Impedance Cardiograph

2000 ◽  
Vol 15 (2) ◽  
pp. 51-54
Author(s):  
Deborah Barr ◽  
Lee Van Dusen ◽  
Steve Ess ◽  
Julie Plezbert

This study examined pulmonary function of pipers and cardiac adaptation to the playing of the Great Highland bagpipe. Pipers (n = 13) of varying ages (31-65 years) and playing experiences (2-20+ years) were evaluated for vital capacity (VC), maximal voluntary ventilation (MVV), and forced vital capacity (FVC) using a RIKO AS-600 spirometer. Subjects were monitored by impedance cardiograph for heart rate (HR), stroke volume (SV), and cardiac output (CO) at rest and during 5 minutes of playing. An automatic blood pressure (BP) monitor collected BP values over the same time period. Eleven weeks after initial cardiac data collection, the BP and cardiac measurements were repeated using the same protocols. Mean values for HR, SV, and CO were calculated for rest and each minute (1-5) of playing. A 2 (data session) by 6 (rest, min 1–5) repeated-measures ANOVA was performed. Analysis revealed a significant overall time effect (p < 0.001) on HR. A-priori contrast comparing all playing times with rest showed significant differences at all time points. Analysis of SV and CO failed to find significance. Heart rate values calculated for percent of maximum ranged from 68% to 89% of maximum overall while playing (session 1) and from 55% to 81% of maximum (session 2). Predicted percent of maximum values for VC and MVV found 77% of players above their maximum predicted values.


PEDIATRICS ◽  
1971 ◽  
Vol 47 (5) ◽  
pp. 870-879
Author(s):  
Zuhdi Lababidi ◽  
D. A. Ehmke ◽  
Robert E. Durnin ◽  
Paul E. Leaverton ◽  
Ronald M. Lauer

In 20 children without shunts or valvular insufficiency, duplicate dye dilution and impedance cardiac outputs (ICO) were carried out. The duplicate dye dilutions had a standard deviation 0.259 L/min/m2, while duplicate ICO had a standard deviation 0.192 L/min/m2 (F = 1.82, p &lt; 0.05). Of 53 sequential estimates, cardiac outputs measured by both indicator dye dilution and ICO had a 5.5% mean difference. In 21 subjects with left to right shunts, the ICO related well with pulmonary blood flow (r = 0.92) rather than systemic flow (r = 0.21). In 13 subjects with aortic insufficiency, sequential Fick and ICO had a 50% mean difference; the impedance measurement was found to be higher in every case. These data indicate that the impedance cardiograph can provide a noninvasive measure of cardiac output when there are no shunts or valvular insufficiencies. In subjects with left to right shunts the impedance cardiograph provides a measure of the pulmonary blood flow. When aortic insufficiency exists the impedance cardiograph is distorted such that it is consistently higher than Fick cardiac output.


1995 ◽  
Vol 20 (3) ◽  
pp. 218-223 ◽  
Author(s):  
JOSEPH M. VAN DE WATER ◽  
XIANG WANG

2020 ◽  
Vol 44 (1) ◽  
pp. 20-25
Author(s):  
Jyoti V. Jethe ◽  
T. S. Ananthakrishnan ◽  
G. D. Jindal

1995 ◽  
Vol 23 (10) ◽  
pp. 1786 ◽  
Author(s):  
William C. Shoemaker

2000 ◽  
Vol 82 (4) ◽  
pp. 313-320 ◽  
Author(s):  
Anne Charloux ◽  
Evelyne Lonsdorfer-Wolf ◽  
Ruddy Richard ◽  
Eliane Lampert ◽  
Monique Oswald-Mammosser ◽  
...  

2019 ◽  
Author(s):  
Chad Danyluck ◽  
Elizabeth Page-Gould

Abstract This protocol describes procedures for conducting a dyadic, psychophysiological study. The key goal of this study is to continuously and simultaneously measure electrocardiograph and impedance cardiograph data from two participants engaged in a social interaction. The social interaction was framed as competitive or cooperative but the task partners engaged in was identical across conditions. The entire protocol takes 2 hours to complete.


1988 ◽  
Vol 67 (Supplement) ◽  
pp. 88 ◽  
Author(s):  
J K Hayes ◽  
K W Smith ◽  
L E Baker

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