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Question 1
Which ECG finding is most associated with a myocardial infarction?
Correct Answer:
Significant Q waves
Explanation:
Pathologic Q waves reflect irreversible myocardial necrosis from an infarction. When tissue dies, the electrical vectors change in a way that produces a deep, wide Q wave in the leads over the affected area. These waves persist as a scar and serve as a lasting marker that an infarct has occurred. While ST-segment elevation signals acute injury and depressed T waves indicate ischemia, they are not the enduring sign of infarction. A normal QRS complex would not fit MI. Therefore, significant Q waves are most closely associated with myocardial infarction.
Question 2
Which of the following best describes insensible water loss?
Correct Answer:
Through the skin or exhalation
Explanation:
Insensible water loss is the water the body loses that you can’t perceive or easily measure. The main routes are evaporation from the skin and water vapor lost during respiration (exhaled air). This is why “through the skin or exhalation” is the best description. In contrast, losses through urine, vomiting, or stool are observable or measurable—sensible losses.
Question 3
Normal hematocrit range is?
Correct Answer:
40-50%
Explanation:
Hematocrit is the percentage of blood volume that is occupied by red blood cells, reflecting the red cell mass relative to plasma. In healthy adults, the normal range is about 40–50%, with some variation by sex and by lab reference standards. This makes 40–50% the best choice because values below this band suggest anemia or blood loss, while values above this band point toward dehydration or polycythemia. Values far outside this range (lower around 20–30% or higher around 50–60% and above) are not considered normal for routine reference ranges.
Question 4
Depressed or inverted T waves indicate?
Correct Answer:
Myocardial ischemia
Explanation:
Depressed or inverted T waves reflect altered ventricular repolarization due to reduced oxygen supply to the heart muscle. When ischemia affects the myocardium, especially subendocardial tissue, repolarization changes cause the T wave to flatten or invert. This pattern is a classic sign of myocardial ischemia, seen with angina or NSTEMI. Other conditions don’t fit this pattern as neatly: pulmonary embolism isn’t defined by T wave inversion, pericarditis typically shows diffuse ST elevation with PR depression, and atrial fibrillation is a rhythm issue with absent P waves rather than characteristic T wave changes.
Question 5
An ET tube should be positioned how many centimeters above the carina?
Correct Answer:
2 to 6 centimeters above the carina
Explanation:
Position the endotracheal tube tip a few centimeters above the carina. The carina is where the trachea splits into the main bronchi, so placing the tip about 2 to 6 centimeters above this point keeps both lungs ventilated while staying away from the bronchial entrance. If the tip is too deep, the tube can advance into a mainstem bronchus (often the right), causing unilateral ventilation. If the tip is too high in the trachea (as with 8–12 or 12–15 cm above the carina), the tube is easier to dislodge with movement and may fail to provide stable ventilation. In adults, an approximate depth of about 2–6 centimeters above the carina is the safest and most reliable range.
Question 1
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About this Exam

Prepare with the NBRC Registered Respiratory Therapist (RRT) Exit Practice Exam practice quiz. This question bank includes 10 questions covering normal, condition, finding, nbrc, and registered. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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NBRC Registered Respiratory Therapist (RRT) Exit Practice Exam

This practice set contains 10 questions from the matching question bank and focuses on normal, condition, finding, nbrc, and registered. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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