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Resumen: ANTECEDENTES: el soporte ventilatorio invasivo es una medida terapéutica de uso común en las unidades de cuidados intensivos; una vez aliviada la enfermedad que ocasionó el apoyo ventilatorio se inicia con el retiro de esta modalidad. Cuando se realiza el retiro puede ocurrir una extubación fallida incluso en 20% de los pacientes, requiriendo reintubación. OBJETIVO: reportar la frecuencia de extubación fallida en la Unidad de Cuidados Intensivos Adultos del Hospital 1° de Octubre del ISSSTE. MATERIAL Y MÉTODO: estudio analítico, observacio4nal y transversal, realizado en la Unidad de Cuidados Intensivos, en el que se analizaron expedientes en el periodo del 1 de marzo de 2014 al 28 de febrero de 2015, con apoyo de ventilación mecánica invasiva por más de 24 horas y que se extubaron después de una prueba de ventilación espontánea exitosa. RESULTADOS: se incluyeron 146 expedientes, 74 (51%) fueron de pacientes del sexo femenino, con promedio de edad de 56 años. Las indicaciones de la ventilación mecánica fueron: estado de choque, n=44 (30%), posquirúrgicos, n=40 (27%). El porcentaje de falla del retiro de la ventilación fue de 18%. El riesgo de prevalencia de extubación fallida fue: midazolam OR 4.8 (IC95% 1.56-14.8, p=0.002), obesidad OR 2.5 (IC95% 1.07-6.16), deterioro neurológico como indicación de ventilación OR 6 (IC95% 3.14-11.8), acidosis metabólica OR 5.2 (IC95% 1.2-22.6). CONCLUSIONES: la prevalencia de extubación fallida en nuestra unidad de cuidados intensivos es de 18%, similar a lo reportado en la bibliografía.
Abstract: BACKGROUND: Invasive ventilatory support is a therapeutic measure commonly used in the Intensive Care Units, cured the disease that caused the ventilatory support begins with withdrawal of this modality. Once the withdrawal is performed, a failed extubation can occur in up to 20% of patients, requiring reintubation. OBJECTIVE: To report the frequency of failed extubation in the Adult Intensive Care Unit from the Hospital 1° de Octubre, ISSSTE, Mexico. MATERIAL AND METHOD: An analytical, observational and transversal study was made in the intensive care unit; files were analyzed in the period from March 1st, 2014 to February 28, 2015, with support of mechanical ventilation for more than 24 hours and extubated after a successful spontaneous breath trail. RESULTS: One hundred forty-six records were identified, 74 (51%) were female, with a mean age of 56 years. The indications for mechanical ventilation were: shock state 44 (30%), postoperative 40 (27%). The percentage of ventilation withdrawal failure was 18%. The risk of prevalence for failed extubation: for midazolam OR 4.8 (95% CI 1.56-14.8, p=0.002), obesity OR 2.5 (95% CI 1.07-6.16), neurological deterioration as an indication of ventilation OR 6 (95% CI 3.14-11.8), metabolic acidosis OR 5.2 (95% CI 1.2-22.6). CONCLUSIONS: The prevalence of failed extubation in our intensive care unit is 18%, similar to that reported in the literature.
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Objective To investigate the influencing factors of successfully switching to sequential ventilation in patients with prolonged weaning due to acute respiratory failure (ARF) after thoracolaparotomy based on the initial rapid shallow breathing index (RSBI) at 60 min after spontaneous breathing trial (SBT), namely, the f/VT optimal value range of 80-120 times/ (min · L), thus providing the basis for determining the ideal timing of weaning in clinical practice.Methods A prospective observational study of sequential ventilation [RSBI during the initial SBT (60 min), 80-120 breaths/ (min · L)] was carried out in 42 patients on mechanical ventilation (≥ 48 h) due to post-thoracolaparotomy ARF in the ICUs.According to the duration of the mechanical ventilation, the patients were divided into 2 groups : successfully prolonged weaning group (≥ 7 days, n =24) and refractory weaning group (＜ 7 days, n =18).The patients with cardiac failure, aged less 18 or over 80, with hepatic dysfunction, or those needing gastrointestinal decompression after esophageal surgery or upper abdomen surgery were excluded.The demographics, APACHE Ⅱ scores and duration of mechanical ventilation of both groups were recorded, and the respiratory work and oxygen metabolism variables before the switch to sequential ventilation (within 24 hours after admission to ICU) and at the time of switching (24 hours in the ICU after admission) were recorded, respectively: clinical puhnonary infection score (CPIS), assessment of cough severity, pH, PaO2, PaCO2 and PaO2/FiO2;hemodynamic and microcirculation-related variables: HR, MAP, fluid balance, BNP and Lac;endocrine and metabolism variables : Hb, ALB and random serum cortisol (COR).The clinical features and the changes of the above-mentioned variables before and at the time of switching were compared between both groups.The independent sample t test was used for the single factor comparison and Mann-Whitney U test was applied to the non-normal distributions.The Fisher exact probability test was used for the single factor comparison of ranked data such as categorical variables.Results There were no significant differences in age, gender and severity of disease between two groups (P ＞ 0.05);the successfully prolonged weaning group had longer duration of invasive mechanical ventilation and ICU stay compared with the refractory weaning group (P ＜ 0.05).There were significant differences in cough severity, PaCO2, pH, HR and fluid balance between two groups before switching (P ＜ 0.05).Compared with those before switching, in the refractory weaning group there were marked decrease in Lac (P ＜ 0.05), obvious increase in cough severity, pH, Hb and ALB (P ＜ 0.05), but there was no significant difference in COR (P ＞ 0.05);while in the successfully delayed weaning group, there were significant decrease in CPIS, PaCO2, HR, MAP, BNP, fluid balance and Lac (P ＜ 0.05), and cough severity, pH, ALB and COR showed an upward trend (P ＜ 0.05).Conclusions The key of successful sequential ventilation is within the values of RSBI ranging from 80 to 120 times/ (min · L) during the initial SBT (60 min) selected as the switching point in patients with prolonged weaning after thoracolaparotomy.The major influencing factors for determining the ideal timing of switching include the matching status between respiratory endurance and respiratory work, the balance between myocardial strength and both cardiac preload and afterload, the severe disease associated with adrenal insufficiency, and malnutrition.
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Introducción: la aplicación de protocolos de separación de la ventilación mecánica parece ser ventajosa aunque los resultados reportados son contradictorios. Objetivo: introducir y evaluar la eficacia de un protocolo de destete dirigido por enfermeros intensivistas para disminuir la letalidad y la duración de la ventilación mecánica. Métodos: se realizó un estudio cuasi experimental (modalidad antes y después) en la Unidad de Cuidados Intensivos del Hospital Lenin de Holguín entre noviembre de 2009 y abril de 2010. Se evaluaron 135 pacientes consecutivos que recibieron ventilación mecánica invasiva >24 h; se excluyeron aquellos con lesiones medulares por encima de C4 y los enfermos terminales. Los pacientes estables clínica y gasométricamente fueron incluidos en el protocolo de separación de la ventilación mecánica. Una hora después de iniciarse el ensayo de ventilación espontánea, se aplicó el índice de respiraciones rápidas superficiales (IRRS) y se consideró exitoso el destete después de 24 h respirando espontáneamente. Las variables discretas se compararon con la prueba de Chi cuadrado y las continuas con t-Student para α=0,05. Resultados: de 135 pacientes evaluados, 66 fueron incluidos. El 65,2 % eran hombres, la edad media fue de 59,4±16,9 años y tenían menor APACHE II (19,9±8,0 vs. 25,4±7,1, p<0,001) que los que no se incluyeron. La primera causa de ventilación mecánica fue el coma. La separación fue exitosa en el 81,8 % aplicando el protocolo (p<0,001). El IRRS no mostró diferencias entre los que fueron separados exitosamente y el resto. Durante la implementación del protocolo se redujo la duración de la VM (6,8±5,9 vs. 5,4±4,5 días, p=0,035) y la letalidad disminuyó aunque sin diferencias significativas (66,9 % vs. 57,8 %, p=0,18). Conclusiones: la introducción del protocolo permitió disminuir la duración de la VM pero no la letalidad en ventilados.
Introduction: the implementation of protocols for weaning from mechanical ventilation (MV) seems to be advantageous although results are contradictories. Objective: to introduce and evaluate a weaning from MV protocol directed by for intensive care nurses to decrease lethality and MV duration. Methods: a quasi-experimental research with the patients admitted at Intensive Care Unit from V. I. Lenin General University Hospital between November 2009 and April 2010 was performed. One hundred and five consecutive invasive ventilated patients for more than 24 hours were evaluated. Patients with medullary lesion above C4 and those in terminal stage were excluded. A protocol based on rapid-shallow-breathing index measured one hour after the patient had been removed from MV was evaluated. Categorical variables were compared with Chi squared test and continuous variables with t-Student. Results: of 135 evaluated patients, 66 were included. 65.2 % were males with a mean age of 59.4±16.9 years and lower APACHE II (19.9±8.0 vs. 25.4±7.1, p<0.001). The first cause of MV was coma. Successful weaning using the protocol was observed in 81.1 % (p=<0.001). Rapid-shallow-breathing index did not show significant differences between the successful weaned patients and the rest ones. Although the duration of MV was lower (6.8±5.9 vs. 5.4±4.5 days, p=0.035) during the protocol implementation period compared with the six previous months, lethality showed no significant differences (66.9% vs. 57.8 %, p=0.18). Conclusions: the introduction of this protocol allowed to diminish the duration of MV but did not improve lethality between ventilated patients.
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OBJETIVOS: Comparar e analisar a correlação entre o índice de respiração rápida e superficial (IRRS) determinado com os valores fornecidos pelo software do ventilador mecânico Raphael® e pelo ventilômetro digital. MÉTODOS: Participaram do estudo 22 indivíduos adultos (17 homens e 5 mulheres), intubados, no pós-operatório de cirurgia cardíaca. Antes da coleta de dados, cada indivíduo foi avaliado, recebeu atendimento fisioterapêutico a fim de promover higiene brônquica e reexpansão pulmonar e foi posicionado em decúbito dorsal elevado em 45º, e depois foram registrados os valores de volume minuto (VM) e frequência respiratória (FR) obtidos pelo ventilador e pelo ventilômetro. O IRRS foi calculado pela relação FR/volume corrente (VC). Aplicou-se o teste t-pareado para comparação das variáveis relacionadas. Utilizou-se o coeficiente de correlação intraclasse (CCI) para mensuração da replicabilidade dos escores. RESULTADOS: Observou-se diferença significativa entre o IRRS obtido pelo ventilador mecânico e o obtido pelo ventilômetro (p-valor=0,011) e concordância moderada para VM (CCI=0,74), alta concordância para FR (CCI=0,80), VC (CCI=0,79) e IRRS (CCI=0,86). Para todas as variáveis, o p-valor foi menor que 0,05. CONCLUSÕES: Houve concordância estatisticamente significativa entre o IRRS calculado pelos valores registrados no ventilador mecânico e pela ventilometria Artigo registrado no Australian New Zealand Clinical Trials Registry (ANZCTR) sob o número ACTRN12610000756022.
OBJECTIVES: To compare and to analyze whether the values of rapid shallow breathing index (RSBI) determined by a ventilator display and a digital ventilometer were correlated. METHODS: Twenty-two adult patients (17 males and 5 females) in the postoperative period of cardiac surgery and in mechanical ventilation were studied. Prior to the data collection, each patient was evaluated, received physical therapy, in order to promote bronchial hygiene and pulmonary reexpansion, and was positioned in elevated dorsal recumbent at 45º. After these procedures, minute ventilation (MV) and respiratory rate (RR) obtained from mechanical ventilator display and digital ventilometer were recorded. The RSBI was calculated by the ratio of RR and tidal volume (VT). Paired t-test was used to compare related variables. The intra-class correlation coefficients (ICCs) were used to measure the reproducibility of the scores. RESULTS: A significant difference was found between the RSBI obtained from the ventilator and by the digital ventilometer (p=0.011). A high agreement for the RSBI (ICC=0.86), for the RR (ICC=0.80) for the VT (ICC=0.79) and a moderate agreement for the MV (ICC=0.74) were observed. The p-value was <0.05 for all variables. CONCLUSIONS: There were a significant agreement between the RSBI obtained from the ventilator display and the digital ventilometer. Article registered on the Australian New Zealand Clinical Trials Registry (ANZCTR) under the number ACTRN12610000756022.
Subject(s)
Adult , Female , Humans , Male , Cardiac Surgical Procedures , Postoperative Care , Pulmonary Ventilation , Respiratory Function Tests/methods , Postoperative Period , Prospective Studies , RespirationABSTRACT
JUSTIFICATIVA E OBJETIVOS: Esta pesquisa justifica-se na necessidade de maior conhecimento a respeito das técnicas de desmame ventilatório utilizadas em pacientes sob ventilação mecânica prolongada. O objetivo deste estudo foi comparar a obtenção do índice de respiração rápida e superficial (IRRS) nas modalidades PSV de 10 cmH2O e PEEP de 5 cmH2O (PSV10); CPAP de 5 cmH2O (CPAP5) e em ventilação espontânea (ESP), correlacionando com sucesso ou insucesso na retirada da ventilação mecânica (VM). MÉTODO: Estudo prospectivo incluindo 54 pacientes em VM há mais de 48 horas, submetidos ao IRRS em três modos ventilatórios: PSV10, CPAP5 e ESP nos momentos pré e pós-nebulização, utilizando tubo-T. Os pacientes foram retirados da VM quando o IRRS era < 105. RESULTADOS: Não houve diferença estatisticamente significativa entre os valores do IRRS obtidos nos momentos pré e pós-nebulização. Houve diferença estatística significativa dos valores do IRRS entre CPAP5 e PSV10 (p = 0,008) e entre a modalidade ESP e PSV10 (p = 0,01) no momento pré-nebulização e dos valores do IRRS obtidos entre CPAP5 e PSV10 (p = 0,01) no momento pós-nebulização. CONCLUSÕES: Neste estudo pode-se observar que o valor do IRRS foi superestimado quando obtido na modalidade PSV10. Foi constatado também que não houve necessidade de nebulização de 30 minutos antes da extubação traqueal quando o desmame é realizado com a técnica de redução gradativa da PSV. Este estudo sugeriu que o IRRS foi capaz de prever o sucesso do desmame; entretanto, incapaz de determinar o insucesso quando seu valor fosse < 105. Recomenda-se que o IRRS seja analisado em associação com outros parâmetros preditivos de desmame.
BACKGROUND AND OBJECTIVES: To compare the attainment of the rapid shallow breathing index (IRRS) in modalities PSV 10 cmH2O and PEEP 5 cmH2O (PSV10), CPAP 5 cmH2O (CPAP5) and spontaneous breathing (SB), correlating them with success on failure in the withdrawal of mechanical ventilation (MV). METHODS: Prospective study including 54 patients in MV > 48 hours, submitted to the IRRS in three ventilatory modalities: PSV10, CPAP5 and SB at the moments before and after T-tube spontaneous breathing. The patients were removed from MV when IRRS was < 105. RESULTS: There wasn't statistically significant difference between IRRS values at the moments before and after T-tube SB. There was statistically significant difference IRRS value between the modalities CPAP5 and PSV10 (p = 0.008), and between the modalities SB and PSV10 (p = 0.01) at the moment before T-Tube SB and of IRRS value, gotten between CPAP5 and PSV10 (p = 0.01) at the moment after T-tube SB. CONCLUSIONS: From this sample, it can be observed that IRRS values are overestimated when gotten in modality PSV10. It was also evidenced that there is no need of a 30 min T-tube SB before extubation, when the weaning is performed with the technique of gradual reduction of PSV. This study suggested that IRRS is able to predict weaning success; however it is not able to determine failure when it was < 105. It is recommended that IRRS must be analyzed in association with other predictive weaning parameters.
Subject(s)
Humans , Male , Female , Adolescent , Adult , Middle Aged , Ventilator Weaning/methods , Respiration, ArtificialABSTRACT
BACKGROUND: The weaning index is a useful tool for avoiding the detrimental consequences of weaning failure, rapidly identifying patients who are potentially ready for spontaneous breathing, and accelerating the process of liberation from mechanical ventilation. This study examined the use of the weaning index as a weaning and extubation predictor in postoperative patients on mechanical ventilatory support in an intensive care unit (ICU). METHODS: Mechanical ventilation was discontinued in patients through pressure support ventilation (PSV), and a T-piece was applied to 169 patients. The success or failure of the weaning process was evaluated according to the preoperative conditions of the patient and their weaning indices, such as the rapid shallow breathing index (RSBI), vital capacity, inspiratory pressure. The duration of mechanical ventilation and the length of stay in the ICU and the hospital were recorded. RESULTS: Weaning from mechanical ventilatory support and extubation was performed successfully in 94.6% of patients. Sixty minutes after applying the T-piece, the PaO2/FiO2 ratio (P/F ratio) was significantly higher and the RSBI was significantly lower in the weaning success group than in the weaning failure group. The ASA class and the percentage of emergency procedures were significantly lower (p < 0.05) in the weaning success group. CONCLUSIONS: Not only the weaning index as RSBI but also P/F ratio, ASA class and emergency status need to be considered for successful weaning and extubation in postoperative ICU patients on mechanical ventilator support.