Mortality predictors in patients with COVID-19 pneumonia: a machine learning approach using eXtreme Gradient Boosting model.

Recently, global health has seen an increase in demand for assistance as a result of the COVID-19 pandemic. This has prompted many researchers to conduct different studies looking for variables that are associated with increased clinical risk, and find effective and safe treatments. Many of these studies have been limited by presenting small samples and a large data set. Using machine learning (ML) techniques we can detect parameters that help us to improve clinical diagnosis, since they are a system for the detection, prediction and treatment of complex data. ML techniques can be valuable for the study of COVID-19, especially because they can uncover complex patterns in large data sets. This retrospective study of 150 hospitalized adult COVID-19 patients, of which we established two groups, those who died were called Case group (n = 53) while the survivors were Control group (n = 98). For analysis, a supervised learning algorithm eXtreme Gradient Boosting (XGBoost) has been used due to its good response compared to other methods because it is highly efficient, flexible and portable. In this study, the response to different treatments has been evaluated and has made it possible to accurately predict which patients have higher mortality using artificial intelligence, obtaining better results compared to other ML methods.

Self-referencing mW-scale detection of sub-ns optical phase modulation in acetylene at 1530 nm.

Application of the phase memory of acetylene (C2H2) vibrational-rotational transitions in the 1520-1540 nm wavelength range for a self-referencing homodyne detection of a sub-nanosecond optical phase modulation is reported. In the proposed configuration the collinearly propagating coherent dipole radiation of the excited molecule acts like a phase-locked reference wave (local oscillator) that enables transformation of the initial phase modulation into the intensity one. This technique does not need high light intensity and can operate in a linear range of the medium optical absorption. The linear optical phase demodulation (i.e., transformation of the phase-to-amplitude light modulation) is interpreted as an introduction of an additional phase shift to the carrier frequency component of the modulated signal in the maximum of the dispersion curve of a narrow optical absorption peak. It has been experimentally demonstrated with the bulk 10 cm long cuvette filled with low pressure (∼2 Torr) acetylene at room temperature. Effective demodulation of the milliwatt-scale incident laser wave of a single- and multi-mode structure is shown. As expected, the response to the fast (<1 ns) phase modulation was quadratic when the acetylene inhomogeneous Doppler-broadened (∼500 MHz) absorption line is excited in its center and was linearized by tuning at one of the absorption line sides. It is of a differentiating (high-pass) type with the cutoff frequency determined by the total spectral width of the utilized absorption line. Expected detection resolution is determined by the photon noise of the incident light intensity.

Tumefacción en región inguinal en varón VIH positivo / Tumefaction in the inguinal region in an HIV-positive male

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Pápulas faciales: un signo de alarma / Facial papules: a warning sign

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Glándulas de Fordyce en cuerpo del pene: un reto diagnóstico / Fordyce glands in the shaft of the penis: a diagnostic challenge

No disponible

Tumefacción labial en varón inmunocompetente / Lip Swelling in an Immunocompetent Man

No disponible

Nódulo umbilical / Umbilical nodule

No disponible

Síndrome de Sweet localizado sobre linfedema: descripción de un caso y revisión de la literatura / Sweet´s syndrome located on lymphoedema: a case report and review of literature

Comunicamos el caso de una mujer de 63 años de edad, que desarrolló lesiones compatibles con un síndrome de Sweet, localizadas en el miembro sometido a linfadenectomía e irradiación, debido a una neoplasia maligna neural. Efectuamos comentarios del caso y los comparamos con la bibliografía publicada.

A 63 years-old woman treated wit lymphadenectomy and radiotherapy due a malignant neural neoplasia, developed lesions of a Sweet's syndrome, localized in the area treated. A review and comparative study of the previous papers are made.

Síndrome de Sweet localizado sobre linfedema: descripción de un caso y revisión de la literatura / Sweet´s syndrome located on lymphoedema: a case report and review of literature

Comunicamos el caso de una mujer de 63 años de edad, que desarrolló lesiones compatibles con un síndrome de Sweet, localizadas en el miembro sometido a linfadenectomía e irradiación, debido a una neoplasia maligna neural. Efectuamos comentarios del caso y los comparamos con la bibliografía publicada.(AU)

A 63 years-old woman treated wit lymphadenectomy and radiotherapy due a malignant neural neoplasia, developed lesions of a Sweets syndrome, localized in the area treated. A review and comparative study of the previous papers are made.(AU)