Internal Medicine COMAT (NBOME COMAT-IM) – 250 Questions – Cardiology, Pulmonology, Nephrology, Infectious Disease Q&A 2026

This document contains a comprehensive set of approximately 250 high-yield Internal Medicine COMAT-style clinical questions with verified answers, designed to enhance diagnostic reasoning, clinical decision-making, and board exam performance. It covers a wide range of core internal medicine topics including cardiology (e.g., aortic dissection, CHF management, MI complications), pulmonology (e.g., ARDS, asbestosis, restrictive vs obstructive lung disease), nephrology (e.g., prerenal vs intrinsic AKI, CKD staging), infectious diseases (e.g., HIV, PCP pneumonia, tuberculosis), hematology, endocrinology, rheumatology, and gastroenterology. Early sections (pages 1–5) emphasize neurologic and pharmacologic emergencies such as alcoholic cerebellar degeneration and acute dystonia, while later sections expand into complex multisystem diseases, diagnostic criteria (e.g., Berlin criteria for ARDS, Wells score, CURB-65), and advanced management strategies. The document integrates high-yield clinical associations, gold-standard diagnostic tests, and first-line treatments essential for COMAT and board exams. It includes detailed coverage of critical care topics such as ARDS ventilator management, sepsis criteria, and electrolyte abnormalities, alongside important chronic disease management (e.g., diabetes, hypertension, CKD). Additionally, it highlights key exam-tested frameworks such as Light’s criteria for pleural effusions, CHA₂DS₂-VASc scoring for anticoagulation, and TIMI risk scoring for cardiac events. Pharmacology is reinforced through mechanism-based learning (e.g., antipsychotic-induced dystonia, SGLT2-induced euglycemic DKA), while immunologic and hematologic disorders (e.g., antiphospholipid syndrome, TTP, aplastic anemia) are presented with clear diagnostic pathways and treatment approaches. This resource is highly relevant for courses such as Internal Medicine Clerkship, Clinical Medicine, Cardiology, Pulmonology, Nephrology, Infectious Disease, and Critical Care Medicine. It is ideal for osteopathic medical students (DO programs) preparing for the Internal Medicine COMAT exam (NBOME), as well as students preparing for COMLEX Level 2-CE and USMLE Step 2 CK. It is also suitable for physician assistant (PA) students, nursing students, and international medical graduates seeking a comprehensive internal medicine review. The content aligns closely with widely used board preparation textbooks such as First Aid for the USMLE Step 2 CK, Step-Up to Medicine, and UWorld Step 2 CK, making it a powerful supplementary resource for consolidating high-yield knowledge, improving clinical reasoning, and maximizing exam performance. Keywords: internal medicine, COMAT, cardiology, pulmonology, nephrology, infectious disease, hematology, endocrinology, critical care, ARDS, CKD, HIV, sepsis, Wells criteria, CURB 65, Light criteria, clinical questions, board exam preparation