Journal of medical engineering & technology · 2007
The relationship between vascular expansion of the aorta and pulmonary artery and the genesis of the impedance cardiogram using the technique of sonomicrometry.
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Hayes J K, Peters J L, Hare B D, Baker L E
Аннотация
PRIMARY OBJECTIVE: This prospective animal study aims to evaluate the contribution of the pulmonary artery (PA) and aorta on the morphology of the impedance cardiogram using sonomicrometry.
METHODS: Impedance electrodes were placed around the thorax, aorta and in the oesophagus of five dogs. Sonomicrometry crystals were mounted on the PA and aorta for tracking vascular distension while a Doppler flow probe measured aortic blood flow.
RESULTS: No significant differences (p > 0.05) were recorded between the onset of aortic expansion, aortic blood flow and the start of the impedance dZ/dt signal. Significant differences (p > 0.001) were recorded between the onset of PA expansion and the dZ/dt signal. PA expansion began 41.6 +/- 6.0 ms, 60.7 +/- 7.2 ms and 42.2 +/- 4.9 ms respectively, before surface, aortic and oesophageal impedance recordings.
CONCLUSION: The genesis of the impedance cardiogram is attributed to volumetric expansion of the aorta.
METHODS: Impedance electrodes were placed around the thorax, aorta and in the oesophagus of five dogs. Sonomicrometry crystals were mounted on the PA and aorta for tracking vascular distension while a Doppler flow probe measured aortic blood flow.
RESULTS: No significant differences (p > 0.05) were recorded between the onset of aortic expansion, aortic blood flow and the start of the impedance dZ/dt signal. Significant differences (p > 0.001) were recorded between the onset of PA expansion and the dZ/dt signal. PA expansion began 41.6 +/- 6.0 ms, 60.7 +/- 7.2 ms and 42.2 +/- 4.9 ms respectively, before surface, aortic and oesophageal impedance recordings.
CONCLUSION: The genesis of the impedance cardiogram is attributed to volumetric expansion of the aorta.