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

Claim 0:
1. 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 the step of during rest condition of the patient:
measuring blood flow, Qrest, through the coronary artery; and, further comprising the step of during rest condition or during maximum hyperemia of the patient:
measuring blood pressure, Pa, at a position proximal in the coronary artery or proximally of any stenosis if present; and
further comprising the steps of during maximum hyperemia of the patient:
measuring blood flow, Qmax, through the coronary artery; and
measuring blood pressure, Pd,hyper, at a position distal in the coronary artery or distally of any stenosis if present, wherein the microvascular resistance reserve is determined by the additional step of calculating the microvascular resistance reserve as, M
   ⁢
   R
   ⁢
   R
  
  =
  
   
    
     Q
     max
    
    
     Q
     rest
    
   
   ⁢
   
    
     
      P
      a
     
     
      P
      
       d
       ,
       hyper
      
     
    
    .