Gac Med Mex
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Distraction osteogenesis is a process of induced bone generation. Various protocols have been described for the management of the latency period, distraction speed and consolidation period, with greater or lesser success. ⋯ The sequential histological study allowed to observe the appearance of cellular elements (osteocytes, osteoclasts, osteoid matrix, trabeculate, etc.) and their participation in granulation tissue, newly-formed bone and compact mature bone.
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Humans are exposed every day to innumerable external stimuli, both environmental and microbial. Immunological memory recalls each specific stimulus and mounts a secondary response that is faster and of a larger magnitude than the primary response; this process constitutes the basis for vaccine development. ⋯ Memory T cells have an important role in the resolution of COVID-19, and they are key pillars of immunological memory. In this review, we summarize the main findings regarding anti-SARS-CoV-2 memory T cells after infection, after vaccination, and after the combination of these two events ("hybrid immunity"), and analyze how these cells can contribute to long-term protection against the infection with SARS-CoV-2 variants.
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Comparative Study
Complications of twin pregnancy by assisted reproductive techniques compared with spontaneous.
Twin pregnancy through assisted reproduction techniques is increasing, as are the associated complications. ⋯ Twin pregnancy due to ART increases the risk of maternal and perinatal complications, which forces us to improve prenatal control with a risk approach.
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In developed countries, most of the neurologists use pericranial nerve blocks to treat headache patients, nevertheless, the knowledge and use patterns of this technique in developing countries are unknown. ⋯ The knowledge and use of pericranial nerve blocks for the treatment of headaches in Mexico is low. Stakeholders should develop strategies to improve the field of headache disorders in Mexico.