{'fraction_non_alphanumeric': 0.015665796344647518, 'fraction_numerical': 0.018276762402088774, 'mean_word_length': 5.295081967213115, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Misleading hyperoxia test.

A 2 day old infant with infracardiac total anomalous pulmonary venous connection achieved an arterial oxygen tension greater than 250 mmHg, breathing 100% oxygen. Diagnosis of cardiac disease was delayed several weeks. The anatomical basis for this phenomenon was streaming of systemic venous return across an inferior vena cava type atrial septal defect.