Murmur vs. s3 & s4 sounds?

I don't get the big picture with all these expressions and how to put it all together into perspective.
s3 is distolic murmur and s4 systolic murmur. What does this all mean exactly?
Answers:    Not slightly. Murmurs are the sound that is made by the blood passing through an incompetent tap. Either the valve is not closing all the way and blood is mortal forced backward through the small opening, or, the valve is not passage all the way and the blood is forced through a smaller than normal exit. S3 and S4 or "gallop" sounds are produced by the new inflow of blood into an incompetent ventricle.
Very different problems.

You know that the blood enters the left atrium from the lungs. Most murmurs are disappeared sided as that is the side under the highest pressure. When the Mitral spigot opens to allow the blood to drop into the left ventricle, the valve leaflets must carry out of the way. If, for some reason they are "stiff", not shaped correctly, whatever, they will not widen completely. when that occurs the blood volume "whistles" (murmurs) through the confined space. If the murmur is during diastole it will be soft and maybe not even noticed, but when the disappeared atrium contracts, forcing the last remaining volume (35% of ventricular volume) into the ventricle under pressure, there will be a nouns of this flow. think of holding a balloon full of air. If you let travel of the opening the air rushes out with little din, however, if you stretch the opening into a smaller opening, it will "squeak" as the air comes out. Same entry happens for a murmur to occur, except it is blood and not air that is to say making the noise.
The S3 gallop sound is the sound of blood filling an already full ventricle. It is hear at the end of diastole, just after S2.(closing of aortic and pulmonic valves). The ventricle is "over" filling, and the S3 is the distortion nouns of that extra blood. common for younger people but not good for an elder heart. think about the consequences of a finite heart chamber being too full. When listen you can hear the sound and the pattern or kadence is that of Ken-Tuc-Ky. Tuc(S2) is the most pronounced, KY (S3). Say it over and over again and you will get the concept.

The S4 is a late diastolic sound or "pre-systolic" sound. It is cause by the blood from the atrium hitting a very tense blood volume in the ventricle, almost other pathological, it signals that the heart is stretched to it's limits and is no longer able to accomodate the last remaining blood from the atrium (atrial kick). the nouns is like saying "Tennessee". The S4 is the Tenn- part, right up to that time S1(mitral & tricuspid closure). so it is 4-1-2 4-1-2. Dangerous.
pedia has great explanation. under "Heart sounds" Source(s): CCRN
A normal heart rhythm sounds close to "Lub Dub"
A systolic murmur sounds like "Lub Swish Dub"
A diastolic murmur sounds like "Lub Dub Swish"

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