The nurse responding to a low-pressure alarm on the ventilator should assess for which condition?
Disconnection of tubing.
Patient self-extubation.
Patient laying on the tubing.
Patient coughing.
Excessive airway secretions and mucous plugs.
Correct Answer : A,B
Choice A rationale
A disconnection of the ventilator tubing from the patient's airway or from another part of the circuit directly leads to a loss of positive pressure within the system. The ventilator detects this rapid drop in circuit pressure, triggering a low-pressure alarm. This physical separation prevents effective delivery of the set tidal volume and positive end-expiratory pressure, resulting in insufficient ventilation for the patient.
Choice B rationale
Patient self-extubation refers to the accidental or intentional removal of the endotracheal or tracheostomy tube. When this occurs, the connection between the ventilator circuit and the patient's airway is severed. Consequently, the positive pressure generated by the ventilator escapes into the atmosphere, causing a sudden and significant decrease in the circuit pressure, which activates the low-pressure alarm.
Choice C rationale
While a patient laying on the tubing might cause a temporary increase in resistance, it would more likely trigger a high-pressure alarm due to an obstruction or kink in the circuit, which impedes gas flow and increases proximal airway pressure. A low-pressure alarm indicates a leak or disconnection, not an obstruction.
Choice D rationale
Patient coughing can cause a transient increase in intrathoracic pressure and a brief spike in airway pressure within the ventilator circuit. This temporary increase in pressure is more likely to trigger a high-pressure alarm rather than a low-pressure alarm, as it represents a momentary resistance to airflow or expulsion of air.
Choice E rationale
Excessive airway secretions and mucous plugs create an obstruction within the patient's airway or the endotracheal tube. This obstruction increases the resistance to airflow, leading to a build-up of pressure within the ventilator circuit. Therefore, this condition would typically trigger a high-pressure alarm, indicating increased resistance to ventilation, rather than a low-pressure alarm, which signifies a leak or disconnection.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Reverse Trendelenburg positions the patient with the head higher than the feet. While this can reduce venous pressure in the lower extremities, it is not the optimal position for infratentorial tumor resection as it may not adequately facilitate venous drainage from the posterior fossa and could increase pressure on the incision site.
Choice B rationale
Semi-Fowlers position, with the head of the bed elevated to 30-45 degrees, is often used for supratentorial surgeries to promote venous drainage. However, for infratentorial tumor removal, this position can put undue pressure on the operative site due to gravity, potentially leading to complications such as swelling and CSF leakage.
Choice C rationale
Positioning the patient flat on their side is the recommended approach after infratentorial surgery. This position prevents pressure on the incision site and promotes optimal venous and cerebrospinal fluid drainage from the posterior fossa. It also helps to prevent complications such as tentorial herniation and brainstem compression.
Choice D rationale
High Fowlers position, with the head of the bed elevated to 60-90 degrees, is generally contraindicated after infratentorial surgery. This position significantly increases pressure on the posterior fossa incision due to gravity and can compromise cerebral venous outflow, potentially leading to increased intracranial pressure and other neurological deficits.
Correct Answer is ["C","D"]
Explanation
Choice A rationale
Patient self-extubation would typically trigger a low-pressure alarm, not a high-pressure alarm, because the ventilator circuit would no longer be connected to the patient's airway, resulting in a sudden drop in airway pressure and a loss of positive pressure ventilation.
Choice B rationale
Disconnection of the tubes, similar to self-extubation, would lead to a low-pressure alarm due to the loss of a closed circuit. The ventilator would detect a rapid decrease in pressure within the system as air escapes, indicating a leak or complete disconnection.
Choice C rationale
Tube displacement, particularly if the endotracheal tube is pushed deeper into the bronchus or becomes kinked, increases airway resistance. This heightened resistance requires the ventilator to exert more pressure to deliver the set tidal volume, thus triggering a high-pressure alarm.
Choice D rationale
The patient biting the endotracheal (ET) tube creates an occlusion within the airway, significantly increasing airway resistance. This increased resistance makes it harder for the ventilator to deliver breaths, leading to a rapid rise in peak inspiratory pressure and activating the high-pressure alarm.
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