Abstract
1. (1) For open intracardiac operations to repair atrial septal defects under hypothermia the patient's body temperature has been lowered by surface cooling to approximately 29 °C (84.5 ° F). Sixty-five patients with atrial septal defects have been operated upon by the technic described and five minutes of cardiac inflow occlusion has been sufficient to repair most of the defects. 2. (2) Hypothermia also provides an effective method for operating on a few other intracardiac defects such as isolated pulmonary stenosis and aortic stenosis under direct vision. 3. (3) Some of the advantages and disadvantages of hypothermia are discussed.
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