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NBRC Certified Respiratory Therapist - Reviews


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See why our users from 154 countries love us for their exam prep! Including 200 reviews for the NBRC CRT exam.

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NBRC Certified Respiratory Therapist - Test Reviews Sample Questions

If you have a patient who relies on a hypoxic respiratory drive, you would use which of the following types of oxygen delivery devices which is designed to deliver O2 concentrations of 30% to 40%?

Correct Answer:
venturi mask


the correct choice of oxygen delivery device for a patient who relies on a hypoxic respiratory drive is crucial in ensuring that their oxygen needs are met without causing potential harm. patients with chronic obstructive pulmonary disease (copd) and certain other conditions often rely on a hypoxic drive to breathe. in such patients, administering too much oxygen can suppress their natural respiratory drive, leading to a decrease in respiratory rate and potentially life-threatening situations.

among the options provided, the venturi mask is specifically designed to deliver precise concentrations of oxygen, typically ranging from 24% to 50%. this feature makes it the ideal choice for patients who rely on a hypoxic respiratory drive. the ability to control the fraction of inspired oxygen (fio2) is crucial for these patients to avoid the risk of hyperoxia, which can suppress their natural urge to breathe.

the mechanism of the venturi mask involves using a specific adaptor with different sized nozzles or entrainment ports that allows a fixed amount of air to mix with oxygen, thus controlling the concentration of oxygen delivered. it uses the bernoulli principle and venturi effect to draw in ambient air through these ports, which mixes with the pure oxygen coming from the oxygen supply. this results in a more predictable and accurate fio2 compared to other masks.

in contrast, other masks such as the nonrebreather mask, partial rebreather mask, and simple face mask do not offer the same level of precision in oxygen delivery. a nonrebreather mask is designed for higher concentrations of oxygen (typically 60% to 100%), which can be dangerous for patients with a hypoxic drive. similarly, partial rebreather and simple masks do not allow precise control over the oxygen concentration, making them unsuitable for patients who require controlled oxygen therapy.

therefore, for a patient with a dependency on a hypoxic respiratory drive, the venturi mask is the most appropriate choice among the given options. it ensures the delivery of a controlled amount of oxygen, which is critical in managing their respiratory status effectively without compromising their natural breathing mechanisms.

In order to assist the patient in breathing when he or she is experiencing angina pectoris or myocardial infarction which of the following positions is most helpful?

Correct Answer:
semi- or high fowler position
in order to assist a patient in breathing when experiencing angina pectoris or a myocardial infarction, the most helpful position is the semi- or high fowler position.

the semi- or high fowler position involves having the patient sit in a bed or on another surface with the head of the bed raised between 30 to 90 degrees. this positioning utilizes gravity to help reduce the workload on the heart and improve the efficiency of the lungs. by elevating the upper body, this position can help enhance oxygenation and make breathing easier for patients who might be experiencing shortness of breath due to heart issues.

angina pectoris and myocardial infarction both reduce the efficiency of the heart's pumping action due to inadequate blood supply to the heart muscle itself. this inefficiency can lead to congestion in the lungs, as the heart is unable to effectively move blood through the pulmonary and systemic circulations. by sitting up, the patient may experience less pressure in the lungs, a decrease in venous return to the heart, and reduced pulmonary congestion, thereby easing breathing.

furthermore, the semi- or high fowler position can minimize the negative effects of fluid accumulating in the lungs, a condition known as pulmonary edema, which is a common complication of heart failure and myocardial infarction. this position helps to distribute fluids more evenly and reduces the likelihood of fluid buildup in the lung tissues.

it is important to note that if positive pressure ventilation is being provided, or if the patient is experiencing frank hypotension (very low blood pressure), adjustments may need to be made. under these circumstances, the patient might need to be placed in a supine (lying flat on the back) position to manage these specific conditions effectively. the supine position can sometimes help in maintaining blood pressure and is necessary for certain medical interventions.

in summary, the semi- or high fowler position is generally recommended for patients suffering from angina pectoris or myocardial infarction to aid in breathing and to manage or prevent complications associated with these cardiac events. however, the patient's overall condition and specific medical requirements should always guide the choice of positioning.