1. 
   Presystolic
   Pre`sys·tol'ic adjective (Physiol.) Preceding the systole or contraction of the heart; as, the presystolic friction sound.
   Found op http://www.encyclo.co.uk/webster/P/157
   
   
2. 
   presystolic
   <physiology> Preceding the systole or contraction of the heart; as, the presystolic friction sound. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?presystolic
   
   
3. 
   presystolic
   (pre″sis-tol´ik) preceding systole.
   Found op http://www.encyclo.co.uk/local/21001
   
   
4. 
   Presystolic
   • (a.) Preceding the systole or contraction of the heart; as, the presystolic friction sound.
   Found op http://thinkexist.com/dictionary/meaning/presystolic/
   
   
5. 
   presystolic
   Type: Term Pronunciation: prē′sis-tol′ik Definitions: 1. Late diastolic, relating to the interval immediately preceding systole.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=72015
   
   

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