Monday, June 3, 2019
Combined Pulmonary Fibrosis and Emphysema (CPFE)
feature pulmonic Fibrosis and Emphysema (CPFE)Ong Wei Jun DanThe Ca engrosss, Consequences and Differences Between Pulmonary Fibrosis or Emphysema AloneAbstractCombined pneumonic fibrosis and emphysema (CPFE) is a complicated disease and untreated disease which consists of two diseases. It is difficult for respiratory therapists or respiratory physicians to differentiate among CPFE versus idiopathic pulmonary fibrosis (IPF)/emphysema alone. There is an increased recognition of the coexistence of emphysema and pulmonary fibrosis in individuals. The association of two diseases results in chronic dyspnea, upper-lobe emphysema and lower lobe fibrosis, and severely diminished diffusion of gas exchange with preserved lung volumes. CPFE is also frequently complicated by pulmonary hypertension, lung disfigurement and even lung cancer. This ca enforces CPFE patients to feel encounter a low quality of life and a low 10-year survival rate. Currently, there argon no known treatments for CPFE patients with the ejection of lung transplantation. Thus, clinical evaluations are needed to differentiate between chronic obstructive pulmonary disease (COPD) and pulmonary fibrosis, and to recognize that CPFE is a unique entity by face at the difference in radiological, pathological and metabolism features in order to find better treatment for CPFE.IntroductionAbout 11 million Americans deplete Chronic Pulmonary Obstructive Disease (COPD) and out of these, most are diagnosed with pulmonary emphysema. The etiology of emphysema found that 80% of cases are caused by buttocks smoking, which causes alveolar consonant tissue layers to break down, creating huge alveoli (called blebs) that lesser surface area and weaker walls than expression alveoli. This causes the low perfusion of oxygen out-of-pocket to decrease in surface area. In addition, near 50,000 new cases of Idiopathic Pulmonary Fibrosis (IPF) are diagnosed each year. IPF is a restrictive respiratory disease, and i t is the most parking lot of the idiopathic lung diseases. IPF causes thickening of the alveolar capillary membrane, which results in minimal gas exchange between the alveolar and the blood capillaries. Both diseases lead to the decreased efficacy of oxygen delivery.CPFE is a combination of both IPF and emphysema. However, it is commonly treated as IPF and ignored or excluded in the diagnosis of emphysema. COPD and pulmonary fibrosis gestate different pathologies, metabolic path manners and radiological characteristics, and were therefore regarded as separate entities for a very long time. However, in recent eld, there is some recognition of the coexistence of pulmonary fibrosis and emphysema in patients. As such, it is very important to know the differences between CPFE versus emphysema or pulmonary fibrosis alone in order to find a treatment or prevent the patients conditions from further deteriorating.In the following years, studies had shown that CPFE patients shake a coinc idental detail of early emphysema and at later age of IPF, especially for smokers with many pack years.1 However, in recent studies there is a correlation between the occurrence of the combination between lower lobe pulmonary fibrosis and upper lobe emphysema. These two diseases choose been observed coexisting in great frequencies which are therefore called have pulmonary fibrosis and emphysema (CPFE) and there is a need to distinguish them as distinct entities. There are some studies taking signal to better understand the pathophysiology of the condition and find the possible causes of CPFE such as genetic chemical elements or any biological metabolism pathways which may encourage its development. CPFE is unremarkably caused by heavy smoking, exercise hypoxemia, upper lobe emphysema and lower lobe pulmonary fibrosis, unexpected lung volume and severe reduction of carbon monoxide transfer.2Whether the combination of both emphysema and pulmonary fibrosis is a unique clinical e ntity still remains unknown. For some of the population in the medical community, it is a coincidental occurrence of two smoking-related diseases on one person, versus the coexistence of the similarities of COPD and lung cancer. However, many different studies fuddle shown and suggested that interstitial lung abnormalities, which are normally caused by IPF, have are inversely related to emphysema in smokers. In fact, based on the federal agency roentgenogram images, most patients who have many pack years with IPF do not have any signs of having emphysema. Similarly, most patients who have emphysema do not have any signs of IPF in their chest X-Ray. Hence, the combination of both pulmonary fibrosis and emphysema may be a count on result of heavy smoking or many pack years which falls the uniqueness in individual susceptibilities.Even though medical professionals draw to use chest X-Rays for any respiratory distress, as it is inexpensive and considered a fast diagnostic tool, it is unable to properly diagnose the CPFE syndrome. An other(a) alternative would be to use High-Resolution Chest Computed Tomography (HRCT), which is the only tool to diagnose the syndrome. The CPFE syndrome consists of heterogeneous syndromes, in which syndromes differ from one individual to another and resulting in no effective definition of the syndrome for CPFE. This makes it difficult to diagnose CPFE with the current pulmonary function test, as CPFE patient results look similar to those of patients diagnosed with pneumonia. From past research and observations, CPFE is frequently complicated with pulmonary hypertension, acute lung injury and the possibility of lung cancer, resulting in very poor prognoses. Treatments for CPFE patients with severe pulmonary hypertension have not been found and have largely proved ineffective in curing the disease apart from a wholesale lung transplant.The identification of patients with CPFE is needed due to the uniqueness and complication of t he diseases history. Since CPFE has not yet attracted the assist of researchers and healthcare practitioners, there have not been many studies focused on finding the differences between pulmonary fibrosis, emphysema and CPFE. Currently, there is no consistent way to differentiate the factors, signs and syndromes when diagnosing CPFE patients from other obstructive respiratory diseases. This has resulted in many medical practitioners failing to immediately recognize CPFE in patients diagnoses.Population distribution of Emphysema, IPF and CPFEThe preponderance of the disease emphysema was reported to be at about 24.5 per 1,000 in America, while the prevalence of IPF varied from 14 to 42.7 cases per 100,000. Therefore, emphysema is a more common disease as compared to IPF. However, there are no studies that account for the prevalence of CPFE. Some of the reported observations show that the proportion of patients with CPFE detected on HRCT scans range from 8% to 51% in IPF patients. O n the other hand, the proportion of pulmonary fibrosis found in patients with emphysema is less than 10% using the HRCT. This variation of proportion of prevalence in CPFE may be due to the different types and complications arising from the diagnosis of emphysema when evaluated by chest X-Ray and HRCT.Patients with CPFE tend to be older men who tend to have many pack years of smoking. Previous studies have shown that there is no significant difference when varying the number of pack years against the occurrence of COPD such as emphysema and CPFE. However, patients with CPFE and those with COPD usually have a long history of smoking as compared to patients with IPF. Many studies have reported that male have higher prevalence then female in having respiratory disease syndrome, and could be due to men tending to have more pack years as compared to females. It may also be due to the genes of men which predispose them to succumbing to COPD or CPFE. Even though both IPF and emphysema have proven to be more common in male smokers than female smokers, it does not necessarily mean that gender plays an important risk factor in the contraction of CPFE. more studies are needed to determine how gender differences affect this syndrome.Pathology pathway of CPFETill now, there are no conclusive findings for pathogenies of CPFE. There are no cod conclusions on the development of CPFE, whether emphysema and or pulmonary fibrosis progress independently or whether there are synergistic qualities between the two. There may be some mechanisms involving cytokines, beta receptors or signaling pathways which have not been discovered. Thus, both pulmonary fibrosis and emphysema may tend to occur in genetic faculty individuals with from exposure to environmental factors such as smoking or occupational hazard and chemicals.Case Study of a CPFE patient (Occupational exposure)A case discipline journal report on a male patient aged 73 years old in 2015 gives one of the more detailed ab ridgment of Microscopic Polyangiitis (MPA), a disease that precedes by CPFE. The patient worked as a metalworker and had 25 pack years. He was admitted to the hospital due to progressive juiceless coughing and he was later diagnosed with CPFE. He eventually died due to complications from CPFE, which resulted in severe pneumococcal pneumonia with acute lung injury. His arterial blood gas result was normal with a fairly abnormal range in his pulmonary function test (PFT). There were clear signs of emphysema and IPF from his CT scan and Chest X-Ray (Kyoko Gocho, 2015). MPA is a systemic necrotizing vasculitis of small vessels associated with numerous types of antibodies in particular myeloperoxidase- antineutrophil cytoplasmic antibody (MPO-ANCA). Oxidation induced by MPO-ANCA may trigger pulmonary fibrosis due to alveolar hemorrhage, resulting in pulmonary capillaritis (an inflammation of pulmonary capillary). This causes pulmonary fibrosis as the alveolar capillary wall thickens (Ka giyama, 2015)Correlation of smoking with CPFE patientsA common etiology factor for CPFE is smoking. Tobacco smoke contains 4000 chemical substances, including Kaolinite or aluminum silicate, an organic industrial material. Studies show that inhalation of this organic industrial substance will result in hyperactive macrophages, which in turn will lead to respiratory bronchiolitis and emphysema (King, 2005). Currently, there are no studies for the association of tobacco smoking resulting in IPF, other factors such as environmental factors in genetically-predisposition individuals may play a key role in resulting IPF. The association between CPFE and lung cancer may reflect the susceptibility linked to long term smoking which causes chronic smoking-induced inflammation. These were done on several other studies on the relationship between emphysemaand IPF.3,4Pathological findings (Diagnostic Imaging)Patients who have acute respiratory distress syndrome such as COPD, pulmonary fibrosis o r even CPFE, will tend to have more difficulty breathing due to the use of accessory muscles and the need to constantly supply supplemental oxygen to meet the oxygen level demanded by the body. For some of the patients, a high full point of oxygen is required (flow rate of more than 60L/min) to meet their inspiratory demand. Patients with CPFE have a confused and undetermined ventilation/ perfusion ratio due to emphysema make low perfusion and IPF having low ventilation. This results in both ventilation of oxygen to the alveoli and perfusion of capillaries to be diminished, leading to dead space and shunt. Emphysema results in the reduction of alveoli-capillary surface membrane by forming a bleb that causes air-trapping, whereas pulmonary fibrosis scars the alveolis tissue, creating a shunt that causes ventilation of the oxygen to the alveoli to be inefficient, resulting in the patients body tissue be unable to fill a sufficient amount of oxygen.Other remarkable syndromes found in COPD patients are chronic cough and sputum production in volume greater than one shot full glass due to inflammation of bronchi and impairment of the mucociliary clearance, presumably due to the effects of smoking. Patients with IPF may show progressive shortness of breath, gaudy expiratory wheezing sounds and if the condition is worse cyanosis may appear on the patient. CPFE from previous clinical studies shows that it is similar to IPF. On close physical examination, by doing chest auscultation, it was found that more than 80% of CPFE patients will emit inspiratory dry crackles sounds due to the underlying pulmonary fibrosis. About 40 to 50% will have digit clubbing and poor capillary refill.As of now, there is no consistent definition for CPFE. However, it is very important to diagnose it early. Diagnostic criteria for CPFE include radiological findings by using either chest X-Ray or HRCT these images will appear as upper-lobe emphysema with fibrosis like blebs, lower-lobe honeycombing with subpleural reticular opacities, thick wall cystic lesions, and sometimes ground glass opacities.2Table 1 Comparison of clinical characteristics difference between CPFE, emphysema and IPF patients group (measures of Framingham variables)CPFEIPFEmphysemap-valueSample size22817Age (in years)Median73.574780.7 figure of speech59-9656-8948-86Number of pack yearsMedian6443750.64Range20-5030-8015-65Table 2 Comparison of clinical characteristics difference between CPFE, emphysema and IPF patients group (Pulmonary Function Test)CPFEIPFEmphysemap-valueVital capacity2.520.722.340.862.850.610.52Vital capcity (%)83.122.168.027.787.012.40.29FEV12.010.191.600.241.570.220.28FEV1/FVC(%)76.83.3181.84.4555.64.06 70%, this results being emphysema to be ignored or overlooked. Physician, healthcare workers and respiratory therapists should be aware of its existence. More autopsies should be recognized such as thick-walled cystic lesion and idiopathic interstitial pneumonia should be rec ognized as both of these can be found in CPFE patients but are seldom found in emphysema/IPF alone patients. A deeper understanding of the pathophysiology is needed for CPFE and the factors that causes the syndrome of CPFE should be explored further with more clinical studies so as to develop effective treatments or therapeutic strategies for CPFE patients.References Hiwatari H., S. S. (1993). Pulmonary emphysema followed by pulmonary fibrosis of undetermined cause. Respiration, 60(6).Cottin V., H. N. (2005). Combined pulmonary fibrosis and emphysema a distinct underrecognised entity. European Respiratory Journal, 26(4).Kaplan R. M. (2015). Quality of Well-being Outcomes in the study Emphysema Treatment Trial. Chest Journal, 147(2).Kagiyama C., N. T. (2015). Antineutrophil cytoplasmic antibody-positive conversion and microscopic polyangiitis development in patients with idiopathic pulmonary fibrosis. BMJ Open Respiratory Research, 2(1).Inomata M., A. M. (2013). An autopsy study of combined pulmonary fibrosis and emphysema correlations among clinical, radiological, and pathological features. BMC Pulmonary Medicine, 104(14).King, C. G. (2005). COPD a dust-induced disease? Chest Journal, 128(4).Kyoko G. (2015). Microscopic polyangiitis preceded by combined pulmonary fibrosis and emphysema. Respiratory Medicine Case Reports, 10(2).Papaioannou A. I., E. A. (2016). Combined pulmonary fibrosis and emphysema The many aspects of a cohabitation contract. Respiratory Medicine, 117(10).9. Portill K., J. M. (2011). Combined Pulmonary Fibrosis and Emphysema Syndrome A New Phenotype within the Spectrum of Smoking-Related Interstitial Lung Disease. Pulmonary Medicine , 2012(1).