Atrial Systole

[pathtopenn]

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For all the Cardio guy and gals out there, please clarify this for me.

Atrial Systole is the atrial contrax @ end of ventricular diastole when the AV valve is open. Atrial contrax @ end of filling inc the pressure and results in a small movement of blood from atria into ventricles which is refer to as the kick.

If I remembered right, systole is a passive action, why is there a contraction? Also could someone please explain the purpose of the kick?

Sorry if this seems kind of elementary but I just would like to understand this concept.

Thanks for the help!

 

[septoplasty]

For all the Cardio guy and gals out there, please clarify this for me.

Atrial Systole is the atrial contrax @ end of ventricular diastole when the AV valve is open. Atrial contrax @ end of filling inc the pressure and results in a small movement of blood from atria into ventricles which is refer to as the kick.

If I remembered right, systole is a passive action, why is there a contraction? Also could someone please explain the purpose of the kick?

Sorry if this seems kind of elementary but I just would like to understand this concept.

Thanks for the help!

Atrial systole would occur when the AV valve is closed (Ventricular Filling) which is after the Ventricular systole, not diastole.

I dont think systole is a passive action ( no idea where you must of gotten that info from), I'd think isovolumetric relaxation would be a passive action.

 

[Deceptacon]

i think he meant that the filling of the atria is a passive action. i **think he's confused about how the ventricles fill during diastole and how atrial contraction fits into it... but, i'm not quite sure...

 

[nitpick]

Atrial systole would occur when the AV valve is closed (Ventricular Filling) which is after the Ventricular systole, not diastole.

Guys!!! How come atrial systole occurs when AV valve closed?

Here is the concept-

Atrial Systole---Closure of AV valve(S1)----Ventricle filled so pressure increased than aorta so ----opening of Semilunar valves(aka ejection click if sound more)---Ventricular Systole----Closure of Sem. Valve(S2)----isometric relaxation of ventricle and so pressure decrease than atria and so AV valve opening(Opening Snap) and filling of ventricle(S3)----Rapid emptying of atrial content(S4) ofcourse during Atrial systole.....

I hope this may be helpful... still I am also a student , correct me if I am wrong!!!

 

[septoplasty]

Guys!!! How come atrial systole occurs when AV valve closed?

Here is the concept-

Atrial Systole---Closure of AV valve(S1)----Ventricle filled so pressure increased than aorta so ----opening of Semilunar valves(aka ejection click if sound more)---Ventricular Systole----Closure of Sem. Valve(S2)----isometric relaxation of ventricle and so pressure decrease then aorta and so AV valve opening(Opening Snap) and filling of ventricle(S3)----Rapid emptying of atrial content(S4) ofcourse during Atrial systole.....

I hope this may be helpful... still I am also a student , correct me if I am wrong!!!

AV Systole when AV valve is open wouldn't make sense, if you fill the LV, the blood will directly leak into the aorta, EF will go down aswell.

LAtrial systole --> MV Open---> MV Close--- LV Systole--> AV Open-->AV Close--> LAtrial systole.

S1 sound is from Closure of MV and Tricuspid, not AV.

Are you actually a medical student?

 

[pathtopenn]

Thanks for the clarification, septoplasty but deceptacon is right, that is what i meant to phase the question.

Also could you explain the atrial kick? Our physio guy was kind of ambivalent about that concept. I suspect he may have been drinking when he did that lecture...... actually for all our lectures. Our school we had to self taught physio and we also had the shelf. So our info were kind of crammed in and mostly come from regurgitated facts of BRS with almost no understanding.

Thanks for the reply!

 

[Vagus08]

I think that the atrial kick doesn't occur for some physiologically crucial purpose. Just like the ventricles, the atria depolarize and contract (prior to ventricular systole). As a function of this contraction, whatever remaining blood in the atria that wasn't dumped into the ventricles during diastole is "kicked" out upon atrial contraction. I wouldn't read too much into this concept, beyond understanding the fact that the "kick" occurs just prior to closure of the atrioventricular valves (the point at which ventricular pressure has overcome atrial pressure). Subsequent to this point, the atrioventricular valves are closed, and isovolumetric contraction of the ventricles occurs (i.e. all heart valves are closed), until ventricular pressure exceeds that of the proximal aorta/pulmonary artery (semilunar valves open), etc.

If you look at the cardiac cycle diagram, the right atrial kick corresponds to the "a" wave, and might also coincide with an S4 heart sound in a pathologic condition such as LV failure.

 

[coralis]

AV Systole when AV valve is open wouldn't make sense, if you fill the LV, the blood will directly leak into the aorta, EF will go down aswell.

LAtrial systole --> MV Open---> MV Close--- LV Systole--> AV Open-->AV Close--> LAtrial systole.

S1 sound is from Closure of MV and Tricuspid, not AV.

Are you actually a medical student?

I think you are just confusing the terms they are using. I believe the above posters referred to AV valves as being atrio-ventricular valves (Mitral and tricuspid) and not the aortic valve.

 

[coralis]

Guys!!! How come atrial systole occurs when AV valve closed?

Here is the concept-

Atrial Systole---Closure of AV valve(S1)----Ventricle filled so pressure increased than aorta so ----opening of Semilunar valves(aka ejection click if sound more)---Ventricular Systole----Closure of Sem. Valve(S2)----isometric relaxation of ventricle and so pressure decrease then aorta and so AV valve opening(Opening Snap) and filling of ventricle(S3)----Rapid emptying of atrial content(S4) ofcourse during Atrial systole.....

I hope this may be helpful... still I am also a student , correct me if I am wrong!!!

As a student please make sure you don't learn S3 and S4 sounds are physiologically normal sounds. Also Opening snap is an opening snap of a stenosed mitral valve and NOT S3. S4, usually has to do w/ low ventricular compliance. Anywho, you'll get to those one day, but don't learn them as part of the normal cardiac cycle, it'll only confuse you later.

 

[DRNRPATEL]

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[DRNRPATEL]

AV Systole when AV valve is open wouldn't make sense, if you fill the LV, the blood will directly leak into the aorta, EF will go down aswell.

LAtrial systole --> MV Open---> MV Close--- LV Systole--> AV Open-->AV Close--> LAtrial systole.

S1 sound is from Closure of MV and Tricuspid, not AV.

Are you actually a medical student?

Yeah , I am but you need to study more !!!!! jk... We are always learning.....