Experiencia en loxoscelismo cutáneo y cutáneo visceral de manejo hospitalario: clínica, evolución y propuesta terapéutica / Experience in visceral cutaneous and cutaneous loxoscelism of hospital management: clinical, evolution and therapeutic proposal

Resumen Introducción: El loxoscelismo es una patología frecuente en nuestro medio con un amplio espectro de presentaciones y diagnósticos diferenciales, con complicaciones potencialmente graves, e incluso con riesgo de muerte. A la fecha no existe un tratamiento estándar para estos pacientes. Objetivo: Describir las manifestaciones clínicas, principales complicaciones, manejo terapéutico y evolución de pacientes internados por loxoscelismo en un hospital terciario en Chile. Pacientes y Método: Se analizaron todos los pacientes consultantes e internados por loxoscelismo en el Hospital Clínico de la Pontificia Universidad Católica de Chile entre los años 2014 y 2017, evaluados en interconsulta por Dermatología. Revisión de los registros clínicos incluyendo semiología, imágenes, informes de laboratorio y tratamientos efectuados. Resultados: Se registraron 17 casos de loxoscelismo de manejo hospitalario, cuya presentación responde al patrón epidemiológico nacional. La mayoría de los casos fue manejada con antimicrobianos, corticosteroides sistémicos, antihistamínicos y dapsona. De ellos, 11,8% correspondieron a loxoscelismo cutáneo visceral, manejados exitosamente con medidas de soporte, corticosteroides sistémicos y antihistamínicos. El 59% presentó resolución de las lesiones al mes de tratamiento, con cicatriz residual leve o hiperpigmentación postinflamatoria, sin mortalidad en nuestra serie. Discusión: La mayoría de los casos de loxoscelismo cutáneo presentó excelente respuesta y rápida resolución del cuadro tras el tratamiento asociado de corticosteroides sistémicos, antimicrobianos y dapsona, sugiriendo que el uso de estas terapias podría detener la progresión de la necrosis cutánea y prevenir las complicaciones asociadas al loxoscelismo.

Background: Loxoscelism is a common pathology in our environment with a broad spectrum of differential diagnoses and presentations, with potentially serious complications, even to the point of death. To date, there is no standard treatment for these patients. Aim: To describe the clinical manifestations, main complications, therapeutic management, and evolution of loxoscelism in an inpatient setting from a tertiary hospital in Chile. Methods: All patients consulting and hospitalized in the hospital of the Pontificia Universidad Católica de Chile with diagnosis of loxoscelism between 2014 to 2017 and evaluated by dermatologist were included. Review of clinical files, including symptoms, images, laboratory parameters and treatment. Results: We evaluated seventeen inpatient with loxoscelism, whose presentation responds to the national epidemiological pattern. Most cases were managed with antibiotics, systemic corticosteroids, antihistamines, and dapsone. From these, 11.8% corresponded to viscerocutaneous loxoscelism, successfully managed with supportive measures, systemic corticosteroids and antihistamines. Fifty-nine percent healed their cutaneous lesions after one month of treatment, with slight residual scarring or post inflammatory hyperpigmentation, without associated mortality in our series. Discussion: Most cases of cutaneous loxoscelism presented excellent response and rapid resolution of the disease after combined therapy with systemic corticosteroids, antibiotics and dapsone, suggesting that the use of these therapies could stop the progression of cutaneous necrosis and prevent complications associated with loxoscelism.

Loxoscelismo cutáneo y cutáneovisceral. Reporte de 4 casos / Cutaneus and viscerocutaneous loxoscelism. Repor of 4 cases

La mordedura por araña del género Loxosceles produce dermonecrosis en el sitio de la lesión y complicaciones sistémicas secundarias a reacciones enzimáticas de su veneno, lo que aumenta la tasa de mortalidad. El objetivo es reportar cuatro casos de loxoscelismo atendidos en el hospital General San Juan de Dios, donde los pacientes tuvieron una evolución satisfactoria a pesar de la inexistencia del antiveneno como manejo ideal de la toxicidad (AU)

First report of in vitro selection of RNA aptamers targeted to recombinant Loxosceles laeta spider toxins

BACKGROUND: Loxoscelism is the envenomation caused by the bite of Loxosceles spp. spiders. It entails severe necrotizing skin lesions, sometimes accompanied by systemic reactions and even death. There are no diagnostic means and treatment is mostly palliative. The main toxin, found in several isoforms in the venom, is sphingomyelinase D (SMD), a phospholipase that has been used to generate antibodies intended for medical applications. Nucleic acid aptamers are a promising alternative to antibodies. Aptamers may be isolated from a combinatorial mixture of oligonucleotides by iterative selection of those that bind to the target. In this work, two Loxosceles laeta SMD isoforms, Ll1 and Ll2, were produced in bacteria and used as targets with the aim of identifying RNA aptamers that inhibit sphingomyelinase activity. RESULTS: Six RNA aptamers capable of eliciting partial but statistically significant inhibitions of the sphingomyelinase activity of recombinant SMD-Ll1 and SMD-Ll2 were obtained: four aptamers exert ~17% inhibition of SMD-Ll1, while two aptamers result in ~25% inhibition of SMD-Ll2 and ~18% cross inhibition of SMD-Ll1. CONCLUSIONS: This work is the first attempt to obtain aptamers with therapeutic and diagnostic potential for loxoscelism and provides an initial platform to undertake the development of novel anti Loxoscelesvenom agents.

Scorpion stings in Turkey: epidemiological and clinical aspects between the years 1995 and 2004 / Picadas de escorpião na Turquia: aspectos epidemiológicos e clínicos entre os anos de 1995 e 2004

The most important health-threatening scorpions found in Turkey are; Androctonus crassicauda, Leiurus quinquestriatus, Mesobuthus gibbosus and M. eupeus species, all of which belong to the Buthidae family. The epidemiological and clinical findings of scorpion stings in Turkey were evaluated between the years 1995 and 2004 based on data recorded in the National Poison Information Center (NPIC). A total of 930 cases were recorded. The cases mostly occurred in the month of July. The gender distribution was 50.22 percent female and 45.48 percent male. It was shown that the 20-29 age group presented more scorpion stings. Most of the stings occurred in Central Anatolia and Marmara regions of Turkey. Patients at the hospital showed signs of localized (pain, hyperemia, edema and numbness) and systemic effects (hyperthermia, nausea and vomiting, tachycardia, shivering and lethargy) but no lethality was notified. According to records, 33 percent of the poisoned patients were treated with antivenin in healthcare facilities.

Os mais importantes escorpiões que comprometem a saúde na Turquia são: Androctonus crassicauda, Leiurus quinquestriatus, Mesobuthus gibbosus e M. eupeus, todos eles pertencentes à família Buthidae. Os achados clínicos e epidemiológicos da picada de escorpiões na Turquia foram avaliados no período entre os anos de 1995 a 2004 baseados em dados do Centro Nacional de Informações de Envenenamentos (NPIC). Foram registrados 930 casos que ocorreram principalmente no mês de julho. A distribuição por sexo foi 50,22 por cento femininos e 45,48 por cento masculinos. Demonstrou-se que o grupo etário de 20 a 29 anos apresentou maior número de picadas de escorpião. A maior parte das picadas ocorreu na Anatólia Central e na região de Marmara, na Turquia. Os pacientes hospitalizados mostraram sinais localizados (dor, hiperemia, edema e confusão mental) e sistêmicos (hipertermia, náusea e vômitos, taquicardia, arrepios de frio e letargia), mas não houve notificação de letalidade. De acordo com os prontuários 33 por cento dos pacientes foram tratados com antiveneno nas unidades de saúde.

Escorpionismo por Tityus pusillus Pocock, 1893 (Scorpiones; Buthidae) no Estado de Pernambuco / Scorpionism caused by Tityus pusillus Pocock, 1893 (Scorpiones; Buthidae) in State of Pernambuco

Apresentamos neste trabalho os primeiros relatos de acidente escorpiônico causado pela espécie Tityus pusillus (Buthidae). Os acidentes ocorreram no ambiente doméstico, na área rural situada nas cidades de Paudalho e São Lourenço da Mata, Pernambuco, Brasil. Os dois casos descritos, uma criança e uma mulher grávida, foram classificados como leve e moderado, respectivamente. Os sintomas clínicos apresentados foram distúrbios locais (dor e parestesia) e distúrbios sistêmicos (calafrios, tontura, cefaléia e vômito). Esses registros permitem incluir Tityus pusillus como uma espécie de importância médica no Brasil.

This paper presents the first reports on scorpion accidents caused by Tityus pusillus (Buthidae). The accidents took place within the home environment, in rural areas located in the municipalities of Paudalho and São Lourenço da Mata, Pernambuco, Brazil. The two cases described (a child and a pregnant woman) were classified as mild and moderate, respectively. The clinical symptoms presented were local disorders (pain and paresthesia) and systemic disorders (chills, dizziness, headache and vomiting). These records make it possible to including Tityus pusillus as a species of medical importance in Brazil.

First case of human latrodectism in Venezuela / Primeiro caso de latrodectismo humano na Venezuela

The first case of envenoming by Latrodectus geometricus in Venezuela is described. The accident occurred at the victim’s home, in Aragua de Barcelona, Anzoátegui State. The 31-year-old female victim was bitten twice on the left scapular region, in quick succession (within seconds). She developed a hyperactive state of the central, autonomic and peripheral nervous systems with minor local symptoms.

Descreve-se o primeiro caso de envenenamento por Latrodectus geometricus na Venezuela. O acidente ocorreu na residência, em Aragua de Barcelona, Estado Anzoátegui. A paciente de 31 anos de idade foi picada, consecutivamente duas vezes, em segundos, na região escapular esquerda. Ela desenvolveu um quadro de hiperatividade do sistema nervoso central, autonômico e periférico com escassa sintomatologia local.

Scorpionism due to Tityus neoespartanus (Scorpiones, Buthidae) in Margarita Island, northeastern Venezuela

The first two cases of scorpion envenoming caused by Tityus neoespartanus (Buthidae) are described. The accidents took place within human environments (one inside a home and the other inside a school), in the village of La Sierra, Margarita Island, State of Nueva Esparta, northeastern Venezuela. Both cases were moderately severe and developed pancreatic involvement and electrocardiographic abnormalities. This report allows inclusion of Margarita Island among the endemic areas of scorpionism in Venezuela.

Descrevem se os dois primeiros casos de escorpionismo por Tityus neoespartanus (Scorpiones, Buthidae). Os acidentes ocorreram no ambiente antrópico (um no domicilio e outro na escola) na aldeia de La Sierra, Ilha de Margarita, Estado de Nueva Esparta, nordeste da Venezuela. Os dois acidentes, moderadamente graves, cursaram com acometimento pancreático e alterações eletrocardiografias. Este reporte permite incluir à Ilha de Margarita entre as áreas endêmicas de escorpionismo na Venezuela.

Primeiro registro de escorpionismo causado por Tityus adrianoi Lourenço (Scorpiones: Buthidae) / First record of scorpionism caused by Tityus adrianoi Lourenço (Scorpiones: Buthidae)

Apresentamos três casos de escorpionismo causados por Tityus adrianoi Lourenço ocorridos em Belo Horizonte e Curvelo, Minas Gerais, Brasil. O atendimento aos pacientes ocorreu no mesmo dia do acidente e em todos os casos foi relatada apenas dor local, que variou de leve a intensa, sem complicações posteriores. Os três acidentes foram classificados como leves.

Three cases of scorpionism caused by Tityus adrianoi Lourenço occurring in the cities of Belo Horizonte and Curvelo, Minas Gerais State, Brazil, are presented. The patients were treated on the same day as the accident and in all cases, only local pain was reported, which varied from low to intense, without posterior complications. All three cases were classified as mild.

Efficacy of species specific anti-scorpion venom serum (AScVS) against severe, serious scorpion stings (Mesobuthus tamulus concanesis Pocock)--an experience from rural hospital in western Maharashtra.

BACKGROUND: Death caused by scorpion envenoming is a common event in the tropical and subtropical countries including many regions in India. Severe scorpion envenoming causes an autonomic storm producing multi-system organ-failure (MSOF) and death. OBJECTIVES: To determine the efficacy of Anti-scorpion venom serum (AScVS) in patients stung by scorpions (Mesobuthus tamulus concanesis Pocock--earlier called Buthus tamulus); to compare it with other modalities of therapy and to detect complications, if any, arising out of AScVS treatment. METHODS: Total 48 patients of severe, serious scorpion envenoming syndrome were studied during the period from 1992 to 2002. In 17 patients AScVS was the only mode of treatment. Others had received adjunctive therapy along with AScVS. RESULTS: 47 patients out of 48 scorpion sting victims recovered completely. Recovery period in patients given AScVS (10 hours) was faster than those who received alpha blockers (16-42 hours). No anaphylactic reaction with AScVS was observed. CONCLUSIONS: AScVS is effective and safe method of therapy in severe scorpion envenoming syndrome.

Envenenamiento en niños por mordedura de la araña Latrodectus Mactans (Viuda Negra): características clínicas y tratamiento / Poisoning caused by Latrodectus Mactans (Black Widow) spider bite among children: clinical features and therapy

Introducción: El envenenamiento por mordedura de araña viuda negra es poco frecuente en edades pediátricas sin embargo no está exento de complicaciones y si no se trata a tiempo puede causar la muerte. En México se desconoce el número exacto de estos accidentes. Objetivo: Identificar los signos y síntomas característicos, evolución y tratamiento de los niños atendidos por morderua de araña en el Hospital Infantil del Estado de Sonora, con el propósito de establecer el tratamiento oportuno. Material y Métodos: Se revisaron 43 expedientes de niños hospitalizados por mordedura de araña viuda negra entre 1978-2004, las variables consideradas fueron: edad, género, lugar de origen, sitio del accidente, área corporal afectada, tratamiento previo; grado de envenenamiento por signos y síntomas, tratamiento, evolución clínica. Resultados: Predominó el género masculino 69.7%; sin diferencias entre el número de menores de seis años, escolares y adolescentes. El 44 y 37% de los casos se presentaron en el verano y en horas de la tarde, respectivamente. El 74% de los pacientes tuvieron el contacto con el arácnido dentro del domicilio; las áreas anatómicas más afectadas fueron, miembros superiores y tronco; los signos y síntomas más notables en lactantes y preescolares fueron: irritabilidad, llanto constante, sialorrea, agitación, eritema en área de lesión convulsiones. En escolares y adolescentes fueron los signos y sínotmas dolor en sitio de lesión, dolor abdominal, dolor torácico, ansiedad, espasmos musculares y temblor fino. Los pacientes que recibieron tratamiento con faboterapia específica tuvieron mejor evolución y menor tiempo de hospitalización, cabe señalar que no se presentó mortalidad. Conclusiones: La adecuada identificación de los signos y síntomas ocasionados por la morderura de araña en lactantes y preescolares permite el diagnóstico oportuno y ofrece la mejor alternativa de tratamiento.

INTRODUCTION: Poisoning caused by black widow spider bite, is not commonly observed during childhood, it is not exempt from complications, and must be treated in time or the patient can die. In Mexico we do not have accurate data on the exact number of accidents due to this condition. OBJECTIVE: Identify the signs and characteristic symptoms of children treated at the Children's Hospital from the state of Sonora with the aim of starting early treatment. MATERIAL AND METHODS: We reviewed 43 clinical records of hospitalized patients admitted for black widow spider bite between 1978 - 2004. Demographic variables were: age, gender, place of origin, place where accident took place, treatment given prior to hospital admittance, degree of envenomation measured by signs and symptoms, treatment and clinical evolution. RESULTS: 69.7% of cases were male, we did not find differences in the number of patients between infant, pre-school, elementary school children and teenagers. During summer and afternoon hours we registered 44% and 37% cases respectively; 74% patients were poisoned by the spider at home; the anatomical areas most affected were: arms, hands and thorax. Signs and symptoms in infants were: irritability, constanty cry, sialorrea, agitation erythema on wounded areas and seizures. Among elementary school children and teenagers signs included pain in wounded area, abdominal and thoracic, muscle spasms, fine tremor and residual signs. Patients who received fabotherapic treatment had better evolution and less time of hospitalization. No deaths were reported. CONCLUSIONS: The different signs and symptoms between infants, preschool, elementary school children and teenagers allowed us to clearly identify evenommation and differentiate it form confounding diseases. In our study, specific fabotherapy constituted the best treatment choice.

Clinical and echocardiographic findings in patients with myocardial toxicity due to scorpion sting.

BACKGROUND: Myocardial toxicity following a sting by the Indian red scorpion (Mesobuthus tamulus) is a life-threatening medical emergency. A perusal of the published literature suggests that this problem has seldom been studied systematically. METHODS: We retrospectively studied the clinical presentation and echocardiographic findings in 24 patients (mean [SD] age 23.2 [11.7] years; 19 males) with myocardial toxicity caused by the sting of an Indian red scorpion (Mesobuthus tamulus). They were treated with inotropic support and diuretics depending on the requirement. At admission, oral L-carnitine was administered in a dose of 1980 mg/day in three divided doses till the left ventricular (LV) function normalized. None of the patients received digitalis, prazosin, hydrocortisone or antivenin. RESULTS: Extreme anxiety and severe pain at the site of sting were present in all the patients. Hypotension (n = 19), pulmonary oedema (n= 15) and acute renal failure (n=8) were the other presenting features. Chest X-ray revealed cardiomegaly in 8 and pulmonary oedema in 13 patients. Serum creatinine phosphokinase levels were elevated more than two times the upper limit of normal (200 IU/L) in 22 patients (92%). The mean duration of hospitalization was 5 days (range 3- 11 days). L-carnitine treatment resulted in significant reduction in the LV diameter (mm) in diastole (47.6 [6.2] v. 42 [6.1], p < 0.01) and systole (42 [7.1] v. 28.2 [4], p<0.001); end-diastolic volume (ml) (108.7 [31.9] v. 81 [26.7], p <0.01) and end-systolic volume (ml) (81.3 [30.9] v. 31.1 [10.7], p < 0.001); and significant improvement in the stroke volume (ml) 27.8 [13.2] v. 61.7 [6.2], p<0.001) and ejection fraction (%) (25.5 [12.8] v. 61.2 [6.5], p<0.001). All the patients responded well to treatment and none died. CONCLUSION: Our initial observations suggest a potential benefit with additional oral L-carnitine treatment in patients with myocardial toxicity caused by scorpion sting presenting with hypotension and severe LV dysfunction. These findings merit further study.

Loxoscelismo en pediatría: Región Metropolitana Chile / Loxoscelism in paediatrics: Región Metropolitana Chile

Loxoscelismo es el cuadro tóxico producido por veneno que arañas del género Loxosceles L. Iaeta, en Chile, inyectan en el momento de la mordedura. Puede presentarse en dos formas clínica: loxoscelismo cutáneo-visceral (LCV). El objetivo del presente trabajo es exponer y analizar los aspectos clínico-epidemiológicos de 56 casos pediátrico -38 LC y 18 LCV- atendidos en la Región Metropolitana. En los últimos 45 años se ha encontrado una mayor incidencia de ambas formas en primavera-verano, en dormitorios cuando el niño dormía o se estaba vistiendo, siendo las áreas cutáneas más frecuentemente afectadas las extremidades y cara, con sensación de lancetazo urente como síntoma inicial. Manifestaciones clínicas más frecuentes: dolor, edema y placa livedoide que derivó a escara necrótica. Manifestaciones clínicas del LCV fueron hematuria, hemoglobinuria, ictericia, fiebre y compromiso de conciencia; letalidad 22,2 por ciento. El LCV no tuvo relación con el sitio de mordedura, extensión de la lesión local ni época del año. Si el compromiso visceral no aparece en las primeras 24 h es muy probable que se trate de un LC cuyo pronóstico es bueno. Si el paciente con LCV ha sobrepasado las 48 h, sus posibilidades de recuperación son altas. El tratamiento fue parental: antihistamínicos o corticoides en LC y corticoides en LCV. Conclusiones: En esta serie se observa una predominancia en el sexo femenino, sin diferencias estacionales ni de edad. En su gran mayoría los casos se originaron en el domicilio, afectando en especial las extremidades. El LCV fue más frecuente en mujeres, y sus principales manifestaciones fueron la hematuria y hemoglobinuria, y la precocidad del diagnóstico y su manejo son factores fundamentales en el pronóstico

clinical evaluation of the effectiveness of antivenom in scorpion envenomation

From 1985 to 1991, 950 cases of scorpion stings were admitted and treated with 0 to 1 ampule of scorpion antivenom at King Fahd Hospital, Al Baha. Antivenom policy was changed in mid 1991, therefore, from January, 1992 to December, 1998, 968 admitted cases of scorpion stings were treated with 5 or more ampules of antivenom. All patients with severe envenomation and pulmonary edema were treated in the intensive care unit. The protocol of treatment had remained the same [1985 - 1998], except for prompt high antivenom dosage. The occurrence of pulmonary edema and cardio-pulmonary arrest in the two years preceeding the policy change [1990-1991] was compared with the period when high dose serotherapy was made mandatory [1992-1998]. After the new antivenom dose, mortality rate fell from 16 of 950 [1.7%] to 0 of 968 [p=0.00015]; occurrence of pulmonary edema decreased from 18 of 162 [11.1%] in 1990-1991 to 12 of 968 [1.2%] in 1992-1998 [p<0.001] and cardio-pulmonary arrest from 7.4% to 0.4% [p<0.001]. The last death recorded due to scorpion sting was of a patient in 1991 who had received no antivenom. The excellent outcome is attributed to scorpion antivenom

Prazozin - a first line drug in scorpion envenomation

Scorpion envenomation is an acute life-threatening medical emergency. Prazosin as a first line of drug can easily reverse the alpha receptor stimulation and the resultant autonomic stom witnessed in scorpion envenomation. Here we present a case of a one-and-a-half-years old. Omani girl who presented with multiple scorpion stings and severe envenomation but effectively managed with prazosin and anti-venom without any cardiac and pulmonary problems

Prazosin therapy and scorpion envenomation.

BACKGROUND: 25-30% fatality due to acute pulmonary oedema in victims of Indian red scorpion (Mesobuthus tamulus) sting have been reported from Western Maharashtra, India. The advent of prazosin in recent years has revolutionized the management of severe scorpion sting cases. Majority of cases developed acute pulmonary oedema in 4-8 hours in a hospital setting irrespective of control of their arterial blood pressure with six hourly oral prazosin regimen, these cases recovered with extra dose of prazosin. We developed a standardised protocol for acute phase of treatment of these cases with the aim of preventing the development of pulmonary oedema. METHOD: We compared scorpion sting cases managed by non-protocol conventional (NPC) treatment and those by standardised protocol (SP) that included three hourly dose of oral prazosin. SP group included severe scorpion sting cases admitted to general hospital at Mahad in the year 1998 (Jan.-Dec.). While those admitted in the year 1997 (Jan.-Dec.) before the SP was implicated were the NPC group. FINDING: Characteristics on arrival of severe scorpion sting patients SP (n-17) and NPC (n-15) groups were similar that more case 6 (35%) from SP group had several hypertension on arrival. On arrival two cases from SP group and one from NPC group had pulmonary oedema. 16 (94.11%) patients from SP group recovered uneventfully, compared with 8 (53.33%) in NPC group (p-0.05). 0% Vs 5 (38.46%) developed acute pulmonary oedema (p < 0.0001) from SP and NPC group respectively, three (one had on arrival two patients during hospitalization) from NPC group had massive pulmonary oedema recovered with i.v. nitroprusside drip (SNP). While from SP group one had massive pulmonary oedema on arrival recovered with i.v. SNP, other one had pulmonary oedema recovered with oral prazosin. Cool extremities (vasoconstriction) persisted 11.5 (5-20) VS 18 (12-26) hours in SP and NPC group respectively. INTERPRETATION: Compared with NPC management; development of acute pulmonary oedema prevented by standardised protocol regimen at rural setting.