Neutrophil extracellular traps, B cells, and type I interferons contribute to immune dysregulation in hidradenitis suppurativa

Hidradenitis suppurativa (HS), also known as acne inversa, is an incapacitating skin disorder of unknown etiology manifested as abscess-like nodules and boils resulting in fistulas and tissue scarring as it progresses. Given that neutrophils are the predominant leukocyte infiltrate in HS lesions, the role of neutrophil extracellular traps (NETs) in the induction of local and systemic immune dysregulation in this disease was examined. Immunofluorescence microscopy was performed in HS lesions and detected the prominent presence of NETs. NET complexes correlated with disease severity, as measured by Hurley staging. Neutrophils from the peripheral blood of patients with HS peripheral also displayed enhanced spontaneous NET formation when compared to healthy control neutrophils. Sera from patients recognized antigens present in NETs and harbored increased antibodies reactive to citrullinated peptides. B cell dysregulation, as evidenced by elevated plasma cells and IgG, was observed in the circulation and skin from patients with HS. Peptidylarginine deiminases (PADs) 1 to 4, enzymes involved in citrullination, were differentially expressed in HS skin, when compared to controls, in association with enhanced tissue citrullination. NETs in HS skin coexisted with plasmacytoid dendritic cells, in association with a type I interferon (IFN) gene signature. Enhanced NET formation and immune responses to neutrophil and NET-related antigens may promote immune dysregulation and contribute to inflammation. This, along with evidence of up-regulation of the type I IFN pathway in HS skin, suggests that the innate immune system may play important pathogenic roles in this disease.

Fusarium Solani Infection Following Burn Injury: A Case Report

Fungal infections are becoming increasingly recognized among burn patients. Infection with Fusarium, a filamentous mold, is rarely encountered and mainly seen in immunocompromised patients. High mortality and morbidity were reported with these virulent infections. We present a rare case of refractory septic shock from upper extremity fungal infection with Fusarium solani in a burn patient. Multiple operative debridements and below elbow amputation caused resolution of septic shock. Closure was achieved with a split thickness skin graft. Aggressive approach should be adopted in managing burn patients with Fusarium infection. Serial debridements and extremity amputation should be considered in attempts to improve survival.

Specimen Collection for Translational Studies in Hidradenitis Suppurativa

Hidradenitis suppurativa (HS) is a chronic inflammatory disorder characterized by painful nodules, sinus tracts, and scars occurring predominantly in intertriginous regions. The prevalence of HS is currently 0.053-4%, with a predominance in African-American women and has been linked to low socioeconomic status. The majority of the reported literature is  retrospective, population based, epidemiologic studies. In this regard, there is a need to establish a repository of biospecimens, which represent appropriate gender and racial demographics amongst HS patients. These efforts will diminish knowledge gaps in understanding the disease pathophysiology. Hence, we sought to outline a step-by-step protocol detailing how we established our HS biobank to facilitate the formation of other HS tissue banks. Equipping researchers with carefully detailed processes for collection of HS specimens would accelerate the accumulation of well-organized human biological material. Over time, the scientific community will have access to a broad range of HS tissue biospecimens, ultimately leading to more rigorous basic and translational research. Moreover, an improved understanding of the pathophysiology is necessary for the discovery of novel therapies for this debilitating disease. We aim to provide high impact translational research methodology for cutaneous biology research and foster multidisciplinary collaboration and advancement of our understanding of cutaneous diseases.

Cognitive Behavioral Treatment for Acute Posttrauma Distress: A Randomized, Controlled Proof-of-Concept Study Among Hospitalized Adults With Burns

OBJECTIVE

(1) To evaluate the feasibility of conducting a randomized controlled trial (RCT) of the Safety, Meaning, Activation and Resilience Training (SMART) intervention vs nondirective supportive psychotherapy (NDSP) in an acutely hospitalized adult survivor of burn injury sample; and (2) to assess the preliminary effect of SMART on acute stress disorder (ASD), posttraumatic stress disorder (PTSD), and major depressive disorder (MDD) symptom reduction as secondary prevention.

DESIGN

Proof-of-concept, parallel group RCT design.

SETTING

Regional burn center.

PARTICIPANTS

Acutely injured, hospitalized adult survivors of burn injury (N=50) were randomly assigned to SMART (n=28) or nondirective supportive psychotherapy (n=22). Due to dropout and missing data, final sample size was 40, SMART (n=21) and nondirective supportive psychotherapy (n=19).

INTERVENTIONS

SMART is a manualized, 4-session cognitive behavioral therapy-based psychological intervention targeting ASD, PTSD, and MDD symptoms. NDSP is a manualized, 4-session protocol.

MAIN OUTCOME MEASURES

Davidson Trauma Scale ([DTS]; diagnostic proxy for ASD and PTSD; clinical cutoff=40, with higher score=higher severity) and the Patient Health Questionnaire-9 ([PHQ-9]; diagnostic proxy for MDD; clinical cutoff=10, with higher score=higher severity) at pretreatment, immediate posttreatment, and 1 month posttreatment.

RESULTS

At baseline, median DTS scores and PHQ-9 scores were above clinical cutoffs and did not differ across groups. At 1 week and 1 month posttreatment, median DTS and PHQ-9 scores were beneath clinical cutoffs in the SMART group; scores remained above clinical cutoffs in the NDSP group at these time points.

CONCLUSIONS

It is feasible to conduct an RCT of SMART in hospitalized adult survivors of burn injury. SMART has the potential to yield clinically significant outcomes. Additional studies are needed to replicate and extend these findings.

Cody

Advances in burn management over the past 2 decades have resulted in improved survival and reduced morbidity. The treatment of a single patient following a 90% total body surface area injury illustrates the intensity of labour and coordinated hospital care required for such catastrophically injured patients. Data were extracted from the medical records and from personal recollections of the individual members of the multidisciplinary team as well as from the patient. The clinical course and management of complications are described chronologically as a series of overlapping phases from admission to discharge.

An Extreme Case of Fordyce Angiokeratoma

Angiokeratomas are benign vascular ectasias that can present with bleeding or cosmetic concerns. We present an extreme case of Fordyce angiokeratoma. Usual treatment modalities, including medical management with analgesics and angiotensin-converting enzyme inhibitors, as well as laser treatments, were not viable options in this unique case. Surgical excision with autografting offered a curative treatment option in this case.

Do questions help? The impact of audience response systems on medical student learning: a randomised controlled trial

BACKGROUND

Audience response systems (ARSs) are electronic devices that allow educators to pose questions during lectures and receive immediate feedback on student knowledge. The current literature on the effectiveness of ARSs is contradictory, and their impact on student learning remains unclear.

OBJECTIVES

This randomised controlled trial was designed to isolate the impact of ARSs on student learning and students' perception of ARSs during a lecture.

METHODS

First-year medical student volunteers at Johns Hopkins were randomly assigned to either (i) watch a recorded lecture on an unfamiliar topic in which three ARS questions were embedded or (ii) watch the same lecture without the ARS questions. Immediately after the lecture on 5 June 2012, and again 2 weeks later, both groups were asked to complete a questionnaire to assess their knowledge of the lecture content and satisfaction with the learning experience.

RESULTS

92 students participated. The mean (95% CI) initial knowledge assessment score was 7.63 (7.17 to 8.09) for the ARS group (N=45) and 6.39 (5.81 to 6.97) for the control group (N=47), p=0.001. Similarly, the second knowledge assessment mean score was 6.95 (6.38 to 7.52) for the ARS group and 5.88 (5.29 to 6.47) for the control group, p=0.001. The ARS group also reported higher levels of engagement and enjoyment.

CONCLUSIONS

Embedding three ARS questions within a 30 min lecture increased students' knowledge immediately after the lecture and 2 weeks later. We hypothesise that this increase was due to forced information retrieval by students during the learning process, a form of the testing effect.

Percutaneous pigtail catheter in the treatment of pneumothorax in major burns: the best alternative? Case report and review of literature

Multiple factors place burn patients at a high risk of pneumothorax development. Currently, no specific recommendations for the management of pneumothorax in large total body surface area (TBSA) burn patients exist. We present a case of a major burn patient who developed pneumothorax after central line insertion. After the traditional large bore (24 Fr) chest tube failed to resolve the pneumothorax, the pneumothorax was ultimately managed by a percutaneous placed pigtail catheter thoracostomy placement and resulted in its complete resolution. We will review the current recommendations of pneumothorax treatment and will highlight on the use of pigtail catheters in pneumothorax management in burn patients.

The totality of burn care

The overall improvement in mortality following severe burns has dramatically increased in the last half century with enhanced methods of resuscitation, treatment of inhalation injury, control of infection, early wound excision and novel methods of skin resurfacing. Although burn care begins at the onset of injury, reconstruction and rehabilitation feature highly throughout the various stages of treatment. Ultimately, we will have achieved little if the patient cannot be integrated back into society. For descriptive purposes burn care has been considered chronologically under the following headings: (1) First Two Minutes (Prehospital Care/First Aid), (2) First Two Hours (Emergency Room care), (3) First two days (resuscitation), (4) First Two Weeks (surgical excision and grafting), (5) First Two Months (rehabilitation and psychology), (6) First Two Years (reconstruction).

Noise levels in a burn intensive care unit

INTRODUCTION

Increased noise levels in hospitals, critical care units, and peri-operative areas have been associated with higher levels of sleep deprivation and patient stress. The World Health Organization (WHO) guidelines stipulate a limit of 35 decibels (dB(A)) equivalent continuous sound level (LEq) during the day and 30 dB(A) LEq at night in patients' rooms. To date, no quantitative studies of noise levels have been performed in burn units. The objective of this study was to quantify noise levels in a burn critical care unit to ascertain compliance with guidelines in order to minimize this potential insult.

METHODS

An A-weighted sound pressure level meter was used to measure the ambient noise levels in a burn intensive care unit. Maximum and minimum sound pressure levels were measured at 30-min intervals on 10 days over a 1 month period. Measurements were obtained during shift changes and random times during the day and night-time. Descriptive statistical analyses were performed, to calculate means and standard deviations. Noise measurements at specified times were compared using analysis of variance (ANOVA).

RESULTS

Mean dB(A) LEq values for shift changes, day, and night-time were 65.9 ± 2.8, 65.7 ± 2.6, and 60.9 ± 5.2 dB(A), respectively. There was no significant difference in dB(A)(max) or dB(A)(min) between shift changes, day or night-time (p>0.05). However, night-time minimum values were consistently lower. There was no significant difference between sound pressure level (SPL) inside and outside patients' rooms (p>0.05) at any time.

CONCLUSIONS

Irrespective of time or location, the mean dB(A) LEq in the burn unit was significantly greater than World Health Organization (WHO), National Institute for Occupational Safety and Health (NIOSH), and the Environmental Protection Agency (EPA) recommendations. Guidelines for decreasing noise exposure are necessary to reduce potential negative effects on patients, visitors, and staff.

From cholera to burns: a role for oral rehydration therapy

According to the practice guidelines of the American Bum Association on burn shock resuscitation, intravenous (i.v.) fluid therapy is the standard of care for the replacement of fluid and electrolyte losses in burn injury of > or = 20% of the total body surface area. However, in mass burn casualties, i.v. fluid resuscitation may be delayed or unavailable. Oral rehydration therapy (ORT), which has been shown to be highly effective in the treatment of dehydration in epidemics of cholera, could be an alternate way to replace fluid losses in burns. A prospective case series of three patients was carried out as an initial step to establish whether oral Ceralyte 90 could replace fluid losses requiring i.v. fluid therapy in thermal injury. The requirement of the continuing i.v. fluid therapy was reduced by an average of 58% in the first 24 hours after the injury (range 37-78%). ORT may be a feasible alternative to i.v. fluid therapy in the resuscitation of burns. It could also potentially save many lives in mass casualty situations or in resource-poor settings where i.v. fluid therapy is not immediately available. Further studies are needed to assess the efficacy of this treatment and to determine whether the present formulations of ORT for cholera need modification.

Current Insights into the role of HIF-1 in cutaneous wound healing

Hypoxia Inducible Factor-1 (HIF-1) is considered the major coordinator of the cellular adaptive response to hypoxia. Over recent years, its activity in the context of wound healing has been the object of increasing investigation. On the molecular level, HIF-1 transcriptional target products have been shown to regulate the process of endothelial cell survival, migration and proliferation (VEGF, ANGPT-1, ANGPT-2, ANGPT-4, FGF-2, PlGF, PDGF-B, RGC-32), vascular smooth muscle cell migration and proliferation (FGF-2, EGF, PDGF, thrombospondin) and mobilization of Circulating Angiogenic Cells to the periphery (SFD-1/CXCR4). Studies on the effect of HIF-1 on the expression and activity of extracellular cell matrix modifying enzymes, such as MMPs and prolidase, have been conducted in the context of tumor angiogenesis and metastasis, and have resulted in controversial findings. A growing body of evidence suggests that HIF-1 also affects reepithelialization of the wound bed, through increasing keratinocyte migration, but decreasing their proliferation. Diminished HIF-1 levels and activity have been documented in conditions of impaired wound healing, such as wound healing in aged and in diabetic mice. The increasing number of studies on the role of HIF-1 in wound healing, apart from answering certain questions, has also raised an equal number, if not more. Clarifying the topics that still remain unclear could introduce a new era of HIF-1 targeted management of a wide range of problematic wounds.

Hypoxia and hypoxia-inducible factor in the burn wound

The importance of hypoxia-inducible factor (HIF) in promoting angiogenesis and vasculogenesis during wound healing has been demonstrated. It is widely accepted that HIF activity can be promoted by many factors, including hypoxia in the wound or cytokines from inflammatory cells infiltrating the wound. However, there has not been a systematic exploration of the relationship between HIF activity and hypoxia in the burn wound. The location of the hypoxic tissue has not been clearly delineated. The time course of the appearance of hypoxia and the increased activity of HIF and appearance of HIF's downstream transcription products has not been described. The aim of this study was to utilize pimonidazole, a specific tissue hypoxia marker, to characterize the spatial and temporal course of hypoxia in a murine burn model and correlate this with the appearance of HIF-1α and its important angiogenic and vasculogenic transcription products vascular endothelial growth factor and SDF-1. Hypoxia was found in the healing margin of burn wounds beginning at 48 hours after burn and peaking at day 3 after burn. On sequential sections of the same tissue block, positive staining of HIF-1α, SDF-1, and vascular endothelial growth factor all occurred at the leading margin of the healing area and peaked at day 3, as did hypoxia. Immunohistochemical analysis was used to explore the characteristics of the hypoxic region of the wound. The localization of hypoxia was found to be related to cell growth and migration, but not to proliferation or inflammatory infiltration.

Alterations in content and localization of defensins in rat ileum and jejunum following ischemia-reperfusion. Specific peptides, in specific places, for specific jobs?

OBJECTIVE

To determine alterations in quantities and distributions of natural antimicrobials following ischemia-reperfusion injury. We hypothesized that these compounds would be upregulated in areas of small intestine where changes in permeability and cellular disruption were likely and where protective mechanisms would be initiated.

METHODS

Rats with ischemia-reperfusion underwent superior mesenteric artery clamping and reperfusion. Shams were subjected to laparotomy but no clamping. Ileum and jejunum were harvested and sectioned, and subjected to fluorescence deconvolution microscopy for determinations of content and localization of rat beta defensins, 1, 2, 3; rat neutrophil protein-1; and cathelicidin LL-37. Modeling was performed to determine cellular location of antimicrobials.

RESULTS

Ischemia-reperfusion increased neutrophil defensin alpha (RNP-1) in jejunum; rat beta defensin 1 was increased 2-fold in ileal mucosa and slightly reduced in jejunal mucosa; rat beta defensin 2 was reduced by ischemia-reperfusion in ileum, but slightly increased in jejunum; rat beta defensin 3 was concentrated in the muscularis externa and myenteric plexus of the jejunum; ischemia-reperfusion did not alter cathelicidin LL-37 content in the small intestine, although a greater concentration was seen in jejunum compared with ileum.

CONCLUSION

Ischemia-reperfusion injury caused changes in antimicrobial content in defined areas, and these different regulations might reflect the specific roles of jejunum versus ileum.

Intensive insulin therapy confers a similar survival benefit in the burn intensive care unit to the surgical intensive care unit

BACKGROUND

In contrast to the benefits of intensive insulin therapy (IIT) in the surgical intensive care unit (SICU), its benefits in the burn ICU (BICU) remain unclear. Furthermore, IIT and tight glycemic control has received little attention in elderly ICU patients.

METHODS

We evaluated the normalization of blood glucose level with IIT in BICU and SICU patients. From October 2006 to July 2007, 970 patients were admitted to our BICU and our SICU. A total of 79 of these patients met criteria for initiation of IIT, 37 of who required IIT for at least 72 hours. Data were analyzed to determine if tight glycemic control (blood glucose < or =150 mg/dL by day 3) is associated with reduced morbidity and mortality.

RESULTS

Tight control was better achieved in SICU patients (45%) than in BICU patients (33%). Daily insulin requirements were approximately 2-fold greater in SICU patients compared with BICU patients (P < .05). Tight control in both SICU and BICU patients was associated with a decreased incidence of sepsis compared with poor glycemic control (10% vs 58% and 60% vs 70%, respectively) and a decreased mortality rate (0 vs 58% and 20% vs 50%; SICU vs BICU, respectively). The percentage of total body surface area burned in BICU patients was 10% and 45% in the < or =150 and >150 mg/dL groups. Mortality rate in the poor control group was >10-fold greater than that of the tight control group; for patients > or =65 years of age, mortality was nearly double than that of patients <65 years of age. The greatest mortality rate (62%) was seen in patients >65 years of age with poor control.

CONCLUSION

Tight control with IIT is associated with an increased survival rate in both BICU and SICU patients. Age is associated with survival, with patients older than 65 years of age having the greatest mortality rate.