements of emergency medication… the administration of universal emergency difficulties… worrying emergencies… and non-trauma emergencies
  • Extensive, at-a-glance algorithms to facilitate fast administration and prognosis
  • Comprehensive desk of substances primary within the ED
  • Exceptional illustrations, together with invaluable ultrasound and CT images

SIXTH version FEATURES:

  • NEW bankruptcy on syncope
  • NEW bankruptcy on seizure
  • NEW bankruptcy on gastrointestinal emergencies
  • NEW bankruptcy on neurologic emergencies
  • Updates of all chapters to mirror the most up-tp-date, functional info at the analysis and therapy of emergency conditions

(20081118)

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Prisms 51 Normal Incidence and Emergence The equations for refraction through a prism and the resulting deviation are simplified if the incident or emergent ray leaves along the normal to the surface or at 0°. ) incident ray normal 1*" fi Y\ Θ 2 = Υ \ ^ ^ * ^ ^ emergent ray normal /θ'ι=γ Figure 3-6. Normal incidence on and normal emergence from a prism. For normal incidence, the incident ray strikes the prism perpendicular to the first refracting surface φι = 0°). Substituting Q1 = 0° into the formulas for refraction through a prism and deviation (Equations 3-1, 3-2, 3-3, 3-5), the following relationships are found: θ1=0° θ\ = 0° γ = θ2 δ = θ' 2 -γ For normal emergence from a prism, the emergent ray leaves the prism perpendic­ ular to the second refracting surface (θ'2 = 0°), resulting in these relationships: θ'2 = 0° θ 2 =0° γ = θ\ δ ^ - γ These relationships are extremely helpful in solving certain prism problems.

The Law of Reflection may be written as an equation: Öi=Ör where: Q{ = the incident angle ΘΓ = the reflected angle (2-3) Laws of Reflection and Refraction 25 Example 2-d A ray is reflected at an interface between water and air at an angle of 25° from the normal. What is the angle of incidence? 00 Angle of reflection: Gr = 25" Unknown Incident angle: Θ = ? Equations/Concepts (2-3) Law of Reflection Simply knowing the relationship between the incident and reflected angles will yield the incident angle.

Using this premise, the internal angles within a parallel-sided medium are equal. In Figure 2-15, Q\ and θ 2 are equal. , the media surrounding the parallel-sided surfaces) are the same, the incident and emergent angles are equal. 00), 9j would equal θ'2. Figure 2-16. Opposite internal angles are equal. 33). If the incident angle is 25°, trace the ray through the aquarium and solve for each of the refracted angles. Show that the emergent angle is equal to the incident angle. Draw to scale a ray traveling through the aquarium.

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