What is Heart Sound? Types, Nature, Time, Location Of Heart Sound.

 Heart Sound 

- The Sound Produce from Closure Of Valve During Cardiac Activity Known as Heart Sound.

- The Sound is Produced due to backforce Produced by blood During Closure Of Valve.


Two Types Of Heart Sound:



1. Audible Heart Sound : Easily Heard by Stethoscope.


 2 Types :-


   A. First HS :-  Produced During Ventricle Systole                    When Both Atrio-ventricular Valve Close.

        • Nature Of Sound:- Lubb 
          
        • Time:- 0.10 to 0.17 second 

        • Frequency: 25 to 45 Hz
        
        • Location:- On Chest Wall ( between 5th to 6th        intercoastal Of Right and Left Around Sternum).







   B. Second HS :- Produced During Ventricle Systole          When Both Semilunar Valve Close, The Sound            Develop From Vessel.

       • Nature:- Dubb
  
       • Frequency:- 50 Hz
    
       • Time :- 0.10 to 0.14 second.
  
       • Location:- Pulmonary And Aortic Valve Area          On Chest Wall , 3rd Intercoastal Right and Left          From Sternum.




2. Non Audible Heart Sound :- Not Easily Heard by Stethoscope.

  2. Types:- 


     A. 3rd HS:- The Heart Sound Develop From wall Of Ventricle After Second HS. 
It is Developed From Ventricle Wall during Rapid Filling.
    
        • Nature:- Tik
        • Time :- 0.07 to 0.10 second 
        • Frequency:- 1 to 6 Hz
        • Location:- 6th intercoastal in Left from                                             Sternum. 



   B. 4th HS :- It is a type Of Non Audible Heart Sound Develop From Arterial Wall during Arterial Systole.

      • Nature:- Tak
      • Time :- 0.2 to 0.4 second.
      • Frequency:- 1 to 4 Hz
      • Location:- 3rd Intercoastal 1 Cm Left Of                                           Sternum.

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