A quantitative study on interocular transfer in the rabbit.
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Animals↗
Biomedical subjects
F Van Der Mark
Publications and source records attributed to F Van Der Mark.
Pulmonary valve incompetence. I. Evaluation using electromagnetic flow velocity catheters and a new valve insufficiency analyser.
In animal experiments regurgitant flow through competent and incompetent pulmonary valves was evaluated with electromagnetic flow velocity catheters by using the ratio of the separately integrated backward and forward flow velocity signals. This ratio was obtained with a special purpose analog computing circuit set by an in-vitro zero flow reference signal, which was in good agreement with in-vivo zero flow signals.
Animals↗
Pulmonary valve incompetence. II. Application of electromagnetic flow velocity catheters in children.
During cardiac catheterization in 49 children regurgitant flow through competent and incompetent pulmonary valves was evaluated with electromagnetic flow velocity catheters using the ratio of the separately integrated backward and forward flow velocity signals (vb/vf). When the pulmonary valve was normal, vb/vf was less than or equal to 0.10. After operation for pulmonary valve stenosis or tetralogy of Fallot larger values were often found. In patients with an outflow patch across the pulmonary valve ring vb/vf values of up to 0.54 were found.
Adolescent↗