A new instrument to obtain biopsy specimen of endocardium and myocardium was devised. More than 10 biopsy specimens were obtained from 5 patients without any untoward effect. The method is quite safe and useful in making an accurate diagnosis in cases in which the causes of diseases were uncertain.It is possible to obtain the specimens from the heart by inserting the instrument through left besilic vein to right heart and via left axillary artery to the left.
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