Clinical and radiological characteristics of e-cigarette or vaping product use associated lung injury

Abstract

Purpose

E-cigarette or vaping product use associated lung injury (EVALI) has received national attention as an epidemic resulting in cases of significant morbidity and mortality. We aim to present the clinical and imaging findings in adolescents with pulmonary symptoms from suspected EVALI.

Methods

Chest radiographs and CTs of adolescents (< 19 years) with acute pulmonary symptoms and history of vaping were reviewed by two radiologists in consensus. Clinical presentation and laboratory data were derived from the electronic medical records including pulmonary function tests (PFTs).

Results

Eleven patients were identified (9 male, mean 16.6 years). The most common presentation was progressive, subacute respiratory distress with abdominal pain. All but one of the patients tested positive for tetrahydrocannabinol. Chest radiograph features were notable for interstitial pattern of opacities (91%) and basilar abnormalities (82%). CT features were notable for ground-glass opacities (89%), interstitial opacities (78%), and subpleural sparing (67%). Eight patients underwent PFTs. Six had diffusing capacity measurement, which demonstrated impaired diffusion in 3 (50%). All patients received supportive treatment with supplemental oxygen and corticosteroids.

Conclusion

Adolescents with suspected EVALI commonly present with subacute respiratory distress with abdominal pain. Imaging findings include ground-glass opacities, subpleural sparing, and basilar opacities, most consistent with organizing pneumonia or hypersensitivity pneumonitis. Recognition of the common imaging findings may have significant patient management implications, especially if the diagnosis is not suspected clinically. The lung function effects of vaping are consistent with mildly reduced airflow, which improves on follow-up testing, and reduced diffusion capacity, which, concerningly, does not improve.

Introduction

Lung injury related to the use of electronic nicotine and marijuana delivery devices recently and markedly spiked over the several months in late 2019. Per the CDC morbidity and mortality publication as of February 2020, there have been over 2800 reported cases of hospitalized e-cigarette or vaping product use associated lung injury (EVALI) in the USA with 86 deaths, an increase from only 215 reported cases with 1 death as recently as August 2019, while reaching a peak incidence in September 2019 [1,2,3]. Fifteen percent of these patients are under 18 years old.

In this most recent CDC report, 82% of patients who had an EVALI had used a tetrahydrocannabinol (THC)-containing product. Approximately 1 in 4 adolescent e-cigarette users admit to vaping with cannabis [4]. There has also been a strong association with vitamin E contamination contributing to the lung injury, detected in bronchial alveolar lavage (BAL) in all 51 of the sampled cases, while other tested oils were present in only two cases [5].

The majority of patients have been reported to present acutely with constitutional symptoms (fever, malaise, fatigue, headache), gastrointestinal symptoms (nausea, vomiting, abdominal pain, weight loss, anorexia), and respiratory symptoms (cough, chest pain, shortness of breath) [1, 6, 7]. Given the presentation being very similar to a viral prodrome, for example influenza or COVID-19 infection, EVALI is a diagnosis of exclusion [1]. The acuity of presentation has been reported to be variable, but the majority tend to present within 7 days of onset of symptoms [8].

Despite availability of electronic nicotine delivery systems (ENDS) in the USA since 2007, initial reports of acute inhalation-related injuries were limited with the first case report described in 2013 [9]. A case of EVALI associated with cannabis oil was first reported in an adult patient in 2017 [10] and described as pulmonary hemorrhage and organizing pneumonia on CT and biopsy evaluations. Since then, EVALI has been documented in the radiologic literature as a variety of case reports and case series with descriptions varying. Imaging appearances on radiographs and CTs have been likened to hypersensitivity pneumonitis (HP) [11], organizing pneumonia (OP) [7, 10, 12, 13], acute alveolar hemorrhage [11, 14], diffuse alveolar damage of ARDS [8, 15, 16], and an early single case of acute eosinophilic pneumonia (AEP) [9]. While lipid laden macrophages have been seen on BAL [17], there have not yet been any reported CT findings of lipoid pneumonia in the literature.

Materials and methods

Patient selection

Our study was approved by our Institutional Review Board and was HIPAA compliant. A single institution retrospective study was performed utilizing the hospital and pulmonology department databases to identify all adolescent patients (< 19 years old) with a history of frequent vaping with clinically suspected EVALI after presenting with respiratory distress between January 2019 and December 2019.

Imaging along with clinical, laboratory, and bronchoscopic data was reviewed along with clinical symptoms at the time of presentation.

Imaging review and analysis

Chest radiographs and chest CTs were reviewed in consensus by two pediatric chest radiologists (DMB—10 years of experience, and JBR—3 years of experience). The first radiograph associated with the current admission was interrogated. Each chest radiograph was evaluated for presence of interstitial or alveolar opacities and/or consolidation. Distribution of disease, symmetry of disease, and presence of pleural effusions or pneumothorax were also assessed.

For evaluation of the chest CTs, a more detailed assessment was performed. Ground-glass opacities; interstitial opacities; tree-in-bud opacities; centrilobular nodules; consolidation; presence of macroscopic focal fat; and/or mosaic attenuation were evaluated. Distribution was determined as bilaterally symmetric/asymmetric, as apical or basilar, and for the presence of subpleural sparing. Evaluation of the airway included assessment of bronchiectasis, airway impaction, or peribronchial thickening. The pleura was also evaluated for effusions or pneumothorax.

Clinical and pathology review

A retrospective chart review was performed by a senior pediatric pulmonology fellow and experienced pediatric pulmonologist (AGC and JA) on all 11 patients who were admitted with EVALI. Information regarding demographics, clinical presentation at admission, hospital course, treatment, pulmonary function testing, bronchoalveolar lavage findings, and vaping product use was collected. Due to the lack of clinical guidelines in the treatment of EVALI at that time, the clinical practice varied between patients. Clinical notes from follow-up appointments were also reviewed if available. The collected data were analyzed using descriptive statistics.

Results

Eleven patients were identified, all of whom presented to the emergency department for evaluation. Although the inclusion criteria was from January 2019 to December 2019, all cases occurred in the late summer and fall, between August 2019 and November 2019 (Table 1).

Table 1 Demographics, clinical characteristics, treatment, and clinical course

All 11 patients underwent chest radiography at time of presentation to the emergency room. Chest radiographs were performed in both the anterior posterior (AP) and lateral in 9 of 11 patients, and only the AP projection in the remainder of the patients. Ten (91%) of these patients underwent a subsequent chest CT within 3 days of presentation (range 0–3, mode: same day, mean < 1 days). Half (5/10) of the CTs were performed at an outside institution with the patient thereafter transferred to our institution for tertiary care, resulting in various techniques utilized. Most chest CTs were performed with intravenous contrast (7/10). Low-dose techniques were utilized in examination performed at our institution. No patient has had follow-up CT examination to date.

Patients ranged in age from 15 to 18 years with a mean of 16.6 years at presentation. Nine of the eleven (82%) patients were male, and 91% (10/11) of the patients were white. A total of 55% (6/11) of the patients had a prior diagnosis of asthma at the time of presentation. Ninety-one percent (10/11) reported that they had vaped THC, 73% (8/11) vaped nicotine, and 64% (7/11) vaped both, at the time of presentation. Forty-five percent of the (5/11) patients had reported that they vaped other products such as cannabidiol (CBD), and two patients smoked combustible cigarettes.

All of the eleven patients had gastrointestinal and constitutional symptoms, and 91% of the (10/11) patients had respiratory symptoms at the time of presentation. Sixty-four percent had leukocytosis and 73% (8/11) had elevated inflammatory markers. All of our patients underwent respiratory viral PCR testing, and 3/11 were positive for rhinovirus (Table 1). However, this was not considered to be the sole or a prominent reason for their clinical symptoms by the clinical team in accordance with the CDC case definitions [8].

Sixty-four percent (7/11) received oxygen supplementation and 45% (5/11) received non-invasive positive pressure ventilation. Eighty-two percent (9/11) of the patients were treated with antibiotics for possible community-acquired pneumonia, and almost all, 91% (10/11), were treated with varying doses of glucocorticoids. All 11 patients were admitted, while 45% (5/11) required admission to the intensive care unit, and the other patients were admitted to the general pediatric, pulmonary, or adolescent inpatient service. The median length of stay in the hospital was 5 days (range 2–10 days) (Table 1).

Initial chest radiographs were remarkable in that all cases demonstrated bilateral opacities, symmetric in 5/11. All cases were described as having an interstitial opacities, and 82% (9/11) had a basilar predominance of abnormalities (Fig. 1a). Five of the chest radiographs demonstrated alveolar opacities, but this was a less of a prominent finding in all but one case. Consolidations were not seen on any initial radiograph. No pleural effusions or pneumothoraces were seen, though one case had pneumomediastinum at presentation.

Fig. 1
figure1

a A 16 year-old male (patient 6) presents with cough, fever, and emesis. Chest radiograph on day of presentation demonstrates bilateral symmetric interstitial opacities in a basilar predominance distribution. b Coronal non-contrast CT chest in lung windows from the same day demonstrated bilateral, symmetric ground-glass (circle) and interstitial opacities (arrowhead) in an apical to basilar distribution with subpleural sparing (black arrows). Bronchial wall thickening is also seen (white arrow)

If performed, all patients also had positive imaging findings on CT. CT scans of the chest demonstrated a predominance of ground-glass opacities in all but one case. Two cases (20%) had subtle centrilobular ground-glass nodules at the apices. Six of ten demonstrated interstitial opacities described as a minor finding. None of the ten were described as having tree-in-bud opacities or mosaic attenuation. No cases had low-density opacities to suggest the presence of macroscopic focal lipids. Four (40%) had mild bronchial wall thickening. None were seen to have bronchiectasis or bronchial impaction. Distribution of disease was described as symmetric in 6 of 10. An apical to basilar predominance of disease distribution was seen in 8 of 10, while 7 of 10 had subpleural sparing (7 of the 9 of those with ground-glass opacities), and 4 with reverse halo sign of ground-glass opacities (Figs. 2 and 3) (Table 2).

Fig. 2
figure2

A17-year-old male (patient 3) with past medical history of asthma presented to the emergency department with increased work of breathing and hypoxia. Axial contrast-enhanced CT chest in lung windows demonstrates asymmetric bilateral ground-glass opacities with subpleural sparing (arrows) and reverse halo signs (arrowheads)

Fig. 3
figure3

A 17-year-old male (patient 11) with past medical history of asthma presented to the emergency department with respiratory failure, fever, and vomiting. Axial contrast-enhanced CT chest in lung windows demonstrates similar findings as in Fig. 2 with bilateral symmetric ground-glass opacities with subpleural sparing (arrows) and reverse halo signs seen bilaterally (arrow heads). Pneumomediastinum is also present (asterisk)

Table 2 Individual CT findings

The only patient (patient 7) who presented with an EVALI who did not test positive for THC had imaging findings that differed substantially. Multifocal dense consolidative opacities and small effusions were seen bilaterally on CT, not present in any of the other cases. Spirometry was not performed on this patient.

None of the other 9 cases had pleural effusions or pneumothorax. One pneumomediastinum was observed initially (Fig. 3). A second patient developed pneumomediastinum at a later date. Of note, neither of these patients were undergoing nor subsequently required mechanical ventilation.

Among the patients who underwent spirometry and diffusing capacity during their hospital stay and on a mean follow-up of 46 days, mean FEV1 increased from 81 (z-score = − 1.99) to 99% (z = − 0.1). Among the patients who underwent measurement of diffusion capacity, the mean diffusing capacity of the lung for carbon monoxide/alveolar volume (DLCO/VA) measured was 78% (z = − 1.68) during admission and 74.8% (z = − 1.99) on follow-up.

One patient underwent flexible bronchoscopy and bronchoalveolar lavage a month after discharge, as his sputum was positive for mycobacterium avium complex infection. The bronchoalveolar lavage did not grow non-tuberculous mycobacteria; however, it showed neutrophilia and lipid droplets in approximately 40–50% of the macrophages in oil red O stain. Since this patient did not have other findings to suggest mycobacterium avium complex infection, a decision was made to not treat him with anti-non-tuberculous mycobacterial therapy.

Discussion

The response of the lung to acute inhalation injury is limited despite many potential causes. Vaping poses a quandary as to the exact offending agent, with cannabinoid compounds or vitamin E having been raised as possibilities. These agents are related to alteration of initially licit products [1, 4]. The resultant effect on the lungs is also not clear to our knowledge, as this may be related to an inhaled oil, toxin, or perhaps allergen.

Our cohort consisted exclusively of teenagers. The clinical presentation was similar to the data presented by Layden et al. [8], and most of our patients vaped THC products. While a prior report of patients with EVALI has shown reduced lung function and diffusing capacity during admission [7], in this study, we have shown a discrepancy between spirometry and diffusing capacity on follow-up. In comparing pulmonary function testing in the hospital and at 46-day follow-up, FEV1 was mildly reduced and increased by 18%, but DLCO/VA was mildly to moderately reduced and did not improve. This impaired diffusion capacity, and the lack of improvement on follow-up, indicates damage to the blood-gas barrier and is consistent with the ground-glass and interstitial infiltrates seen on CT scan.

The overall imaging appearances of our cohort demonstrate a pattern that is similar to HP and OP. This is most evident in that there was a predominance of ground-glass opacities with an apical to basilar gradient of worsening disease and striking subpleural sparing seen in most cases with several demonstrating reverse halo sign. These are in line with several other recent studies also demonstrating subpleural sparing [7, 8, 13, 18, 19]. The only patient who tested negative for THC and had multifocal consolidations was felt to represent a case of true multifocal pneumonia rather than EVALI.

Findings similar to OP has been described in EVALI patients [7, 13]. While the imaging appearances of OP can vary, the predominant finding of the diffuse form of OP is peripheral and peribronchial opacities [20]. Subpleural sparing similar to the majority of our cases has been described in OP as well. A classically described relatively specific though non-sensitive finding in OP is a reverse halo opacity, as was seen in several of our patients [20].

HP can be categorized as acute, subacute, or chronic, and requires an antigen exposure. Like OP, the radiographic appearance of HP can vary widely. The most prominent finding is typically extensive ground-glass opacities. In addition, centrilobular ground-glass nodules and mosaic attenuation may appear in the acute form [21]. The “headcheese sign” of HP represents a combination of ground-glass and mosaic attenuations. Of these classically described patterns, only the dominant ground-glass opacities are seen in our cohort. Interestingly, HP can also mimic OP or has features of OP, resulting in a confusing and overlapping CT appearance [21, 22].

Lipoid pneumonia is often attributed to the inadvertent inhalation of macroscopic oils and fats resulting in a specific CT finding of low-density areas of consolidation corresponding to macroscopic fat [23]. No cases in our cohort or in the publish literature has had this CT finding. A less-specific though common CT finding of lipoid pneumonia of bilateral segmental or lobar ground-glass opacities is common in our cases. While initial reports described EVALI as a potential exogenous lipoid pneumonia, they were reported as secondary to only BAL findings with lipid laden macrophages, as also seen in our single case which underwent BAL. These microscopic lipids are not resolvable by CT and may not be related to macroscopic fat ingested described with lipoid pneumonia. Furthermore, two recent reviews of biopsied patients with EVALI did not reveal any lipids [24, 25].

Lastly, none of our subjects were tested for the novel coronavirus, SARS-CoV2, since all imaging studies were done before December 2019 and clinical testing for the novel coronavirus was not yet available in Philadelphia at that time. Since the first case of COVID-19, the illness caused by SARS-CoV2 was not described in the USA until January 20, 2020 [26], we do not believe that any of our subjects had COVID-19. However it is noteworthy that some of the radiological abnormalities of EVALI and COVID-19 can overlap [27,28,29]. COVID-19 features deemed typical by consensus reporting [30, 31] include bilateral lower lobe predominant ground-glass opacities that can be subpleural. However, subpleural sparing is not described as a typical feature, a differentiating feature of EVALI. Furthermore, COVID-19 may appear as OP later in the disease course, similar to EVALI. In addition to both EVALI and COVID-19 resulting in respiratory symptoms, other constitutional symptoms are seen in both conditions, most notably abdominal pain, further clouding the picture. With many overlapping features between these two entities, COVID-19 should now be considered in the differential diagnosis of EVALI, particularly in atypical or indeterminant COVID-19 features, with history and laboratory abnormalities also aiding in attempt to distinguish these entities.

Conclusion

Vaping-related lung injury can be recognized based on clinical history and radiologic appearance. The lung function effects of vaping are consistent with mildly reduced airflow, which improves on follow-up testing, and reduced diffusion capacity, which, concerningly, does not improve. Classifying the CT findings as a specific previously defined entity is extremely difficult due to the current limited pathologic information of EVALI, though an imaging pattern has emerged similar to that of organizing pneumonia and hypersensitivity pneumonitis. Bilateral ground-glass opacities worse at the base with subpleural sparing are common presenting CT signs. Without other known causes for such a CT appearance, such as the novel coronavirus, the evaluation for EVALI should be explored.

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Correspondence to Jordan B. Rapp.

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Chidambaram, A.G., Dennis, R.A., Biko, D.M. et al. Clinical and radiological characteristics of e-cigarette or vaping product use associated lung injury. Emerg Radiol (2020). https://doi.org/10.1007/s10140-020-01796-z

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Keywords

  • EVALI
  • Chest
  • Adolescents
  • PFTs