Ch. 20- Cardiovascular and Neck Vessels Assesment Flashcards
The heart chambers are separated by valves, whose main purpose is what?
To prevent backflow of blood
Valves are unidirectional meaning what?
They can only open one way.
How many valves are in the heart?
4
What are the 4 valves in the heart?
- Two antrioventricular (AV) valves known as tricuspid (R) and mitral (L)
- Two semilunar (SL) valves known as aortic (L) and pulmonic (R)
The AV valves separate what?
Atria and ventricles.
AV valves open during what?
Diastole to allow ventricular refill
AV valves close during what?
Systole to prevent backflow
What is S1?
first heart sound (AV valve closing: systole)
SL valves are set between what?
Ventricles and arteries.
SL valves open during what?
Systole to allow ventricular ejection.
SL valves close during what?
Diastole to allow ventricular filling.
What is S2?
Second heart sound (SL valves closing: diastole)
Where can S1 be heard?
Over all pericardium, but loudest at apex
Where can S2 be heard?
Over all pericardium, but loudest at base
What are two extra heart sounds?
S3 and S4
When is S3 heard?
When ventricles resistant to filling during early rapid filling phase.
Ventricular filling causes what?
Vibrations
What does S3 sound like?
“lub, dub, a” (Kentucky)
When does S4 occur?
At the end of diastole, when ventricle is resistant to filling
(Just before S1)
What do the atria do during S4?
Atria contract and push blood into noncompliant ventricle
this creates vibrations heard as S4
What does S4 sound like?
“dah, lub, dub” (Tennessee)
What are murmurs created by?
Conditions that cause turbulent blood flow and collision currents
What do murmurs sound like?
Gentle, blowing, swooshing sounds (lower frequency, use bell)
What are causes of a murmur?
- Increased blood velocity-flow murmur
- increased blood viscosity
- structural defects in valves
What is regurgitation?
A backflow of blood caused by failure of the heart’s mitral valve to close tightly.