[Pulmonary Hypertension Centers].

Pulmonary hypertension is a group of entities whose most severe form is represented by pulmonary arterial hypertension and chronic thromboembolic pulmonary hypertension. Patient survival is reduced without treatment, so early diagnosis and treatment should be the primary objective. The Instituto Mexicano del Seguro Social participates in this fight to improve the care of these patients, since it has doctors with knowledge in the entity and even a department of Pulmonary Hypertension and Right Heart from where a successful, viable and versatile structure proposal has been made.

[Repeatability of spirometrys expiratory flows].

Background: The quality of the spirometry is estimated with criteria of acceptability and repeatability. The repeatability criteria accepted by consensus is < 0.150 L.

[Treatment of cardiogenic shock due to right ventricular involvement].

The right ventricle is susceptible to changes in preload, afterload, and contractility. The answer is its dilation with dysfunction/acute failure; filling is limited to the left ventricle and cardiac output. Systemic venous congestion is retrograde to the right heart, it is involved in the genesis of cardiogenic shock due to right ventricle involvement.

[Anatomy-physiology considerations for cardiogenic shock with right ventricular involvement].

Since the discovery of right ventricular infarction, interest in the characteristics of the right ventricle has been increasing. Right ventricular function is now known to be a predictor of mortality in different settings. The right ventricle is a low-pressure, high-compliance, high-volume chamber.

[Response to comment on the article "Variability of hemoglobin and hematocrit determined in blood gas equipment"].

Hemoglobin and hematocrit are parameters widely used. They can be obtained from an automated hematology analyzer or from an arterial blood gas analyzer. Its variability is shown in the article "Variability of hemoglobin and hematocrit determined in blood gas equipment.

[Six minute walk test in young native high altitude residents].

Background: The 6-minute walk test is widely used and evaluates the functional capacity to perform sub-maximal exercise, its behavior in healthy young native hight-altitude resident is unknown.

Objective: To describe the behavior of the 6-minute walk test in healthy young native hight-altitude resident.

Material And Methods: Analytical cross-sectional design.

[Six minute walk test: From normal to morbid obesity subject].

Introduction: Morbid obesity is associated with alterations in the ability to walk, however, the behavior of the 6-minute walk test in subjects with increases in body mass index is unknown.

Objective: To describe the behavior of the 6-minute walk test in subjects with normal body mass index to morbid obesity.

Methods: Through an analytical cross-sectional design, subjects of both genders from 18 to 60 years old with body mass index were studied: Normal (BMI:18.

["Follow up" strategy in the management of hospital stay].

Background: In countries with emerging economies, the adequate and efficient management of resources is a priority, through strategies to reduce prolonged stay, increase the availability of beds, maximize profitability and reduce iatrogenic complications.

Objective: The purpose of the study was to evaluate the effect of the "Follow up" strategy (FU) on the main indicators of the hospitalization process.

Material And Methods: A cross-sectional, comparative study was developed to evaluate the impact of the FU strategy on the indicators: hospital admissions and discharges, average days of hospital stay (DEH), percentage of hospital occupancy (OH), bed substitution interval (ISC), bed turnover rate (CRI) and prolonged hospital stay (EHP).

[Variability of hemoglobin and hematocrit determined in blood gas equipment].

Background: Usually hemoglobin and hematocrit are obtained from peripheral venous blood samples processed in equipment for hematic biometry. These parameters can also be determined from arterial samples processed on blood gas equipment. Its variability when using arterial samples and this equipment is unknown, in addition, if the lack of knowledge of this variability affects clinical decisions.

[Pulmonary hypertension. Defining the structure and the departmental function based on risk].

A departmental model for the comprehensive care of patients with pulmonary hypertension is presented. The current knowledge of pulmonary hypertension, its mortality, prognosis and the stratification of its severity that justify the proposal of the departmental structure and function are summarized.

[Within-subject variability of the 6-minute walk test].

Background: The 6-minute walk test assesses the ability to perform exercise and it is widely used, of low cost, and of diverse variability.

Objective: To define the usefulness of a second 6-minute walk test performed 30 minutes from the first. Material and methods.

[Characterization of gas exchange parameters in Mexico City].

Background: At high altitude the gas exchange is impaired, in the moderate altitude of Mexico City they are not yet defined.

Objective: To characterize the gas exchange in the moderate altitude of Mexico City.

Material And Methods: Through an analytical cross-sectional study, subjects born and inhabitants of Mexico City, both genders, aged 20 to 59 years without cardiopulmonary disease, were studied.

Critical care ultrasonography during COVID-19 pandemic: The ORACLE protocol.

Background: Coronavirus disease 2019 (COVID-19) is characterized by severe lung involvement and hemodynamic alterations. Critical care ultrasonography is vital because it provides real time information for diagnosis and treatment. Suggested protocols for image acquisition and measurements have not yet been evaluated.

[Pulmonary arterial hypertension from the risk assessment to combined treatment].

This paper shows the importance of the guideline clinical practice as well as the centers for comprehensive care of pulmonary arterial hypertension. The current treatment of pulmonary arterial hypertension is analyzed according to its severity, stratified through the evaluation of the multiple parameters of risk and its mortality to 1 year. The prognosis of the disease is considered and the place of the combined treatment indicated in sequential manner or from the beginning.

Pulmonary Hypertension in Patients Starting Peritoneal Dialysis.

Background: Cardiovascular complications are the major cause of morbidity and mortality in patients with chronic kidney disease (CKD). One such complication is pulmonary hypertension (PH). Its prevalence in patients in peritoneal dialysis (PD) varies from 12.

Differences in partial oxygen saturation obtained from three pulse oximeters.

IntroducciÓn: Se estima que existe variabilidad en la medición de la saturación parcial de oxígeno entre distintos oxímetros de pulso.

Objetivo: Conocer la variabilidad de la medición de acuerdo con el oxímetro de pulso utilizado en la práctica clínica.

Material Y MÉtodos: Diseño transversal, sujetos consecutivos.

[Pulmonary endarterectomy. Initial report in a cardiology hospital].

Background: Currently the options for treatment of chronic thromboembolic pulmonary hypertension can be pulmonary endarterectomy, pulmonary angioplasty and pharmacological treatment.

Objective: To show the feasibility of performing pulmonary endarterectomy in a cardiology hospital.

Methods: From December 2013 to June 2014 a serie of consecutive cases was studied according to the guidelines of the Fifth World Symposium of Pulmonary Hypertension.

[Variability of arterial and peripheral venous blood gases parameters in subjects with stable obstructive pulmonary disease].

Background: Peripheral venous blood gases may be useful in subjects with exacerbation of chronic obstructive pulmonary disease to evaluate their gas exchange.

Objective: To describe the variability of parameters of arterial and peripheral venous blood gases in subjects with stable obstructive pulmonary disease.

Methods: Cross-sectional design, consecutive subjects were studied in a blinded manner, while arterial and peripheral venous blood was obtained for analysis.

[Obesity hypoventilation syndrome and pulmonary hypertension. An association little-known in Mexico].

The obesity hypoventilation syndrome (OHS) refers to the combination of obesity, daytime hypercapnia and sleep-disordered breathing. Obesity has risen to epidemic proportions in the last three decades in the United States, Mexico and Europe. The OHS is associated with obstructive sleep apnea syndrome in 30%.

[The pulmonary hypertension of the chronic kidney disease].

Pulmonary hypertension in chronic kidney disease is included in the group 5 of the pulmonary hypertension classification of the World Health Organization. Its mechanism is multifactorial and little known. Its importance has increased due to its impact on survival according to whether they received a kidney transplant, the greater risk of early renal graft loss and major hospital stays.

[Pulmonary thromboembolism: Recent experience of 4 years at a cardiology hospital].

It comprised a series of cases over a period of 4 years, held at the Hospital of Cardiology of the Centro Médico Nacional Siglo XXI, IMSS. From 2008 to 2011, admitted to Emergency 184 patients with suspected pulmonary embolism, of which 41 were removed; of the 143 remaining cases, only 127 patients was diagnosed with PE. The other 16 patients had other diagnoses.