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*Corresponding Author: Rashmi R Bhuyan, Harbor-UCLA Medical Center
Citation: Rashmi R Bhuyan, Vadera K, (2020). Vaping Induced Pathological Changes in the Lung-A Case Report Study. Cancer Research and Cellular Therapeutics, 4(1): Doi: 10.31579/2640-1053/103
Copyright: © 2020. Rashmi R Bhuyan. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Received: 07 July 2020 | Accepted: 20 July 2020 | Published: 07 August 2020
Keywords: Vaping associated pulmonary injury (VAPI); body ache; fever; nausea; diarrhea
Vaping associated pulmonary injury (VAPI), a group of respiratory symptoms, sometimes accompanied by non-specific symptoms like generalized fatigue, body ache, fever, nausea, diarrhea, vomiting and chills that has been previously categorized as a diagnosis of exclusion and best described as an exogenous lipoid pneumonia, or chemical pneumonitis. Here we describe the onset of an exogenous cause of lipoid pneumonia in an otherwise healthy patient using cannabis-containing products. We explore, similarities in the clinical case, identify common clinical features, characteristic radiologic findings along with cytological changes in the lungs.
The outbreak of severe and acute pulmonary disease associated with the use of cannabis extract-containing vape pens and nicotine e-cigarettes has grown to 2,711 reported cases according to the most up-to-date data retrieved from the Center for Disease Control and Prevention (CDC) website posted on January 20, 2020 [1]. 27 confirmed death cases have been reported due to severe and acute pulmonary disease associated with e-cigarettes in all 50 states, the District of Columbia, and two U.S. territories (Puerto Rico and the U.S. Virgin Islands) [1].
Although chemical exposure has been postulated as a definitive cause, the acute incidence of pulmonary disease has brought national attention to this epidemic (2) and warrants more studies of clinical course, radiological findings and unique pathological changes in the lungs that will help in immediate medical management for VAPI with appropriate support, as reported in the case below.
A 30 year old female with history of anxiety, depression and marijuana use presented in the ED with dyspnea and hypoxic respiratory failure with presumed etiology of inhalation of injury vs hypersensitivity pneumonia. CT chest showed diffuse bilateral ground-glass changes with differential diagnosis of multifocal pneumonia vs interstitial pneumonia (Fig. 2). Due to sustained hypoxia, bronchoscopy was performed on day eight day of admission in the pulmonary intensive care unit. Patient responded well to steroids with infectious work up negative. She was discharged on a short course of Bactrim and oral prednisone 40 mg. Prednisone was tapered and discontinued eventually, with cessation of vaping and smoking, patient made complete recovery in few weeks at home.
On arrival in the emergency department, the patient was tachypneic with a respiratory rate of 46 breaths per minutes and oxygen saturation 70 at ambient air, blood pressure was 127/65 mmHg, heart rate 98 per minute. Started on high flow nasal cannula with improvement of oxygen saturation to high 90s. Subsequently patient was admitted to medical intensive care unit on empirical antibiotic coverage, bronchodilator inhalers and BiPAP for breathing fatigue with an oxygen flow at 40 L/min.
Physical examination is remarkable for diaphoresis, tachypnea, labored breathing with accessory muscle use, diffuse inspiratory and expiratory wheezing in all lung fields bilaterally. Differential diagnosis initially in the emergency department made were interstitial pneumonia vs multifocal pneumonia; VAPI was considered after cytology finding of lipid-laden macrophages in the bronchoalveolar lavage by bronchoscopy procedure was observed. Bronchoscopy showed normal vocal cord, airways without secretions, lesions or obstructions, bronchoalveolar lavage in the right middle lobe and left lower lobe performed with good return of foamy fluid. Patient was then started on oral steroids 60 mgs per day, after that patient was observed to have notable improvement, BiPAP was changed to high flow nasal cannula at 40L/min. Patient showed gradual improvement, was transitioned to room air on day fifteen. Oral steroid was weaned to 40 mg daily for 7 days, then to 30 mg per day for another 7 days, then 20 mg per day for next 7 days, eventually completely discontinued.
CXR:
CT Chest:
Histology Findings:
Lipoid pneumonia is a constellation of lung disease due to presence of lipids in the alveoli and is a chronic foreign body reaction to fat. It can be classified into two groups depending on an exogenous versus endogenous source of lipid or oil and host tissue reactions to the inhaled substances according to their chemical characteristics. The clinical presentation is variable ranging from subtle respiratory symptoms like dyspnea and cough to severe symptoms with life-threatening respiratory failure [3–6]. Therefore, making a diagnosis of exogenous lipoid pneumonia requires a good clinical history and high degree of clinical suspicion. Imaging findings indicating VAPl include interlobular septal thickening, diffuse infiltrates with a range of “ground glass” opacities, and nodular or “tree-in-bud” apical surfaces [7–9]. Cytology examination of sputum or BAL specimen showing the presence of lipid-laden macrophages is also consistent with diagnosis of PAVI; however, high lipid-laden macrophages and high lipid-laden alveolar macrophage index (LLAMI) are not specific findings and can be found in various lung diseases [10], correlation with clinical suspicion and radiologic finding is helpful.
So, the addition of foamy macrophages, extracellular oily droplets, and macrophage with large cytoplasmic vacuoles contrasting to small vacuoles in the endogenous forms is a more specific diagnosis of exogenous lipoid pneumonia [11] which may be associated with inflammatory cells like foreign body reaction with a proliferative fibrosis and macrophages with black pigmentation [12].
The disease outbreak is evolving rapidly. There appears to be some difference of opinion on whether VAPI is best characterized as exogenous lipoid pneumonia or chemical pneumonitis. However, the likely diagnostic path and treatment (trial and failure of albuterol and antibiotics, treatment with steroids, respiratory support and antibiotics to suppress secondary infections) remain the same. This case, with typical symptoms, imaging findings and lipid-laden macrophages on lung cytology, confers the need of early suspicion and appropriate intervention with respiratory support.
Vaping associated pulmonary injury (VAPI) was established.
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