Mechanical response of the left ventricle during AC induced hemodynamic collapse

Medical equipment can unintentionally allow the flow of small amounts of AC current through the patient causing hemodynamic collapse without fibrillation. This study examines the mechanical response of the left ventricle during AC induced hemodynamic collapse. Six dogs received 5 seconds of AC curre...

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Bibliographic Details
Published inComputers in Cardiology pp. 701 - 703
Main Authors Hoffmeister, B.K., Sexton, J.A., Sheals, B.S., de Jongh, A.L., Malkin, R.A.
Format Conference Proceeding
LanguageEnglish
Published IEEE 2002
Subjects
Area measurement
Biomedical equipment
Catheters
Dogs
Heart
Hemodynamics
Thickness measurement
Ultrasonic imaging
Ultrasonic variables measurement
Volume measurement
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Summary:Medical equipment can unintentionally allow the flow of small amounts of AC current through the patient causing hemodynamic collapse without fibrillation. This study examines the mechanical response of the left ventricle during AC induced hemodynamic collapse. Six dogs received 5 seconds of AC current stimulation ranging from 4-160 Hz and 10-1000 /spl mu/A to the right ventricle. A quadripolar catheter was placed in the apex of the left ventricle to measure left ventricular volume. Short-axis ultrasound images were recorded to measure left ventricular cross sectional area and wall thickness. Our results showed that the mean volume of the left ventricle during collapse was significantly smaller (p < 0.05) than the mean volume preceding collapse. Cross sectional area also decreased significantly and wall thickness increased. This suggests that the heart assumes a contracted, systole-like state during collapse.
ISBN:9780780377356
0780377354
ISSN:0276-6547
DOI:10.1109/CIC.2002.1166869