These CFRN practice questions target diagnostics — including Tension Pneumothorax. The complete CFRN deck holds 1000 flashcards, 40 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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During an E-FAST on a blunt trauma patient, which specific anatomical location is considered the most sensitive for detecting early intraperitoneal free fluid?
Show answer →Morison's Pouch (Hepatorenal Recess). It is the most dependent part of the upper abdomen in a supine patient. Fluid typically accumulates here first before the LUQ or pelvis. BCEN Strategy: Recognize that while RUQ is most sensitive, a negative FAST does not rule out injury; serial scans or CT (if stable) are required. Distractor: Splenorenal recess (less sensitive due to splenic ligaments).
You are performing a FAST exam and see a mirror image of the liver above the diaphragm. Is this a positive finding for hemothorax?
Show answer →No, this is a normal Mirror Image Artifact. It occurs when ultrasound waves reflect off the highly reflective diaphragm-lung interface. Rationale: The presence of a mirror image artifact actually rules out a significant pleural effusion/hemothorax in that specific location, as fluid would provide a clear window and eliminate the artifact. BCEN Tip: Artifacts are common distractors; know that Spine Sign = Fluid, Mirror Image = No Fluid.
In the setting of a suspected Tension Pneumothorax during flight, which POCUS finding most necessitates immediate needle decompression or finger thoracostomy despite stable vital signs?
Show answer →While POCUS is diagnostic, clinical signs of Tension PTX (hypotension, tracheal shift, increased peak pressures) drive treatment. However, if ultrasound shows absent lung sliding AND a Lung Point is not found because the lung is completely collapsed, or if you see a Lung Pulse disappear in a previously sliding lung, tension may be developing. BCEN Focus: In the CFRN exam, the Lung Point is the most specific for PTX, but in a Tension PTX, you may not find a lung point because the lung never touches the chest wall. Treatment should be based on the clinical triad of respiratory distress, absent sliding, and hemodynamic compromise.
In a patient with ST elevation in II, III, and aVF, you observe ST depression in I and aVL. What is the significance of these findings?
Show answer →These are reciprocal changes, confirming an Inferior STEMI and increasing the likelihood of an acute arterial occlusion rather than a mimic (like pericarditis). ST depression in aVL is the most sensitive indicator of early inferior MI, often appearing before ST elevation in the inferior leads. BCEN Tip: Reciprocal changes are mirrors of the injury; if you see elevation, look for depression 180 degrees away.
pH 7.20, HCO3 12, PaCO2 26. Calculate if respiratory compensation is appropriate using Winter's Formula.
Show answer →Winter's Formula: Expected PaCO2 = (1.5 x HCO3) + 8 +/- 2. Calculation: (1.5 x 12) + 8 = 26 (+/- 2). Since the patient's PaCO2 is 26, it falls exactly within the expected range (24-28). Interpretation: Appropriately compensated Metabolic Acidosis. BCEN Tip: If the PaCO2 were higher than 28, it would indicate a concurrent respiratory acidosis (e.g., the patient is tiring out), which is a high-yield exam finding for intubation readiness.
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Try 30 free CFRN cards firstThe full CFRN deck contains 1000 flashcards, and 40 of them focus on diagnostics. This page shows 5 free samples.
Our CFRN deck dedicates 40 of 1000 cards (4%) to diagnostics — always cross-check the official BCEN exam outline for the current blueprint weighting.
Yes — the samples on this page are free, and the CFRN preview page has 30 more free cards. Full access to all 1000 cards is a one-time $7.
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