Management of descending necrotizing mediastinitis: an aggressive treatment for an aggressive disease

Demographic, clinical, and paraclinical features of patients operated with the diagnosis of acute descending necrotizing mediastinitis: a retrospective study in Southern Iran

INTRODUCTION

Descending necrotizing mediastinitis (DNM) is a type of acute mediastinitis that is rarely reported but is regarded as a fatal disease despite improvements in technological methods and antibiotic therapies. We aimed to determine the demographic, clinical, and paraclinical features of patients diagnosed with acute DNM.

METHODS

In this retrospective study, patients' hospital records with a diagnosis of DNM admitted to the Namazi hospital in southern Iran during 18 years (2002-2019) were reviewed. Demographic and clinical features were recorded and subsequently analyzed via SPSS 22.

RESULTS

Out of 67 mediastinitis patients, 25 (37.3%) were diagnosed as DNM with an average age of 37.2 ± 16.7 years, and 68% were male. Regarding etiology, 52.0% were due to neck infection. Based on the technique of surgery, 52% of the patients underwent the combined method, which was mostly among type I and IIA DNM, while thoracotomy was mostly performed on type IIB DNM (P = 0.08). Based on the incision, type IIA and IIB had the highest frequency of thoracotomy and cervicothoracic incisions (P = 0.02 and 0.002). Puss discharge was significantly lower in type I DNM (P = 0.01). Based on the presenting symptoms of our patients, the majority (72.0%) had a chief complaint of neck pain, followed by chills and fever (48%). There were no reports of mortality during our short-term follow-up.

CONCLUSION

We report one of the largest retrospective studies of DNM patients in our referral center, with a high prevalence of the disease among younger populations, especially under 40 years. The method of treatment should be chosen based on the extent of infection and can be limited to neck exploration in upper mediastinal infections, though thoracic or combined approach in more broad infections.

Surgical management of descending necrotizing mediastinitis: strategy for thoracic interference

BACKGROUND

The present descriptive study shares the overall experience of treating all these patients where different surgical process was adopted depending on the treatment required after carefully evaluating the risk factors and comorbidities.

METHODS

The present study was conducted at the Department of Thoracic Surgery, Choray Hospital, Vietnam between the period of 2010 to 2020. We have treated 95 patients altogether in this duration.

RESULTS

We were able to save most of the patients by applying thoracotomy and thoracic irrigation for most of the patients based on the observed indications that were identified immediately after the compulsory standard cervicotomy. The indication for thoracic interference was considered when the infection was deeply spread into the mediastinum and cannot get out through cervicotomy, although the most effective method of drainage was applied.

CONCLUSION

Our statistical investigation of the patient data suggested the possible association and influence of comorbidity such as diabetes. Therefore, we recommend that in specific cases thoracotomy along with thoracic irrigation and repetitive surgical draining could be a better option to reduce the infection and the mortality rate.

TRIAL REGISTRATION

Retrospectively registered.

Descending necrotizing mediastinitis: etiopathogenesis, diagnosis, treatment and long-term consequences-a retrospective follow-up study

PURPOSE

The primary aim of this retrospective study was to analyze the progression of descending necrotizing mediastinitis (DNM), evaluate the impact of comorbidities on complications and mortality and to observe long-term consequences of DNM on dysphagia and measurements quality of life. DNM is a serious infectious disease that requires multimodal treatment. Current literature varies in conclusions of risk factors, management and outcome of DNM. In addition, little is known about persisting effects on quality of life.

METHODS

Retrospective data analysis of 88 patients with DNM representing the largest single-center study. Recording data of patients and diseases as well as clinical progression from 1997 to 2018. Two questionnaires were sent to the participants to measure quality of life and to detect dysphagia.

RESULTS

88 patients were included. The most frequently found pathogen were Streptococcus spp. (52%). 75% of the patients underwent multiple surgeries, mean count of surgical procedures was 4.3 times. 84% received intensive care treatment. Median length of stay on the intensive care unit was 7 days. 51% had pre-existing comorbidities associated with reduced tissue oxygenation (e.g., diabetes). The most common complication was pleural effusion (45%). During the observation period, the mortality rate was 9%. 12 questionnaires could be evaluated. 67% of the participants were affected by dysphagia at the time of the survey.

CONCLUSIONS

Descending necrotizing mediastinitis (DNM) is a severe disease requiring an immediate initiation of multimodal treatment. Although quality of life usually isn´t impaired permanently, dysphagia may often persist in patients after DNM.

Management of descending necrotizing mediastinitis with severe thoracic empyema using minimally invasive video-assisted thoracoscopic surgery: a case report

BACKGROUND

Descending necrotizing mediastinitis (DNM) is a rare but serious complication of odontogenic or pharyngeal infection spreading into the mediastinum. Very few childhood cases of DNM have been described.

CASE DESCRIPTION

We report a case of DNM complicated with severe thoracic empyema in a previously healthy 6-year-old girl who was successfully treated using minimally invasive video-assisted thoracoscopic surgery (VATS). The patient presented with odynophagia and dental pain, followed by rapid clinical deterioration including high fever, tachypnea, and left chest pain. As chest computed tomography (CT) revealed features of DNM, she was transferred from the local hospital to our hospital for intensive care. Empirical treatment was started with meropenem and linezolid. However, her tachypnea and dyspnea progressed rapidly. An ultrasound-guided left-sided thoracentesis drained 80 mL of brown sticky pus and the pus culture yielded Streptococcus constellatus. A contrast-enhanced CT scan demonstrated large mediastinal abscess and severe thoracic empyema. We performed debridement and drainage of the mediastinum and pleura using VATS. She recovered and was discharged on hospital day 18.

CONCLUSIONS

Early diagnosis by cervicothoracic CT and multidisciplinary approaches including intensive care, broad-spectrum antibiotics, and aggressive surgical intervention are crucial to reducing morbidity and mortality. VATS is a minimally invasive and appropriate treatment strategy for children with DNM, especially complicated with thoracic empyema.

Detection of aerobe-anaerobe mixed infection by metagenomic next-generation sequencing in an adult suffering from descending necrotizing mediastinitis

BACKGROUND

Descending necrotizing mediastinitis (DNM) is one of the most virulent forms of mediastinitis. The main causes of high mortality in DNM are believed to stem from difficulty and delay in the diagnosis. Fast and accurate identification of pathogens is important for the treatment of these patients. Metagenomics next-generation sequencing (mNGS) is a powerful tool to identify all kinds of pathogens, especially for rare and complex infections.

CASE PRESENTATION

A 64-year-old male patient was admitted to the intensive care unit (ICU) with unconsciousness, dyspnea, and swelling in the mandible and neck. Computed tomography (CT) scan results combined with clinical laboratory examination indicated DNM. Vancomycin and imipenem were used, and vacuum sealing drainage was applied for debridement and drainage of the infected area. The positive mNGS results of drainage fluid confirmed the presence of mixed infection caused by Streptococcus anginosus, Prevotella oris, and several other anaerobes. The antibiotics were adjusted to piperacillin/tazobactam and tinidazole according to the mNGS results and antimicrobial susceptibility testing of cultured pathogens. After 11 days of antibiotic therapy, the infection symptoms of the neck and mediastinum improved, and the patient was transferred out of the ICU on the 26th day after negative result of drainage fluid culture.

CONCLUSION

This case suggested that mNGS is a promising technology for precise and fast pathogens identification with high sensitivity, which may guide the diagnosis of infectious diseases in the future trend.

A new classification of descending necrotizing mediastinitis and surgical strategies

Background

Descending necrotizing mediastinitis (DNM) is an inflammation occurring in the oropharynx and descending to the deep cervical space and mediastinum, which is a serious infectious disease. The investigation of a new classification system and treatment methods for DNM is still necessary.

Methods

A total of 139 patients with DNM caused by odontogenic or pharyngeal infection were retrospectively analyzed in last 20 years in the Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine. The patients were divided into the traditional treatment Group T (Group T: 43 patients) and the new classification Group N (Group N: 96 patients). A new DNM classification was developed based on the progression of mediastinal infection as follows: type Ia: infection in the anterosuperior mediastinum; type I: infection in the anterior mediastinum; type II: infection in the posterior mediastinum; and type III: infection of the whole mediastinum.

Results

There were 49, 8, 10, and 29 patients classified as type Ia, I, II, and III, respectively in the Group N. The type Ia DNM patients were managed with transcervical mediastinal drainage, and the patients with types I and II DNM underwent open (thoracoscopic) surgery, 1 patient within types I died. The 29 patients with type III were managed with unilateral or bilateral open (thoracoscopic) surgery, among them, 8 patients died. The mortality rate for patients with type III DNM was 27.6%. The overall mortality rate in Group N was 9.4%. The mortality rate for patients in the Group T was 25.6%. The mortality rate of Group N was significantly lower than that of Group T (P<0.05).

Conclusions

We have carried out a new clinical classification of DNM, and selected the appropriate treatment method according to the classification, and achieved a better effect than the traditional treatment method.

Minimally invasive transoral image-guided drainage of a retropharyngeal abscess with mediastinal extension

Retropharyngeal abscess (RPA) in children is a serious deep neck space infection that rarely is complicated by extension into the mediastinum. RPA with mediastinal abscess requires prompt surgical management, generally via external or transoral approach. We present the case of a 3-year-old boy with RPA with mediastinal extension who was managed with a unique multidisciplinary surgical approach with otolaryngology and interventional radiology. A transoral approach was utilized to pass a transnasal drain with image guidance into the mediastinal fluid collection. This report reviews the presentation and surgical management of RPA with mediastinal extension and describes a unique minimally invasive approach to drainage.

Complications of peritonsillar abscess

Background

The vast majority of patients with peritonsillar abscess (PTA) recover uneventfully on abscess drainage 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 unclarified 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 findings 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 different 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 complications, 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 findings 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.

Multidisciplinary treatment of deep neck infection associated with descending necrotizing mediastinitis: a single-centre experience

Objective

Deep neck infection (DNI) associated with descending necrotizing mediastinitis (DNM) is a highly lethal condition. This retrospective review was performed to share our experience performing multidisciplinary management of DNI associated with DNM during a 7-year period.

Methods

We reviewed 16 patients who had been surgically treated for DNM at Peking Union Medical College Hospital from April 2010 to July 2017. The clinical outcomes were analysed to determine the most appropriate therapeutic strategy.

Results

Five women and 11 men were included in this study. Their mean age was 54.9 ± 14.3 years. DNM-associated infections most commonly occurred secondary to odontogenic infections (n = 10). Thirteen patients required tracheotomy because of tracheal compression. All patients underwent unilateral or bilateral cervicotomy. Six patients with DNM localized in the upper mediastinal space underwent transcervical mediastinal drainage, while 10 patients with DNM extending to the lower mediastinum were treated by cervicotomy and video-assisted thoracoscopic surgery. Three patients died of multiple organ failure.

Conclusion

Multidisciplinary treatment can achieve favourable outcomes in >80% of patients with DNM. Early diagnosis, proper airway management, and adequate surgical drainage are crucial for reducing mortality in patients with DNM, and minimally invasive procedures also play an important role.

Successful Surgical Treatment for Dysphagia Secondary to Descending Necrotizing Mediastinitis

Descending necrotizing mediastinitis (DNM) is a life-threatening disease with a high fatality rate that occurs as a complication of deep neck abscess. DNM complicated by severe dysphagia during the postoperative period has been previously reported, but there have been no published cases of surgical treatment for severe dysphagia secondary to DNM. A 63-year-old man was diagnosed with a deep neck abscess followed by DNM. The patient had dysphagia after incision and drainage of the abscess and drainage for DNM with video-assisted thoracic surgery (VATS). A comprehensive long-term physiotherapy program with a speech and language therapist did not reduce his dysphagia. Thus, the patient underwent laryngeal elevation and cricopharyngeal myotomy, which enabled oral intake. Surgery should be considered for prolonged severe restriction of laryngeal elevation and esophageal introitus opening that is unresponsive to physiotherapy with a speech and language therapist.

The pathogenic microbial flora and its antibiotic susceptibility pattern in odontogenic infections

Suppurative head and neck infections of odontogenic origin are the most frequent type of head and neck infections. According to the literature, 7-10% of all antibiotics are currently prescribed for their treatment. Since penicillin was invented, the overall antibiotic sensitivity and resistance pattern of the isolated pathogenic microflora has continuously changed. The response of microorganisms to antibiotics and the development of resistance to their action is a purely evolutive process characterized by genetic mutations, acquisition of genetic material or alteration of gene expression and metabolic adaptations. All this makes challenging and difficult the correct choice of empirical antibiotic treatment for head and neck space infections even today. The aim of this paper was to evaluate the literature and to evidence the most frequent locations of odontogenic head and neck infections, the dominant pathogenic microbial flora, the genetic mutations and metabolic changes necessary for bacteria in order to aquire antibiotic resistance and as well its susceptibility and resistance to common antibiotics. We also aimed to highlight the possible changes in bacterial resistance to antibiotics over time, and to assess whether or not there is a need for fundamental changes in the empirical antibiotic treatment of these infections and show which these would be.

Infections of the Neck

Infection of the neck is a relatively common emergency department complaint. If not diagnosed and managed promptly, it may quickly progress to a life-threatening infection. These infections can result in true airway emergencies that may require fiberoptic or surgical airways. This article covers common, as well as rare but emergent, presentations and uses an evidence-based approach to discuss diagnostic and treatment modalities.

Descending necrotizing mediastinitis in a healthy young adult

A 26-year-old man with right lower mandibular and chest pain, fever, and respiratory distress was urgently transported to our hospital. CT images revealed gas collection and an abscess from the neck to the mediastinum with bilateral pleural effusion. Descending necrotizing mediastinitis (DNM) induced by an odontogenic infection of a right mandibular molar abscess was diagnosed. The cervical and mediastinal areas were drained, extensive debridement was performed, necrotic tissue was excised, and broad-spectrum antibiotics were administered immediately. Prompt diagnosis and intensive care were necessary for managing the DNM, and the patient was discharged with no comorbidities.

[Treatment Experience of Continuous Negative Pressure Drainage in the Acute Anterior Mediastinal Infection of Oropharyngeal Origined]

背景与目的

纵隔感染是累及纵隔结缔组织的严重感染，并发症较多且死亡率较高；治疗上应用广谱抗生素及营养支持外，早期充分引流为成功救治的关键；在引流方式上，我们应用持续负压引流技术治疗严重口咽部来源的急性前纵隔感染取得较好效果，在此予以总结分享。

方法

2017年1月-12月我院共收治17例来源于口咽部急性纵隔感染，已形成纵隔脓肿，手术均采用胸骨后对口负压引流方式，即经胸骨上窝及剑突下切口游离胸骨后前纵隔间隙，使之贯通并放置引流装置，缝合封闭创口，持续负压引流，负压采用3 cm-5 cm水柱。

结果

17例患者中，14例患者经持续负压引流引流液清亮感染消退，然后拔除引流管；2例患者感染破溃入右侧胸腔，行闭式引流术导致负压消失，放弃负压引流改用常规引流，引流管液体清亮后拔除引流管；1例患者已经形成纵膈脓肿切开引流时间较晚，并发感染性休克、脓毒血症，最终导致多器官功能衰竭死亡。

结论

严重急性纵隔感染传统的治疗方法是胸骨切开引流，患者创伤大、心理难以承受，且医生工作负担较重；持续负压引流术减轻患者痛苦、能够充分引流纵隔积液，并且避免了敷料反复渗出而需要的换药，对治疗严重急性前纵隔感染是一种有效的方法。但该方法对中、后纵隔引流存在局限性，有待进一步优化。

[Descending necrotizing mediastinitis : Treatment concept with focus on thoracic surgery]

BACKGROUND

Descending necrotizing mediastinitis (DNM) originates from odontogenic or oropharyngeal infections which spread along preformed cervicothoracic spaces into the mediastinum and requires emergency multidisciplinary treatment.

MATERIAL AND METHODS

A total of seven patients were diagnosed with DNM based on typical radiological features in a cervicothoracic computed tomography (CT) scan and subsequently underwent standardized transcervical and open transthoracic radical debridement.

RESULTS

The initially detected polymicrobial spectrum of pathogens was dominated by streptococci followed by enterobacteriae. After calculated antibiotic treatment a shift in the spectrum of pathogens was noted and in particular a mycotic superinfection occurred in 43 % of the cases. Anterolateral thoracotomy was performed for radical removal of tissue necrosis and mediastinothoracic drainage extending to the posterior mediastinum was placed. In selected cases, cervico-mediastino-thoracic tubes were transmediastinally placed by the rendevouz technique either in the previsceral or retrovisceral mediastinal space. Despite predominantly advanced mediastinitis (Endo classification type II B) in this patient cohort, the mortality only reached 14 %.

CONCLUSION

Rapid diagnosis, anatomical knowledge, understanding of the progression of infections as well as critical care, antimicrobial treatment and multidisciplinary radical surgical therapy are paramount for successful treatment of DNM. We favor anterolateral thoracotomy as the standard open transthoracic approach to the mediastinum. Placement of cervico-mediastino-thoracic irrigation drains can help to limit DNM.

European Association for Cardio-Thoracic Surgery expert consensus statement on the prevention and management of mediastinitis

Mediastinitis continues to be an important and life-threatening complication after median sternotomy despite advances in prevention and treatment strategies, with an incidence of 0.25-5%. It can also occur as extension of infection from adjacent structures such as the oesophagus, airways and lungs, or as descending necrotizing infection from the head and neck. In addition, there is a chronic form of 'chronic fibrosing mediastinitis' usually caused by granulomatous infections. In this expert consensus, the evidence for strategies for treatment and prevention of mediatinitis is reviewed in detail aiming at reducing the incidence and optimizing the management of this serious condition.

A Fatal Aortic Arch Rupture Due to Descending Necrotizing Mediastinitis in a 24-year-old Woman

Descending necrotizing mediastinitis (DNM) is a life-threatening disease which often develops from a purulent infection of the oral cavity and is associated with high rates of mortality. Here we report the case of a young patient who died from an aortic arch rupture in context of DNM developed from an odontogenic infection caused by Prevotella buccae. Based on the current knowledge on this very rare vascular complication, we discuss factors that may have contributed to this fatal issue and future issues to optimize care provided to patients.

Descending necrotizing mediastinitis in the elderly patients

Descending Necrotizing Mediastinitis (DNM) is a polymicrobic, dangerous and often fatal process, arising from head or neck infections and spreading along the deep fascial cervical planes, descending into the mediastinum. It can rapidly progress to sepsis and can frequently lead to death. It has a high mortality rate, up to 40% in the different series, as described in the literature. Surgical and therapeutic management has been discussed for long time especially in an elderly patient population. The literature has been reviewed in order to evaluate different pathogenesis and evolution and to recognise a correct therapeutic management.

Descending Necrotizing Mediastinitis Treated with Tooth Extractions following Mediastinal and Cervical Drainage

Descending necrotizing mediastinitis (DNM) is a rare condition in which oropharyngeal infection spreads to the mediastinum via the cervical fascia. Delayed diagnosis and surgery result in a high mortality rate among patients with DNM. We present a case of DNM resulting from odontogenic infection treated successfully with tooth extraction following mediastinal and cervical drainage. A 43-year-old, previously healthy Japanese man was admitted to our hospital for treatment of acute mediastinitis. Computed tomography revealed gas collection around the mid-thoracic esophagus and bilateral pleural effusion. We performed mediastinal drainage via right thoracotomy. Cervicotomy was performed on postoperative day 14 to drain a residual cervical abscess. The patient required the extraction of ten teeth over three procedures to address primary odontogenic infection before his fever resolved on postoperative day 40. Prompt diagnosis, aggressive drainage and removal of the source of infection can improve survival among patients with this life-threatening disease.

Optimal surgical options for descending necrotizing mediastinitis of the anterior mediastinum

The mortality rates from descending necrotizing mediastinitis (DNM) are between 25 and 40 % mainly because of delayed diagnosis and inappropriate surgical treatment. This study was undertaken to examine two surgical options for DNM and determine the optimal surgical option for DNM of the anterior mediastinum. Fifteen cases of DNM of the anterior mediastinum, January 2001 and October 2010, were retrospectively reviewed. Eleven were anterosuperior mediastinitis, with infection located above the tracheal bifurcation and four had infections involving the entire anterior mediastinum. Depending on the location of mediastinitis, open drainage of the submandibular and neck abscesses, in addition to other surgical treatments, was performed. If the infection was anterosuperior, transcervical mediastinal drainage or thoracotomy was performed. If the entire anterior mediastinum was involved, necrotic tissue was removed with thoracoscopic via subxiphoid incision, the bilateral pleurae were opened for drainage, and a tunnel connecting the neck incision and the subxiphoid incision through the whole anterior mediastinum was made for drainage. The anterosuperior mediastinitis cases were treated with either transcervical mediastinal drainage (n = 8) or thoracotomy (n = 3). Patients healed after an average of 24.5 and 20.0 days in the hospital, respectively. For the four other cases, one patient died of septic shock, while the other three patients were healed after and an average of 43.3 days in the hospital. Mortality rate was 6.7 %. The surgical procedure used to treat DNM should be selected according to the location of the infection. DNM involving the anterosuperior mediastinum can be treated by transcervical mediastinal drainage. If anterosuperior mediastinitis spreads to the side of the trachea, open thoracotomy is a suitable therapy. If the entire anterior mediastinum is involved, debridement and drainage of the anterior mediastinum should be performed with a thoracoscope via the subxiphoid incision.

Cervical Necrotizing Fasciitis--The Value of the Laboratory Risk Indicator for Necrotizing Fasciitis Score as an Indicative Parameter

PURPOSE

Cervical necrotizing fasciitis (CNF) is uncommon, difficult to diagnose, and rapidly progressive. The objective of the present study was to determine the predictive value of the laboratory risk indicator for necrotizing fasciitis (LRINEC) score for CNF.

MATERIALS AND METHODS

The LRINEC score for 16 consecutive cases of CNF and 595 cases of severe non-necrotizing neck infections was determined over a 6.5-year period in a single-center retrospective cohort study and case report. CNF was confirmed by histologic examination and operative report documentation.

RESULTS

Using a cutoff score of 6, the LRINEC score had a sensitivity of 0.94 (95% confidence interval [CI] 0.92 to 0.96) and specificity of 0.94 (95% CI 0.70 to 1.00). The positive predictive value was 0.29 (95% CI 0.17 to 0.44), and the negative predictive value was 0.99 (95% CI 0.99 to 1.00).

CONCLUSIONS

The LRINEC score can detect early cases of CNF. Patients with a LRINEC score of ≥6 must be carefully evaluated for the presence of CNF.

Characteristics of pyogenic odontogenic infection in patients attending Mulago Hospital, Uganda: a cross-sectional study

Background

Predisposing factors of pyogenic odontogenic infection include dental caries, pericoronitis, periodontitis, trauma to the dentition and the supporting structures or complications of dental procedures. The infections are usually polymicrobial involving normal endogenous flora. We characterised pyogenic odontogenic infection in patients attending Mulago Hospital, Uganda.

Results

Of the 130 patients, 62 (47.7%) were female. The most frequently involved fascial spaces were: the buccal, 52 (25.4%); submasseteric, 46 (22.4%) and the submandibular space, 36 (17.5%). Dental caries was the most prevalent predisposing factor, particularly of the lower third molar teeth. Viridans Streptococci Group and Staphylococcus aureus were the most frequent bacterial isolates: 23.5% and 19.4%, respectively. All Viridans Streptococci isolates were resistant to penicillin G, sulfamethoxazole/trimethoprim (cotrimoxazole), ampicillin and tetracycline, but susceptible to vancomycin. All Staphylococcus aureus strains were resistant to cotrimoxazole and ampicillin while retaining susceptibility to vancomycin, cefotaxime, linezolid, moxifloxacin and amoxicillin/clavulanate. Thirty five (26.9%) patients were HIV infected and the HIV status did not significantly influence the pattern of odontogenic infection.

Conclusions

Dental caries was the most prevalent predisposing factor for pyogenic odontogenic infection. High prevalence of bacterial resistance to ampicillin and cotrimoxazole suggests the need for regular antibiotic susceptibility tests of isolates and rational use of antibiotics in the management of these infections. Prevention requires strengthening of oral health in the community.

Descending necrotizing mediastinitis with diffuse ST elevation mimicking pericarditis: a case report

BACKGROUND

Descending necrotizing mediastinitis (DNM) is a potentially fatal disease that requires aggressive treatment, including mediastinal exploration. The inflammation associated with DNM may involve the heart, which produces acute changes in the electrocardiogram (ECG). As a result, the ECG may mimic pericarditis, causing some diagnostic confusion.

OBJECTIVES

The objectives of this case report are to describe a case of DNM presenting electrocardiographically with pericarditis, and to discuss how to differentiate between benign viral pericarditis and DNM, and the management of these two diseases.

CASE REPORT

We present the case of a previously healthy 50-year-old man who presented to the Emergency Department for chest pain and presumed pericarditis. The patient presented with ST elevation on multiple leads on ECG, tenderness in the neck, widened mediastinum on the chest radiograph, and nonspecific laboratory test results. Echocardiography revealed normal ventricle function and the presence of mild pericardial effusion. The emergency physician performed contrast-enhanced neck computed tomography (CT) to rule out deep-neck infection. The CT scan showed marginal rim-enhancing abscesses in the retropharyngeal, bilateral submandibular, and anterior visceral spaces with extension into the thoracic cavity. Contrast-enhanced chest CT was performed consecutively. The final diagnosis was deep-neck infection with DNM. The patient underwent mediastinoscopy-assisted drainage and neck fasciotomy twice and received 7 weeks of therapy with intravenous meropenem.

CONCLUSION

The present case highlights the importance of considering a mediastinal cause for acute ECG changes.

Descending necrotizing mediastinitis: 5 years of published data in Japan

Descending necrotizing mediastinitis implies infection originating from the neck, most commonly an oropharyngeal or odontogenic focus, that spreads in the cervical fascial spaces and descends into the mediastinum. Early diagnosis is essential because descending necrotizing mediastinitis can rapidly progress to septic shock and organ failure. A comprehensive review of the current data of descending necrotizing mediastinitis in Japan was carried out using PubMed and ICHUSHI from the last 5 years. The symptoms, origins, comorbid conditions, treatment modalities, complications, and survival rates were analyzed. Tonsillar and pharyngeal origin was more identified compared to odontogenic origin. More than one-third of patients were diabetic and 28% of them were not identified as having any comorbidity. Streptococcus sp. and anaerobes were most isolated, reflecting the microflora of the oral cavity. Of the broad antibiotics, carbapenem was the most used as treatment, and clindamycin was the most co-given. Mediastinal drainage approach varied widely and the optimal approach is controversial. Twenty-one patients were treated with video-assisted thoracic surgical drainage and 15 cases by percutaneous catheter drainage, whereas transcervical approach was applied in 25 patients and thoracotomy was carried out in 21 patients. The overall mortality was 5.6%. Many authors advocated that the most effective management tool is a high degree of clinical suspicion followed by prompt and adequate drainage with intensive care including hemodynamic and nutritional support and repeat computer tomographic monitoring.

Favorable results of early diagnosis by cervicothoracic computed tomography scans for descending necrotizing mediastinitis

OBJECTIVES

We studied results of early diagnosis by cervicothoracic computed tomography and early aggressive surgery for descending necrotizing mediastinitis.

METHODS

Between 1990 and 1999, 5 patients with descending necrotizing mediastinitis were surgically treated in our institute. Computed tomography scans confirmed mediastinitis in all cases, even though chest x-ray films demonstrated a widening mediastial shadow in only 2. Soon after surgical drainage of the deep neck infection and diagnosis of descending necrotizing mediastinitis, all patients underwent surgical mediastinal drainage. Mediastinitis was drained by thoracotomy in 1, managed thoracoscopically in 1 and cervicomediastinally drained in 3.

RESULTS

The outcome was favorable in all patients.

CONCLUSIONS

Early diagnosis by cervicothoracic computed tomography and early aggressive surgery for descending necrotizing mediastinitis are essential to favorable outcome.

Descending mediastinitis managed by sternotomy, taurolidine and delayed closure

Descending necrotizing mediastinitis is a rare complication of upper respiratory infections. A quick diagnosis and prompt and complete surgical drainage is important for a successful outcome. A 74-year-old man with descending necrotizing mediastinitis needed a sternotomy, multiple washouts, and delayed sternal closure.

Descending necrotizing Mediastinitis caused by Kocuria rosea: a case report

BACKGROUND

Kocuria species are gram-positive, non-pathogenic commensals. However, in immunocompromised patients such as transplant recipients, cancer patients, or patients with chronic medical conditions, they can cause opportunistic infections.

CASE PRESENTATION

We report the first case of descending necrotizing mediastinitis in a 58-year-old, relatively healthy woman caused by Kocuria rosea.

CONCLUSION

Descending necrotizing mediastinitis due to Kocuria rosea can be successfully treated with prompt surgical drainage combined with antimicrobial therapy.

Unusual case of exacerbation of sub-acute descending necrotizing mediastinitis

Descending necrotizing mediastinitis is a life-threatening complication of an oropharyngeal infection that requires prompt and aggressive medical and surgical therapy. Herein, we report unusual case of man suffering of sub-acute mediastinal infection due to odontoiatric abscess which exacerbated at 3 months after its first presentation. Chest X-ray and CT scan demonstrated soft-tissue swelling of the neck and encapsulated fluid collections with gas bubbles within anterior mediastinum, especially on the right side. Bilateral anterior neck dissections were performed and blunt dissection, irrigation and debridement were carried out to several centimetres below the sternal manubrium. Then, right standard thoracotomy was performed with debridement of the anterior mediastinum. Four tubes were placed in the mediastinum and pleural cavity on the right side, and two tubes were placed in the left thoracic cavity. Follow-up CT scans of neck and chest showed the resolution of infection.

[Surgical management of descending necrotizing mediastinitis]

INTRODUCTION

Descending necrotizing mediastinitis (DNM) is a serious infection which occurs as a complication of oropharyngeal infection. Its surgical management and the routine transthoracic approach remain controversial. In this article we report our experience in the management of this disease, and review the different surgical approaches that have been reported in the medical literature.

MATERIAL AND METHODS

A retrospective review was made of the clinical records of 29 patients treated between 1988 and 2009. Several demographic variables were analyzed, origin of the initial infection, stage of the disease according to Endo's classification, surgical technique and outcome.

RESULTS

Surgical treatment consisted of both cervical and mediastinal drainage and radical debridement. The mediastinal drainage was made through a transcervical approach in 10 cases and transthoracic in 19, depending on the extent of the mediastinitis. The outcome was satisfactory in 24 patients and 5 died (mortality 17.2%).

CONCLUSIONS

According to our results and the conclusions of the main authors, we recommend a prompt and aggressive surgery with a transthoracic approach in cases of widespread DNM.

Evaluation of recovery in iatrogenic evoked acute mediatinitis

This study attempts to find a prediction method of death risk in patients with acute mediastinitis (AM). There is no such tool described in available literature for this serious disease. The study comprised 37 consecutive cases of iatrogenic AM. General anamnesis and biochemical data were included. Factor analysis was used to extract the risk characteristic for the patients. The most valuable results were obtained for eight parameters, which were selected for further statistical analysis (all collected during a few hours after admission). Three factors reached eigenvalue > 1. Clinical explanations for these combined statistical factors are as follows: Factor 1--proteinic status (serum total protein, albumin, and hemoglobin level), Factor 2--inflammatory status (white blood cells, C-reactive protein, and procalcitonin), and Factor 3--general risk (age and number of coexisting diseases). Threshold values of prediction factors were estimated using statistical analysis (factor analysis, Statgraphics Centurion XVI). The final prediction result for the patients is constructed as simultaneous evaluation of all factor scores. High probability of death should be predicted if factor 1 value decreases with simultaneous increase of factors 2 and 3. The diagnostic power of the proposed method was revealed to be high [sensitivity = 100 %, specificity = 69.2 %]: Factor 1 [SNC = 95.8 %, SPC = 76.9 %]; Factor 2 [SNC = 100 %, SPC = 53.8 %]; and Factor 3 [SNC = 75 %, SPC = 76.9 %]. The described method may turn out to be a valuable prognostic tool for patients with AM.

[A case of descending necrotizing mediastinitis caused by infection with Streptococcus agalactiae in a patient with diabetes mellitus]

We report a case with an atypical presentation of descending necrotizing mediastinitis (DNM). A 47-year-old woman with a medical history of untreated type 2 diabetes mellitus and influenza type A virus infection 2 weeks prior to admission was referred to our hospital complaining of right cervical pain and right upper limb swelling. A chest enhanced computed tomographic (CT) scan showed a ring-enhanced mass-like shadow extending from the right sternomastoid muscle down to the right upper mediastinum, compressing the right subclavicular vein. We diagnosed the patient as having DNM based on a physical examination and the CT findings. Because the abscess extended from deep in the neck to the upper mediastinum and right upper pleural space, emergent abscess debridement and drainage was required. After hospitalization, antibiotics (Ampicillin/Sulbactam 12 g/day) were also administered based on Gram-stain findings from the drainage fluid, which showed Gram-positive cocci resembling a string of beads. A culture of the drainage fluid identified Streptococcus agalactiae. Aggressive abscess drainage and early antibiotic therapy resulted in a favorable response. She was discharged without complications on the 33rd hospital day. DNM is well known as a rare but lethal disease. In this case, the presence of diabetes mellitus and post-influenza infection might have been risk factors for a serious S. agalactiae infection. Early aggressive therapy and adequate drainage are recommended for patients with DNM.

Descending mediastinitis

We studied 13 patients with mediastinal abscesses caused by oropharyngeal infections, who presented between April 2007 and June 2011. All patients were operated on after maxillofacial and ear, nose and throat surgeons had treated the primary source and drained all collections in the neck. Thoracic surgery was performed in the same session. Anterior mediastinal collections were drained via a small mediastinotomy. Posterior collections were approached via a thoracotomy. Chest computed tomography was essential to delineate the extent of disease. A thoracotomy approach was used in 7 patients; 2 of them required an anterior mediastinotomy on the opposite side. The others had an anterior mediastinotomy which was bilateral in 2 cases. After repeat computed tomography, 5 patients were operated on for suspected new loculations; tissue edema had caused false imaging in 3 of them. There was no mortality. Early after eradication of the source and pathways to the mediastinum, gravity drainage of mediastinal abscesses, and good antibiotic cover, with repeat computed tomography after 3 days, was an effective approach in this highly fatal disease.

Clinical features of deep neck infections and predisposing factors for mediastinal extension

BACKGROUND

Deep neck infections (DNI) can originate from infection in the potential spaces and fascial planes of the neck. DNI can be managed without surgery, but there are cases that need surgical treatment, especially in the case of mediastinal involvement. The aim of this study is to identify clinical features of DNI and analyze the predisposing factors for mediastinal extension.

MATERIALS AND METHODS

We reviewed medical records of 56 patients suffering from DNI who underwent cervical drainage only (CD group) and those who underwent cervical drainage combined with mediastinal drainage for descending necrotizing mediastinitis (MD group) from August 2003 to May 2009 and compared the clinical features of each group and the predisposing factors for mediastinal extension.

RESULTS

Forty-four out of the 56 patients underwent cervical drainage only (79%) and 12 patients needed both cervical and mediastinal drainage (21%). There were no differences between the two groups in gender (p=0.28), but the MD group was older than the CD group (CD group, 44.2±23.2 years; MD group, 55.6±12.1 years; p=0.03). The MD group had a higher rate of co-morbidity than the CD group (p=0.04). The CD group involved more than two spaces in 14 cases (32%) and retropharyngeal involvement in 12 cases (27%). The MD group involved more than two spaces in 11 cases (92%) and retropharyngeal involvement in 12 cases (100%). Organism identification took place in 28 cases (64%) of the CD group and 3 cases of (25%) the MD group (p=0.02). The mean hospital stay of the CD group was 21.5±15.9 days and that of the MD group was 41.4±29.4 days (p=0.04).

CONCLUSION

The predisposing factors of mediastinal extension in DNI were older age, involvement of two or more spaces, especially including the retropharyngeal space, and more comorbidities. The MD group had a longer hospital stay, higher mortality, and more failure to identify causative organisms of causative organisms than the CD group.

Proposal for a recovery prediction method for patients affected by acute mediastinitis

BACKGROUND

An attempt to find a prediction method of death risk in patients affected by acute mediastinitis. There is not such a tool described in available literature for that serious disease.

METHODS

The study comprised 44 consecutive cases of acute mediastinitis. General anamnesis and biochemical data were included. Factor analysis was used to extract the risk characteristic for the patients. The most valuable results were obtained for 8 parameters which were selected for further statistical analysis (all collected during few hours after admission). Three factors reached Eigenvalue >1. Clinical explanations of these combined statistical factors are: Factor1 - proteinic status (serum total protein, albumin, and hemoglobin level), Factor2 - inflammatory status (white blood cells, CRP, procalcitonin), and Factor3 - general risk (age, number of coexisting diseases). Threshold values of prediction factors were estimated by means of statistical analysis (factor analysis, Statgraphics Centurion XVI).

RESULTS

The final prediction result for the patients is constructed as simultaneous evaluation of all factor scores. High probability of death should be predicted if factor 1 value decreases with simultaneous increase of factors 2 and 3. The diagnostic power of the proposed method was revealed to be high [sensitivity =90%, specificity =64%], for Factor1 [SNC = 87%, SPC = 79%]; for Factor2 [SNC = 87%, SPC = 50%] and for Factor3 [SNC = 73%, SPC = 71%].

CONCLUSION

The proposed prediction method seems a useful emergency signal during acute mediastinitis control in affected patients.

Descending necrotizing mediastinitis: minimally invasive thoracic surgical treatment

OBJECTIVE

To report a case series of patients with descending necrotizing mediastinitis (DNM) who were treated with minimally invasive thoracic surgery.

METHODS

We report three cases of male patients with DNM who underwent mediastinal debridement by video-assisted thoracic surgery at the Hospital São Paulo, located in the city of São Paulo, Brazil, from admission to the final outcome.

RESULTS

The postoperative evolution was favorable in all three cases. The mean length of hospital stay was 16.7 days.

CONCLUSIONS

We conclude that video-assisted thoracoscopy is an effective technique for mediastinal drainage in the treatment of DNM, with the benefits common to minimally invasive surgery: less postoperative pain, lower production of inflammatory factors, earlier return to activities of daily living, and better aesthetic results.

Successfully treated descending necrotizing mediastinitis through thoracotomy using a pedicled muscular serratus anterior flap

Descending necrotizing mediastinitis (DNM) is rare and aggressive. A 68-year-old female with no medical history, was admitted to our institution for cervical cellulitis. After a conventional medical treatment, multiple abscesses of the upper mediastinum appeared on computed tomography (CT) findings. Although two cervicotomies were performed, a new necrotic abscess appeared in the anterior upper and middle mediastinum. An extensive debridement of cellulitis and abscess extended to the pericardium was made by thoracotomy. Middle mediastinum and pericardium were covered and reconstructed by a right pedicled serratus anterior flap. After radical surgery, follow-up was uneventful. Early extensive and complete debridement of cervical and mediastinal collections and irrigation with broad-spectrum intravenous antibiotics is essential. Combined surgery is the best approach in DNM. The use of a pedicled muscular flap helps control the sepsis. In such cases, serratus anterior flap is a flap of choice because it is reliable and always available even in a skinny patient, contrary to omentum. In this life-threatening disease, an early aggressive combined surgery with debridement of all necrotic tissues extended to the pericardium if necessary associated with a pedicled flap is mandatory.

Update on necrotizing mediastinitis: causes, approaches to management, and outcomes

Descending necrotizing mediastinitis (DNM) is one of the most feared and fatal forms of mediastinitis, occurring as a complication after odontogenic or cervicofascial infections or after cervical trauma. Delayed recognition, underestimation of the extent of disease, and insufficient therapy promote spread of infection. Primary treatment of DNM includes surgical eradication of the pharyngeal or odontogenic infection focus, and a concomitant major drainage applied to the neck and the mediastinum. However, the mortality rate of DNM remains high, even with the routine use of CT scanning, antibiotics, advancements in anesthesia and intensive care, and immediate surgical drainage. The present state of the optimal management of DNM is discussed controversially, in particular the question of whether thoracotomy should be performed routinely or if minimally invasive procedures (eg, video-assisted thoracoscopy) may be introduced. This review reports on the incidence and course of this disease and discusses management approaches to DNM.

Successful management of descending necrotizing mediastinitis

Descending necrotizing mediastinitis is a critical infection and the mortality rate remains high. Early aggressive surgical drainage and antibiotic therapy are essential for treatment. We evaluated the efficiency of transthoracic drainage using a minimally invasive technique in 11 cases of descending necrotizing mediastinitis between May 2002 and March 2008. Weperformed a right-side minithoracotomy with thoracoscopic assistance, and the mediastinum was thoroughly drained. The length of hospitalization ranged from 30 to 117 days. The postoperative course was good in all patients, and the outcome was favorable. All patients were discharged without major complications. We recommend employing a minithoracotomy with thoracoscopic assistance for aggressive treatment of descending necrotizing mediastinitis.

Transcervical drainage for descending necrotizing mediastinitis may be sufficient

OBJECTIVE

Descending necrotizing mediastinitis (DNM) is a serious form of mediastinitis with a high mortality rate. It is caused by the downward spread of an oropharyngeal or cervicofascial infection. The optimal surgical approach for this often fatal disease is controversial. This article describes the authors' experience and characterizes the surgical strategies and treatment outcomes of patients with DNM.

STUDY DESIGN

Case series with chart review.

SETTING

A tertiary referral medical center.

SUBJECTS AND METHODS

This study conducted a retrospective chart review of patients with deep neck infections treated at a medical center from 1994 to 2007 and identified 29 patients with DNM. The clinical characteristics and outcomes were compared between patients treated with transcervical drainage alone (group I) and those with both cervical and thoracic drainage (group II).

RESULTS

There were 20 patients in group I and 9 patients in group II. The overall mortality rate was 10.3%. The mean duration of the hospital stay was 29.3 ± 15.5 days. There was no statistically significant difference in age, sex distribution, or duration from the appearance of symptoms to hospital admission between the 2 groups. The duration of hospital stay, tracheotomy rate, and mortality rate also did not differ significantly between the 2 groups. However, the numbers of surgeries were significantly higher in group II than in group I.

CONCLUSION

Transthoracic mediastinal drainage is not a compulsory therapy, but timely, aggressive, transcervical mediastinal drainage with extensive debridement is very important for a good outcome when treating DNM patients.