"ST-elevation myocardial infarction associated with air pollution levels in Mexico City".

Background Coronary heart disease has multiple risk factors, including air pollution. Numerous pathophysiological mechanisms have been identified with increasing levels of air pollution, mainly with ozone (O3), nitrogen dioxide (NO2), sulphur dioxide (SO2), particulate matter (PM10), fine particulate matter (PM2.5) and carbon monoxide (CO). In Mexico, the pollution level is reported using an air quality index called IMECA. Methods All patients with STEMI admitted at Hospital Español were collected between 2012 and 2019 (N = 348). We conducted a retrospective analysis using the air pollution exposure at the time of each event (lag0), the previous 24 h (lag1), 48 h (lag2), 72 h (lag3) and 5-day cumulative lag. The level of air pollution was analyzed independently using IMECA and particle concentrations. The data was divided in two groups: days with one of more STEMI's (MI group) and days free of events (Control group), using ANCOVA to evaluate the difference between means of both groups taking into account confounders. Results: For days with one or more cardiovascular event, a significant increase in SO2 was observed at lag1; similar increase was found in CO, PM2.5, SO2 at lag2. For the 5-day cumulative lag, SO2 and PM2.5 showed a significant increase. No differences were found using the IMECA levels in both groups. Conclusions: The elevated concentrations levels of CO, SO2 and PM2.5 showed significant association with STEMI at different time points before the event. Ozone, PM10 and NO2 showed no difference between groups. IMECA levels showed no association with STEMI in our study.

[HELLP syndrome. Severe consequence of hypertensive disease induced by pregnancy]. / Síndrome de HELLP. Consecuencia severa de enfermedad hipertensiva inducida por el embarazo.

A descriptive, transversal retrospective study was performed, to determine the prevalence of HELLP syndrome among patients with Pregnancy-Induced Hypertension (PIH), who were admitted into the Gynecology and Obstetrics Service the American British Cowdray Hospital in Mexico City, since July 1992 to June 1995. We detected a total or 11 patients who had the diagnostic parameters proposed by Sibaí, those were 11.8% of all the patients with PIH. The medial gestational age was 33 weeks (range from 30 to 39) The mean tensional levels were 170/ 107 mm Hg, in base of platelet count, nine patients were classified as Class I (82%) and two in Class II (18%), the medial peak levels of transaminases and bilirubins was reached 40 hours and that of lactic deshidrogenase 60 hours after the diagnosis was established, while the minimum levels of hematocrit and platelets were at 48 and 57 respectively. The mean weight of the neonates was 1,655 g, the maternal mortality rate was 9% and the perinatal 8.3%, the diagnosis of HELLP syndrome was established before delivery in 40% of the cases and after that in 60%, puerperal HELLP may occur more frequently that is believed. Point out the importance of early detection of this clinic entity in order to establish an opportune and efficient treatment which improves maternal and fetal prognosis.

[HELLP syndrome. Critical state. Current concepts]. / Síndrome de HELLP. Estado crítico real. Conceptos actuales.

The HELLP syndrome is an English acronym, for describing patients with Pregnancy Induced Hypertension (PIH), who also has hemolysis, elevated hepatic enzymes and low platelets, its presence is associated with a frequency of maternal mortality from 5 to 25% and when it is associated with hepatic rupture it increases to 35% and a perinatal one from 30 to 60%. It is present in 2 to 12% among women with PIH. Its etiology has not been elucidated completely, the base of its pathophysiology is an unbalance in prostanoid metabolism which conduces to generalize vasopasm with the subsequent endothelial damage and platelets activation. Sibaí describes the diagnostic parameters of the syndrome. Its initial treatment is the hemodinamic stabilization of the maternal status and the evaluation of fetal well-being for decide whether immediate delivery is indicated. HELLP appears in the puerperium in 30% of the cases. There are both maternal and perinatal severe complications, and a recurrence risk of a 4 to 27%. We emphasize the importance of early detection of the syndrome which improves maternal-fetal prognosis.

[HELLP syndrome as manifestation of pre-eclampsia decompensation during puerperium. 2 case reports]. / Síndrome de Hellp como manifestación de descompensación de la preeclampsia durante el puerperio. Presentación de dos casos.

Two extreme cases of pregnancy-induced hypertension with puerperal HELLP syndrome are presented and the literature is review. HELLP is an English acronym, for describing the preeclamptic or eclamptic patient, who also has hemolysis, elevated hepatic enzymes and low platelets. Its etiology has not been elucidated, but it has been accepted the theory of dysequilibrium in prostanoid metabolism. It has an incidence of 5 to 15% among patients with pregnancy-induced hypertension. Maternal mortality is about 10 to 28% and neonatal of 40%. Owing to fatal complications, treatment consist of interrupting pregnancy. Point out the importance of early detection of this clinic entity, which improves maternal-fetal prognosis.