{'fraction_non_alphanumeric': 0.02746566791510612, 'fraction_numerical': 0.0, 'mean_word_length': 4.985074626865671, '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}}
[Destruction of the aortic allo- and xenovalves of the heart depending on their position and time of transplantation].

The aortic valve, as well as the other valves of the heart, has a cellular structure. Collagenous fibres form the skeleton of the cellular structures, and the plexus of thinner fibres--the "walls". At early periods following the implantation destruction of thin fibres distributed along the periphery of the alveolus takes place. In the course of prolonged functioning of the allo- and xenovalves in a mitral position the large collagenous fibres collapse, defibration thereof develops and slits-vacuums and "cysts" are formed. In the valves which functioned for a long time in the tricuspid position no considerable destructive changes in the connective-tissue carcass take place.