Dr. Alvarado-Livacic, Cristobal

Objective This study investigated the role of oxidative damage and nitric oxide (NO) synthases in the fetal heart using a model of intrauterine growth restriction induced by uteroplacental circulation restriction (UCR). Methods New Zealand white rabbits kept under 12-h light cycles, with food and water provided ad libitum, were subjected at day 25 of pregnancy to 40–50% uteroplacental artery ligation. We analyzed the gene expression of enzymes linked to nitric oxide synthesis (iNOS, eNOS, HO-1, and ARG-2), hypoxia inducible factor 1 alpha (HIF-1α), and the state of oxidative stress (protein carbonyl levels) in fetal heart homogenates. Additionally, we studied the histological morphology of the fetal heart. Results We found that fetal growth restriction was associated with a significant reduction in heart weight but a normal heart/body weight ratio in UCR animals. Hematoxylin and eosin staining showed normal left and right ventricular thickness but increased vessel dilatation with hyperemia in the hearts of the UCR group. We observed HIF-1α, eNOS, p-eNOS, and iNOS induction concomitant with intensified protein carbonyl levels but observed no changes in HO-1 or ARG-2 expression, suggesting increased NO and oxidative stress in the hearts of UCR animals. Conclusion Uteroplacental circulation restriction increased NO-linked enzymes, oxidative damage, and dilated coronary vessels in fetal hearts.

Objective: Telemedicine arises as an attractive intervention for reducing the waiting time for appointments with medical specialists in Chile. Successful implementation of this technology requires safeguarding the patient/clinician trust relationship; however, no studies have been conducted to evaluate quality perception of a telemedicine program in Chile. To assess patient satisfaction with the Teleneurology program at the Hospital Higueras Talcahuano (HHT), addressing patient/clinician trust relationship. Results: A perception survey was constructed with 23 questions, distributed into 5 key areas (items) of user satisfaction. Its face validity was performed by five neurology specialists from the Teleneurology unit of HHT. The survey was applied to 167 patients of the HHT, recruited between 2018 and 2019, for conducting a pilot cross-sectional descriptive study to assess internal consistency (Cronbach alpha) and reliability (factorial analysis of main components). The survey showed an internal consistency of 0.88. Removing any of the items maintained its reliability in values over 0.8. All items showed point biserial correlations greater than 0.30. Overall, the survey constructed and evaluated in this study showed high internal consistency and reliability values, which will allow its application in further studies of quality assessment of the Teleneurology unit of HHT.