Migration of covered stents from hemodialysis A-V access to the pulmonary artery: percutaneous stent retrieval and procedural trends.

Details are presented of two patients with end-stage renal disease (ESRD) who recently experienced migration of a Viabahn covered stent from a peripheral hemodialysis A-V access to the right lower lobe pulmonary artery. Successful percutaneous retrieval was achieved in one patient using a dual snare approach, facilitated by ex vivo product testing. The second patient was managed conservatively.

Ulnar artery cannulation for coronary angiography and percutaneous coronary intervention: case reports and anatomic considerations.

Transradial artery cannulation is a useful alternative approach to the performance of diagnostic and interventional coronary procedures. However, its utility can be limited by incomplete palmar collateral support, access site failure, and anatomic variations. We report on five patients in whom percutaneous cannulation of the ulnar artery was primarily chosen, based on preprocedure examination, for coronary angiography in three patients and percutaneous coronary intervention in two others.

Effects of hyperventilation on pulmonary blood flow and recirculation time of humans.

We used direct invasive techniques to measure the effects of hyperventilation on the pulmonary blood flow (Q) and on recirculation time of helium and of carbon dioxide in humans. The subjects hyperventilated with a tidal volume of 1.5 liters (BTPS) and a frequency of 20 or 30 breaths/min.

Bilateral atrial myxomas. Echocardiographic considerations.

In this report we describe a patient with bilateral atrial myxomas, which were diagnosed preoperatively by echocardiography and angiography, and successfully removed. The excised tumor mass consisted of mobile right and left atrial myxomas connected by a common stalk which passed through the atrial septum, collectively resembling the shape of a dumbbell. Preoperative echocardiographic and angiographic observations were instrumental in planning the surgical approach, and correlated well with intraoperative findings and with the anatomic configuration of the intact pathologic specimen.