Correlation Between Noninvasive And Invasive Cardiac Index (Ci): Utilization Of Noninvasive Echocardiographic Doppler-Derived Index Of Myocardial Performance (Imp)

PURPOSE: Dr Tei described a doppler index for the assessment of global left ventricular performance termed the Index of myocardial performance (IMP). IMP encompasses left ventricular (LV) systolic contraction, ejection, and diastolic relaxation, and is independent of heart rate (HR), and mean blood pressure (MBP). Diminished LV function is associated with prolongation of IMP (>0.55 seconds). Doppler IMP can be utilized to calculate CI noninvasively. The purpose of this study was to assess whether noninvasive post-cardiopulmonary bypass (CPB) derived CI calculated by the equation [CI × IMP {pre-CPB} = CI × IMP {post-CPB} correlated with standard invasive thermodilution pulmonary artery catheter (PAC) derived CI.