Validation of noninvasive pulse contour cardiac output using finger arterial pressure in cardiac surgery patients requiring fluid therapy.
BACKGROUND
Nexfin (Edwards Lifesciences, Irvine, CA) allows for noninvasive continuous monitoring of blood pressure (ABPNI) and cardiac output (CONI) by measuring finger arterial pressure (FAP). To evaluate the accuracy of FAP in measuring ABPNI and CONI as well as the adequacy of detecting changes in ABP and CO, we compared FAP to intra-arterially measured blood pressure (ABPIA) and transpulmonary thermodilution(COTD) in post cardiac surgery patients during a fluid challenge (FC).


METHODS
Twenty sedated patients post cardiac surgery were included, and 28 FCs were performed. Measurements of ABP and CO were simultaneously collected before and after an FC, and we compared CO and blood pressure.


RESULTS
Finger arterial pressure was obtainable in all patients.When comparing ABPNI with ABPIA, bias was2.7 mm Hg (limits of agreement [LOA], ± 22.2), 4.9 mm Hg (LOA, ± 13.6), and 4.2 mm Hg (LOA, ±13.7) for systolic,diastolic, and mean arterial pressure, respectively. Concordance between changes in ABPNI and ABPIA was 100%.Mean bias between CONI and COTD was -0.26 (LOA, ± 2.2), with a percentage error of 38.9%. Concordance between changes in CONI vs COTD and was 100%.


CONCLUSIONS
Finger arterial pressure reliably measures ABP and adequately tracks changes in ABP. Although CONI is not interchangeable with COTD, it follows changes in CO closely.
Charlotte
C
Hofhuizen
Benno
B
Lansdorp
Johannes G
JG
van der Hoeven
Gert-Jan
GJ
Scheffer
Joris
J
Lemson
D000368:Aged; D000369:Aged, 80 and over; D062186:Arterial Pressure / Q000502:physiology*; D001795:Blood Pressure Determination; D002302:Cardiac Output / Q000502:physiology*; D006348:Cardiac Surgical Procedures; D005260:Female; D005385:Fingers; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods*; D054928:Validation Studies as Topic