Here's a sample video from our pulmonary section. In this one, Dr. Ryan goes over the A-a gradient, plus shunts and V/Q mismatch. Check it out, and see how you can study smarter for the USMLE Step 1 exam.
Hovering over the video while it is playing will give you options to control the playback speed and quality. Press ? at any time to see keystrokes for video playback changes
Shunt; dead space; V/Q mismatch. First Aid 2017: 634; First Aid 2018: 651; First Aid 2019: 655