Patent ID: 11963743
Assignee: COROVENTIS RESEARCH AB
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 4:
5. A method for determining microvascular resistance reserve, MRR, in the myocardium perfused by a normal or a stenotic coronary artery of a human patient, which method comprises:
determining a value of Coronary Flow Reserve, CFR, of the coronary artery of the patient;
determining a value of Fractional Flow Reserve, FFR, of the coronary artery of the patient;
determining a value of blood pressure during rest condition of the patient, Pa, rest, at a position proximal in the coronary artery or proximally of any stenosis if present; and
determining a value of blood pressure during maximum hyperemia of the patient, Pa, hyper, at a position proximal in the coronary artery or proximally of any stenosis if present,
wherein the microvascular resistance reserve, MRR, is determined by the additional step of calculating the microvascular resistance reserve as, M
   ⁢
   R
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   R
  
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     C
     ⁢
     F
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     R
    
    
     F
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     F
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     R
    
   
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      P
      
       a
       ,
       rest
      
     
     
      P
      
       a
       ,
       hyper
      
     
    
    .