What are heart sounds? Heart sounds are sounds produced by the mechanical activities of the heart during the cardiac cycle
Heart sounds are sounds produced by the mechanical activities of the heart during each cardiac cycle
The heart sounds are produced by ?
Flow of blood through the cardiac chambers
Closure of thevalves of the heart
Contraction of the cardiac muscles
How many heart sounds are produced during the cardiac cycle
Four
The first two heart sounds are known as ?
The classical heart sounds
What do the first heart sound sound like ? It sounds like the audi
It sounds like the audible words “LUBB"
Are the first and second heart sound most prominent?
At what phase of the cardiac cycle is the first heart sound produced ?
During the isometric phase
At what phase of the cardiac cycle I the first heart sound heard
During the isometric contraction
What causes the first heart beat ?
The closure of the atrioventricular valave
Are they other factors responsible for the first heart sound ? If is then list them Yes
Yes they are there factors .
They are just four, which are :
Valvular factor
Vascular factor
Macular factor
Atrial factor
What is the valvular factor ? Th
Thsi is when the closure of the atrioventricular valves send waved to the valvular leaflets and the chordae tendineae.
They are mostly responsible for the first heart sound
What is the vascular factor?
This is the rush of blood from the ventricles into the aorta or the pulmonary trunk/artery
What is the muscular factor ? This is t then
This is the muscular tension and contraction of the ventricular muscles during the isometric contraction and ejection period
What is atrial factor ?
Vibrations produced by the atrial systole
What is the duration of the first heart sound ? O.1o
0.10 to 0.17 seconds
The first heart sound cincides with what on the ECG ?
It coincides with the peak of the “R" wave
At what phase of the cardiac ch let is the second heart beat ? During the
During the isovolumetric contraction or protodiastole period
What causes the second heart sound ?
The closure of the semilunar valves
How does the second heart sound sound like ?
It is a short, sharp, and high pitched sound
What spoken word does the second heart sound sound like ?
“ DUBB"
What is the duration of the second heart beat ?
0.10 to 0.14 seconds
What does the second heart beat coincides with on the ECG? The
The “T wave "
What does the third heart sound sound like ?
It is a low pitch sound
Is the third heart beat sound only heard with through a microphone?
Yes
Is the first and secind heart beat heard with only a stethoscope?
At what phase of the cardiac cycle is the third heart sound heard ?
The rapid filling period
The third heart is also known as ?
Ventricular gallop or protodiastolic gallop
What causes the third heart sound ?
The rush of blood into the ventricles that send vibration in the ventricular walls.
It may also be caused by the vibrations of the chordae tendineae
What is the duration of the third heart sound ?
0.7 to 0.10 seconds
What is the third heart beat seen on the ECG It is seen as the “T" and
It is seen as the “T" and “ P" waves on the ECG
Is the fourth heart sound inaudible ?
Yes it is
When and only is the fourth heart sound heard ?
During pathological conditions
What causes the fourth heart sound ?
The contraction of the atrial musculature
At what phase of the cardiac cylce is the fourth heart sound heard ?
During the late systole or the artial systole
Last changed7 months ago