The literature refers that falls are of multifactorial origin, and some authors have proposed to classify risk factors as intrinsic and extrinsic. To estimate the risk of falls and their association with some intrinsic and extrinsic factors in older adults who receive medical care at the Mexican Institute of Social Security. Case-control study that included individuals of both genders aged ≥ 60 years. Cases were patients who were admitted to the emergency department of a secondary care hospital diagnosed with injury or fracture secondary to a fall; the controls were patients who attended family medicine units. Descriptive, bivariate and multivariate statistical analysis was carried out. The SPSS program, version 22.0, was used. Three-hundred and forty-two patients were included (171 cases and 171 controls). Mean age was 76.1 ± 8.8 years, 66 % were women and 97.1 % had self-reported chronic diseases. Differences were observed in body mass index, in the proportion of cases with cognitive impairment, use of walking devices and dependence to perform basic and instrumental activities of daily living. Vandetanib chemical structure Adjusted multivariate analysis revealed an association between the fall event and cognitive impairment and dependence to perform instrumental activities of daily living. Cognitive impairment and dependence to perform instrumental activities of daily living were associated with the risk of falling.Cognitive impairment and dependence to perform instrumental activities of daily living were associated with the risk of falling. Robotic surgery is a technological advance that is used in multiple surgical specialties in the world. Its acceptance in various areas has been supported by comparative studies with laparoscopic surgery and open surgery. To document the robotic surgery program initial experience in a private hospital of Mexico City by analyzing its results and complications. The first 500 robotic surgeries practiced at ABC Medical Center were included, covering a three-year period (January 2017 to December 2019). The following was documented specialties involved, surgeries broken down by specialty and type of surgery, surgical times, complications and number of doctors involved in the initial experience. Out of 500 patients, 367 (73.4 %) were males and 133 (26.4 %) were females. The three most common surgeries were radical prostatectomy (269), hysterectomy (64) and inguinal repair (33). Average age was 58 years (range 18 to 90 years). A total of 40 certified surgeons from five specialties performed all the procedures. Starting a program in a private medical center has several implications. The creation of a robotic surgery committee made up of certified robotic surgery specialists from each specialty and hospital authorities for the accreditation of guidelines for both certification and recertification of their doctors can benefit programs like ours by creating a center of excellence in robotic surgery and thus reduce complications and improve results.Starting a program in a private medical center has several implications. The creation of a robotic surgery committee made up of certified robotic surgery specialists from each specialty and hospital authorities for the accreditation of guidelines for both certification and recertification of their doctors can benefit programs like ours by creating a center of excellence in robotic surgery and thus reduce complications and improve results. Different optical coherence tomography angiography (OCTA) scanning protocols evaluate the macula. To compare the determination coefficients (R ) between vessel and perfusion densities of two OCTA scanning protocols in order to determine if their metrics could be interchanged. Cross-sectional, prospective, comparative, observational, study between two OCTA scanning protocols (Angioplex, Zeiss) in healthy subjects. The R between central, inner, and full densities (3 x 3 mm protocol) and between central, inner, outer and full densities (6 x 6 mm protocol) was identified, both for vessel and perfusion densities. Seventy-eight eyes were evaluated; subjects' median age was 23 years. There were high R between inner and full densities with the 3 x 3 mm protocol (0.96), between outer and full densities with the 6 x 6 mm protocol (0.96), and between central vessel and perfusion densities (≥ 0.96); R between central vessel and perfusion densities of different protocols was ≤ 0.71. Vessel and perfusion densities have high determination coefficients within a scanning protocol, but not between protocols, given that each one preferentially measures different macular areas. Metrics from different protocols should not be interchanged for follow up.Vessel and perfusion densities have high determination coefficients within a scanning protocol, but not between protocols, given that each one preferentially measures different macular areas. Metrics from different protocols should not be interchanged for follow up. Whether there is an influence of the ABO blood system on SARS-CoV-2 infection is unknown. To analyze if there is an association between the ABO system antigens and susceptibility to and severity of SARS-CoV-2 infection. The frequency of ABO system antigens was compared in 73 confirmed cases of SARS-CoV-2 infection and 52 clinically healthy donors. Infection severity was assessed by comparing the frequency of antigens by disease severity and mortality. The risk of suffering from SARS-CoV-2 infection increases in subjects with A vs. non-A antigen (OR = 1.45; 95 % CI 1.061-1.921). Blood phenotype O reduces the risk of SARS-CoV-2 infection (OR = 0.686; 95 % CI 0.522-0.903). No differences were found regarding disease severity. In critically ill patients, the risk of mortality increased in subjects with A vs. non-A antigen (OR = 3.34; 95 % CI 1.417-8.159). Blood group A is a risk factor for SARS-CoV-2 infection, but not for disease severity, although in critically ill patients it is a risk factor for mortality.Blood group A is a risk factor for SARS-CoV-2 infection, but not for disease severity, although in critically ill patients it is a risk factor for mortality.