These CRT practice questions target diagnostics — including ETT. The complete CRT deck holds 1040 flashcards, 210 of them dedicated to this topic. Study the free samples below, then unlock the whole collection for a one-time $7.
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A chest X-ray is performed to confirm endotracheal tube (ETT) placement after a difficult intubation. Where should the tip of the ETT be positioned relative to the carina for an adult patient?
Show answer →The ETT tip should be 3-5 cm (roughly 1.5-2 inches) above the carina. This ensures the tube remains in the trachea during neck flexion/extension. NBRC Tip: The carina is located at the level of the 4th or 5th thoracic vertebrae (T4-T5). If the tube is too high, it risks accidental extubation; too low, it risks right mainstem bronchus intubation.
During a POCUS exam, you observe multiple vertical, hyperechoic artifacts originating from the pleural line and extending to the bottom of the screen (B-lines) in 3 or more zones bilaterally. What clinical condition does this interstitial syndrome represent?
Show answer →Bilateral B-lines (comet tails) indicate Pulmonary Edema (interstitial or alveolar). B-lines represent fluid-filled interlobular septa. When >3 are seen in a single view, it is pathological. NBRC Strategy: Differentiate from COPD where A-lines (horizontal reverberations) predominate. If B-lines are focal or unilateral, consider pneumonia or lung contusion rather than heart failure.
An arterial blood gas shows pH 7.21, PaCO2 30 mmHg, and HCO3 14 mEq/L. The patient has acute renal failure. How should the RT interpret the PaCO2?
Show answer →This is a partially compensated metabolic acidosis. The low HCO3 (renal failure causing retention of fixed acids) is the primary insult, and the low PaCO2 is the respiratory system's attempt to compensate via hyperventilation. NBRC Tip: In renal failure, always check the Anion Gap; an elevated AG (>14) confirms the accumulation of fixed acids like phosphates and sulfates.
A patient in the ICU has: pH 7.56, PaCO2 44 mmHg, HCO3 38 mEq/L. What is the interpretation and a common cause for this finding?
Show answer →Uncompensated Metabolic Alkalosis. Rationale: pH is high (>7.45) and HCO3 is high (>26). The PaCO2 is within the normal range (35-45), indicating no respiratory compensation has occurred. Common Causes: Persistent vomiting (loss of HCl), nasogastric suctioning, or excessive diuretic therapy (Lasix). NBRC Strategy: While the respiratory system *should* compensate by hypoventilating (increasing PaCO2), it is often limited because the body's drive to breathe (hypoxic drive) prevents the CO2 from rising too high. Therefore, metabolic alkalosis often appears uncompensated or only slightly compensated.
A patient performs an MVV test with a result of 60 L/min. Their FEV1 is 2.5 L. Does this MVV reflect adequate patient effort?
Show answer →No, the effort is likely inadequate. The MVV should approximately equal FEV1 x 40. Calculation: 2.5 L x 40 = 100 L/min. A result of 60 L/min is significantly lower than the expected 100 L/min (only 60% of predicted based on FEV1), suggesting poor effort or fatigue. NBRC Tip: Use the FEV1 x 40 rule to validate MVV; if the measured MVV is much lower, the test is unreliable for determining surgical risk.
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Try 30 free CRT cards firstThe full CRT deck contains 1040 flashcards, and 210 of them focus on diagnostics. This page shows 5 free samples.
Our CRT deck dedicates 210 of 1040 cards (20%) to diagnostics — always cross-check the official NBRC exam outline for the current blueprint weighting.
Yes — the samples on this page are free, and the CRT preview page has 30 more free cards. Full access to all 1040 cards is a one-time $7.
Assessment
110 cards
Basics
70 cards
Management
140 cards
Monitoring
90 cards
Pathology
80 cards
Pharmacology
90 cards
Procedures
220 cards
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