November 1, 1976Journal of Applied Physiology
Impedance cardiography for determination of stroke index
Key result
Impedance cardiography correlates with dye-dilution for stroke index but yields lower values and unreliable changes.
- r=0.49
- P<0.001
- n=17
Why the study?
The reliability of impedance cardiography for determining absolute values and changes in stroke index compared to the dye-dilution technique was uncertain.
Does impedance cardiography reliably determine stroke index compared to the dye-dilution technique in human subjects?
Population
17 subjects with 122 stroke index determinations
Comparison
Impedance cardiography vs dye-dilution technique
Design
Observational study
Authors
Discussion
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Member takes
Implication
Impedance cardiography is unreliable for stroke index; challenges clinical adoption and leaves open validation of alternatives.
Study Design
Type
Observational (n=17)
Structured PICO
Does impedance cardiography reliably determine stroke index compared to the dye-dilution technique in human subjects?
P
Population
17 subjects undergoing 122 determinations of stroke index by impedance cardiography and dye-dilution technique.
E
Exposure
Impedance cardiography
C
Comparator
Dye-dilution technique
O
Outcome
Stroke indexsurrogate
Main Result
Effect estimate: r=0.49
p-value: p=<0.001
Impedance cardiography does not reliably determine absolute values of stroke index or evaluate changes compared to the dye-dilution technique.
Cite This Study
Keim et al. (1976) reported an observational. Impedance cardiography vs. Dye-dilution technique was evaluated on Stroke index determination (r=0.49, p=<0.001). Impedance cardiography for determining stroke index correlated with the dye-dilution technique (r=0.49, P<0.001) but yielded significantly lower absolute values and unreliable changes within subjects.