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
Decreasing the respiratory rate would cause retention of carbon dioxide (CO2), a respiratory acid. This would further exacerbate the existing metabolic acidosis by adding a respiratory acid component, making the overall acidosis more severe and less compensated, which is counterproductive.
Choice B rationale
Increasing the renal retention of H+ would worsen the acidosis. The kidneys normally excrete H+ ions to regulate pH. Retaining more H+ would lead to a further decrease in pH, contributing to the acidic state rather than compensating for it, which is the opposite of the body's compensatory mechanism.
Choice C rationale
In metabolic acidosis, the body attempts to compensate by increasing the respiratory rate and depth. This hyperventilation leads to an increased elimination of carbon dioxide (CO2) from the lungs. By blowing off CO2, the body reduces carbonic acid levels, thereby increasing the pH towards the normal range.
Choice D rationale
Decreasing the renal reabsorption of HCO3- would also worsen metabolic acidosis. Bicarbonate (HCO3-) is a primary buffer in the blood, and its reabsorption by the kidneys is crucial for maintaining pH balance. Reducing its reabsorption would lead to greater bicarbonate loss and a further drop in pH.
Correct Answer is D
Explanation
Choice A rationale
Bradycardia, a slow heart rate (typically below 60 beats per minute in adults), is a key component of Cushing's triad. It results from the body's compensatory response to increased intracranial pressure, where systemic hypertension triggers a reflex vagal response, leading to a decrease in heart rate.
Choice B rationale
Widening pulse pressure, defined as an increasing difference between systolic and diastolic blood pressure, is a hallmark of Cushing's triad. This occurs as the body attempts to maintain cerebral perfusion pressure by increasing systolic pressure against a relatively stable or slightly decreased diastolic pressure due to peripheral vasodilation.
Choice C rationale
Hypertension, specifically systolic hypertension, is a crucial component of Cushing's triad. It reflects the body's physiological attempt to overcome increased intracranial pressure and maintain adequate cerebral blood flow by increasing systemic arterial pressure, ensuring perfusion to the brain.
Choice D rationale
Hypothermia, a core body temperature below 35°C (95°F), is not a recognized component of Cushing's triad. Cushing's triad specifically describes a set of physiological responses to increased intracranial pressure: bradycardia, hypertension, and widening pulse pressure, all related to cardiovascular and respiratory regulation.
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