These TCRN practice questions target pathology — including CPP, Cerebral Perfusion Pressure, Kellie Doctrine, LOC. The complete TCRN deck holds 1050 flashcards, 230 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 patient with TBI has a BP of 110/60 and an ICP of 22 mmHg. Calculate the Cerebral Perfusion Pressure (CPP) and determine if this meets current guidelines for TBI management.
Show answer →MAP = [110 + 2(60)]/3 = 76.6. CPP = MAP - ICP = 76.6 - 22 = 54.6 mmHg. According to Brain Trauma Foundation (BTF) guidelines, the target CPP for TBI is 60-70 mmHg. This patient's CPP is inadequate. Rationale: Maintaining CPP is crucial to prevent secondary ischemic injury. TCRN Tip: BCEN often tests the calculation and the target range. Avoid targets >70 mmHg as they increase the risk of ARDS due to aggressive fluid/vasopressor use.
Explain the Monro-Kellie Doctrine and how the body initially compensates for an expanding intracranial mass (e.g., a hematoma).
Show answer →The Monro-Kellie Doctrine states the cranial vault is a fixed volume containing brain (80%), blood (10%), and CSF (10%). An increase in one must be offset by a decrease in others. Initial compensation: 1) Displacement of CSF into the spinal subarachnoid space. 2) Increased CSF absorption. 3) Venous blood shunted into jugular veins. Once these are exhausted, ICP rises exponentially. TCRN Tip: Recognize that venous blood and CSF are the ONLY buffers; brain tissue cannot compress.
A patient presents after a temporal bone fracture with a brief Loss of Consciousness (LOC), a lucid interval, and rapid neurological decline. Identify the likely hematoma and the vessel involved.
Show answer →Epidural Hematoma (EDH). Vessel: Middle Meningeal Artery (MMA). Pathophysiology: High-pressure arterial bleeding between the skull and dura mater. The lucid interval occurs as the hematoma expands before compensatory mechanisms fail. TCRN Tip: EDH is often associated with linear fractures of the temporal bone. On CT, it appears biconvex (lens-shaped) because it cannot cross cranial sutures where the dura is tightly adhered.
Why are elderly patients and those with chronic alcohol use disorder at significantly higher risk for Chronic Subdural Hematomas (SDH) despite relatively minor trauma?
Show answer →Pathophysiology: Cerebral atrophy in these populations increases the space between the brain and the dura, stretching the fragile bridging veins. Minor acceleration/deceleration forces can rupture these veins, leading to slow, venous bleeding. Rationale: In atrophied brains, the brain has more room to move, increasing shear stress on veins. TCRN Tip: SDH is venous (low pressure) and appears crescent-shaped on CT, often crossing suture lines unlike an EDH.
Describe the mechanical force responsible for Diffuse Axonal Injury (DAI) and where these lesions are most typically found on imaging.
Show answer →Mechanism: Rotational acceleration/deceleration forces causing shearing and stretching of axons. Pathophysiology: This disrupts the axonal cytoskeleton, leading to impaired transport and eventual axonal swelling/disconnection. Locations: Grey-white matter junction, corpus callosum, and brainstem. TCRN Tip: DAI is a microscopic injury; initial CT may be normal or show small punctate hemorrhages. MRI (especially SWI/DTI) is the gold standard for diagnosis when clinical GCS is low but CT is clear.
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Try 30 free TCRN cards firstThe full TCRN deck contains 1050 flashcards, and 230 of them focus on pathology. This page shows 5 free samples.
Our TCRN deck dedicates 230 of 1050 cards (22%) to pathology — always cross-check the official BCEN exam outline for the current blueprint weighting.
Yes — the samples on this page are free, and the TCRN preview page has 30 more free cards. Full access to all 1050 cards is a one-time $7.
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