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A Rare Complication of Seasonal Influenza: Case Report and a Brief Review of the Literature

Irsa Munir, Talha Mehmood, Amena Fatima Mohiuddin, Moro O. Salifu, Isabel M. McFarlane*

Department of Internal Medicine, State University of New York, Downstate Health Sciences University, Brooklyn, NY, USA 11203

Abstract: Acute viral myositis is a rare condition that is commonly defined with influenza A, B, and enterovirus in the United States of America. Viral myositis complicated by rhabdomyolysis is even less common but requires prompt attention and diagnosis to prevent complications. We describe the occurrence of acute viral myositis complicated by rhabdomyolysis in a young 43-year-old man that lead to acute renal failure. It also highlights that clinicians should keep in mind that viral upper respiratory infections can be complicated with various clinical manifestations that could extend beyond respiratory symptoms.

Keywords: influenza, rhabdomyolysis, acute kidney injury, myositis, viral myositis

Received April 27, 2020; Revised May 29, 2020; Accepted June 05, 2020

Citation: Irsa Munir, Talha Mehmood, Amena Fatima Mohiuddin, Moro O. Salifu, Isabel M. McFarlane, A Rare Complication of Seasonal Influenza: Case Report and a Brief Review of the Literature. American Journal of Medical Case Reports, 8 (9). 293-298. January 2020. doi:10.12691/ajmcr-8-9-10

1. Introduction

Acute viral myositis is a rare defined complication of influenza [1,2,3]. Viral myositis occurs in the early recovery phase of influenza [4]. Cases have been defined with both influenza A and B [1,2,3,4,5,6,7,8,9,10]. In most cases, patients present with an isolated elevation of serum creatine kinase levels. Most of the cases are in the pediatric population, however viral myositis is universally found in the adult population as well [1,3]. During the influenza pandemic of 2009, there are many reported cases in adults as well [5,6,7] Some rare cases of rhabdomyolysis and severe myositis associated with influenza infections are also defined in the literature [6,7,8,9,10,11,12]. Cases of rhabdomyolysis are more commonly associated with influenza A [1,5,6,7,8,9]. The pathophysiology leading to myositis is unclear and several hypotheses have been postulated. Several studies listed the three possible mechanisms responsible for triggering muscle breakdown and in severe cases leading to rhabdomyolysis which include direct muscle invasion by the influenza virus, viral toxins causing direct muscle damage and cytokine storm triggered by the immunologic reaction [11,13,14]. Viral studies have also shown the NB protein found in influenzas B may have myotropic properties and can serve as an entity for viral entry [15]. Here, we present an interesting case of rhabdomyolysis and acute renal failure in a 43-year-old man who was diagnosed with influenza B.

2. Case Presentation

A 43-year-old man with no significant past medical history presented to our Institution with a four-day history of fevers, myalgias, cough, arthralgias, and generalized weakness. On the initial presentation, the patient was febrile to 102° F with an oxygen saturation of 88%. His labs were significant for normal leukocyte count with a left shift, elevated creatinine, transaminitis, and hypocalcemia. The lactate was 2.4 mmol/L. His procalcitonin was inconclusive at 0.55 ng/ml. Initial creatinine kinase (CK) was 1289 ng/ml. Blood cultures were drawn. The initial chest X-ray showed minimal left lower lobe atelectasis. A chest CT scan showed left lower lobe consolidation with a focus of right lower lobe consolidation as well. The patient was started on intravenous fluids as well as ceftriaxone and azithromycin due to underlying concern for pneumonia. The patient was then admitted for further work-up. The respiratory viral panel was positive for influenza B. Urinalysis was positive for red blood cells and proteinuria. Blood cultures and sputum cultures were negative. Urine legionella and urine streptococcal antigens were negative as well. The patient was continued on IV antibiotics however, his hospital course got complicated by up trending creatinine and CK, worsening edema, decreased urine output with a change in urine color to dark brown. Some further testing was done including urine myoglobin and urine osmolality which were abnormal. In the setting of worsening acute renal injury, proteinuria and hematuria implying a glomerular cause of AKI, nephrology and rheumatology services were consulted. Renal biopsy was done to delineate the underlying pathophysiology. Thyroid function tests were within normal limits. As per rheumatology recommendations, an extensive workup for autoimmune causes was done. The patient was tested for ANA, Anti ds-DNA, LKM Ab, complement levels, anti-smooth muscle cells Ab, p-ANCA, c-ANCA, Anti Jo-1 antibodies, glomerular basement membrane antibodies, anti-streptolysin-1 antibodies and myositis panel which came back negative. Extensive lab work up lacked enough evidence to suggest a rheumatological connective tissue disease in this previously young healthy male with negative serologies and acute presentation. Clinical history of acute onset of symptoms is also not typical of an inflammatory autoimmune myopathy, furthermore it is also atypical for an inflammatory myopathy to present with glomerular disease.

Patient’s kidney function deteriorated and required the need for urgent hemodialysis in the setting of hypocalcemia and fluid overload. His CK levels were trended daily. A week after starting hemodialysis, CK levels and creatinine levels started to downtrend. The urine output improved, and peripheral edema decreased. Two weeks after initiating hemodialysis, the dialysis catheter was removed. During a follow-up visit two weeks after discharge, the kidney function continued to show improvement with creatinine level dropping to 1.64mg/dL. The kidney biopsy findings were significant for acute tubular necrosis with tubular casts, a plausible explanation was tubular injury secondary to myoglobin.

Table 1. Complete Blood Count

Table 2. Comprehensive metabolic panel

Table 3. Urinalysis

Table 4. Other Labs

Image 1. Chest radiograph revealing left lower lobe atelectasis

Image 2. Computed tomograhy of the chest without contrast demonstrating lef lower lobe consolidation and foci of right lower lobe consolidation compatible with pneumonia. Scattered mediastinal lymphadenopathy likely reactive are also seen

Image 3. A (left, glomerulus and cast) and 3B (right, glomerulus and acute tubular epithelial cell injury). Renal biopsy showed no hypercellularity, necrosis, and crescents in the glomeruli. Foci of tubular casts with fuchsinophilia, ectatic angulated tubular profiles with foci of tubular epithelial cell simplification, interstitial edema and patchy mononuclear interstitial inflammation with plasma cells are present

Image 4. Negative Immunofluorescence studies IgA (left), C3 complement (right)

Direct Immunofluorescence The glomeruli have no staining with antisera specific for IgG, IgA, IgM, C1q, kappa light chains, and lambda light chains. The glomeruli have granular mesangial, mostly hilar, staining with anti-serum specific for C3 (1+). Scattered interstitial plasma cell cytoplasmic reactivity with antisera specific for IgG, kappa light chains and lambda light chains are present. Weak tubulointerstitial fibrinogen usual reactivity is present and usual reactivity with antiserum specific for albumin is present

3. Discussion

Acute viral myositis complicated by rhabdomyolysis is rare but can be a very serious and life-threatening complication of influenza infection which presents itself as a global burden every year [1,2,3,4,5,6,7,8,9,10,11]. It has been defined with the following virus: influenza [1,2,3,4,5,6,7,8,9,10,11,12,15], coxsackievirus [13], Epstein-Barr virus[16], adenovirus[17], echovirus [18], cytomegalovirus[19], measles virus [20], varicella-zoster virus [21], human immunodeficiency virus [22], dengue virus [23], parainfluenza [24], and herpes simplex virus [25]. According to one study, the most common viral agent responsible for viral-induced rhabdomyolysis is the influenza virus reported in 33% of cases [26]. In another retrospective study of the pediatric population, 38% of cases of rhabdomyolysis were viral induced [27].

Some studies highlighted that elevated CK levels are associated with worse complications as a result of influenza infection and this trend was noted in the 2009 pandemic of influenzas infection [28,29]. For diagnosis of rhabdomyolysis, a preceding viral infection is a clue with elevated CK levels. With underlying rhabdomyolysis, it is not uncommon to get very high levels of CK levels >100,000 U/L. Also, transaminitis, elevated creatinine, and myoglobinuria are present as a sequel. It is more likely to detect an underlying virus responsible early in the course of infection. In the detection of viral myositis, a muscle biopsy is not a helpful tool as it can be normal or inconclusive [13,26].

The mechanism responsible for causing viral myositis is not clear, there is some hypothesis that suggests the following likely underlying mechanisms:

1. The virus causing direct myocyte invasion. Interestingly, many muscle biopsies done for diagnostic purposes are either normal or inconclusive and, in most cases, a virus has not been detected. One study demonstrated the expression of alpha 2,3 and alpha 2,6- linked sialic acid receptors on muscle cells, which are the same as located on respiratory epithelial cells [10,30].

2. Toxic cytokines that are released by the human body as a result of infection, one study of viral-induced rhabdomyolysis reported elevated levels of tumor necrosis factor in the serum. TNF has shown to cause muscle breakdown in some experimental studies done on animals [10,13].

3. Immunological reaction due to viral infection causing myocyte breakdown. Studies have proposed antigenic mimicry, the release of sequestered antigen or T cells with dual T cells receptors arising in response to infection as underlying possible immunologic reactions [10,14].

Viral myositis is one of the less common complications of influenza infection seen especially in children however, it has been increasingly reported among adults as well. Clinicians should keep in consideration the possibility of rhabdomyolysis in a patient with influenza presenting with generalized body aches, myalgias, and dark urine. Healthcare providers play a significant role in creating awareness about the importance of influenza vaccination. On large study from Japan during the influenza season, 2013-2014 involving more than 300,000 subjects between the ages of 1-64 years demonstrated significant prevention of influenza onset and more effectiveness in reducing the secondary risk of influenza complications [31]. Another study from the 2015-2016 influenza predominant season in the United States demonstrated the protective effects of influenza vaccination for all age groups. It reduced influenza-related hospitalization by 51% in patients who are at risk of developing a serious infection or complications due to underlying comorbidities [32]. Keeping in view that influenza poses a global burden every year, awareness and patient education should be encouraged among our patient population to increase the number of vaccinated individuals in order to prevent both the risk of serious infections and its complications.

Acknowledgements

This work is supported, in part, by the efforts of Dr. Moro O. Salifu M.D., M.P.H., M.B.A., M.A.C.P., Professor and Chairman of Medicine through NIH Grant No. S21MD012474.

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