Métodos no invasivos de oxigenación en pacientes con COVID-19 / Non-invasive oxygenation methods in patients with COVID-19

Resumen: Desde el inicio de la pandemia por COVID-19, dentro de las complicaciones más frecuentes de esta infección se encuentran la neumonía y el síndrome de dificultad respiratoria aguda. La hipoxemia y el aumento del trabajo respiratorio son determinantes para adoptar diversas estrategias terapéuticas de oxigenación no invasiva en pacientes con COVID-19. Es importante conocer y describir las diferentes modalidades de oxigenoterapia no invasiva, con la finalidad de preservar la oxigenación y un adecuado trabajo respiratorio, las estrategias descritas en la literatura abarcan: cánulas nasales convencionales, cánulas nasales de alto flujo y ventilación mecánica no invasiva, aunado a otras medidas de soporte como posición prono, administración de esquemas con esteroide, inmunomoduladores y óxido nítrico inhalado. Las estrategias no invasivas de oxigenación por diferentes métodos son herramientas indispensables para el tratamiento de pacientes con neumonía por COVID-19 moderada-grave. Es necesario evaluar el dispositivo a emplear, ya que esta enfermedad tiene características heterogéneas de acuerdo con gravedad y el tiempo de evolución.

Abstract: Since the start of the COVID-19 pandemic, the most frequent complications of this infection include pneumonia and Acute Respiratory Distress Syndrome. Hypoxemia and increased work of breathing are determining factors in adopting various non-invasive oxygenation therapeutic strategies in patients with COVID-19. It is important to know and describe the different modalities of non-invasive oxygen therapy, in order to preserve oxygenation and adequate respiratory work, the strategies described in the literature include: conventional nasal cannulas, high-flow nasal cannulas and non-invasive mechanical ventilation coupled with other support measures such as prone position, administration of schemes with steroids, immunomodulators and inhaled nitric oxide. Non-invasive oxygenation strategies by different methods are essential tools for the treatment of patients with moderate-severe COVID-19 pneumonia. It is necessary to evaluate the device to be used, since this disease has heterogeneous characteristics according to severity and time of evolution.

Uso de cánula nasal de alto flujo artesanal como oxigenoterapia en insuficiencia respiratoria por COVID-19 / Use of artisanal high flow nasal cannula as oxygen therapy in respiratory failure due to COVID-19

Los riesgos asociados a la neumonía por (SARS-CoV-2) es la generación de insuficiencia respiratoria secundaria que en algunos casos desencadenara al tan temido síndrome de distres respiratorio (SDRA); Informes sobre atención clínica, indican que tiene una incidencia (SDRA) de 3-10 % con necesidad de Asistencia Respiratoria Mecánica (ARM) en pacientes hospitalizados; por lo que dispositivos de oxigenación no invasivos siguen siendo una opción atractiva, de forma inicial. Caso clínico: mujer de 47 años con insuficiencia respiratoria secundario a neumonía por COVID-19, por la gravedad se indica su ingreso a terapia intensiva, pero por razones de falta de unidad es manejada en unidad respiratoria, con el uso de dispositivos de oxigenación de armado ARTESAL, de manera exitosa, con la utilización de CNAF-artesanal, se pretende mejorar el trabajo respiratorio, índices de oxigenación, mientras se da tratamiento a la infección por el COVID-19; el objetivo del presente caso es reportar el presente caso con evolución favorable a la literatura disponible. Discusión: El uso de terapia de oxigenación con dispositivo de Cánula Nasal de Alto Flujo, aún no ha sido normatizado en pacientes con COVID-19, pero existe evidencia clínica sobre los efectos beneficiosos en la insuficiencia respiratoria en neonatos mas no en adultos. Conclusión: El uso temprano de la CNAF-artesanal en la insuficiencia respiratoria resulta muy atractivo, más aún con dispositivo de confección artesanal, da una opción más al paciente fuera de UTI, pudiendo apoyar en evitar la intubación y su ingreso a ventilación mecánica.

The risks associated with pneumonia (SARS-CoV-2) is the generation of secondary respiratory failure that in some cases will trigger the much feared respiratory distress syndrome (ARDS); Reports on clinical care indicate that it has an incidence (ARDS) of 3-10% with the need for Mechanical Respiratory Assistance (ARM) in hospitalized patients; so non-invasive oxygenation devices remain an attractive option, initially. Clinical case: a 47-year-old woman with respiratory failure secondary to covid-19 pneumonia. Due to the severity, her admission to intensive care is indicated, but for reasons of lack of unity, she is managed in a common room, with the use of high-pressure oxygenation devices. ARTISAL assembly, successfully, with the use of CNAF-artisanal, is intended to improve the work of breathing, and oxygenation indices, while treating the infection by COVID-19; The objective of this case is to report the present case with a favorable evolution based on the available literature. Discussion: The use of oxygenation therapy with a High Flow Nasal Cannula device has not yet been standardized in patients with COVID-19, but there is clinical evidence on the beneficial effects in respiratory failure in neonates but not in adults. Conclusion: The early use of the artisan HFNC in respiratory failure is very attractive, even more so with an artisanal device, it gives the patient another option outside the ICU, being able to help avoid intubation and admission to mechanical ventilation.

Ventilación no invasiva en el síndrome de distrés respiratorio agudo por la COVID-19

RESUMEN Introducción: El uso de ventilación mecánica no invasiva se ha generalizado en el mundo, con un uso extendido incluso en pacientes con fallo respiratorio hipoxémico. Objetivo: Identificar estado actual del uso de la ventilación no invasiva en el síndrome de distrés respiratorio agudo y analizar su aplicación en pacientes con la COVID-19. Desarrollo: La ventilación mecánica no invasiva podría aparecer como un recurso más para dar soporte respiratorio en pacientes con la COVID-19; la escasa evidencia científica sobre su efectividad en el síndrome de distrés respiratorio agudo y el riesgo de contagio por la dispersión de partículas, genera controversia sobre su uso. Conclusiones: En adultos con la COVID-19 e insuficiencia respiratoria hipoxémica aguda, se debe contraindicar el uso de la ventilación mecánica no invasiva; solo valorar su uso en escenarios muy concretos y justificados.

ABSTRACT Introduction: The use of non-invasive mechanical ventilation has become widespread in the world, with widespread use even in patients with hypoxemic respiratory failure. Objective: To identify what is known about the use of non-invasive ventilation in acute respiratory distress syndrome and to analyze its application in this complication in COVID-19. Development: Non-invasive mechanical ventilation could appear as one more resource to give respiratory support in patients with COVID-19 infection, however, the scant scientific evidence on its effectiveness in acute respiratory distress syndrome and the risk of contagion by the particle scattering, generates controversy over its use. Conclusions: In adults with COVID-19 and acute hypoxemic respiratory failure, the use of non-invasive mechanical ventilation should be contraindicated, only assessing its use in very specific and justified cases.

Evaluation of the effect of nursing intervention on the compliance of non-invasive mechanical ventilation in patients with obstructive sleep apnea hypopnea syndrome / 国际生物医学工程杂志

Objective:To explore the effect of nurse-led management model in adherence of patients with obstructive sleep apnea hypopnea syndrome (OSAHS) who underwent non-invasive mechanical ventilation.Methods:92 patients with severe OSAHS diagnosed by polysomnography(PSG) and treated with non-invasive mechanical ventilation in Tianjin medical university general hospital from September 2019 to August 2020 were enrolled. The patients were divided into intervention group (45 cases) and control group (47 cases) by random number table. Then, basing on routine treatment and subsequent visit, the patients in intervention group received regular telephone follow-up interviews within one week of ventilator purchasing, and the interview was based on a standard telephone follow-up manuscript designed by Duffy and lasted for six months. The patients in control group received routine nursing treatment and regular subsequent visit, and were not followed up by telephone, but were encouraged to have telephone consultation. The Epworth sleepiness scale(ESS) scores of the two groups before and after the intervention and the compliance of non-invasive mechanical ventilation of the two groups after the intervention were compared.Results:After the intervention, the ESS scores of the two groups were lower than those before the intervention ( P<0.001), and the ESS scores of the intervention group were lower than those of the control group ( P<0.001). After the intervention, the compliance of noninvasive mechanical ventilation in the intervention group was better than that in the control group ( P<0.001). Conclusions:The nurse-led management model in combination with telephone follow-up can improve the sleepiness of patients and the adherence of using non-invasive mechanical.

Manejo ventilatorio no invasivo de un paciente con enfermedad de Steinert / Non-invasive ventilatory management of a patient with Steinert's disease

Introducción: la enfermedad de Steinert es una enfermedad neuromuscular crónica y progresiva de carácter autosómico dominante. Debido a que puede afectar a los músculos respiratorios, los pacientes se benefician de distintas técnicas de fisioterapia con el fin de evitar complicaciones. Caso clínico: paciente con enfermedad de Steinert que fue tratada en un hospital público de la provincia de Buenos Aires durante un cuadro de insuficiencia respiratoria aguda, de manera no invasiva. Comentarios: esta experiencia muestra que estos pacientes pueden ser tratados de manera no invasiva, fuera de la unidad de cuidados intensivos, y ser controlados ambulatoriamente luego de su egreso pudiendo reinsertarse en la comunidad. Asimismo, cabe destacar que esto fue posible en un hospital público, dentro de un contexto institucional y socioeconómico desfavorable(AU)

Introduction: Steinert's disease is a chronic and progressive autosomal dominant neuromuscular disease. Because this disease can affect respiratory muscles, these patients benefit from different physiotherapy techniques in order to avoid complications. Case presentation: patient with Steinert's disease who was treated in a Public Hospital of the Province of Buenos Aires during an acute respiratory failure with non-invasive way. Comments: This experience shows that these patients can be treated non-invasively, outside the intensive care unit, and be controlled outpatient after discharge, being able to be reinserted in the community. It should also be noted that this was possible in a public hospital, within an unfavorable institutional and socio-economic context(AU)

The observation of curative effect on intermittent positive pressure breathing therapy of non - invasive ventilator in the treatment for COPD of elderly patients with complication of acute respiratory failure / 中国医学装备

Objective: To explore and discuss the clinical curative effect on intermittent positive pressure breathing therapy of non - invasive ventilator in the treatment for chronic obstructive pulmonary disease (COPD) of elderly patients with complication of acute respiratory failure. Methods: 112 elderly patients who were COPD (all of patients were acute exacerbation period) with complication of acute respiratory failure were divided into control group (60 cases) and observation group (52 cases) as the random number table. A series of basic therapy including routine anti-inflammatory, relieving asthma and expectorant therapy were implemented for all of patient. And the non-invasive ventilator was used to implement non-invasive mechanical breathing therapy. In this therapy, patients of control group were implemented sustaining positive pressure breathing therapy, while patients of observation group were implement intermittent non-invasive positive pressure breathing therapy (1:1). The curative effect, pH value (at 6,24 and 72h), PaO2 (at 6,24 and 72h), PaCO2 (at 6,24 and 72h) and complications between the two methods were compared. Results: There was no significant difference in the general demographic characteristics between the two groups. For patients at 6, 24 and 72 h, the differences of the pH value, PaO2and PaCO2 between pre and post-treatment were significant in observation group (F=5.669, F=6.985, F=7.628, P<0.05) and control group (F=5.311, F=6.892, F=7.958, P<0.05) , respectively. The differences of the pH value, PaO2 and PaCO2 at 6h, 24h and 72h were significant (at 24h, F=6.776, F=7.098, F=7.673. at 72 h, F=7.883, F=6.983, F=7.335, P<0.05),respectively. For two groups, the differences of pH value, PaO2 and PaCO2 at pre-weaning, post-weaning 6h and post-weaning 12h were not significant. While the mechanical ventilation time and mechanical ventilation rate of observation group were significant lower than that of control group (t=3.591, x2=3.052, P<0.05). Besides, the incidences of complications including flatulence, trachea intubation, respiratory and relative pneumonia of observation group were significant lower than that of control group (x2=4.997, P<0.05). Conclusion: The new method can significantly shorten duration of breathing and duration of hospital stays. And its incidence of complication is lower while safety of treatment is relatively higher than that of traditional method.

Ventilación mecánica no invasiva en la atención masiva a pacientes con lesiones térmicas / Non invasive mechanical ventilation in the massive care to patients with thermal injuries

Se realizó un estudio descriptivo y transversal de 32 pacientes (mayoritariamente jóvenes del sexo masculino), atendidos en el Servicio Provincial de Caumatología del Hospital General Docente "Dr. Juan Bruno Zayas Alfonso" de Santiago de Cuba, desde agosto hasta septiembre de 2012, como consecuencia de un incendio de grandes magnitudes ocurrido en un servicentro de esta ciudad, con vistas a caracterizarles desde los puntos de vista clínico, epidemiológico y terapéutico. En la casuística predominaron las lesiones por inhalación en las personas con más de 20 % de superficie corporal quemada, a quienes se aplicó ventilación mecánica no invasiva desde las primeras 72 horas y se logró una respuesta positiva. Los 6 afectados que tenían más de 90 % de superficie corporal quemada y uno de los que presentaba entre 60-79 % fallecieron. Se demostró que con la utilización de esta técnica en las primeras 72 horas en los pacientes grandes quemados y con lesiones graves por inhalación se logra disminuir significativamente la mortalidad.

A descriptive and cross sectional study of 32 patients (mostly male young people), assisted in the Provincial Caumatology Service of "Dr. Juan Bruno Zayas Alfonso" Teaching General Hospital in Santiago de Cuba was carried out from August to September, 2012, as a consequence of a huge fire taking place in a servicenter from this city, with the aim of characterizing them from the clinical, epidemiological and therapeutic points of view. Injuries due to inhalation in people with more than 20% of burned body surface to whom non invasive mechanical ventilation was applied since the first 72 hours with a positive response, prevailed in the case material. The 6 affected patients who presented more than 90% of burned body surface and one of those who presented 60-79% died. It was demonstrated that with the use of this technique in the first 72 hours in the largely burned patients, with severe injuries due to inhalation it is possible to decrease mortality significantly.

Length of stay and outcome of hospitalized chronic obstructive pulmonary disease patients, differences between General Medical Ward and Intensive Care Unit: a cohort study / Duración de la estancia y resultado de los lacientes hospitalizados por la enfermedad pulmonar obstructiva crónica, diferencias entre la Sala Médica General y la Unidad de Cuidados Intensivos:: un estudio de cohortes

BACKGROUND: Exacerbations of Chronic Obstructive Pulmonary Disease (ECOPD) are a major problem worldwide and usually a leading cause for hospitalizations and in some cases, indication for invasive mechanical ventilation (IMV). OBJECTIVE: The aim of this study was to determine the length of stay in hospital and outcome of ECOPD patients. We compared the length of hospital stay in the medical ward, intensive care unit (ICU) departments and discharges during a period of six months. METHODS: This was an observational, longitudinal prospective study of 242 COPD patients that were admitted with COPD exacerbation. In each patient, acute physiology and chronic health evaluation (APACHE) II score and serial arterial blood gases (ABG) were measured upon and during admission. RESULTS: Eighty per cent (194) of242 COPD patients were admitted to the medical department and most of them were discharged within five days. Forty-eight needed IMV and stayed in hospital more than ten days; overall mortality rate was about 5%. CONCLUSION: Most of the hospitalized patients with COPD exacerbation (60%) were discharged within five days, 20% needed IMV and stayed in hospital more than ten days.

ANTECEDENTES: Las exacerbaciones de la enfermedad pulmonar obstructiva crónica (EPOC) representan un problema grave en todo el mundo, constituyen generalmente una de las causas principales de las hospitalizaciones, y son en algunos casos la indicación de que se requiere ventilación mecánica invasiva (VMI). OBJETIVO: El objetivo de este estudio fue determinar la duración de la estancia en el hospital y el resultado de los pacientes de EPOC. Comparamos la duración de la estancia hospitalaria en la sala médica, las unidades de cuidados intensivos (UCI), y las altas producidas en un período de seis meses. MÉTODOS: Se trata de un estudio prospectivo, observacional, y longitudinal de 242 pacientes con EPOC que fueron ingresados con exacerbación de la EPOC. A cada paciente se le hicieron mediciones mediante la puntuación de la escala de Evaluación de la fisiología aguda y salud crónica (APACHE II) y la gasometría arterial seriada, tanto al momento de ingresar como durante el ingreso. RESULTADOS: El ochenta por ciento (194) de los pacientes 242 pacientes con EPOC, fueron ingresados en el departamento médico, y la mayoría de ellos fueron dados de alta en cinco días. Cuarenta y ocho necesitaron VMI, y permanecieron en el hospital más de diez días. La tasa de mortalidad general fue alrededor del 5%. CONCLUSIÓN: La mayoría de los pacientes hospitalizados con exacerbación de la EPOC (60%) fueron dados de alta dentro de cinco días. El 20% necesitó VMI, y se permaneció en el hospital más de diez días.

Ventilación no invasiva en cuidado intensivo pediátrico, cuatro años de experiencia / Non invasive mechanical ventilation in pediatric Intensive care four years of clinical practice

Diferentes estudios demostraron la efectividad de la ventilación no invasiva (VNI) para reducir la tasa de intubación en insuficiencia respiratoria aguda y crónica, disminuyendo la orbimortalidadpor la vía aérea artificial y los días de internación en cuidados intensivos.Objetivo. Describir la experiencia en la aplicación de VNI en una unidad de cuidados intensivos pediátricos y analizar las características asociadas al éxito del procedimiento.Diseño. Descriptivo, observacional y retrospectivo. Población y método. Se revisaron las historias clínicas de pacientes que ingresaron a VNI entre 2006 y 2010. Se establecieron 3 grupos, según el contexto clínico de aplicación: VNI electiva (1); VNI de rescate (2); VNI preventiva (3). Para cada grupo se recolectaron edad, gravedad (puntaje PIM 2), días de VNI y evolución. Se consideró fracaso de VNI a la necesidad de intubación (grupo 1) o de reintubación (grupo 2 y 3) en las 72 h posteriores a la aplicación de VNI. Resultados . Ingresaron a VNI 313 niños en quienes se utilizó VNI en 332 ocasiones: 154 correspondieron al grupo electivo, 60 al de rescate y 118al preventivo; la tasa de éxitos fue del 52 por ciento, 63 por ciento y 77 por ciento respectivamente; en el grupo 1 el éxito se asoció a menor gravedad de los niños y en todos los casos los pacientes que fracasaron tuvieron mayor tiempo de internación y peor evolución.Conclusión. La VNI evitó el ingreso a ventilación mecánica invasiva en un alto porcentaje de niños. Su uso preventivo requiere aún estudios para definir las indicaciones de su aplicación.

In the last years, different studies have shown the effectiveness of noninvasive ventilation (NIV) in reducing rate of intubation in chronic and acute respiratory failure, with the direct consequence of lower morbidity and mortality associated with artificial airway, and reduction of days of hospitalization in ICU. Objective. To describe our clinical experience in the use of NIV in the pediatric intensive care unit (PICU) and to analyze the characteristics associated with the success of this technique. Design. Retrospective, descriptive and observational study. Population and methods. We reviewed the medical records of all patients treated with NIV between 2006 and 2010. We divided the patients in three groups, according to the clinical setting of application: elective NIV (group 1), rescue NIV (group 2) and preventive NIV (group 3). For each group we collected age, severity (score PIM 2), day of NIV and evolution. We considered failure of NIV if the patient needed intubation (group1) or reintubation (groups 2 and 3) in the first 72 hours after the application of NIV. Results. During the period of study, 313 children used NIV, some of them in more than one occasion (332 total events): 154 in group 1, 60 in group 2 and 118 in group 3. NIV was applied successfully in 52%, 63% and 77% of the patients in each group, respectively. In group 1, the success of NIV was related with less severity and in all the cases, patients who failed NIV had more days of admission in ICU and worse evolution. Conclusions. There is an increase in the use of NIV and this technique avoided invasive mechanical ventilation in a high rate of children. The preventive use of NIV demands more studies to define the clinical applications in this setting.

Influence of comprehensive nursing intervention on clinical effect of patients with non-invasive mechanical ventilation with BiPAP mode / 中国实用护理杂志

ObjectiveTo investigate the treatment effects of comprehensive nursing intervention on patients with chronic obstructive pulmonary disease(COPD) treated by non-invasive mechanical ventilation with BiPAP mode.Methods96 patients with diagnosed COPD and using non-invasive mechanical ven- tilation with BiPAP mode were randomly divided into the control group(46 cases) which was treated with routine measures and the comprehensive nursing intervention group (50 cases) which adopted comprehen- sive nursing intervention according to experimental design. The frightening degree, incidence rate of com- plications and clinical treatment effect by ventilator were compared between the two groups.ResultsPa- tients compliance with treatment and clinical treatment effect by ventilator in the comprehensive nursing in- tervention group was better than that of the control group. The frightening degree and incidence rate ofcomplications were lower than those of the control group (P < 0.01 ).ConclusionsComprehensive nurs-ing intervention with non-invasive mechanical ventilation with BiPAP mode can improve the treatmentcompliance of COPD patients,reduce complications followed by non-invasive mechanical ventilation andreach the prospective treatment effect.

Ventilação mecânica não-invasiva com pressão positiva / Noninvasive mechanical ventilation with positive pressure

JUSTIFICATIVA E OBJETIVOS: Em 2000, foi publicado o II Consenso Brasileiro de Ventilação Mecânica. Desde então, o conhecimento na área da ventilação mecânica avançou rapidamente, com a publicação de numerosos estudos clínicos que acrescentaram informações importantes para o manejo de pacientes críticos em ventilação artificial. Além disso, a expansão do conceito de Medicina Baseada em Evidências determinou a hierarquização das recomendações clínicas, segundo o rigor metodológico dos estudos que as embasaram. Essa abordagem explícita vem ampliando a compreensão e a aplicação das recomendações clínicas. Por esses motivos, a AMIB - Associação de Medicina Intensiva Brasileira - e a SBPT - Sociedade Brasileira de Pneumologia e Tisiologia - julgaram conveniente a atualização das recomendações descritas no Consenso anterior. Dentre os tópicos selecionados a Ventilação Mecânica Não-Invasiva foi um dos temas propostos. O objetivo deste estudo foi descrever os pontos mais importantes relacionados à ventilação mecânica na forma não-invasiva (VMNI) e sugerir as principais indicações dessa modalidade. MÉTODO: Objetivou-se chegar a um documento suficientemente sintético, que refletisse a melhor evidência disponível na literatura. A revisão bibliográfica baseou-se na busca de estudos através de palavras-chave e em sua gradação conforme níveis de evidência. As palavras-chave utilizadas para a busca foram: Ventilação mecânica não invasiva: Non-invasive mechanical ventilation. RESULTADOS: São apresentadas recomendações quanto à utilização da VMNI nas diversas formas de insuficiência respiratória e no desmame da ventilação mecânica. CONCLUSÕES: A VMNI está indicada como o tratamento preferencial na exacerbação da DPOC, assim como, na assistência de pacientes em edema agudo de pulmão.

BACKGROUND AND OBJECTIVES: The II Brazilian Consensus Conference on Mechanical Ventilation was published in 2000. Knowledge on the field of mechanical ventilation evolved rapidly since then, with the publication of numerous clinical studies with potential impact on the ventilatory management of critically ill patients. Moreover, the evolving concept of evidence - based medicine determined the grading of clinical recommendations according to the methodological value of the studies on which they are based. This explicit approach has broadened the understanding and adoption of clinical recommendations. For these reasons, AMIB - Associação de Medicina Intensiva Brasileira and SBPT - Sociedade Brasileira de Pneumologia e Tisiologia - decided to update the recommendations of the II Brazilian Consensus. Non-Invasive Mechanical ventilation has been one of the updated topics. Describe the most important topics on the non-invasive mechanical ventilation and suggest the main therapeutic approaches of this modality. METHODS: Systematic review of the published literature and gradation of the studies in levels of evidence, using the keywords "non-invasive mechanical ventilation". RESULTS: Recommendations on the non-invasive mechanical ventilation during respiratory failure and weaning are presented. CONCLUSIONS: Non-invasive mechanical ventilation is the main form of ventilatory support during exacerbation of chronic obstructive pulmonary disease and in acute pulmonary edema patients.

New Type Bi-level Positive Airway Pressure(Bi-PAP) in Treating Overlap Syndrome / 中华医院感染学杂志

OBJECTIVE To assess the superiority of new type bi-level positive airway pressure(Bi-PAP) in treating overlap syndrome. METHODS Sixteen cases diagnosed overlap syndrome were quickly given Bi-PAP treatment simultaneously,where their therapeutic efficacy of antibiotic,relieving spasm,diuresis and respiratory stimulant in advance was not fine.All patients were divided into new type Bi-PAP and old Bi-PAP groups based on the type of machines used. RESULTS Seven of 16 patients receiving new type Bi-PAP got remission through non-invasive mechanical ventilation.Among the other 9 patients receiving old type Bi-PAP,6 got remission through non-invasive mechanical ventilation,3 received invasive mechanical ventilation because of poor response to non-invasive mechanical ventilation. CONCLUSIONS More acute overlap syndrome patients can get remission through new type Bi-PAP without invasive mechanical ventilation and have decreased possibility of getting hospital-acquired pneumonia.