Monitoring of mixed venous oxygen saturation and pressure from biosensors in the right ventricle. A 24 hour study in patients with heart failure.
Right ventricle venous oxygen saturation was studied in 10 heart failure patients over 24 h using a lead equipped with an oxygen biosensor inserted temporarily. At the same time a pressure sensor, incorporated in the same lead to measure right ventricular pulse pressure and maximum positive and negative rate of pressure development (RV dP/dt), was tested to see whether it would interfere with the oxygen sensor. Data from the biosensor lead were continuously compared with mixed venous oxygen saturation obtained from a fibreoptic Swan-Ganz catheter with the tip in the pulmonary artery. For reference, blood samples were drawn at regular intervals from this catheter. A provocative protocol was used to cause haemodynamic changes. There was good correlation between oxygen saturation in the right ventricle (biosensor-derived) and mixed venous oxygen saturation in the pulmonary artery (fibreoptic-derived) (r = 0.86) and between sensor-obtained right ventricular oxygen saturation and oxygen saturation in the blood samples from the pulmonary artery (r = 0.90). Changes in central haemodynamics were also well reflected by changes in pulse pressure and dP/dt derived from the pressure sensor. As it was not possible to obtain absolute pressures no attempt was made to compare the pressure changes with conventional haemodynamics. These 24 h haemodynamic measurements suggest that a biosensor-equipped lead placed in the right ventricle could be a valuable tool for long-term monitoring of mixed venous oxygen saturation and pressure in patients with congestive heart failure.
Ohlsson
A
A
Department of Cardiology, Karolinska Hospital, Stockholm, Sweden.
Beck
R
R
Bennett
T
T
Nordlander
R
R
Rydén
J
J
Aström
H
H
Rydén
L
L
D000368:Aged; D015374:Biosensing Techniques; D004867:Equipment Design; D006333:Heart Failure / Q000503:physiopathology*; D006352:Heart Ventricles / Q000503:physiopathology; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000295:instrumentation* / Q000379:methods; D010100:Oxygen / Q000097:blood*; D012680:Sensitivity and Specificity; D017725:Ventricular Pressure / Q000502:physiology*
D010100:Oxygen