title: Evaluation of Impedance Cardiography for Measurement of Stroke Volume in Congenital Heart Disease.
abstract: Noninvasive measurement of cardiac output (CO) and particularly stroke volume (SV) remain difficult but potentially valuable. These variables can be particularly challenging to measure in children with congenital heart disease (CHD). Impedance cardiography (IC) is a technique shown to be accurate in measuring SV in adults and in children with structurally normal hearts. The ease of use and rapidity of SV measurement using IC makes it potentially attractive for young patients with CHD. Advances in IC technology have led to more sophisticated signal-morphology IC (SMIC) devices that may further improve accuracy. We tested the accuracy of SMIC to measure SV in 21 subjects with CHD by comparing measurements with those from cardiac magnetic resonance (CMR) imaging. There was good agreement between SMIC and CMR in measurement of SV: mean difference = 1.7 ml (p = 0.47); r = 0.89. The agreement and correlation persisted when controlling for the differences in blood pressure and heart rate during the two testing methods. We conclude that SMIC is accurate at measuring SV and thus CO when compared to CMR in a variety of forms of CHD.
authors: Division of Cardiology, Department of Pediatrics, University of California San Diego, Rady Children's Hospital San Diego, 3020 Children's Way, MC 5004, San Diego, CA, 92123, US.
authors: Mohammed
authors: M
authors: Ebrahim
authors: Division of Cardiology, Department of Pediatrics, University of California San Diego, Rady Children's Hospital San Diego, 3020 Children's Way, MC 5004, San Diego, CA, 92123, US.
authors: Sanjeet
authors: S
authors: Hegde
authors: Division of Cardiology, Department of Pediatrics, University of California San Diego, Rady Children's Hospital San Diego, 3020 Children's Way, MC 5004, San Diego, CA, 92123, US.
authors: Beth
authors: B
authors: Printz
authors: Division of Cardiology, Department of Pediatrics, University of California San Diego, Rady Children's Hospital San Diego, 3020 Children's Way, MC 5004, San Diego, CA, 92123, US.
authors: Mark
authors: M
authors: Abcede
authors: Clinical and Translational Research Institute, University of California San Diego, San Diego, CA, US.
authors: James A
authors: JA
authors: Proudfoot
authors: Division of Cardiology, Department of Pediatrics, University of California San Diego, Rady Children's Hospital San Diego, 3020 Children's Way, MC 5004, San Diego, CA, 92123, US. cdavis@rchsd.org.
authors: Christopher
authors: C
authors: Davis
mesh_terms: D002302:Cardiac Output; D002307:Cardiography, Impedance; D006331:Heart Diseases; D006801:Humans; D008279:Magnetic Resonance Imaging; D013318:Stroke Volume
keywords: Cardiac output; Congenital heart disease; Impedance cardiography; Strove volume