INTRODUCTION: R-wave obtained from the electrocardiogram depends on ventricular stroke volume. We assessed the relationship between respiratory variations in R-wave (DeltaRDII) and in pulse pressure (DeltaPP) during general anesthesia. METHOD: R-wave amplitude was measured from standard lead II (RDII). Maximal RDII (RDIImax) and minimal RDII (RDIImin) were determined over one respiratory cycle. DeltaRDII was calculated as 100 x [RDIImax-RDIImin]/([RDIImax + RDIImin]/2. DeltaRDII and DeltaPP were simultaneously recorded. RESULTS: There was a significant relationship (r = 0.79; P < 0.001) between DeltaRDII and DeltaPP. A DeltaRDII > 13% detected patients with a DeltaPP > 13% with an 89% sensitivity, and an 88% specificity. CONCLUSION: DeltaRDII and DeltaPP are related in this setting.
INTRODUCTION: R-wave obtained from the electrocardiogram depends on ventricular stroke volume. We assessed the relationship between respiratory variations in R-wave (DeltaRDII) and in pulse pressure (DeltaPP) during general anesthesia. METHOD: R-wave amplitude was measured from standard lead II (RDII). Maximal RDII (RDIImax) and minimal RDII (RDIImin) were determined over one respiratory cycle. DeltaRDII was calculated as 100 x [RDIImax-RDIImin]/([RDIImax + RDIImin]/2. DeltaRDII and DeltaPP were simultaneously recorded. RESULTS: There was a significant relationship (r = 0.79; P < 0.001) between DeltaRDII and DeltaPP. A DeltaRDII > 13% detected patients with a DeltaPP > 13% with an 89% sensitivity, and an 88% specificity. CONCLUSION:DeltaRDII and DeltaPP are related in this setting.
Authors: F Michard; S Boussat; D Chemla; N Anguel; A Mercat; Y Lecarpentier; C Richard; M R Pinsky; J L Teboul Journal: Am J Respir Crit Care Med Date: 2000-07 Impact factor: 21.405
Authors: S Daniels; A S Iskandrian; A H Hakki; S A Kane; C E Bemis; L N Horowitz; A M Greenspan; B L Segal Journal: Am Heart J Date: 1984-04 Impact factor: 4.749