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PRACTICE TEST: BASIC TEE
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Which of the following is a characteristic of ultrasound?
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a) Travels at a constant speed, regardless of the medium
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b) Can travel in a vacuum
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c) Composed of longitudinal waves
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d) Produces net particle displacement on the medium
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(c). Ultrasound travels as a series of longitudinal pressure waves without net particle displacement of the medium. It cannot travel in a vacuum, and its speed is different in different media.
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Which of the following statements is true regarding ultrasound?
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a) Ultrasound waves have a frequency greater than 0.02 MHz
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b) Imaging transducers have frequencies of 20 to 30 MHz
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c) Frequency is directly proportional to wavelength
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d) Frequency is determined by the medium through which sound is traveling
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(a). Ultrasound waves have frequencies greater than 0.02 MHz, or 20,000 Hz. Remember that MHz is a 106 multiple. Imaging transducers usually range from 3.5 to 12 MHz, and frequency is inversely proportional to wavelength.
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Which of the following tissues has the lowest speed of propagation for ultrasound waves?
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(e). The lung has the lowest speed for conduction of sound (500 m/s approximately). This is because lung fields primarily represent air. Recall that the speed of sound is slowest in air and progressively faster in stiffer materials.
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Which of the following is an absolute contraindication for TEE?
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b) Bleeding esophageal varices
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Of all the options the only absolute contraindication is active upper gastrointestinal bleeding (b); the rest of them are relative contraindications.
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The small wheel on the TEE probe controls which of the following probe motions?
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c) Turn to the right/left
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