Prolonged Bypass with Membrane Oxygenator

Recirculation also is desirable for other reasons. Every hour or so we turn up to a very high recirculation rate for a few seconds to force the blood through rapidly and thereby open up all the capillaries.

Since our heating is done with an infrared lamp directed on the oxygenator, i t would be undesirable to stop the flow and allow hot spots to develop that might burn the blood, so it is just as well to keep some blood circulating all the time. Finally, the recirculation pump is useful in clearing bubbles from the priming fluid. Incidentally, we are also looking into the advantages of connecting the oxygenator in series, again taking advantage of the low resistance.

Dr. Trinkle made a very interesting comment about his form of left ventricu- lar assist. We believe our system also is useful for assisting patients in cardiogenic shock.

NOTICE FROM THE BO14RD OF THORACIC SURGERY

The 1971 spring examinations will be given as follows: Written Examination. T o be held at various centers throughout the country

on February 12, 1971. Final date for filing applications is December 1, 1970. Oral Examination. To be given in April, 1971, in Atlanta, Ga. Final date

for filing applications is December 1, 1970. A fee increase went into effect July 1, 1970, and all applications are now sub-

ject to the new rates. The registration fee is $50 and the examination fee is $250. Please address all communications to the Board of Thoracic Surgery, Inc.,

14624 East Seven Mile Road, Detroit, Mich. 48205.

VOL. 10, NO. 5 , NOVEMUER, 1970 423