Abstract
Summary
(a) Fluorocardiography during normal respiration is possible by the use of an additional electrical filter, the physical basis and principle of which are given.
(b) By using the filter, it is possible to record the fluorocardiogram of the child. This is of particular importance in congenital heart diseases.
(c) By using the filter, it is possible to study dyspneic cases of emphysema, pulmonary fibrosis, or congestive failure.
(d) The use of the filter eliminates those slow waves of cardiac origin which may interfere with other rapid cardiac waves whose study is more important in particular cases.
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