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Complications of Peritonsillar Abscess Tejs Ehlers Klug1* , Thomas Greve2 and Malene Hentze1

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Complications of Peritonsillar Abscess Tejs Ehlers Klug1* , Thomas Greve2 and Malene Hentze1 Klug et al. Ann Clin Microbiol Antimicrob (2020) 19:32 https://doi.org/10.1186/s12941-020-00375-x Annals of Clinical Microbiology and Antimicrobials REVIEW Open Access Complications of peritonsillar abscess Tejs Ehlers Klug1* , Thomas Greve2 and Malene Hentze1 Abstract Background: The vast majority of patients with peritonsillar abscess (PTA) recover uneventfully on abscess drain- age and antibiotic therapy. However, occasionally patient´s condition deteriorates as the infection spread in the upper airway mucosa, through cervical tissues, or hematogenously. The bacterial etiology of PTA is unclarifed and the preferred antimicrobial regimen remains controversial. The current narrative review was carried out with an aim to (1) describe the spectrum of complications previously recognized in patients with peritonsillar abscess (PTA), (2) describe the bacterial fndings in PTA-associated complications, and (3) describe the time relation between PTA and complications. Methods: Systematic searches in the Medline and EMBASE databases were conducted and data on cases with PTA and one or more complications were elicited. Results: Seventeen diferent complications of PTA were reported. The most frequently described complications were descending mediastinitis (n 113), para- and retropharyngeal abscess (n 96), necrotizing fasciitis (n 38), and Lemierre´s syndrome (n 35). Males= constituted 70% of cases and 49% of patients= were > 40 years of age. The= overall mortality rate was 10%. The= most prevalent bacteria were viridans group streptococci (n 41, 25%), beta-hemolytic streptococci (n 32, 20%), F. necrophorum (n 21, 13%), S. aureus (n 18, 11%), Prevotella= species (n 17, 10%), and Bacteroides species= (n 14, 9%). Simultaneous= diagnosis of PTA and complication= was more common= (59%) than development of complication= after PTA treatment (36%) or recognition of complication prior to PTA (6%). Conclusion: Clinicians involved in the management of PTA patients should be aware of the wide range of complica- tions, which may arise in association with PTA development. Especially males and patients > 40 years of age seem to be at an increased risk of complicated disease. In addition to Group A streptococci and F. necrophorum, the current fndings suggest that viridans group streptococci, S. aureus, Prevotella, and Bacteroides may also play occasional roles in the development of PTA as well as spread of infection. Complications occasionally develop in PTA patients, who are treated with antibiotics and surgical drainage. Keywords: Peritonsillar abscess, Complications, Bacteria, Microbiology Background salivary duct system [1]. Te incidence of PTA peaks in Peritonsillar abscess (PTA) refers to pus collection young adult life (15–19 years: 167 per 100,000 popula- between the tonsillar capsule and the pharyngeal con- tion) [2]. A polymicrobial mixture of aerobes and anaer- strictor muscle. Te pathogenesis is unclarifed, but obes is commonly recovered from pus aspirates, but closely related to an initial acute tonsillitis and it is likely there is only substantial evidence to suggest pathogenic that bacteria spread to the peritonsillar space via the importance of Group A streptococci and F. necrophorum [3–5]. Tese two pathogens are commonly recovered in *Correspondence: [email protected] less than 50% of cases and it seems obvious that more 1 Department of Otorhinolaryngology, Head and Neck Surgery, pathogens are involved in PTA development, but the Aarhus University Hospital, Palle Juul-Jensens Boulevard 99 Aarhus N, plethora of diferent bacteria found in an area with heavy Aarhus 8200, Denmark Full list of author information is available at the end of the article bacterial colonization, makes it difcult to pinpoint the © The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creat iveco mmons .org/licen ses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creat iveco mmons .org/publi cdoma in/ zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. Klug et al. Ann Clin Microbiol Antimicrob (2020) 19:32 Page 2 of 17 pathogenic bacteria from insignifcant bystanders [5]. aim to identify cases with PTA and one or more compli- Terefore, the signifcant pathogens are unclear in the cations and elicit data describing these cases. No com- majority of PTA cases. mon defnition of each complication entity was used, but Treatment of PTA consists of surgical drainage and the inclusion of each article was based on the author´s antimicrobial therapy. Tere are three accepted methods statements concerning the fnding of PTA, the defned of drainage: needle aspiration, incision, and acute tonsil- complication and the (likely) causality. Te only excep- lectomy. All three methods carry advantages and limita- tion from this reliance on author´s diagnosis, was in the tions [5]. Mirroring the unclarifed bacterial etiology, the diferentiation between cervical necrotizing fasciitis (NF) preferred antibiotics vary between centers and multiple and descending mediastinitis (DM), which was uniformly regimens have been reported in recent literature [6–8]. untouched in the publications. We categorized patients Most likely, the vast majority of PTA patients recover with described mediastinitis (with or without cervical uneventfully on abscess drainage and antibiotic therapy. necrosis) in the DM category and patients with cervi- However, the condition of PTA patients occasionally cal necrosis, but no mediastinitis, in the NF category. deteriorates as the infection spread in the upper airway Some patients sufered multiple complications. In these mucosa, through cervical tissues, or hematogenously. It cases, patients were categorized according to the com- is undescribed whether patients with complicated PTA plication deemed most severe (order: 1. upper airway consult health care professionals before the develop- obstruction < acute epiglottis < para- and retropharyngeal ment of complications or if they present with PTA and abscess < NF < DM. 2. sepsis < Lemierres syndrome (LS)). complication simultaneously. Hence, the proportion of We excluded complications deemed to be caused by the PTA complications, which are potentially preventable, is surgical treatment of PTA (i.e. post-tonsillectomy hem- unexplored. orrhage) and pathology associated with uncomplicated When searching the literature, we were surprised to PTA (i.e. velo-pharyngeal insufciency). For this review, acknowledge that no previous attempts for providing complication was defned as worsening in disease sever- a comprehensive review of complications to PTA have ity or the development of new symptoms or pathological been done. Hence, little help was provided for clinicians, changes, which may become widespread. who encounter PTA patients with signs of further infec- Statistical analyses (using STATA 15.1) were performed tious spread and who requested an overview of this feld. using the binomial probability test for gender distribu- Te aims of the current review were threefold: tion and the Fisher´s exact test to compare mortality rates between genders. 1. To describe the spectrum of complications previ- ously recognized in PTA patients. Results and discussion 2. To describe the bacterial fndings in PTA-associated Overview complications, which may suggest pathogenic impor- Te literature searches identifed 1,047 unique records tance and be subject to increased attention. and 27 records were added from the refence lists (Fig. 1). 3. To describe the time relation between PTA and com- Trough title, abstract, and full-text evaluation 921 plications in order to assess the proportion of com- records were excluded and 150 records were included in plications, which may be avoidable. this review. In total, 334 patients with PTA and one or more associ- ated complications were found in the literature. Te most Main text frequently described complications were DM (n = 113), Materials and methods para- and retropharyngeal abscess (n = 96), NF (n = 38) Te Medline and EMBASE databases were systematically and LS (n = 35) (Table 1). Tere was a signifcant male searched for studies reporting on patients with PTA and preponderance (70%, p < 0.001, Binomial probability test) complications (see search strings in the Additional fle 1: and males outnumbered females in all complication enti- Appendix). Publications after 1980 in English, Danish, ties with more than two described cases. Information on and German were considered. Te last search was per- the time relation between diagnosis of PTA and compli- formed June 28, 2020. In addition, an extensive manual cation was available in 126 (38%) cases (Table 1). In these search using the reference lists (from articles included) cases, 45 (36%) patients had PTA prior
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