PMID- 8218620
OWN - NLM
STAT- MEDLINE
DCOM- 19931203
LR  - 20191023
IS  - 0301-0511 (Print)
IS  - 0301-0511 (Linking)
VI  - 36
IP  - 1-2
DP  - 1993 Aug
TI  - Use of noninvasive bioelectric impedance to predict cardiac output in open heart 
      recovery.
PG  - 23-32
AB  - Cardiac outputs (CO) measured by bioelectric impedance (Z) and thermodilution 
      (TD) were compared in ten stable, non-ventilated male coronary artery bypass 
      patients (mean age 59 +/- 12 years) in an open heart recovery unit. The 
      measurements were obtained blindly in three sequential body positions (supine, 45 
      degrees, final supine) using either a calculated value for resistivity (p) (based 
      upon hematocrit with blood sampled at the time of the study) to estimate CO(Z), 
      or assumed values of p = 135.5 omega cm and p = 150 omega cm. The results 
      indicate high correlations between the two measurement methods (range: r = 0.97 
      to 0.99) in the initial supine position for all resistivity conditions followed 
      by a progressive decline when body position was changed to 45 degrees and supine 
      (range: r = 0.74 to 0.90). The highest overall correlations and closest absolute 
      mean cardiac output values were obtained when p was calculated from actual 
      hematocrit values obtained at the time of the study. Applying a two-way ANOVA to 
      assess the simultaneous effects of method (TD vx. Z) and position change (supine, 
      45 degrees, supine), no significant main effects or interactions were found when 
      cardiac output values were estimated using the calculated measurement of p. 
      However, significant main effects of method were found when p was assumed to be 
      either 135.5 omega cm (p > or = 0.005) or 150.0 omega cm (p > or = 0.0001), with 
      impedance showing a tendency to overestimate cardiac output. In conclusion, our 
      findings suggest that impedance is a valid method to estimate cardiac output in 
      this subpopulation of patients in open heart recovery provided that p is 
      calculated at the time the study is performed.
FAU - Demeter, R J
AU  - Demeter RJ
AD  - Department of Medical Research, Methodist Hospital of Indiana, Indianapolis 
      46206.
FAU - Parr, K L
AU  - Parr KL
FAU - Toth, P D
AU  - Toth PD
FAU - Woods, J R
AU  - Woods JR
LA  - eng
PT  - Journal Article
PL  - Netherlands
TA  - Biol Psychol
JT  - Biological psychology
JID - 0375566
SB  - IM
MH  - Adult
MH  - Aged
MH  - Aged, 80 and over
MH  - Blood Viscosity/physiology
MH  - Cardiac Output/*physiology
MH  - *Cardiography, Impedance
MH  - *Coronary Artery Bypass
MH  - Coronary Disease/physiopathology/*surgery
MH  - Hematocrit
MH  - Humans
MH  - Male
MH  - Middle Aged
MH  - Postoperative Complications/*physiopathology
MH  - Posture/physiology
MH  - Stroke Volume/physiology
MH  - Thermodilution
EDAT- 1993/08/01 00:00
MHDA- 1993/08/01 00:01
CRDT- 1993/08/01 00:00
PHST- 1993/08/01 00:00 [pubmed]
PHST- 1993/08/01 00:01 [medline]
PHST- 1993/08/01 00:00 [entrez]
AID - 0301-0511(93)90077-L [pii]
AID - 10.1016/0301-0511(93)90077-l [doi]
PST - ppublish
SO  - Biol Psychol. 1993 Aug;36(1-2):23-32. doi: 10.1016/0301-0511(93)90077-l.