Advanced Chronic Obstructive Pulmonary Disease

Chronic obstructive pulmonary disease (COPD) is a leading cause of morbidity and mortality worldwide and results in an economic and social burden that is both substantial and increasing. By the year 2020, COPD will be the third leading cause of mortality and the fifth leading cause of disability worldwide.[1] In a population based study conducted at multiple international sites, approximately 10% of participants 40 years of age or older were found to have airflow obstruction of at least moderate severity according to spirometric criteria.[2] In China, the overall prevalence of COPD in individuals 40 years of age or older was 8.2%.[3] COPD is a slowly progressive respiratory disease, which, although preventable and treatable, is not curable. The final years for patients with advanced COPD are characterized by progressive functional decline, frequent exacerbations, poor quality of life, increasing dependency on informal caregivers and on the health care system.[4] According to the literature, 5-year survival from diagnosis is estimated to be 78% in men and 72% in women with mild disease, but only 30% in men and 24% in women with advanced COPD.[5] Our current standard clinical management to COPD mainly focuses on the underlying pathophysiology of disease (treating bronchoconstriction, reducing hyperinflation and airway inflammation) within which patients receive episodic care aimed at treating and preventing acute exacerbations. The optimal management of symptoms in patients with advanced COPD or end-stage COPD is an often neglected aspect under this disease management model. While the reality is that for patients who have advanced COPD the symptom burden is substantial, that maximal traditional therapy for advanced COPD produces only modest relief of symptoms, leaving these patients with significantly reduced health-related quality of life.[678] Dyspnea as the predominant symptom is often poorly controlled and ultimately incapacitating. High quality symptom-focused interventional strategies and palliative care services in our current models of care are less accessible than they are for people with cancer.[6910] The present review will focus on the patient population with advanced COPD or end-stage COPD, who have been paid less attention by the physicians and investigators previously, and summarize the literature to find innovative and integrated management approaches for this population. DEFINITION OF ADVANCED CHRONIC OBSTRUCTIVE PULMONARY DISEASE Generally, advanced COPD refers to the later stage of the condition, in which the symptoms are poorly responsive to treatment and continually worsen over time. The US National Hospice and Palliative Care Organization proposed a very specific definition of end-stage pulmonary disease, with the aim of identifying patients with advanced lung disease eligible for hospice care[1112] [Table 1]. But the aims are not COPD specific and arbitrarily define the last 6 months of life as end-stage disease, a rather short period. Klimathianaki et al.[13] and Viegi et al.[14] defined the end-stage COPD based on clinical features, such as very severe airflow limitation, severely limited and declining performance status, advanced age, presence of multiple comorbidities, and severe systemic manifestations/complications of COPD [Table 1]. Based on a combined and comprehensive assessment strategy, the Global Initiative for Chronic Obstructive Lung Disease (GOLD) guideline classified the COPD patients into four groups (A, B, C, and D), with the patients in D group the most severe and advanced state of illness [Table 1].Table 1: Definitions of advanced COPDSYMPTOM BURDEN OF ADVANCED CHRONIC OBSTRUCTIVE PULMONARY DISEASE Dyspnea: The predominant symptom in advanced chronic obstructive pulmonary disease For patients with COPD, dyspnea is the most prevalent and distressing symptom, and its severity and magnitude increases as the disease progresses, leading to significant disability and a negative effect on the quality of life. Refractory dyspnea is a common and difficult symptom to treat in patients with advanced COPD. In a comparison of symptoms experienced by patients with COPD and lung cancer, patients with cancer reported higher levels of pain, but dyspnea was more frequently reported in the patients with COPD,[1516] and dyspnea is also more severe in COPD patients. For those who live with advanced COPD, dyspnea is a significant source of disability and profoundly affects the quality of life to the extent that patients become isolated and describe themselves as existing rather than living.[17] In one study, 41% of patients who died of COPD left the house less than once per month or never in their last year of life. In a multicenter study, relief of symptoms such as dyspnea was a top priority targeted for improvement in the care of patients hospitalized with COPD.[18] However, dyspnea is currently the symptom least well palliated by traditional approaches.[19] The prevention, relief, reduction, and soothing of dyspnea symptoms should be an important integral component of standard care for COPD. Other common symptoms in advanced chronic obstructive pulmonary disease In addition to dyspnea, patients with COPD also suffer from a considerable range of additional symptoms. Anxiety and depression are common in advanced COPD, resulting from the dyspnea, disability, and isolation caused by the disease.[2021] In a cross-sectional study of 109 patients with very severe COPD (median forced expiratory volume in 1 s [FEV1] 34% predicted and most on long-term oxygen therapy [LTOT] for more than 1 year), 57% demonstrated significant depressive symptoms.[22] Studies have documented that generalized anxiety disorder and panic disorder are more prevalent in patients with COPD than in the general population.[23] Anxiety and depression have been associated with the higher rates of both COPD exacerbations and mortality.[242526] Fatigue or weakness is also reported, as a consequence of dyspnea.[27] Other symptoms include pain, insomnia and anorexia, weight loss, cough, constipation, and incontinence.[7919282930] These symptoms are often uncontrolled at the end-stage of the disease. The severity of these other symptoms, in addition to dyspnea, contributed to the deceased's overall quality of life for patients with advanced COPD. Compelling data demonstrated that patients who live with advanced COPD suffer from a lower quality of life than patients with lung cancer.[631] When compared to patients with advanced lung cancer, patients with advanced COPD were found to have significantly worse activities of daily living and worse physical, social, and emotional functioning. Patients with advanced COPD were also more likely to be suffering from clinically relevant depression and anxiety (90%) than the patients with lung cancer (52%).[31] Although COPD patients have such high symptom burden, existing model of care, as mentioned at the beginning, for these patients is reactive and mainly focuses on acute exacerbations. There is evidence that patients with advanced COPD, suffering on average from 7 to 11 symptoms, have high palliative care needs, and concerns about symptom relief, quality of life, satisfaction with care, disease education, and use of care facilities.[28323334] In SUPPORT study, when compared with patients with lung cancer, patients with COPD were much more likely to die in the Intensive Care Unit, on mechanical ventilation, and with dyspnea.[15] These differences occurred despite most patients with COPD preferring treatment focused on comfort rather than on prolonging life. Additional studies have documented the significant burden of symptoms and poor quality of palliative care among patients with advanced COPD.[28] In summary, palliative care which focuses on controlling symptom, relieving suffering and optimizing the quality of life should be better integrated into the current standard clinical management for advanced COPD. MANAGEMENT STRATEGIES OF ADVANCED CHRONIC OBSTRUCTIVE PULMONARY DISEASE Conventional pharmacologic interventions Many patients with advanced COPD obtain symptomatic relief from the use of inhaled bronchodilators. Both short-acting β2-agonists and short-acting anticholinergics are equally effective in improving dyspnea and exertional tolerance in patients with COPD. Long-acting bronchodilators are indicated in patients with advanced COPD. Even though both long-acting β2-agonists (LABA) and long-acting anticholinergics are effective, tiotropium may be superior to LABA, especially in patients with very severe COPD.[3536] Inhaled corticosteroids are also widely prescribed for advanced COPD. Currently, inhaled corticosteroid plus long-acting β2-agonist or long-acting anticholinergic is the recommended first choice for advanced COPD patients worldwide. A combination of all three classes of drugs (inhaled tri-corticosteroid/long-acting β2-agonist/long-acting anticholinergic) improves lung function and quality of life[3738] and may further reduce exacerbations.[39] A phosphodiesterase-4 inhibitor, theophylline, or carbocysteine can be used in addition to a long-acting bronchodilator or if long-acting inhaled bronchodilators are unavailable or unaffordable. While these conventional interventions are helpful, as COPD progresses, the symptoms of advanced COPD become less palliated, especially dyspnea, and other therapies beyond the conventional pharmacological approaches are needed to improve health-related quality of life among these patients. Adjunctive nonpharmacological approaches Pulmonary rehabilitation As airflow obstruction progresses, patients with COPD typically become increasingly sedentary, which leads to muscular and cardiovascular deconditioning. Increasing physical disability contributes to social isolation and depression, which are highly prevalent among patients with advanced COPD. The primary goal of pulmonary rehabilitation is to reduce symptoms, improve the quality of life, and increase physical and emotional participation in daily activities. The components of pulmonary rehabilitation vary widely but a comprehensive program includes exercise training, smoking cessation, nutritional therapy, and self-management education (breathing strategies, use of supplemental oxygen, pharmacologic therapy, and panic control). Pulmonary rehabilitation has been carefully evaluated in a large number of randomized, controlled trials (RCTs), which generally involved patients with advanced disease according to spirometric criteria (FEV1/forced vital capacity <0.70; FEV1, 30–49% of predicted value), and shown to reduce the perceived intensity of dyspnea, reduce anxiety, and depression associated with COPD improve exercise capacity and health-related quality of life, and even improve survival in some studies.[4041] Benefits have been reported from rehabilitation programs conducted in inpatient, outpatient, and home settings. Although patients with advanced stages of COPD usually have limited exercise tolerance, pulmonary rehabilitation has still been shown to be effective in this group.[42] In a multicenter study of more than 1000 COPD patients, pulmonary rehabilitation was also found to be effective among patients with chronic respiratory failure.[43] Oxygen therapy and ventilatory support LTOT is often prescribed in the later stages of the disease to improve survival for those people with COPD, who are significantly hypoxemic. Two RCTs, published almost 30 years previously, established the significant survival benefit of LTOT when used for at least 15 h/d in hypoxemic COPD patients.[4445] Oxygen therapy may also provide a symptomatic benefit by reducing dyspnea when administered at rest to hypoxemic patients with advanced COPD. However, little evidence from controlled studies supports its utility for dyspnea in the absence of hypoxemia. The combination of noninvasive ventilation with LTOT may be of some use in a selected subset of patients, particularly in those with pronounced daytime hypercapnia in improving survival but not the quality of life.[46] SURGICAL OPTIONS Lung volume reduction surgery, bronchoscopic lung volume reduction, lung transplantation, and bullectomy are surgical options for appropriately selected patients with advanced COPD. However, selection of ideal patients is critical for all these surgical treatments. Innovative approaches to advanced chronic obstructive pulmonary disease: The dyspnea ladder and opioids Dyspnea is the most common symptom in end-stage COPD, 98% of patients who died of COPD were breathless all the time or some of the time in their last year of life.[19] If dyspnea persists despite optimal therapy with pharmacologic and nonpharmacologic interventions in patients with end-stage COPD, some innovative approaches should be developed. In this context, some investigator proposed the concept of dyspnea ladder and used opioids to palliated dyspnea and other symptoms of advanced COPD. Actually, it has been almost 20 years since opioids were first reported to be associated with a reduction of dyspnea symptoms in COPD.[47] Opioids have multiple mechanisms of action for symptom relief, including reductions in ventilation, oxygen consumption, sensitivity to hypercapnia, the central perception of dyspnea (similar to the reduction in the central perception of pain), and anxiety associated with dyspnea.[48] An increasing body of evidence supports the use and safety of oral and parenteral opioids for refractory dyspnea in patients with advanced COPD. A systematic review evaluated the use of opioids for dyspnea in 18 double-blind, randomized, placebo-controlled trials, in which 11/18 studies included only COPD patients. The systematic review confirmed overall beneficial effects of both oral and parenteral opioids on dyspnea, a conclusion supported by subsequent reports.[484950] While evidence of nebulized opioids’ efficacy is conflicting, and there is insufficient data to conclude whether nebulized opioids are effective.[48] Several recent evidenced-based clinical guidelines recommend that opioids should be considered on an individualized basis for relieving dyspnea in advanced COPD in addition to adequate treatment of the underlying disease [Table 2].[151525354] Rocker et al. proposed a “Dyspnea Ladder”,[55] following the example of the World Health Organization analgesic ladder in the management of cancer pain, which is later modified and adopted by the Canadian Thoracic Society in a guideline of managing dyspnea in patients with advanced COPD [Figure 1].[54] The clinical practice guideline emphasizes a stepwise approach to palliation of refractory dyspnea using conventional therapies, nonpharmacological approaches, carefully initiated and titrated opioids, and it also provides a detailed pathway for prescribing opioid therapy in patients with advanced COPD [Table 2]. In summary, opioids should be dosed and titrated for the individual patient for relief of dyspnea, with due consideration of patient history, comorbid conditions, and risk for respiratory depression. A dyspnea scale should be used to guide dose adjustment with the dual goals of providing adequate dyspnea relief and minimizing the sedative effects. Common opioids side effects are drowsiness, nausea, vomiting, dizziness, and constipation, but there is no evidence indicating that opioids use is associated with deleterious effects on arterial blood gases or oxygen saturation in patients with COPD.[48] Clinically significant respiratory depression is also uncommon with the doses used to treat dyspnea, even in elderly patients. There are no data to suggest that the use of opioids for the management of breathlessness is associated with a reduction in a patient's life expectancy.[5256]Table 2: Guidelines recommendation of opioids for relief of dyspnea in patients with advanced pulmonary diseaseFigure 1: Comprehensive approach to the management of dyspnea in patients with the advanced chronic obstructive pulmonary disease. ICS: Inhaled corticosteroids; LAAC: Long-acting anticholinergics; LABA: Long-acting β2-agonists; NMES: Neuromuscular electrical stimulation; O2: Oxygen; PDE4: Phosphodiesterase-4; SABD: Short-acting bronchodilators (from reference 66).Despite the evidence supporting their benefit and the recommendation by those clinical guidelines, opioids are infrequently prescribed in clinical practice, especially in China. There is an important need to address barriers of prescribing opioids for clinicians. These barriers are prominent and include insufficient uptake of evidence-based practice guidelines, lack of education regarding opioid prescription, pharmacokinetics, titration, and fears of further respiratory depression and other significant side effects, as well as concerns and attitudes about addiction and dependence. Meanwhile, well designed RCTs are still needed to demonstrate the efficiency and safety of opioids use in Chinese population with advanced COPD, and the optimal initiation dose, dosing interval, titration schedule, and delivery route in this population are also waiting to be addressed. Palliative care, end-of-life care and hospice care for advanced chronic obstructive pulmonary disease The disease trajectory in COPD is usually marked by a gradual decline in health status and increasing symptoms, punctuated by acute exacerbations that are associated with an increased risk of death.[57] Palliative care, end-of-life care, and hospice care are important components in the management of all patients with advanced COPD and have been shown to improve the quality of life, reduce symptoms burden, and even prolong survival for some patients. The 2013 updated GOLD guideline also added this part into the management approaches for COPD patients. Palliative care is a broadest term and includes (but is not limited to) both end-of-life care (care for those who are actively dying), as well as hospice care (a model for delivery of end-of-life care for patients who are terminally ill and predicted to have <6 months to live). The goal of palliative care is to prevent and relieve suffering and to support the best possible quality of life for patients and their families, regardless of the stage of disease or the need for other therapies.[58] Although originally conceived and practiced as end-of-life care, palliative care may be applied to all stages of illness, whether terminal or not. For patients with the most advanced and terminal illness, hospice services, and end-of-life care may provide additional benefit. Hospice care is defined as the support and care for patients and their families in the last phase of an incurable disease so that they may live as fully and comfortably as possible. In the Western developed countries, hospice services may provide these services within the patient's home or in hospice beds in dedicated hospice units or other institutions such as hospitals or nursing homes. Guidelines and/or criteria for selecting patients with noncancer diseases like COPD for access to hospice services are also available,[115159] such as the guideline proposed by the US National Hospice and Palliative Care Organization (mentioned early in this review). According to this guideline, COPD patients with disabling dyspnea at rest that is poorly responsive to bronchodilators and progression of advanced disease demonstrated by increasing hospitalizations or emergency department visits are eligible for hospice services. Although a number of studies show that the system burden in patients with advanced COPD is higher, and the health-related quality of life is poorer than the patients with lung cancer, patients with advanced COPD are less likely to receive such palliative care than patients with lung cancer.[4315960] There are several reasons for this. First, patient-clinician communication about palliative and end-of-life care is infrequent and often of poor quality; many clinicians have discomfort when discuss with their patients about end-of-life care. Secondly, the uncertainty in predicting prognosis for patients with advanced COPD makes a communication about end-of-life care more difficult. Additional barriers preventing advanced COPD patients receiving adequate palliative care include lack of palliative care related knowledge and skills for clinicians, and issues about the medical insurance policy. Recent studies provide insight and guidance into ways to improve communication between clinicians and patients with advanced COPD and their families about end-of-life care and thereby improve the quality of palliative and end-of-life care the patients receive.[616263] The profiles and criteria proposed by these studies to identify patients with COPD who is at high-risk for and benefit from palliative care are also very to improve the current In China, the and palliative care at palliative care, end-of-life care, and hospice care are the reality is to within a short time clinicians who care for patients with COPD, should be in and providing a of recommended in palliative care, and should their patients identify palliative care within their In our are increasingly with the need to care for an population which is significantly with chronic and As the prevalence of COPD more patients and families will live with the of advanced COPD than As patients with advanced COPD approach the of their disease many suffer from dyspnea despite optimal conventional pharmacological and nonpharmacological therapies, which to the in quality of life of advanced COPD patients. innovative and effective approaches are needed to symptom in advanced stages of COPD and opioids have in this approaches to COPD, based on the have been more the underlying pathophysiology of disease and less and palliative care at controlling symptom and relieving The a high quality evidence-based innovative and integrated model of care, including both medical focused on increasing survival and and palliative approaches on optimizing quality of life, to COPD will better patients and their support and of There are no of

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