00:02 In this lecture, we’re going to talk about barometric pressure and how it affects the pulmonary system. 00:07 We have a number of important learning goals to go through. 00:10 After this lecture, you will be able to identify the major physiological responses to both acute and chronic increases in barometric pressure as well as specific aspects of breath hold-diving. 00:24 In this lecture, we will also be able to identify the major physiological responses to decreases in barometric pressure both in acute and chronic conditions. 00:34 Finally, we’ll go through the important and very interesting process of understanding the pathophysiology of altitude illnesses including acute mountain sickness, high altitude cerebral edema and high altitude pulmonary edema. 00:49 Okay, let’s talk about high barometric pressures first. 00:54 To do that, what we’re going to do is talk about increases in barometric pressure. 01:00 Barometric pressure increases as you go beneath the level of the water. 01:05 So at sea level, you may have a barometric pressure of around 760 millimeters of mercury. 01:11 As you go only 30 meters underneath the water, you will double the barometric pressure. 01:18 What kind of changes happen when you do breath hold-diving? There’s both an increase in the amount of barometric pressure, but what that also does is changes the volume with in the lungs. 01:30 So if you started out with a volume of let’s say 6 liters. 01:34 If you go 30 meters underneath the water, you will decrease that in half to only 3 liters. 01:40 During the ascent or the process of you going back to the surface of the water, pressure will start to decrease and lung volume will increase and this just is a process of the physics involved with high barometric pressures. 01:56 I have a good example for you that hopefully will emphasize the importance of understanding how barometric pressure affects the ability to do your breath hold-diving and one very important clinical aspect.
The lecture Breath-hold Diving – Effect of Barometric Pressure on the Pulmonary System by Thad Wilson, PhD is from the course Respiratory Physiology.
Which of the following happens as you descend into the water?
5 Stars |
|
1 |
4 Stars |
|
0 |
3 Stars |
|
0 |
2 Stars |
|
0 |
1 Star |
|
0 |
his lecturers are really fantastic in content and very easy to understand, just a few pronunciation issues