lub dub of the heart

Question

When it comes to talking about the heart. I understand that lub means s1 and dub means s2. Next part systole is the cycle that includes s1 to s2 in that order. diastole is from s2 to s1 in that order. Correct me if I am wrong.

so my question is the relationship between s1 and s2 to the chambers when it comes to contraction and relaxing and where is the blood in each phase?

Answer 1

To clear things ups, S1 and S2 are the sounds of the valves closing during the cardiac cycle. Assuming there is no underlying pathologic condition in a patient's heart, the S1 is the sound you hear when the "AV valves" (tricuspid & mitral) are closing. The S2 sound you hear is the sound of the semilunar valves (i.e. aortic and pulmonic) closing.

You can appreciate the "lub dub" during auscultation because the valves are closing.

As far as your question goes, again, assuming a healthy heart and in broad stroke terms: the atria receive blood while the ventricles are in systole (right atria from the inferior and superior vena cava, and the left atria from the pulmonic circulation); the ventricles receive blood from the atria when the atria are in systole. Again, there is some minutiae we can suss out if you'd like, but you can conceptualize it like this.

Ventricular Systole (squeezing): the AV valves are closed during this time while the semilunar valves are mostly open -- they have to generate enough force to open the valves (aka "afterload" -- specifically LV).

Ventricular Diastole (relaxing): the AV valves open and atria contract to fill the ventricles with blood. The relaxed ventricles receive the blood from the atria.

Again, this is an extremely general way to look at it. I can go over a Wigger's Diagram and/or left ventricular Flow-Volume Loops with you & we can cover the cardiac cycle in depth, if you'd like. You'll be miles ahead of your classmates then and you'll understand the cardiac cycle so much better!

Answer 2

Great question.

S1 or Lub is when the atria contracts. Blood moves from atria to ventricle.

S2 or Dub is when the ventricles contract. Blood moves from Right ventricle into pulmonary vasculator. Blood moves from left ventricle out into the body.

Hope that helps.

If you need further assistance, I am a nursing instructor and would love the opportunity to tutor you.

Misti

Answer 3

You are correct in that lub is the S1 sound and this coordinates with the sound of the mitral and tricuspid valve closing and the start of systole. S2 "dub" is the sound of the pulmonary and the aortic valve closing and the end of systole.

Therefore, between S1 and S2 is systole which is ventricular contraction and the time between S2 and S1 again is ventricular filling.

For your question, between S1 and S2 the left and right ventricles are contracting and the blood is leaving the right ventricle towards the lungs and the left ventricle to the body via the aorta.

Between S2 and S1 sounds the ventricles are being filled from the left and right atrium.

Answer 4

I sent you incorrect information about blood moving through the heart. I originally said blood moves from the right atrium to the left "ventricle" but I should have said...."from the right atrium to the right ventricle. Please note my correction.

Many years ago there was no way to correct for what was called a "blue baby", infants with a hole in the septum that divided the two lower chambers. Blood would bypass the lungs, so there was insufficient oxygen in the system hence the bluish color. With the heart lung machine, surgeons were able to stop the heart, repair the hole and reestablish the correct path of blood.

Medications for high blood pressure or hypertension include beta blockers and calcium channel blocking drugs such as "carvidilol" and "lysinopril"