Are venous pressures obtained from femoral central lines comparable with pressure readings from neck lines?
© BioMed Central Ltd 2005
Published: 7 March 2005
To evaluate whether femoral (femoro-iliac) venous pressures are comparable with the central venous pressures (CVP) obtained from neck lines. We hypothesised that there would not be a clinically significant difference in the readings, in the absence of intra-abdominal hypertension
Simultaneous measurements were taken from ICU patients who had both femoral and neck (superior veno-caval) central catheters in situ. Only 20 cm femoral lines were considered for the study. Hemodialysis catheters were included in the study. On each occasion, measurements were taken by two independent observers and recorded separately. Intra-abdominal pressures were also measured by the intra-vesical method. We estimated a difference > 2 cmH2O to be clinically significant
Thirty sets of readings were taken from 25 patients. Only two sets had a difference > 2 cm. There was no statistically significant difference between the two groups (P = 0.054, paired t test). The femoro-iliac venous pressures correlated well with the superior vena-caval CVP (r2 = 0.721, P < 0.01).
Venous pressures from femoro-iliac central lines correlated well with CVP taken from neck lines.