Case Report: An Unusual Case of Biventricular Thrombosis in a COVID-19 Patient With Ischemic Dilated Cardiomyopathy: Assessment of Mass Mobility and Embolic Risk by Tissue Doppler Imaging
Andrea Sonaglioni1 
Adriana Albini2* Gian Luigi Nicolosi3 Elisabetta Rigamonti1 
Douglas M. Noonan2,4 Michele Lombardo1- 1Department of Cardiology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Multi Medica, Milan, Italy
- 2Scientific and Technological Pole, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Multi Medica, Milan, Italy
- 3Department of Cardiology, Policlinico San Giorgio, Pordenone, Italy
- 4Department of Biotechnology and Life Sciences, University of Insubria, Varese, Italy
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike protein binds to angiotensin-converting enzyme 2 (ACE2) receptor on vascular cells. As a consequence, patients with COVID-19 have an increased incidence of thromboembolic complications of the SARS-CoV-2 infection and subsequent endothelial cell damage with consequence of development of systemic vasculitis and diffuse intravascular coagulation. The present case describes a COVID-19 female patient with ischemic dilated cardiomyopathy, who presented with congestive heart failure and echocardiographic evidence of biventricular apical thrombi. The peak antegrade longitudinal velocity (Va) of each thrombotic mass was measured by pulsed wave tissue Doppler imaging (PW-TDI). Both left ventricular and right ventricular apical thrombi were found with a TDI-derived mass peak Va < 10 cm/s. There was no clinical evidence of neither systemic nor pulmonary embolization, probably due to the hypomobility of both left and right ventricular masses.
Introduction
Left ventricular (LV) thrombosis can complicate both ischemic and non-ischemic cardiomyopathies and can lead to arterial embolic complications such as stroke (1, 2). However, the occurrence of biventricular thrombi is very rare and only few cases have been previously described in literature (3–9). Here, we report the case of an 80-year-old woman infected by Coronavirus 2019 (COVID-19), presenting with congestive heart failure (CHF) due to ischemic dilated cardiomyopathy (DCM), who was diagnosed with biventricular apical thrombi by transthoracic echocardiography (TTE).
Clinical Course
An 80-year-old woman, BSA 1.62 m2, body mass index (BMI) 22.6 Kg/m2 with history of coronary artery disease presented to the Emergency Department (ED) with worsening dyspnea, non-productive cough, fatigue, and bilateral leg swelling. She had prior anterior myocardial infarction treated with percutaneous transluminal coronary angioplasty of the proximal left anterior descending coronary artery in 2019 and subsequent unfavorable evolution in DCM with severe systolic dysfunction (estimated left ventricular ejection fraction of 20%) and chronic renal failure (estimated glomerular filtration rate of 30 ml/min/1.73 m2). She was in home-therapy with acetyl salicylic acid 75 mg/die, furosemide 50 mg/die, spironolactone 25 mg/die, and rosuvastatin 5 mg/die.
Parameters recorded at the admission were the following: body temperature 36.5°C, heart rate 82 beats per minute, blood pressure 150/90 mmHg, respiratory rate 28 times per minute, and oxygen saturation 90% on ambient air.
Blood tests showed a white blood cell count of 8,720/mmc (88.0% neutrophils and 8.0% lymphocytes), hemoglobin 16.5 g/dl, C-reactive protein at the level of 11.1 mg/dl (reference range 0.05–0.50 mg/dl), estimated glomerular filtration rate 25 ml/min/1.73 m2, B-type natriuretic peptide level >20,000 pg/ml, D-dimer at the level of 17,108 ng/ml (reference range 1–500 ng/ml), and troponin I at the level of 0.08 ng/ml (reference range 0.00–0.04 ng/ml).
The electrocardiogram showed sinus rhythm, poor R wave progression in precordials, suggestive of old large anterior myocardial infarction and QRS voltage <5 mm in all limb leads.
Chest x-ray showed cardiomegaly, bilateral interstitial infiltrates and bilateral pleural effusions (Figure 1). A positive rapid antigen test for Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV2) was confirmed by the molecular test at hospital admission. Therefore, the patient was transferred from the ED to the semi-intensive care unit for COVID-19 patients.
Figure 1. Posteroanterior chest x-ray view revealing cardiomegaly, bilateral interstitial infiltrates and bilateral pleural effusions.
A bedside TTE revealed the presence of large and roundish masses in the apex of both ventricles associated with severe biventricular dilatation (LV end-diastolic short axis diameter of 65 mm, right ventricular inflow tract of 45 mm) and dysfunction. Left ventricular ejection fraction (LVEF) estimated by modified Simpson's method was 15%, with dyskinesia/aneurism of the apex, and interventricular septum and marked hypokinesis of the other segments of the left ventricle. Right ventricular (RV) systolic function, measured by the tricuspid annular plane systolic excursion (TAPSE), was also severely impaired (TAPSE = 9 mm).
Both masses were acoustically distinct from underlying myocardium, with hypoechoic central space and hyperechoic border, well-circumscribed and sessile, attached to the apex of the left ventricle and of the right ventricle. The LV mass measured 23 mm × 21 mm, while the RV mass measured 18 mm × 15 mm. Both the masses were hypomobile and prominent in the apical 4-chamber view. Bilateral ventricular thrombi were diagnosed.
To precisely assess the mobility of the intracardiac thrombi, we employed pulsed-wave tissue Doppler imaging (PW-TDI) placing the sample volume at the level of the body of each mass. The peak antegrade longitudinal velocity (Va) of both LV and RV apical thrombi was measured.
Figure 2 illustrates the LV apical thrombus (Figure 2A) and the corresponding TDI-derived peak mass Va (Figure 2B), while Figure 3 depicts the RV apical thrombus (Figure 3A) and the relative TDI-derived peak mass Va (Figure 3B). Moderate mitral and tricuspid regurgitation, dilatation of the inferior vena cava and moderate pulmonary hypertension (the estimated systolic pulmonary artery pressure was 60 mmHg) were also detected.
Figure 2. Apical 4-chamber echocardiographic view showing a large and roundish LV apical thrombus with hypoechoic central space and hyperechoic border (A, red arrow). The LV thrombotic mass measured 23 mm × 21 mm. The TDI-derived LV mass peak Va was 5 cm/s, as depicted in panel (B). LA, left atrium; LV, left ventricular/left ventricle; TDI, tissue Doppler imaging; RA, right atrium; RV, right ventricle; Va, antegrade velocity.
Figure 3. Right ventricular focused 4-chamber echocardiographic view demonstrating RV (A, yellow arrow) and LV (A, red arrow) apical thrombi: both masses were found with hypoechoic central space and hyperechoic border. The RV thrombotic mass measured 18 mm × 15 mm. The TDI-derived RV mass peak Va was 7 cm/s, as depicted in panel (B). LV, left ventricular/left ventricle; TDI, tissue Doppler imaging; RV, right ventricular/right ventricle; Va, antegrade velocity.
The above-mentioned echocardiographic examination was compared with a previous TTE performed in October 2020 that showed severe biventricular dilatation and dysfunction (LV ejection fraction of 20%, TAPSE of 13 mm), with no evidence of ventricular thrombi.
The diagnosis of CHF due to ischemic DCM complicated with biventricular thrombi in a COVID-19 patient was made. Thrombosis at other sites was excluded; no deep vein thrombosis of the abdomen and lower extremities was found by ultrasonography.
Conventional treatment for CHF with loop diuretics (intravenous furosemide 120 mg/die and canrenone 100 mg/die) and beta-blockers (bisoprolol 2.5 mg/die) was started. Moreover, the patient received antibiotic treatment (intravenous piperacillin and tazobactam three times daily) and oxygen therapy via nasal cannula (2 l/min). Low molecular weight heparin (enoxaparin sodium) was administered for the treatment of biventricular thrombosis (4,000 IU twice daily by subcutaneous injection).
During the hospitalization, the patient underwent diagnostic thrombophilia testing. Results showed that serum levels of protein C, protein S, antithrombin III, factor V Leiden, and antiphospholipid antibody were normal.
A subsequent TTE, performed after 10 days of anticoagulant treatment, showed the complete dissolution of both left and right ventricular thrombi (Figure 4). There was no clinical evidence of neither systemic nor pulmonary embolization, probably due to the hypomobility of both left, and right ventricular masses.
Figure 4. Apical 4-chamber echocardiographic view showing disappearance of both RV and LV thrombotic masses after 10 days of anticoagulant treatment. LA, left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle.
However, severe biventricular dysfunction persisted, and refractory CHF occurred, despite intensive diuretic therapy. The patient underwent serial chest x-ray which showed progressive increase of pulmonary congestion and interstitial infiltrates. Computed tomography scan was not performed due to the critical condition of the patient and the absence of clinical signs of pulmonary/systemic embolization. Finally, the patient's clinical conditions worsened, and she died 15 days after hospitalization.
Discussion
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike protein binds to angiotensin-converting enzyme 2 (ACE2) receptor on vascular cells (10, 11). On endothelial cells from arterial and venous vessels there is ACE2 expression and there is evidence that endothelial cells are prone to SARS-CoV-2 infection which causes subsequent endothelial cell damage with development of systemic vasculitis and disseminated intravascular coagulation (DIC) (10). Since the beginning of the COVID-19 pandemic, severe hypercoagulability and serious thrombotic complications have been reported in infected patients, especially in those patients who are admitted to intensive care unit (12–16). The most common thromboembolic complications detected in COVID-19 patients were deep vein thrombosis, acute pulmonary embolism, coronary and cerebral thrombosis, systemic arterial embolism, and placental thrombosis (17–21).
The occurrence of biventricular thrombi is a rare, but serious condition which may increase the risk of both systemic and pulmonary embolization. Previous cases of biventricular thrombosis have been described in patients with severe ventricular dysfunction, autoimmune disease, HIV infection, nephrotic syndrome, hypereosinophilic syndrome, heparin-induced thrombocytopenia, and antiphospholipid syndrome (3–9).
To date, there are only three case reports in literature who described biventricular thrombi in a COVID-19 patient (22–24).
One patient, a 63-year-old woman, with a known medical history of emphysema and active smoker, 2-week history of worsening dyspnea, nonproductive cough, and chills, she was positive for SARS-CoV-2 as detected by PCR (22). After, few hours from admission she had a cardiac arrest with successful cardiorespiratory resuscitation. The patient had 93% oxygen saturation, elevated troponin I, creatinine kinase, and lactate, with normal platelet count, coagulation parameters, and fibrinogen (22). Cardiac tomography revealed a right ventricular thrombus, measuring 4 mm by 10 mm, a left ventricular thrombus 12-mm in thickness extending over a 6-cm perimeter (22). The patient died of cardiogenic and pulmonary septic shock.
Another patient, a 58-year-old man, had obesity (BMI of 31 kg/m2 on admission) and hypertension, he presented with intermittent fever and worsening shortness of breath on exertion he was positive for PCR SARS-CoV-2 (23). The patient initial clinical examination was normal except for an outstanding oxygen requirement. The patient had high C-reactive protein (CRP) D-dimer was significantly elevated, with normal prothrombin time and activated partial thromboplastin time, no pulmonary thromboembolism appeared on CT pulmonary angiography (23). On day 4 the D-dimer levels were noted to have risen, and on day 9 they were steadily rising. On day 9, CT pulmonary angiography revealed simultaneous bilateral pulmonary thromboembolism, biventricular cardiac thrombi (23). The patient with multiple thromboses had appropriate prophylactic and therapeutic LMWH is this case (23). The patient was successfully discharged on day 19.
A 58-year-old African-American male, with a history of hypertension and diabetes mellitus, was brought to emergency room (24). He had 60% oxygen saturation the clinical laboratory test showed a hypercoagulable state (Fibrinogen was low and high D-dimer levels, PT 36 s, INR 3.6, and aPTT of 100 s) normal troponin I, CK, CK-MB at normal levels (24). He was taking care of parents, confirmed positive with COVID-19. In this patient transthoracic echocardiography has seen left ventricle extensive mural thrombus and highly mobile thrombus the in right atrium with extensive biventricular thrombi (24). The patient died of ventricular fibrillation within 24 h.
Obesity is one of the complications of the COVID-19 patients (25). The BMI of the African-American male, with a history of hypertension and diabetes mellitus, and 63-year-old woman active smoker and emphysema was not mentioned in these case reports (22, 24). In all the case reports of biventricular thrombi and COVID-19 the patients were ~60 years.
In this case report, a 80 years COVID-19 patient with CHF due to ischemic DCM was diagnosed with LV and RV apical thrombi. Our patient had severely depressed systolic biventricular function, suggesting a high risk of ventricular thrombi. However, she was never diagnosed with ventricular thrombi prior to admission and was tested negative for thrombophilia screening during hospitalization. As far as we know, this is the first case of biventricular thrombi described in a COVID-19 patient with ischemic dilated cardiomyopathy.
As proposed by Mehta et al. (26), the combination of a progressive dysregulated coagulative response to SARS-CoV-2 with consequent activation of a state of hypercoagulability and the blood stasis due to severe biventricular dilatation and contractile dysfunction might have contributed to the formation of LV and RV apical thrombi.
In the present case, the D-dimer level of the patient was 17,108 ng/ml, well-above reference values, and the patient was treated with low-molecular-weight heparin, while the surgical thrombectomy was not considered due to the patient's advanced age and the severe CHF. The 63 years woman patient coagulation parameters were normal, but the authors mention the D-dimer (22). In the two male cases D-dimers were highly elevated (23, 24).
In the present case, contrast echocardiography, which is particularly advantageous for detection of small or mural thrombi (27), was not performed to confirm the diagnosis of LV and RV apical thrombi, because both thrombotic masses were large in size and protuberant in shape. On the other hand, PW-TDI was useful to precisely assessing the mobility of the intracardiac thrombi. Therefore, the diagnosis of biventricular thrombosis was performed and confirmed by TTE, whereas PW-TDI provided a rapid characterization of mass-mobility. Differently from previous case reports which described biventricular thrombi detected by TTE in different clinical settings (3–9), our case is the only one that employed a TTE implemented with PW-TDI assessment of the thrombotic mass mobility in a COVID-19 patient.
Our previous prospective analysis performed on 72 patients with echocardiographically detected LV thrombi revealed that a TDI-derived mass peak Va ≥ 10 cm/s, was the most important and independent predictor of outcome at mid-term follow-up (28). Therefore, we demonstrated that the TDI-derived mass peak Va might represent a new objective marker of thrombotic mass motility and that a mass peak Va ≥ 10 cm/s might stratify the hospitalized patients with increased probability of embolic events in a mid-term follow-up, regardless of the mass dimension.
In this present case, both LV and RV apical thrombi were found with a mass peak Va < 10 cm/sec, as assessed by PW-TDI, and the clinical course was not clinically complicated by systemic nor pulmonary embolization. However, the patient's clinical conditions quickly worsened due to SARS-CoV-2 severe pneumonia.
Conclusion
This is a rare case of ischemic dilated cardiomyopathy complicated with biventricular apical thrombi early detected by TTE in a patient that was infected by COVID-19. The present case demonstrates the clinical usefulness of TTE implemented with PW-TDI for detecting ventricular thrombi and for measuring the thrombotic mass mobility. Although a biventricular thrombosis is a rare COVID-19 complication, performing appropriate diagnostic tests could decrease COVID-19 mortality in patients with dilated cardiomyopathy.
Data Availability Statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Ethics Statement
Ethical review and approval was not required for the study on human participants in accordance with the local legislation and institutional requirements. Written informed consent for participation was not required for this study in accordance with the national legislation and the institutional requirements. Written informed consent was obtained for the publication of any potentially identifiable images or data included in this article.
Author Contributions
AS, ER, and ML performed the provided clinical procedures and collected the clinical data. AS, GN, ER, and ML analyzed the data and prepared the figures. AS, AA, DN, and ML discussed data and wrote the manuscript. All authors contributed to the article and approved the submitted version.
Funding
This research was funded by a grant of the Ministero della Salute COVID-2020-12371849 to DN and work was also supported by the Italian Ministry of Health Ricerca Corrente—IRCCS MultiMedica.
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher's Note
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References
1. Habash F, Vallurupalli S. Challenges in management of left ventricular thrombus. Ther Adv Cardiovasc Dis. (2017) 11:203–13. doi: 10.1177/1753944717711139
2. Lee JM, Park JJ, Jung HW, Cho YS, Oh IY, Yoon CH, et al. Left ventricular thrombus and subsequent thromboembolism, comparison of anticoagulation, surgical removal, antiplatelet agents. J Atheroscler Thromb. (2013) 20:73–93. doi: 10.5551/jat.13540
3. Missault L, Koch A, Colardyn F, Clement D. Biventricular thrombi in dilated cardiomyopathy: massive simultaneous pulmonary and systemic embolisation. Eur Heart J. (1994) 15:713–4. doi: 10.1093/oxfordjournals.eurheartj.a060574
4. Nishi I, Ishimitsu T, Ishizu T, Ueno Y, Suzuki A, Seo Y, et al. Peripartum cardiomyopathy and biventricular thrombi. Circ J. (2002) 66:863–5. doi: 10.1253/circj.66.863
5. Goncalves LF, Souto FM, Faro FN, Oliveira JL, Barreto-Filho JA, Sousa AC. Biventricular thrombus and endomyocardial fibrosis in antiphospholipid syndrome. Arq Bras Cardiol. (2012) 99:e162–5. doi: 10.1590/S0066-782X2012001400017
6. Hatanaka N, Ueda T. [Removal of biventricular thrombi for dilated cardiomyopathy in a patient with acute heart failure]. Kyobu Geka. (2014) 67:895–8.
7. Nkoke C, Kuate LM, Luchuo EB, Edie SD, Boombhi J, Menanga A. Biventricular thrombi in dilated cardiomyopathy in a patient with human immunodeficiency virus infection: a case report. BMC Res Notes. (2015) 8:168. doi: 10.1186/s13104-015-1140-x
8. Iwano T, Yunoki K, Tokunaga N, Shigetoshi M, Sugiyama H, Yamamoto H, et al. A case of biventricular thrombi in a patient with dilated cardiomyopathy: utility of multimodality imaging for diagnosis and management of treatment strategy. J Cardiol Cases. (2017) 15:91–4. doi: 10.1016/j.jccase.2016.10.013
9. Kammari CB, Rallabandi S, Rallabandi H, Daggubati SR, Adapa S, Naramala S, et al. Case report: dilated cardiomyopathy with biventricular thrombus secondary to impaired coagulation in a patient with HIV. F1000Res. (2020) 9:610. doi: 10.12688/f1000research.24016.2
10. Albini A, Di Guardo G, Noonan DM, Lombardo M. The SARS-CoV-2 receptor, ACE-2, is expressed on many different cell types: implications for ACE-inhibitor- and angiotensin II receptor blocker-based cardiovascular therapies. Intern Emerg Med. (2020) 15:759–66. doi: 10.1007/s11739-020-02364-6
11. Yang J, Petitjean SJL, Koehler M, Zhang Q, Dumitru AC, Chen W, et al. Molecular interaction and inhibition of SARS-CoV-2 binding to the ACE2 receptor. Nat Commun. (2020) 11:4541. doi: 10.1038/s41467-020-18319-6
12. Akel T, Qaqa F, Abuarqoub A, Shamoon F. Pulmonary embolism: a complication of COVID 19 infection. Thromb Res. (2020) 193:79–82. doi: 10.1016/j.thromres.2020.05.033
13. Klok FA, Kruip M, van der Meer NJM, Arbous MS, Gommers D, Kant KM, et al. Incidence of thrombotic complications in critically ill ICU patients with COVID-19. Thromb Res. (2020) 191:145–7. doi: 10.1016/j.thromres.2020.04.013
14. Middeldorp S, Coppens M, van Haaps TF, Foppen M, Vlaar AP, Muller MCA, et al. Incidence of venous thromboembolism in hospitalized patients with COVID-19. J Thromb Haemost. (2020) 18:1995–2002. doi: 10.1111/jth.14888
15. Paterson RW, Brown RL, Benjamin L, Nortley R, Wiethoff S, Bharucha T, et al. The emerging spectrum of COVID-19 neurology: clinical, radiological and laboratory findings. Brain. (2020) 143:3104–20. doi: 10.1093/brain/awaa240
16. Poissy J, Goutay J, Caplan M, Parmentier E, Duburcq T, Lassalle F, et al. Pulmonary embolism in patients with COVID-19: awareness of an increased prevalence. Circulation. (2020) 142:184–6. doi: 10.1161/CIRCULATIONAHA.120.047430
17. Helms J, Tacquard C, Severac F, Leonard-Lorant I, Ohana M, Delabranche X, et al. High risk of thrombosis in patients with severe SARS-CoV-2 infection: a multicenter prospective cohort study. Intensive Care Med. (2020) 46:1089–98. doi: 10.1007/s00134-020-06062-x
18. Kollias A, Kyriakoulis KG, Stergiou GS, Syrigos K. Heterogeneity in reporting venous thromboembolic phenotypes in COVID-19: methodological issues and clinical implications. Br J Haematol. (2020) 190:529–32. doi: 10.1111/bjh.16993
19. Marietta M, Ageno W, Artoni A, De Candia E, Gresele P, Marchetti M, et al. COVID-19 and haemostasis: a position paper from Italian Society on Thrombosis and Haemostasis (SISET). Blood Transfus. (2020) 18:167–9. doi: 10.2450/2020.0083-20
20. Oxley TJ, Mocco J, Majidi S, Kellner CP, Shoirah H, Singh IP, et al. Large-vessel stroke as a presenting feature of Covid-19 in the young. N Engl J Med. (2020) 382:e60. doi: 10.1056/NEJMc2009787
21. Wise J. Covid-19 and thrombosis: what do we know about the risks and treatment? BMJ. (2020) 369:m2058. doi: 10.1136/bmj.m2058
22. Soltani M, Mansour S. Biventricular thrombi associated with myocardial infarction in a patient with COVID-19. Can J Cardiol. (2020) 36:1326.e9–1326.e11. doi: 10.1016/j.cjca.2020.06.016
23. Ferguson K, Quail N, Kewin P, Blyth KG. COVID-19 associated with extensive pulmonary arterial, intracardiac and peripheral arterial thrombosis. BMJ Case Rep. (2020) 13:e237460. doi: 10.1136/bcr-2020-237460
24. Ozer M, Abbasi F, Mahdi M, Goksu SY, Struble E. Massive biventricular thrombi complicating new-onset heart failure in a patient with suspected COVID-19. J Cardiol Cases. (2021). doi: 10.1016/j.jccase.2021.02.016. [Epub ahead of print].
25. Caci G, Albini A, Malerba M, Noonan DM, Pochetti P, Polosa R. COVID-19 and obesity: dangerous liaisons. J Clin Med. (2020) 9:2511. doi: 10.3390/jcm9082511
26. Mehta JL, Calcaterra G, Bassareo PP. COVID-19, thromboembolic risk, and Virchow's triad: lesson from the past. Clin Cardiol. (2020) 43:1362–7. doi: 10.1002/clc.23460
27. Aggeli C, Dimitroglou Y, Raftopoulos L, Sarri G, Mavrogeni S, Wong J, et al. Cardiac masses: the role of cardiovascular imaging in the differential diagnosis. Diagnostics (Basel). (2020) 10:1088. doi: 10.3390/diagnostics10121088
Keywords: COVID-19, biventricular thrombosis, pulsed wave tissue Doppler imaging, ACE2, dilated cardiomyopathy
Citation: Sonaglioni A, Albini A, Nicolosi GL, Rigamonti E, Noonan DM and Lombardo M (2021) Case Report: An Unusual Case of Biventricular Thrombosis in a COVID-19 Patient With Ischemic Dilated Cardiomyopathy: Assessment of Mass Mobility and Embolic Risk by Tissue Doppler Imaging. Front. Cardiovasc. Med. 8:694542. doi: 10.3389/fcvm.2021.694542
Received: 13 April 2021; Accepted: 21 June 2021;
Published: 29 July 2021.
Edited by:
Marijana Tadic, Universität Ulm, GermanyReviewed by:
Daniel Morris, Charité Universitätsmedizin Berlin, GermanyBranislava Ivanovic, Institute for Cardiovascular Diseases, Serbia
Copyright © 2021 Sonaglioni, Albini, Nicolosi, Rigamonti, Noonan and Lombardo. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Adriana Albini, albini.adriana@gmail.com