Internal Medicine EOR: 3 Topics That Show Up on Every Exam

If you are a PA student currently on your Internal Medicine rotation, you probably already know that the IM End of Rotation (EOR) exam is often considered one of the most challenging. Unlike shorter rotations, Internal Medicine covers a massive breadth of content. You aren't just looking at one organ system; you are looking at how every system interacts within the adult patient.

The Internal Medicine EOR typically follows the PAEA content guidelines, which allocate weight to different systems. If you want to study efficiently, you need to focus on the heavy hitters. You cannot know every single rare condition, but you can: and should: master the topics that are virtually guaranteed to appear on your exam.

To help you secure that passing score (and hopefully a few points higher), we are breaking down the three highest-yield topics for the Internal Medicine EOR. If you need a comprehensive tool to help you study, PAtopia’s Internal Medicine Module is designed exactly for this purpose.

1. Cardiovascular System: The 20% Powerhouse

Cardiology is the king of the Internal Medicine EOR. According to the standard content guidelines, about 20% of your exam will be cardiovascular. If you miss the cardio questions, it is very difficult to recover.

Heart Failure (HF)

You must understand the difference between Heart Failure with Reduced Ejection Fraction (HFrEF) and Heart Failure with Preserved Ejection Fraction (HFpEF). For the EOR, focus on Guideline-Directed Medical Therapy (GDMT).

• The "Big Four" for HFrEF: You should know that ACE inhibitors/ARBs (or ARNI), Beta-blockers, Mineralocorticoid Receptor Antagonists (MRA), and SGLT2 inhibitors are the standard of care for mortality benefit.
• Clinical Presentation: Look for signs of volume overload: JVD, S3 gallop, peripheral edema, and paroxysmal nocturnal dyspnea (PND).

Murmurs

The EOR loves murmurs because they allow for multi-step questions. You might get a physical exam finding and then be asked for the next diagnostic step (usually an Echocardiogram).

• Aortic Stenosis: Look for the "crescendo-decrescendo" systolic murmur at the right upper sternal border that radiates to the carotids. Remember the triad: Chest pain, Syncope, and Dyspnea (SAD).
• Mitral Regurgitation: Holosystolic murmur at the apex radiating to the axilla.

Hypertension (HTN)

Know the JNC guidelines and the more recent AHA/ACC stages. Focus on the drug of choice for specific patient populations:

• Diabetes: ACEi or ARBs are first-line for renal protection.
• Chronic Kidney Disease: ACEi or ARBs.
• Black patients (without CKD): Thiazides or Calcium Channel Blockers.

For a deeper dive into cardiology that mirrors the complexity of the EOR, check out the cardiology section within PAtopia’s All-Access Pass.

2. Pulmonology: Managing the Airway (15%)

Coming in right behind cardiology is Pulmonology. You will see roughly 15% of your questions in this category. The Internal Medicine EOR focuses heavily on chronic management and acute exacerbations.

Chronic Obstructive Pulmonary Disease (COPD)

Expect questions on the gold-standard diagnosis (Spirometry/PFTs) and the management of acute exacerbations.

• Diagnosis: FEV1/FVC ratio < 0.70.
• Acute Exacerbation: Know the treatment triad: Bronchodilators (SABA/SAMA), systemic corticosteroids (Prednisone), and antibiotics (especially if there is increased sputum purulence or volume).

Pneumonia

Community-Acquired Pneumonia (CAP) is a staple. You need to know the most common pathogens and the criteria for admission.

• Organisms: Streptococcus pneumoniae is the #1 cause. Mycoplasma pneumoniae is the classic "walking pneumonia" in younger adults.
• CURB-65 Score: This is a high-yield tool for deciding if a patient needs hospitalization. (Confusion, Urea > 7, Respiratory rate ≥ 30, Blood pressure < 90 systolic or ≤ 60 diastolic, Age ≥ 65).

Pulmonary Embolism (PE)

Internal Medicine patients are often hospitalized or sedentary, making PE a major risk.

• Risk Factors: Look for Virchow’s Triad (Stasis, Hypercoagulability, Intimal damage).
• Diagnosis: If the patient is stable and has high clinical suspicion (Wells Criteria), the gold standard is CT Pulmonary Angiogram. If they have renal failure or a contrast allergy, consider a V/Q scan.

Mastering these pulm topics is essential for both your rotation and the PANCE prep courses you will eventually take. You can practice Pulm-specific vignettes in the PAtopia Internal Medicine module.

3. Endocrinology: The "Bread and Butter" (8%)

While 8% sounds small compared to cardio, the questions are usually straightforward if you know your stuff. This is where you can pick up "easy" points.

Diabetes Mellitus (DM)

This is the most common endocrine topic. Focus on diagnostic thresholds and chronic management.

• Diagnosis: Fasting plasma glucose ≥ 126 mg/dL, HbA1c ≥ 6.5%, or random glucose ≥ 200 mg/dL with symptoms.
• First-line Medication: Metformin. Understand its side effects (GI upset) and the major contraindication (low GFR).
• Complications: Know the basics of DKA vs. HHS. DKA has a wide anion gap and ketones; HHS has profound dehydration and extreme hyperglycemia (> 600) without significant acidosis.

Thyroid Disorders

You must be able to interpret a thyroid panel instantly.

• Primary Hypothyroidism: High TSH, Low Free T4. Treatment is Levothyroxine.
• Primary Hyperthyroidism (Graves): Low TSH, High Free T4. Look for exophthalmos and pretibial myxedema.

Understanding these core IM concepts now will also make your future PANRE review course much smoother once you are a certified PA-C.

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Internal Medicine Clinical Assessment

Your patient is a 68-year-old male presenting with progressive shortness of breath and a 10-pound weight gain over the last two weeks. He reports needing to sleep on three pillows at night to breathe comfortably. His past medical history is significant for a myocardial infarction three years ago.

Physical Exam Findings:

• Vitals: BP 152/94 mmHg, HR 102 bpm, RR 22 bpm, SaO2 91% on room air.
• Neck: Jugular venous distension (JVD) noted at 6 cm above the sternal angle.
• Lungs: Fine crackles (rales) heard bilaterally at the bases.
• Heart: S3 gallop is audible at the apex.
• Extremities: 2+ pitting edema in the lower extremities bilaterally.

Question: What is the most likely underlying pathophysiology for this patient's current presentation?

A. Right-sided heart failure due to chronic pulmonary hypertension
B. Left-sided heart failure with reduced ejection fraction
C. Acute exacerbation of chronic obstructive pulmonary disease
D. Acute pericarditis with tamponade physiology

Explanation

The correct answer is B. Left-sided heart failure with reduced ejection fraction.

This patient presents with classic signs of volume overload and congestive heart failure. The presence of orthopnea (needing pillows to breathe), crackles in the lungs, and an S3 gallop are highly specific for left-sided heart failure. His history of a previous myocardial infarction significantly increases the likelihood of a reduced ejection fraction due to myocardial scarring.

Why the others are incorrect:

• A. Right-sided heart failure: While this causes JVD and peripheral edema, it does not typically cause pulmonary crackles unless it is secondary to left-sided failure.
• C. COPD exacerbation: This would present with wheezing and a history of smoking, but would not typically include an S3 gallop, JVD, or significant pitting edema.
• D. Acute pericarditis: This would present with pleuritic chest pain that improves when leaning forward, and tamponade would show Beck’s Triad (hypotension, JVD, muffled heart sounds), but not pulmonary edema/crackles.

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About the Author

Jeremy Boroff, MPAS, PA-C is the founder of CME Review Courses and PAtopia. With over 24 years of experience in Emergency Medicine, Jeremy is a seasoned clinician, author, and educator dedicated to helping PA students and practicing PAs excel in their careers. He is the author of several high-yield review books and has spent decades distilling complex medical topics into actionable clinical knowledge.