Physiology of Heart sounds made simple - USMLE Step 1
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- čas přidán 17. 07. 2017
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Physiology of Heart sounds made simple - USMLE step 1
Heart sounds are the noises generated by the mechanical actions of the heart, such as the closing of heart valves and the flow of blood through the heart chambers. Understanding the physiology of heart sounds is crucial for medical students preparing for the USMLE Step 1, as it forms the basis for interpreting normal and abnormal heart sounds in clinical practice. There are two main heart sounds, S1 and S2, and two additional sounds, S3 and S4, which may be heard in certain conditions.
S1 (First heart sound):
S1 is produced by the closure of the atrioventricular (AV) valves, specifically the mitral valve and tricuspid valve, at the beginning of ventricular systole. It marks the onset of ventricular contraction and is generally described as a "lub" sound. S1 is best heard at the apex of the heart, which is typically located at the 5th intercostal space, just medial to the midclavicular line.
S2 (Second heart sound):
S2 is generated by the closure of the semilunar valves, specifically the aortic valve and pulmonary valve, at the end of ventricular systole. It marks the onset of ventricular relaxation (diastole) and is generally described as a "dub" sound. S2 is best heard at the left upper sternal border (aortic area) and left lower sternal border (pulmonic area).
S3 (Third heart sound):
S3 is an abnormal heart sound that may be heard in some conditions, such as heart failure. It is produced by the rapid filling of the ventricles during early diastole, causing vibrations in the ventricular walls. S3 is typically described as a "gallop" rhythm and is best heard with the bell of the stethoscope at the apex of the heart with the patient in the left lateral decubitus position.
S4 (Fourth heart sound):
S4 is another abnormal heart sound that may be heard in certain conditions, such as hypertension or aortic stenosis. It is produced by the vibration of the ventricular walls during atrial contraction in late diastole when the ventricles are resistant to filling. S4 is also described as a "gallop" rhythm and is best heard with the bell of the stethoscope at the apex of the heart with the patient in the left lateral decubitus position.
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Sir, thank you for giving clear conception.
this dr is great. he is so clear.
Again a super video by Bhanu Prakash Sir..!
Awesome delivery sir...
wow this really helped me ,, thankyou so much doc
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Thnk u Sir for such clarification of lesson.
Great contribution dr
Thank you so much sir ❤
Very well explained
Thank you very much
Very impressive!
Tq Soo....much Sir. it's very useful.
Superb lecture
Excellent lecture Sir.
Very nice
Thanks a lot 🙏🏻
You are genius Sir..
Your lecture is very helpful for clear concept...
thank u
Thankz a lot sir
very nice lecture sir
1st time I watch ur whole video...n it was amazing to understand d ❤️ sound ....thnq so much 🙂,..keep going sir 🙏
that's nice
Question: Hello, how is there S1 physiologic splitting ? I thought that happened during inspiration but for S2 ? 03:10 ish
You way of teaching is beautiful ❤️
Wow, thank you
V well explained 🏆🎧
Great ...thanku...Love from Pakistan... regards Dr Raheela
most welcome
Thanks All of you God bless all of you
Superb sir ❤️
Very nice video sir
thanks, you are really knowledgeable and explain the things good 👏
Tysm
Be yourself first 🫡
Nice explanation sir.Thank you.Sir ,how we will know which one is A2 & which one is P2?
Thank u so much sir🙏
All the best
Thank you so much sir ☺️💕
Ur most welcome
thankyou sir !!!
Ur most welcome
Tnk u sir.very good explanation of cardiac sound but one thing that is missing is " diagram" that is very helpful for student.
Noted
Thanks you for video ☺️
My pleasure 😊
Excellent sir
Thank u
You the best dactor
TYSM
Thank you sir❤
Most welcome
Awesome sir .
Love from PAKISTAN
Thank u so much
Possible explain from essential
Sir love from nalgonda
Tysm
Sir from which state you are
Telangana
very nice sir
me aapse coaching Krna chahta hu
where are you leaving sir
contact number mil skte. hai kya aapke
Sir do some videos in telugu
Hello sir,I have a small doubt.S4 is produced in atrial systole then why it is called as Diastolic sound???.
Because atrial systole is the last phase of ventricular diastole
Sir plz explain murmurs
Sure
@@doctorbhanuprakash thnk u
Thank you sir 🙏
Most welcome