Modeling and control of an invasive mechanical ventilation system using the active disturbances rejection control structure.

We propose a mandatory invasive mechanical ventilator prototype for severe COVID-19 patients with volume and pressure control operation modes. This system comprises basic pneumatic elements and sensors. Its performance is similar to commercial equipment, and it presents robustness to external disturbances and parametric uncertainties.

[Preeclampsia: main maternal risk factor for low weight in preterm newborn].

Background: In 3 to 8% of pregnancies there are preeclampsia, and it is considered an irreversible disease that affects several organs, and causes injuries in fetus and mother alike.

Objective: To identify maternal risk factors related to low birth weight in preterm newborns born at Hospital de Ginecología-Pediatría con Medicina Familiar no. 31 from IMSS, at Mexicali, BC, Mexico.