Source / episode info

• **Episode:**204
• **Title:**Divine Intervention Episode 204 – The USMLE And The Military (Ultra HY for all the USMLE exams!).
• **Published:**2020-01-16
• Source:Episode page

One-liner

This episode provides high-yield content for USMLE exams focusing on TBI management (GCS grading, ICP protocols, contraindications), PTSD pathophysiology (low cortisol/high catecholamines), and common comorbidities in military veterans (alcohol abuse, homelessness).

High-yield summary

• TBI Grading: Use the Glasgow Coma Scale (GCS): 13 (Mild/Concussion); 9-12 (Moderate TBI); 8 (Severe TBI).
• ICP Management: The quickest means to acutely lower ICP is hyperventilation, but this must be short-term due to the risk of cerebral vasoconstriction and ischemia. Other agents include Mannitol and Hypertonic Saline.
• TBI Protocol: Administer Tranexamic Acid (TXA) within the first three hours of TBI to decrease mortality risk.
• PTSD Diagnosis: Symptoms lasting <1 month indicate Acute Stress Disorder (ASD); symptoms >1 month indicate PTSD. Crucially, do not give SSRIs for ASD.
• PTSD Pathophysiology: Patients often exhibit abnormally low levels of cortisol and elevated catecholamines in the urine, reflecting a maladaptive hyperadrenergic response.
• TBI Sequelae: The most common cognitive impairment after TBI is memory loss. Post-concussive syndrome involves chronic headaches, dizziness, photophobia, and phonophobia following mild TBI.

Learning objectives

• Differentiate between mild, moderate, and severe TBI using the Glasgow Coma Scale (GCS).
• Identify critical interventions for managing elevated intracranial pressure (ICP) following TBI.
• Distinguish the clinical presentation and diagnostic criteria separating Acute Stress Disorder from PTSD.
• Recognize the pathophysiological markers of PTSD, specifically concerning cortisol and catecholamine levels.
• List key preventative measures in acute trauma care, such as administering TXA.