Cardiology Research, ISSN 1923-2829 print, 1923-2837 online, Open Access
Article copyright, the authors; Journal compilation copyright, Cardiol Res and Elmer Press Inc
Journal website https://www.cardiologyres.org

Original Article

Volume 2, Number 2, April 2011, pages 51-57

Use of Bioimpedance to Assess Changes in Hemodynamics During Acute Administration of CPAP

Figures

Figure 1.
Figure 1. Numerical measurements of cardiac index with increasing PEEP as measured by PAC and TEB in post-operative cardiac surgery patients. PAC, pulmonary artery catheter; PEEP, positive end-expiratory pressure; TEB, transthoracic electrical bioimpedance.
Figure 2.
Figure 2. Percentage change in hemodynamic parameters with increasing PEEP in post-operative CABG patients. PAC, pulmonary artery catheter; PEEP, positive end-expiratory pressure; TEB, transthoracic electrical bioimpedance.
Figure 3.
Figure 3. Percentage change in hemodynamic parameters with CPAP administration. Max CPAP, maximal tolerated CPAP (12 cmH2O, 14 cmH2O, and 18 cmH2O in each respective patient); Min CPAP, minimal CPAP pressure reached before end of study (0 cmH2O, 0 cmH2O and 4 cmH2O for each respective patient).

Table

Table 1. Effect of CPAP on Hemodynamics in Three Patients With Severe OSA
 
No CPAP, Apneas (n = 68)No CPAP, No Apneas (n = 30)Max CPAP, No Apneas (n = 58)P value (Max CPAP, No Apneas vs. No CPAP, No Apneas)
Values are mean ± SD. All values represent NREM (stage 2) sleep in the supine position. CI, cardiac index; CO, cardiac output; HR, heart rate; SV, stroke volume; n, total number of individual time periods analyzed from all three patients.
HR71.9 ± 7.171.8 ± 2.760.9 ± 5.2< 0.0001
SV90.2 ± 12.693.5 ± 4.883.1 ± 6.9< 0.0001
CO6.5 ± 1.16.7 ± 0.45.1 ± 0.6< 0.0001
CI2.8 ± 0.42.9 ± 0.12.3 ± 0.3< 0.0001