Exam 3: Classification of Mechanical Ventilators

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The ____ is the system that governs or controls the ventilator drive mechanism or output control valve.

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Which of the following waveforms are characteristically produced by ventilators having a rotary-driven piston drive mechanism?

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C

Describe the four types of flow waveforms.

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The rectangular waveform is produced when volume is the control variable and the output is an ascending ramp. The flow waveform (a derivative of the volume waveform with respect to time), assumes the characteristic rectangular shape. The ramp waveform can be ascending or descending. If flow rises as the breath is delivered, it is termed ascending. If flow falls during the ventilator-supported breath, it is called a descending ramp. The sinusoidal waveform resembles the positive portion of a sine wave. It is generated by a rotary-driven piston drive mechanism.

Describe inspiration and expiration.

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_______________ proposed a new way to classify mechanical ventilators based on related features, physics, and engineering.

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A ____ breath is initiated and delivered by the ventilator when it senses the patient's spontaneous inspiratory effort.

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A negative pressure ventilator applies pressure inside the chest to expand it.

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Automatic tube compensation is active both during inspiration and expiration, and may reduce air trapping and _______________.

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Which of the following flow waveforms is produced when volume is the control variable and the output is an ascending ramp?

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_______________ alert the clinician to settings or parameters that are not within acceptable ranges or specifications, or they warn the clinician that the ventilator has failed some part of a self-diagnostic test.

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A resistance load is proportional to ____.

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Flow triggering has been shown to be more sensitive and responsive to a patient's efforts than pressure triggering.

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____ are ventilators that measure and control inspiratory and expiratory time.

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The type of drive mechanism determines the characteristic flow and pressure patterns each ventilator produces.

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____ is defined as a change in volume divided by a change in pressure.

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Explain the advantage of both pressure-controlled ventilation and volume-controlled ventilation.

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____ is a time-triggered, pressure-limited and time cycled mode that allows for spontaneous breathing.

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Discuss Robert Chatburn's ventilator classification system.

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Which of the following types of control circuits may also be referred to as servo controlled?

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____ alarms alert the clinician to changes in oxygen concentration or gas temperature.

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