Diagnóstico, clasificación y tratamiento de las infecciones en el pie diabético / Diagnosis, classification, and treatment of infections in the diabetic foot

Objetivo: Revisar la literatura para establecer lineamientos y recomendaciones para disminuir la amputación y muerte relacionadas con las infecciones del pie diabético. Sede: Centro de Prevención y Salvamento de Pie Diabético San Elian, Veracruz, Veracruz. Diseño: Revisión de la literatura. Material y Métodos: Se realizó una búsqueda en la literatura para la respuesta adecuada de los siguientes ejes de investigación: clasificación de la infección (cómo se determina la gravedad de la infección); importancia de clasificar (cómo se define una infección grave, qué puntaje tiene la osteomielitis en la gravedad de la infección), y tratamiento (momento óptimo, tratamiento no quirúrgico, uso de antibióticos, cultivos, manejo de osteomielitis y tiempo de tratamiento). Resultados: Las clasificaciones de PEDIS (Perfusión, extensión, profundidad, infección y sensibilidad), IDSA (Infectious Disease Society of America) y San Elian clasifican la gravedad de la infección en leve, moderada y grave. La desbridación quirúrgica de tejido infectado debe realizarse sin diferimiento en forma inicial y subsecuente tantas veces como sea necesario con ''destechamiento'' de trayectos fistulosos. En las infecciones de moderadas a graves se recomienda tratamiento empírico de amplia cobertura (Gram positivos, Gram negativos y anaerobios). El cultivo de la herida antes de iniciar o continuar el tratamiento empírico se hace en infecciones moderadas o graves y se ajusta con el resultado del cultivo si no mejora o empeora la infección. El Staphylococcus aureus se aísla en un 40 y 50 %, con resistencia a la meticilina en un 30 a 40 %. Los antibióticos de elección son la vancomicina, la tigeciclina o el linezolid. La osteomielitis es una infección moderada profunda, caracterizada por descarga purulenta, exposición del hueso, ''dedo en salchicha'', o prueba del estilete positivo. El diagnóstico definitivo se hace con biopsia o resonancia magnética nuclear. La hospitalización está indicada en casos graves en pacientes hemodinámicamente y metabólicamente inestables. Conclusiones: Las infecciones de pie diabético pueden ser de leves a graves y pueden culminar en amputación parcial del pie, de la extremidad o hasta causar la defunción del paciente. Se requiere de una atención sistemática e integral con base en la clasificación y puntaje de San Elian.

Objective: To review the literature to establish guidelines and recommendations to diminish amputation and deaths related to diabetic foot infections. Setting: Centro de Prevención y Salvamento de Pie Diabético San Elian, Veracruz, Veracruz, Mexico. Design: Review of the literature. Material and Methods: We performed a search in the literature to find an adequate answer to the following research questions: classification of the infection (how to determine the severity of the infection), relevance of classifying (how is a severe infection defined, what score can be given to osteomyelitis in the severity of the infection) and treatment (optimal time, non-surgical treatment, antibiotics use, handling of osteomyelitis, and time of treatment). Results: PEDIS (perfusion, extension, depth, infection, and sensitivity), IDSA (Infectious Disease Society of America) and San Elian classify the infection as mild, moderate and severe. Surgical debridement of the infected tissue must be performed without delay initially and subsequently as many times as required with ''unroofing'' of fistulous tracts. In moderate to severe infections an ample coverage (Gram positive and Gram negative and anaerobic bacteria) treatment is recommended. Culturing of the injury before or during empirical treatment is performed for moderate to severe infections and should be adjusted to the result of the culture if the infections does not improve or gets worse. Staphylococcus aureus is isolated 40 to 50%, with resistance to methicillin in 30 to 40%. Choice antibiotics are vancomycin, tigecycline and linezolid. Osteomyelitys is a deep moderate infection, characterized by purulent discharge, bone exposure, ''sausage toe'' or positive probe-to bone test. Definite diagnosis is reached with biopsy or magnetic nuclear resonance. Hospitalization is indicated in severe cases of hemodynamically and metabolically unstable patients. Conclusions: Diabetic foot infections can go from mild to severe and end in partial amputation of the feet, the extremity, or even cause death of the patient. Systematic and integral care based on the San Elian classification and score is required.

Bactibilia e infección del sitio quirúrgico posterior a colecistectomía abierta / Bactibilia and surgical site infection after open cholecystectomy

Introducción: La bactibilia es la presencia de bacterias en bilis vesicular y está relacionada con la aparición de complicaciones sépticas y con el desarrollo de infección en herida quirúrgica de la colecistectomía. En este estudio investigamos si la bactibilia se correlaciona con infección de herida posterior a colecistectomía abierta. Material y métodos: Estudio observacional, descriptivo, de pacientes sometidos, entre enero y diciembre de 2006, a colecistectomía abierta en forma electiva por colecistitis crónica litiásica, a quienes se les realizó cultivo de bilis en el transoperatorio. Se identificaron dos grupos: con cultivo biliar negativo (grupo 1) y con cultivo biliar positivo (grupo 2). Las variables estudiadas fueron edad, sexo, resultados del cultivo, absceso, celulitis, seroma y hematoma. El análisis estadístico incluyó c2 de Pearson o prueba exacta de Fisher y t de Student. Resultados: Se estudiaron 80 pacientes (n = 40 por grupo), 24 hombres (30%) y 56 mujeres (70%), en quienes se practicó colecistectomía abierta y que contaban con cultivo biliar para el análisis. La morbilidad general fue de 42.5%. La tasa de infección del sitio quirúrgico fue de 11.25%. En el grupo 1, dos pacientes presentaron abscesos y dos celulitis; en el grupo 2, cuatro abscesos y uno celulitis. No hubo diferencia significativa al comparar la infección del sitio quirúrgico entre ambos grupos. Conclusiones: La presencia de bacterias en los cultivos de bilis vesicular no se correlacionó con el desarrollo de infección en herida quirúrgica posterior a colecistectomía.

BACKGROUND: Bactibilia is the presence of bacteria in gall bladder bile and may play a role in the appearance of septic complications. It has been related to increased rates of surgical site infection after cholecystectomy. In this study we investigated whether bactibilia correlates with the presence of surgical site infection after cholecystectomy. METHODS: In this observational and descriptive study we investigated those patients operated by open cholecystectomy because of chronic cholecystitis. Patients had bile culture during surgery (January-December 2006). There were two study groups: patients with negative biliary culture (group 1) and patients with positive biliary culture (group 2). Variables were age, gender, biliary culture reports, abscess, cellulitis, seroma, and hematoma. Statistical analysis included Pearson chi(2) or Fisher's exact test. For independent variables, Student t-test was used. RESULTS: Eighty patients were included (n = 40 per group). There were 24 males (30%) and 56 females (70%) who had open cholecystectomy and had biliary culture. General morbidity was 42.50% and surgical site infection rate in general was 11.25%. There were two patients with abscesses and two patients with cellulitis in group 1. There were four patients with abscesses and one patient with cellulitis in group 2. There was no statistically significant difference when comparing surgical site infection in both groups. CONCLUSIONS: The presence of bacteria in gall bladder cultures does not correlate with the development of surgical site infection after open cholecystectomy.

Angiofibrolipoma de omento mayor: informe de un caso y revisión de la literatura / Angiofibrolipoma of the greater omentum: case report and literature review

Introducción: Los tumores sólidos primarios del omento son extremadamente raros. Como tumores benignos del omento se han descrito los lipomas, leiomiomas, fibromas, y neurofibromas, pero no el angiofibrolipoma. Caso clínico: Varón de 39 años de edad, con dolor abdominal de tres días de evolución localizado en cuadrante inferior derecho del abdomen, acompañado de náusea y vómito, así como dolor en fosa iliaca derecha, signo de McBurney, psoas, obturador y Markle positivos. El laboratorio documentó leucocitosis y bandemia; el ultrasonido abdominal, líquido libre en cavidad y masa no bien definida sugestiva de apendicitis aguda complicada; la laparotomía de urgencia, tumoración de omento mayor con zonas de isquemia, necrosis y hemorragia; el examen histológico, angiofibrolipoma de omento mayor. Conclusiones: El angiofibrolipoma del omento mayor se puede presentar como una urgencia quirúrgica debido a la torsión sobre su propio eje. Ante el hallazgo transoperatorio de una tumoración del omento, la escisión completa con omentectomía es el tratamiento de elección, en tanto se recibe el examen histológico definitivo.

BACKGROUND: Primary solid tumors of the greater omentum are extremely rare. Lipomas, leiomyomas, fibromas, and neurofibromas have been described as benign tumors of the greater omentum, but angiofibrolipomas have not. CLINICAL CASE: We present the case of a 39-year-old male with a 3-day evolution of right lower quadrant abdominal pain associated with nausea and vomiting. McBurney, Psoas, Obturator and Markle signs were all positive. Laboratory analysis revealed leukocytosis and bandemia. Abdominal ultrasound showed free fluid and an undefined mass suggestive of complicated acute appendicitis. Emergency midline laparotomy demonstrated a tumor of the greater omentum with areas of ischemia, necrosis and hemorrhage. Histological exam revealed angiofibrolipoma of the greater omentum. CONCLUSIONS: Angiofibrolipoma of the greater omentum may present as a surgical emergency due to torsion. When a tumor of the omentum is found during surgery, complete excision is the treatment of choice when a definitive histology result is received.

Errores en cirugía: estrategias para mejorar la seguridad quirúrgica / Errors in surgery: strategies to improve surgical safety

Surgery is an extreme experience for both patient and surgeon. The patient has to be rescued from something so serious that it may justify the surgeon to violate his/her integrity in order to resolve the problem. Nevertheless, both physician and patient recognize that the procedure has some risks. Medical errors are the 8th cause of death in the U.S., and malpractice can be documented in >50% of the legal prosecutions in Mexico. Of special interest is the specialty of general surgery where legal responsibility can be confirmed in >80% of the cases. Interest in mortality attributed to medical errors has existed since the 19th century; clearly identifying the lack of knowledge, abilities, and poor surgical and diagnostic judgment as the cause of errors. Currently, poor organization, lack of team work, and physician/ patient-related factors are recognized as the cause of medical errors. Human error is unavoidable and health care systems and surgeons should adopt the culture of error analysis openly, inquisitively and permanently. Errors should be regarded as an opportunity to learn that health care should to be patient centered and not surgeon centered. In this review, we analyze the causes of complications and errors that can develop during routine surgery. Additionally, we propose measures that will allow improvements in the safety of surgical patients.

Donador exógeno de óxido nítrico en la respuesta inflamatoria hepática y hemodinámica después de choque hemorrágico / Exogenous nitric oxide donor in the liver inflammatory and hemodynamic response after hemorrhagic shock

BACKGROUND: Hemorrhagic shock (HS) results in oxidative stress to cells and in the induction of the inflammatory response, with an increased expression of a number of proinflammatory mediators and cytokines. We tested the ability of the nitric oxide (NO) donor sodium nitroprusside (NP) to reduce tissue injury in a rodent model of uncontrolled hemorrhagic shock. METHODS: Seventy two Sprague Dawley rats weighing 250-300 g were subjected to a model of uncontrolled hemorrhagic shock. Four groups of animals were included (n = 18 per group): sham/saline, sham/NP, shock/saline, shock/NP. Experimental design consisted of the development of hemorrhagic shock (3 ml/100 g) in a 15-min period, tail amputation (75%) and drug administration at 30 min, fluid resuscitation (FR) with Ringer's lactate (RL) solution to reach a mean arterial pressure (MAP) of 40 mmHg, a hospital phase of 60 min with hemostasis and FR with LR solution to reach a MAP of 70 mmHg, and a 3-day observation phase. Treatment at the beginning of resuscitation included either normal saline (groups 1, 3) or NP (0.5 mg/kg) (groups 2, 4). The following parameters were evaluated: fluid requirements for resuscitation, liver injury tests, liver tissue myeloperoxidase (MPO), liver histology, and 3-day survival. RESULTS: NP significantly reduced fluid requirements for resuscitation (p = 0.0001). We also observed an improved statistically significant difference in tests demonstrating hepatic injury (p = 0.0001), neutrophil infiltration as evidences by liver MPO (p <0.05), and histology studies (p = 0.001). Survival was also increased from 40% in controls to 60% with NP treatment. CONCLUSIONS: These data suggest that excess NO mediates hemorrhage-induced liver injury, and that the suppression of NO with NP may reduce the pathological consequences of severe hemorrhage, possibly by scavenging superoxide (O(2)(-)), thus limiting the production of more aggressive radicals.

Ensayos clínicos sin significado estadístico: la importancia del error tipo II / Clinical trials without statistical significance: importance of type II error

A randomized clinical trial is a prospective experiment to compare one or more interventions against a control group, in order to determine the effectiveness of the interventions. A clinical trial may compare the value of a drug vs. placebo. It may compare surgical with medical interventions. The principles apply to any situation in which the issue of who is exposed to which condition is under the control of the experimenter, and that the method of assignment is through randomization. A negative clinical trial is that in which no significant difference is found between the comparison groups. Results without statistical difference may be useful either to discard useless treatments or to demonstrate that one intervention is as effective as the one it was compared with. Eliminating useless treatments may be adequate. However, if this is the result of studies with methodological errors, new interventions that are actually useful may not be available for patients. In this review we present some of the possible methodological errors that may lead to false negative results in clinical trials.

Niveles séricos de Apo-AI y Apo-B como indicadores de estenosis de injerto sintético después de bypass arterial en enfermedad arterial periférica / Serum levels of Apo-AI and B as markers of synthetic graft stenosis after bypass for peripheral artery disease

BACKGROUND: Hyperlipidemias are the main risk factors for atherosclerosis and cardiovascular disease. Nevertheless, the protein fractions of these lipids such as apolipoprotein B (Apo-B) can lead to arterial obstruction. In this study we investigated levels of apolipoproteins AI and B in patients with chronic occlusive peripheral arterial disease (PAD) of the lower extremities and their association with either patency or stenosis of synthetic grafts. METHODS: This cohort study included 24 patients with chronic occlusive PAD who underwent infrainguinal revascularization with polytetrafluoroethylene (PTFE) synthetic graft. Patients were divided into two groups according to whether or not they were exposed to Apo-B, thus integrating two cohorts: the unexposed group (group 1, normal levels of Apo-B) and the exposed group (group 2, high levels of Apo-B). Variables investigated at 3, 6 and 12 months included arm/ankle index (AAI) and its association with levels of Apo-AI and Apo-B, and levels of cholesterol, triglycerides, and fibrinogen. RESULTS: The study was comprised of 67% men and 33% women. Average age was 65.2 +/- 8.4 years. There was a correlation between AAI and high levels of Apo-B (p <0.001). Apo-AI levels were not significantly different between groups. Fibrinogen remained elevated in both groups with no statistical difference. Triglycerides demonstrated a significant difference between groups in basal measurements (p <0.05). Cholesterol remained normal in both groups without statistical difference. CONCLUSIONS: This study demonstrates that patients exposed to high levels of Apo-B had synthetic graft failure (obstruction), as demonstrated by AAI <1.

Síndrome HELLP ¿evidencias de una posible respuesta inflamatoria sistémica en la preeclampsia? / The HELPP syndrome: evidence of a possible systemic inflammatory response in pre-eclampsia?

INTRODUCTION: The principal causes of morbidity and mortality during pregnancy in Mexico, are preeclampsia/eclampsia, obstetric hemorrhage and puerperium complications; this is, 62 of maternal deaths in last years. HELLP syndrome was observed between 5 to 25 of the mortality in pregnancies of 36 weeks or less. OBJECTIVE: To analyze patients with HELLP syndrome in ICU's (Intensive Care Unit) of a Gynecology and Obstetric Hospital, related to the abnormal hematological, hepatic and renal results with the obstetric case history and the clinical complications. MATERIALS AND METHODS: A transversal study in patients with HELLP syndrome during 1998 and 1999 were carry out. CASE DEFINITION: Peripheral blood with Microangiopathic hemolysis, elevated liver enzymes: AST, ALT over 40 UI/L, even when were LDH lower than 600 UI/L. It was evaluated the hepatic and renal function, platelets count, microangiopathic hemolysis, arterial pressure, seizures, icteric skin color, blindness, visual disturbances, nausea, vomiting and upper quadrant right abdominal pain. In newborn we analyzed gestational age, sex, weight and APGAR. We studied for an association between maternal and biochemical variables with Correlation Pearson Test, and dependence between variables with lineal regression model. RESULTS: 2878 patients with hypertensives disorders in pregnancy (11.64). The 1.15 (n = 33) had HELLP syndrome with specific maternal mortality of 0.4 per 10,000 live birth, perinatal mortality of 1.62 per 10,000 live birth; and renal damage in 84.5. Coefficient beta was higher between number of pregnancies to platelets count (-0.33) and creatinine clearance (-0.401). CONCLUSION: We found an important renal damage, low platelets, elevated liver enzymes in women with two or more pregnancies. Then we propose there are similarities between HELLP syndrome and Systemic Inflammatory Response Syndrome (SIRS) because they could have the same pathophysiology.