Chapter 20 (heart sounds)

22 terms by lshows 

Create a new folder

Advertisement Upgrade to remove ads

What causes heart sounds?

*Caused by the closing of valves and the collision of blood against them when they do

What causes AV valves to open?

*When atrial pressure exceeds ventricular pressure

*Opening and closing of valves is passive

What causes AV valves to close?

*When ventricular pressure exceeds atrial pressure

*Opening and closing of valves is passive

What causes semilunar valves to open?

*When ventricular pressure exceeds pulmonary trunk and aortic pressure

What causes semilunar valves to close?

*When pulmonary trunk and aortic pressure exceed ventricular pressure

What is the notation for the first heart sound?

S₁

What is the notation for the second heart sound?

S₂

What causes the first heart sound?

*"lub"

*Closing of the AV valves (tricuspid and bicuspid)

***LONGEST and LOUDEST SOUND

WHat causes the second heart sound?

*"dub"

*Closing of the pulmonary and aortic valves

Where can the sound of the tricuspid valve be most clearly heard?

*Fifth intercostal space

*On right side very near midline

Where can the sound of the bicuspid valve be most clearly heard?

*Fifth intercostal space

*Left side close to the nipple line

Where can the sound of the pulmonary valve be most clearly heard?

*Second intercostal space

*Left side slightly away from midline

Where can the sound of the aortic valve be most clearly heard?

*Second intercostal space

*Right side slightly away from midline

What type of blood flow is involved in a heart murmur?

Turbulent blood flow

What is stenosis?

*Narrowing a valve

*Creates resistance to blood flow

*Heard when blood flows through a valve

*A "swoosh" sound is heard just prior to the heart sounds

What sound is heard with an AV stenosis?

AV Stenosis prior to S₁sounds like "swoosh-lub"

What sound is heard with a Semilunar stenosis?

Semilunar stenosis prior to S₂sounds like "swoosh-dub"

What is valve insufficiency?

*aka Valve Regurgitation

*Improper closing of valves

*Causes a backflow of blood through valves

*Heard when valves are closed

*A "swoosh" sound is heard during and after heart sounds

What is heard during AV insufficiency?

AV insufficiency during S₁sounds like "swoosh-lub"

What is heard during Semilunar insufficiency?

Semilunar insufficiency during S₂sounds like "dub-swoosh"

What is the most commonly heard murmur?

Bicuspid valve insufficiency

What is a septal defect?

*"Hole in the heart"

*Causes blood flow to be turbulent

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set