Medical School MD + DO Mastery

A 4-year, board-aligned study system for medical school and licensing exams.

Walk the full Year 1–4 curriculum — foundational sciences, organ-system blocks, clinical clerkships and advanced practice — each with mastery checklists and linked learning resources, plus a dedicated review system for school exams, Shelf/COMAT, USMLE Step 1–3 and COMLEX-USA Levels 1–3.

YEAR 2 SYSTEMS REVIEW - CARDIOVASCULAR

YEAR 2 | PAGE 47A - NORMAL PHYSIOLOGY -> HEMODYNAMIC FAILURE -> ECG / MURMUR -> PATHOLOGY / PHARM

CARDIOVASCULAR SPINE: ANATOMY / CONDUCTION -> CARDIAC CYCLE -> PRESSURE-VOLUME -> CARDIAC OUTPUT / RESISTANCE -> ISCHEMIA / FAILURE / VALVES / ARRHYTHMIAS -> DIAGNOSTIC CLUE -> MECHANISM-BASED THERAPY. A. CARDIOVASCULAR CLOSED-BOOK REVIEW MAP

LANE	MUST RETRIEVE WITHOUT NOTES	HIGH-DISCRIMINATION TRANSFER
Hemodynamics	Wiggers; PV loops; preload, afterload, contractility, compliance; CO, SV, EF; MAP/TPR; venous return.	Given one perturbation, predict pressure, volume, SV/CO and compensatory response before naming a disease.
Ischemia + failure	Supply-demand, plaque/thrombus, infarct evolution/complications; systolic vs diastolic failure; left vs right congestion.	Move from symptoms + ECG/biomarker/hemodynamics to the failure mechanism and the highest-value next inference.
Valves + murmurs	Stenosis vs regurgitation; chamber pressure/volume load; timing, radiation and maneuver physiology.	Derive the murmur from when pressure crosses a diseased valve, then use maneuvers only as confirmation.
Rhythm + drugs	Nodal vs myocyte APs; conduction system; common blocks/tachyarrhythmias; major antiarrhythmic and CV drug mechanisms.	Interpret rate/rhythm/interval first, then connect drug target to predictable electrophysiologic/hemodynamic effect.

B. TOP 10 MOST-MISSED SYSTEM CONCEPTS - #1 TO #4

# / CONCEPT	DEEP EXPLANATION	WHY STUDENTS MISS IT	EASIEST CLUE
1. Preload vs afterload vs contractility	Preload is end-diastolic filling/stretch; afterload is the pressure/resistance the ventricle must eject against; contractility is intrinsic squeeze at a given preload/afterload. PV loops encode all three.	Students memorize arrow tables without anchoring each variable to a physical event, so one novel valve/drug perturbation breaks the pattern.	Ask: fill, push against, or squeeze?
2. Murmur timing is pressure logic	A murmur occurs when turbulent flow crosses a valve during the phase in which that valve should be open or is pathologically leaking. Timing + location + radiation + maneuvers are downstream of hemodynamics.	Murmurs are often learned as sound-label pairs, so changes with preload/afterload seem arbitrary.	First decide systole or diastole, then ask which valve has abnormal flow in that phase.
3. ECG is conduction, not a picture dictionary	Rate, rhythm, P-QRS-T timing, intervals, axis and ST-T changes reflect depolarization/repolarization across tissue. Electrolytes, ischemia and drugs alter the underlying electrical process.	Pattern recognition is fast but brittle; students may name a tracing yet fail to explain the altered tissue/conduction step.	Translate every abnormality into where conduction or repolarization changed.
4. Shock profiles come from pump, volume and resistance	Cardiogenic, hypovolemic/distributive and obstructive states differ in preload, pump function, vascular tone and compensatory physiology. The same low BP can arise from different causal chains.	Learners anchor on hypotension alone and miss the hemodynamic pattern.	Think tank - pump - pipes - obstruction.

C. HIGH-VALUE REVIEW RESOURCES - DIRECT + PLAYABLE

RESOURCE	ROLE IN THIS REVIEW
Ninja Nerd - Cardiac Cycle	Deep Wiggers/pressure-volume foundation; redraw after viewing.
Ninja Nerd - ECG Basics	Lead/wave/interval physiology before tracing memorization.
Ninja Nerd - Coronary Artery Disease	Mechanism -> ischemic syndrome -> ECG/diagnostics -> treatment framework.
Ninja Nerd - Congestive Heart Failure	Pump failure, neurohormonal compensation, congestion and therapy.
Dirty Medicine - Heart Murmurs	High-yield consolidation after valve hemodynamics are secure.

C. HIGH-VALUE REVIEW RESOURCES - DIRECT + PLAYABLE

SCHOOL-EXAM GATE	BOARD / COMLEX TRANSFER
• Rebuild Wiggers/PV loops without notes. • Interpret unfamiliar ECG/murmur/graph before disease-name recall.	• Mixed vignette: physiology/pathology -> clue -> mechanism -> answer. • Use UWorld/AMBOSS for transfer; NBME/COMSAE trends for calibration.
• Explain drug effects from receptor/channel/hemodynamic target. 2026/27 systems-review expanded edition - align with school objectives and verify official exam updates before testing	• DO learners retain osteopathic framing without separating it from biomedical reasoning.