filmov
tv
USMLE Respiratory 4: Physiology - V/Q Mismatch and A-a Gradient
Показать описание
Want to support the channel? Be a patron at:
More lung physiology! The big overarching message today is that not every single molecule of oxygen that you breathe in will go into your blood! Now there are several ways we can look at this. The first way is measuring VQ ratio. Ventilation is measured as V, and perfusion is measured as Q. Now ideally, we'd want it to VQ = 1, but instead it's 0.8. Now the apex of the lung has more ventilation and VQ is 3. At the base, it is 0.6 and thus the average is about 0.8. You can get this closer to 1 by exercise or by lying down. Now how can lung pathology affect our VQ? Let's take it to the extreme. What if there is no ventilation? Then V = 0 and thus V/Q is close to 0. This does not respond to oxygen therapy. If perfusion reaches 0, then P = 0 and thus VQ = infinity. This does respond to oxygen therapy.
Now another way to illustrate this point is via the A-a gradient. This is the difference between the oxygen content in your alveoli and your arteries! Normally the gradient is less than 15 meaning the lung is normal. Thus if a pt has hypoxemia or hypoxia but they have a normal A-a gradient, then the problem is outside the lungs! Make sure you look at my notes to see the equation and a practice question!
Done!
More lung physiology! The big overarching message today is that not every single molecule of oxygen that you breathe in will go into your blood! Now there are several ways we can look at this. The first way is measuring VQ ratio. Ventilation is measured as V, and perfusion is measured as Q. Now ideally, we'd want it to VQ = 1, but instead it's 0.8. Now the apex of the lung has more ventilation and VQ is 3. At the base, it is 0.6 and thus the average is about 0.8. You can get this closer to 1 by exercise or by lying down. Now how can lung pathology affect our VQ? Let's take it to the extreme. What if there is no ventilation? Then V = 0 and thus V/Q is close to 0. This does not respond to oxygen therapy. If perfusion reaches 0, then P = 0 and thus VQ = infinity. This does respond to oxygen therapy.
Now another way to illustrate this point is via the A-a gradient. This is the difference between the oxygen content in your alveoli and your arteries! Normally the gradient is less than 15 meaning the lung is normal. Thus if a pt has hypoxemia or hypoxia but they have a normal A-a gradient, then the problem is outside the lungs! Make sure you look at my notes to see the equation and a practice question!
Done!
0:09:13
USMLE Respiratory 4: Physiology - V/Q Mismatch and A-a Gradient
0:10:29
Anatomy and physiology of the respiratory system
0:10:42
RESPIRATORY 4 | FIRST AID 2022 | USMLE STEP 1
0:27:03
USMLE Step 1 | Oxygen content of blood | Respiratory # 4 | First Aid in Urdu/Hindi
4:46:18
USMLE STEP 1 RESPIRATORY SYSTEM LECTURE 4 FIRST AID
0:02:48
Perfusion limited vs diffusion limited | USMLE STEP 1| respiratory physiology
0:31:41
Respiratory | Mechanics of Breathing: Pressure Changes | Part 1
0:19:16
Respiratory Physiology part 1 From First Aid USMLE Step One (1)
0:49:58
USMLE Step 1 | Physiological dead space, Ventilation, Haemoglobin, CO2 Transport | Respiratory # 3
0:15:00
Respiratory System Physiology - Ventilation and Perfusion (V:Q Ratio) Physiology
0:26:04
Cardiovascular & Respiratory Cases for USMLE | Anatomy, Physiology, Pathology, Microbiology, Pha...
0:04:28
WORK OF BREATHING PART 1| Usmle| respiratory physiology|
0:05:47
USMLE-Rx Express Video of the Week: Lung Volumes and Capacities
3:04:58
USMLE STEP 1 RESPIRATORY SYS LECTURE 1 FIRST AID
0:13:32
LUNG AND CHEST WALL GRAPH | COMPLIANCE explained | USMLE STEP 1 | RESPIRATORY PHYSIOLOGY
0:09:33
Obstructive vs. Restrictive Lung Disease || USMLE
0:16:53
Pulmonary Lecture 1 | USMLE Guys Step 1 Crash Course
0:04:59
Pulmonary Hypertension|USMLE STEP1| Respiratory Physiology|Pathophysiology|Pathoma
0:06:21
Lung and Chest wall Compliance | Breathing Mechanics | Respiratory Physiology
0:14:07
USMLE Respiratory 6: Compliance and Elasticity, Spirometry and Lung Volumes
4:41:15
USMLE STEP 1 RESPIRATORY SYSTEM LECTURE 2 FIRST AID
0:11:19
USMLE Step 1: How to solve V/Q mismatch questions, the A-a gradient
0:01:01
Hypoxemia for the USMLE | HyGuru
0:23:00
Usmle step 1 first Aid 2022 || part2 Pulmonary physiology || pulmonary volumes || pulmonary capacity
Комментарии