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      Anemia and health performance score evaluation as decisive factors for noninvasive mechanical ventilation decisions in AECOPD: are there new key cornerstones?

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          Abstract

          Dear editor Determination of prognosis of exacerbation of chronic obstructive pulmonary disease (AECOPD) is a key cornerstone for health cost, organization, systems, and influences determinations of rationale in the use of non-invasive ventilation (NIV).1 However, systemic complexity of AECOPD makes it difficult to establish a “gold and perfect” prognosis model.1 Recently, a growing number of biological parameters such as anemia and health performance score evaluations are becoming decisive factors for NIV decisions.2 In an interesting study, Haja Mydin et al determined that anemia, and performance status based on World Health Organization performance status (WHO-PS) were independent prognostic markers in acute hypercapnic respiratory failure (AHRF) due to AECOPD.3 The authors considered the major findings were that WHO-PS >3, and anemia, were the best prognostic factors to identify patients unlikely to benefit from NIV. We believe that the study makes a useful contribution to the establishment of predictors of poor prognosis in patients with AECOPD and it may help to make appropriate decisions for rational use of NIV. However, there are some concerns related to this study. Firstly, the mechanism of anemia in chronic obstructive pulmonary disease (COPD) and its impact on survival are still unclear; principally it may be associated with acute systemic inflammation in COPD. Nevertheless, anemia prevalence shows a wide range among studies (7.5%–34%) and many confounding factors associated to comorbidities may exist.4,5 Particularly, the major prevalence of women in this study as sex–factor, could be a conditioning factor. Furthermore, the study did not specify if anemia was associated with hospital readmission.5 Secondly, a high frequency of hospital admissions for AECOPD had no prognostic significance in this study, but it was not clarified if previous episodes needed NIV or endotracheal intubation.6 Previous reports show that the use of NIV during AECOPD may improve long-term outcomes, in comparison with traditional therapy, including endotracheal intubation.5,6 Thirdly, the authors consider that the APACHE II score7 is rarely used outside of the intensive care unit (ICU), in favor of more simple parameters. We do not agree with this interpretation, and believe it deserves some consideration as other studies have demonstrated the usefulness of the APACHE II score7 as a solid independent predictor of hospital mortality on multiple regression analysis studies, and a marker for NIV response and health organization in AECOPD, and at large. To our knowledge there are no studies showing that it is not useful in assessing prognosis. Low performance status is an established prognostic factor for poor outcomes for patients with AECOPD, but this information was well known before the widespread use of NIV in general hospitals.8 Finally, the patient population included in this study may be too low with not enough representation to perform a suitable search for independent prognostic markers of a varied clinical condition such as AECOPD. A previous study9 recruited a larger number of patients with a wider spectrum of severity eg, 1,033 consecutive patients in the multicenter Confalonieri et al study. Moreover, it was noted that the mortality rate was very high (33.8%), in comparison with the majority of randomized clinical trials on NIV in patients with acute hypercapnic failure due to COPD exacerbation, and even more than past studies including ICU patients before the NIV era.5,9 In conclusion, we agree that anemia and a low performance status could have a negative impact on the outcome of patients with AECOPD, but possible patient selection bias and the lack of a control group make the interpretation of the results less firm for Haja Mydin et al,3 with regards to the decision to use or not use NIV for ventilatory treatment.

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          Most cited references 11

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          Early use of non-invasive ventilation for acute exacerbations of chronic obstructive pulmonary disease on general respiratory wards: a multicentre randomised controlled trial.

          Within the intensive-care unit, non-invasive ventilation (NIV) can prevent the need for intubation and the mortality associated with severe episodes of chronic obstructive pulmonary disease (COPD). The aim of this study was to find whether the introduction of NIV, early after the admission on a general respiratory ward, was effective at reducing the need for intubation and the mortality associated with acute exacerbations of COPD. We did a prospective multicentre randomised controlled study comparing NIV with standard therapy in patients with mild to moderate acidosis. NIV was administered on the ward with a simple non-invasive ventilator and a standardised predefined protocol. Patients were recruited from 14 UK hospitals over 22 months. 236 patients were recruited, 118 received standard therapy alone and 118 additional NIV. The two groups had similar characteristics at enrolment. The use of NIV significantly reduced the need for intubation as defined by the failure criteria. 32/118 (27%) of the standard group failed compared with 18/118 (15%) of the NIV group (p=0.02). In-hospital mortality was also reduced by NIV, 24/118 (20%) died in the standard group compared with 12/118 (10%) in the NIV group (p=0.05). In both groups pH, PaCO2, and respiratory rate improved at 4 h (p<0.01). However, NIV led to a more rapid improvement in pH in the first hour (p=0.02) and a greater fall in respiratory rate at 4 h (p=0.035). The duration of breathlessness was also reduced by NIV (p=0.025). The early use of NIV for mildly and moderately acidotic patients with COPD in the general ward setting leads to more rapid improvement of physiological variables, a reduction in the need for invasive mechanical ventilation (with objective criteria), and a reduction in in-hospital mortality.
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            Clinical audit indicators of outcome following admission to hospital with acute exacerbation of chronic obstructive pulmonary disease.

            The 1997 BTS/RCP national audit of acute chronic obstructive pulmonary disease (COPD) in terms of process of care has previously been reported. This paper describes from the same cases the outcomes of death, readmission rates within 3 months of initial admission, and length of stay. Identification of the main pre-admission predictors of outcome may be used to control for confounding factors in population characteristics when comparing performance between units. Data on 74 variables were collected retrospectively using an audit proforma from patients admitted to UK hospitals with acute COPD. Important prognostic variables for the three outcome measures were identified by relative risk and logistic regression was used to place these in order of predictive value. 1400 admissions from 38 acute hospitals were collated. 14% of cases died within 3 months of admission with variation between hospitals of 0-50%. Poor performance status, acidosis, and the presence of leg oedema were the best significant independent predictors of death. Age above 65, poor performance status, and lowest forced expiratory volume in 1 second (FEV(1)) tertile were the best predictors of length of stay (median 8 days). 34% of patients were readmitted (range 5-65%); lowest FEV(1) tertile, previous admission, and readmission with five or more medications were the best predictors for readmission. Important predictors of outcome have been identified and formal recording of these may assist in accounting for confounding patient characteristics when making comparisons between hospitals. There is still wide variation in outcome between hospitals that remains unexplained by these factors. While some of this variance may be explained by incomplete recording of data or patient factors as yet unidentified, it seems likely that deficiencies in the process of care previously identified are responsible for poor outcomes in some units.
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              Acidosis, non-invasive ventilation and mortality in hospitalised COPD exacerbations.

              Reports of non-invasive ventilation (NIV) use in clinical practice reveal higher mortality rates than in corresponding randomised clinical trials. To explore factors related to chronic obstructive pulmonary disease (COPD) admissions and NIV use that may explain some of the previously reported high mortality rates. National UK audit of clinical care of consecutive COPD admissions from March to May 2008. Retrospective case note audit with prospective case ascertainment. Participating units completed a web-based audit proforma of process and outcomes of clinical care. 232 hospital units collected data on 9716 patients, mean age 73, 50% male. 1678 (20%) of those with gases recorded on admission were acidotic and another 6% became acidotic later. 1077 patients received NIV, 55% had a pH<7.26 and 49% (305/618) had or were still receiving high flow oxygen. 30% (136/453) patients with persisting respiratory acidosis did not receive NIV while 11% (15/131) of acidotic admissions had a pure metabolic acidosis and did. Hospital mortality was 25% (270/1077) for patients receiving NIV but 39% (86/219) for those with late onset acidosis and was higher in all acidotic groups receiving NIV than those treated without. Only 4% of patients receiving NIV who died had invasive mechanical ventilation. COPD admissions treated with NIV in usual clinical practice were severely ill, many with mixed metabolic acidosis. Some eligible patients failed to receive NIV, others received it inappropriately. NIV appears to be often used as a ceiling of treatment including patient groups in whom efficacy of NIV is uncertain. The audit raises concerns that challenge the respiratory community to lead appropriate clinical improvements across the acute sector.
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                Author and article information

                Journal
                Int J Chron Obstruct Pulmon Dis
                Int J Chron Obstruct Pulmon Dis
                International Journal of COPD
                International Journal of Chronic Obstructive Pulmonary Disease
                Dove Medical Press
                1176-9106
                1178-2005
                2014
                30 January 2014
                : 9
                : 151-154
                Affiliations
                [1 ]Intensive Care Unit, Hospital Morales Meseguer, Murcia, Spain
                [2 ]Department of Pneumology, University Hospital of Trieste, Trieste, Italy
                [1 ]Department of Respiratory Medicine, Aberdeen Royal Infirmary, Aberdeen, United Kingdom
                [2 ]Department of Respiratory Medicine, Sunderland Royal Infirmary, Kayll Road, Sunderland, United Kingdom
                Author notes
                Correspondence: Anotonio M Esquinas, Intensive Care Unit, Hospital Morales Meseguer, Avenida Marques de Los Velez s/n, Murcia, 30.008, Spain, Email antmesquinas@ 123456gmail.com
                Correspondence: Helmy Haja Mydin, Department of Respiratory Medicine, Aberdeen Royal Infirmary, Aberdeen AB25 1YX, UK, Tel +44 1224 559442, Email helmy.hajamydin@ 123456nhs.net
                Article
                copd-9-151
                10.2147/COPD.S57085
                3912044
                24501539
                © 2014 Esquinas and Confalonieri. This work is published by Dove Medical Press Limited, and licensed under Creative Commons Attribution – Non Commercial (unported, v3.0) License

                The full terms of the License are available at http://creativecommons.org/licenses/by-nc/3.0/. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

                Categories
                Letter

                Respiratory medicine

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