IN APRIL 1958, the author first succeeded in catheterizing the left atrium of a patient percutaneously by piercing the interatrial. septum from the groin with a long, curved, 17-gauge needle and advancing the ensheathing 7-French plastic catheter over the needle and into the left atrium.' Fine polyetlhylene tubing could then be threaded through the transseptal catheter without any danger of amn...

IN APRIL 1958, the author first succeeded in catheterizing the left atrium of a patient percutaneously by piercing the interatrial. septum from the groin with a long, curved, 17-gauge needle and advancing the ensheathing 7-French plastic catheter over the needle and into the left atrium.' Fine polyetlhylene tubing could then be threaded through the transseptal catheter without any danger of amn...

T HE development and application of technics for catheterization of the left side of the heart are proving of increasing importance in the study of patients with many types of cardiovascular disease. Two methods of left atrial puncture are commonly employed. The transbronchial method, devised by Allison and Linden' 2 and Facquet et al.3 and the posterior percutaneous route employed first by Bjo...

IN APRIL 1958, the author first succeeded in catheterizing the left atrium of a patient percutaneously by piercing the interatrial. septum from the groin with a long, curved, 17-gauge needle and advancing the ensheathing 7-French plastic catheter over the needle and into the left atrium.' Fine polyetlhylene tubing could then be threaded through the transseptal catheter without any danger of amn...

IN APRIL 1958, the author first succeeded in catheterizing the left atrium of a patient percutaneously by piercing the interatrial. septum from the groin with a long, curved, 17-gauge needle and advancing the ensheathing 7-French plastic catheter over the needle and into the left atrium.' Fine polyetlhylene tubing could then be threaded through the transseptal catheter without any danger of amn...

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IN APRIL 1958, the author first succeeded in catheterizing the left atrium of a patient percutaneously by piercing the interatrial. septum from the groin with a long, curved, 17-gauge needle and advancing the ensheathing 7-French plastic catheter over the needle and into the left atrium.' Fine polyetlhylene tubing could then be threaded through the transseptal catheter without any danger of amn...