|
KMID : 0381219800120040289
|
|
Journal of RIMSK
1980 Volume.12 No. 4 p.289 ~ p.310
|
|
|
Evaluation of cardiac performance with impedance cardiography
|
|
Choi Byung-Kwon
|
|
|
Abstract
|
|
|
Six normal healthy volunteers (Control group) who had spontaneous respiration, were examined their cardiac output, pulse rate & systolic time intervals followingg normal & deep respiration with supine and sitting position by impedance cardiography. And thirteen positive pressure breathing patients who were unconscious & had no respiratory effort in ICU, were compared their cardiac output, pulse rate & systolic time intervals by invasive, carotid plethysmographic, impedance cardiographic & thermodilutional method following positive pressure breathing (IPPV, CPPV; +10 cmH2O) & breath hold state.
By this study I found that:
1. In control group, stroke volume (SV) with sitting position was ca 20% smaller than lying position. The fluctuation of SV following respiratory cycle was greater in sitting position than lying position. That means enough blood volume make smaller fluctuation of right ventricular output following respiratory cycle.
2. Positive pressure breathing (IPPV, CPPV) showed remarkable fluctuation of SV by respiratory cycle. But control group that had spontaneous breathing, showed no significant fluctuation. In IPPV and CPPV group, the fluctuation degree was similar.
3. The stroke index of ICU patient group that measured simultaneous with impedance cardiographic and thermodilutional method, showed very closed correlation coefficiency (r=0.94).
SI, = 0.452(ml) + 0.924 X SIre
4. In positive pressure breathing group, the right ventricular ejection time that measured with impedance cardiography & direct (invasive) method was compared (RVET1/RVET?)
r=0.82 in peak inspiratory state
r=0.71 in expiratory stateAnd left ventricular ejection time was compared with direct (invasive) and carotid plethysmographic method (LVETc/LVETv).
r=0.72 in peak inspiratory phase
r=0.93 in end-expiratory pause phase
At the same time LVET by carotid plethysmography & RVET by impedance cardiographic method was compared that showed r=0.92 in peak inspiratory phase.
5. The right ventricular ejection time was definitely longer than left ventricular ejection time in any respiratory phase, pattern, depth and any positional change.
6. Following respiratory cycle (from peak inspiration?expiration?to end-expiratory pause), changes of LVET & RVET showed opposite direction with sl;ontaneous breathing and CPPV.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|