Metahemoglobinemia y hemólisis intravascular aguda después de una intoxicación por naftaleno en un paciente pediátrico / Methemoglobinemia and acute intravascular hemolysis after naphthalene poisoning in a pediatric patient

La intoxicación por naftaleno es poco frecuente en los niños. Es causada por la ingesta, la inhalación o el contacto con la piel de sustancias que contienen naftaleno. Los pacientes suelen tener orina de color marrón oscuro, diarrea acuosa y vómito bilioso. Los signos incluyen fiebre, taquicardia, hipotensión y valores bajos en la oximetría de pulso, incluso con oxigenoterapia. Los análisis de sangre detectan anemia hemolítica, metahemoglobinemia, insuficiencia renal e hiperbilirrubinemia. Además del tratamiento sintomático, se hacen transfusiones de eritrocitos y se les administran ácido ascórbico, azul de metileno y N-acetilcisteína. En este artículo, presentamos el caso de un paciente masculino de 23 meses de edad con metahemoglobinemia y hemólisis intravascular aguda que recibió atención en la unidad de cuidados intensivos durante cinco días por intoxicación por naftaleno. Si bien la intoxicación por naftaleno es muy poco frecuente, tiene consecuencias mortales y se debe ejercer precaución con su uso y venta.

Poisoning by naphthalene is uncommon in children. It is a type of poisoning brought on by ingesting, inhaling, or coming into touch with naphthalene-containing substances on the skin. Patients typically present with an initial onset of dark brown urine, watery diarrhea, and bile vomit. The signs include fever, tachycardia, hypotension, and low pulse oximetry readings even with oxygen support. Hemolytic anemia, methemoglobinemia, renal failure, and hyperbilirubinemia are all detected in blood tests. Erythrocyte transfusion, ascorbic acid, methylene blue, and N-acetylcysteine (NAC) therapies are provided to inpatients in addition to symptomatic treatment. We present a 23-month-old male patient who developed methemoglobinemia and acute intravascular hemolysis, who was followed up in the intensive care unit for five days due to naphthalene intoxication. Although naphthalene poisoning is very rare, it should be known that it has fatal consequences, and more care should be taken in its use and sale.

Púrpura trombótica trombocitopénica en pediatría. Reporte de un caso / Thrombotic thrombocytopenic purpura in pediatrics. A case report

La púrpura trombótica trombocitopénica es una entidad poco frecuente en pediatría, pero de alta mortalidad sin tratamiento adecuado y oportuno. Se caracteriza por presentar anemia hemolítica microangiopática asociada a signos y síntomas neurológicos, cardíacos, abdominales y menos frecuentemente renales; puede estar acompañada de fiebre. En niños, el diagnóstico se basa en los hallazgos clínicos y de laboratorio. La actividad de ADAMTS13 <10 % apoya, pero no confirma el diagnóstico y, dada la gravedad de la patología, el resultado no debe retrasar el inicio del tratamiento. Se presenta una paciente de 15 años, previamente sana, con signos neurológicos asociados a anemia hemolítica y trombocitopenia. Durante su internación, se arribó al diagnóstico de púrpura trombótica trombocitopénica adquirida.

Thrombotic thrombocytopenic purpura is a rare disease in pediatrics, but it has a high mortality if not managed in an adequate and timely manner. It is characterized by microangiopathic hemolytic anemia associated with neurological, cardiac, abdominal, and less frequently, renal signs and symptoms; it may be accompanied by fever. In children, diagnosis is based on clinical and laboratory findings. ADAMTS13 activity < 10% supports the diagnosis but does not confirm it and, given its severity, the result should not delay treatment initiation. Here we describe the case of a previously healthy 15-year-old female patient with neurological signs associated with hemolytic anemia and thrombocytopenia. During hospitalization, she was diagnosed with acquired thrombotic thrombocytopenic purpura.

Biomarcadores y blancos moleculares del complemento en el diagnóstico de las microangiopatías trombóticas / Complement biomarkers and molecular targets in the diagnosis of thrombotic microangiopathies / Biomarcadores e alvos moleculares do complemento no diagnóstico das microangiopatias trombóticas

Resumen El sistema del complemento juega un papel central en la inmunidad innata, es una línea de defensa contra patógenos y participa en la homeostasis. La activación anormal del complemento contribuye al desarrollo de patologías de variable severidad, tanto inmunológicas y hematológicas como renales. Entre ellas, las microangiopatías trombóticas (MAT) representan un grupo de enfermedades raras con manifestaciones clínicas comunes caracterizadas por anemia hemolítica no inmune, trombocitopenia y daño de órgano(s) blanco. Si bien la clasificación de las MAT sigue siendo desafiante y no ha sido internacionalmente estandarizada, la descripción de entidades asociadas a anomalías del complemento fue comprobada con la eficiencia de la terapia anticomplemento en los pacientes. Las herramientas de diagnóstico desarrolladas en las últimas décadas son esenciales actualmente para diferenciar las MAT más características del grupo; esto es, la púrpura trombótica trombocitopénica (PTT) y el síndrome urémico hemolítico (SUH). En el presente trabajo se presenta una revisión del funcionamiento del sistema del complemento en condiciones fisiológicas, para poder explicar luego cuáles son las alteraciones del sistema implicadas en el desarrollo de las MAT y describir las herramientas disponibles para detectarlas en el laboratorio.

Abstract The complement system plays a crucial role in the innate immune response, being the first-line defense against pathogens and regulating homeostasis. Uncontrolled complement activation can cause immunologic, hematologic as well as renal syndromes of variable severity. Among them, thrombotic microangiopathies (TMA) represent a group of rare diseases characterised by similar clinical manifestations such as microangiopathic hemolytic anemia (MAHA), peripheral thrombocytopenia and organ injury. Although TMA classification is still challenging and no international consensus has been reached, complement-associated disorders have been described thanks to the efficiency of anti-complement therapy in patients. Diagnostic tools developed in the last decades are essential to differentiate the two most well characterized TMA: thrombotic thrombocytopenic purpura (TTP) and hemolytic uremic syndrome (HUS). This review will describe how the complement system works in physiological conditions in order to explain how complement abnormalities are involved in TMA, and finally how to detect those anomalies using laboratory tests.

Resumo O sistema do complemento desempenha um papel central na imunidade inata, sendo uma linha de defesa contra patógenos e participando da homeostase. A ativação anormal do complemento contribui para o desenvolvimento de patologias de gravidade variável, como imunológicas, hematológicas e renais. Entre elas, as microangiopatias trombóticas (MAT) representam um grupo de doenças raras com manifestações clínicas comuns caracterizadas por anemia hemolítica não imune, trombocitopenia e lesão de órgão(s) alvo. Embora a classificação das MAT continue sendo desafiadora e não tenha sido padronizada internacionalmente, a descrição de entidades associadas a anomalias do complemento foi comprovada com a eficiência da terapia anticomplemento nos pacientes. As ferramentas de diagnóstico desenvolvidas nas últimas décadas são atualmente essenciais para diferenciar as MAT mais características do grupo, que são a púrpura trombocitopênica trombótica (PTT) e a síndrome hemolítica urêmica atípica (SHU). Neste trabalho, é apresentada uma revisão do funcionamento do sistema de complemento em condições fisiológicas, a fim de explicar posteriormente quais são as alterações do sistema compreendidas no desenvolvimento das MAT, e descrever as ferramentas disponíveis para detectá-las em laboratório.

Endothelial lesion and complement activation in patients with Scleroderma Renal Crisis / Lesão endotelial e ativação do complemento em pacientes com crise renal esclerodérmica

Abstract In kidney biopsies reviews, scleroderma renal crisis (SRC) is characterized by vascular endothelial injuries, C4d deposits on peritubular vessels, and acute and chronic injuries coexisting on the same biopsy. The clinical signs of thrombotic microangiopathy (TMA) are described in systemic sclerosis (SSc), nevertheless, it has not been related to acute injuries described on kidney biopsies. We report a case of SRC in a patient with scleroderma-dermatomyositis overlap syndrome, which also showed clinical and histopathological data of TMA. On fundus examination, a severe acute hypertensive retinopathy was found. The kidney biopsy showed severe endothelial damage with widening of mucoid cells at the level of the intima, focal concentric proliferation on most small arterioles, and C3, C4d, and IgM deposits along the capillary walls. The genetic study of complement only showed the presence of membrane cofactor protein (MCP) risk haplotypes, without other genetic complement disorders. We understand that in a patient with TMA and SSc, the kidney damage would be fundamentally endothelial and of an acute type; moreover, we would observe clear evidence of complement activation. Once further studies correlate clinical-analytical data with anatomopathological studies, it is likely that we will be forced to redefine the SRC concept, focusing on the relationship between acute endothelial damage and complement activation.

Resumo Nas revisões de biópsias renais, a crise renal esclerodérmica (CRE) é caracterizada por lesões endoteliais vasculares, depósitos de C4d em vasos peritubulares e lesões agudas e crônicas que coexistem na mesma biópsia. Os sinais clínicos de microangiopatia trombótica (MAT) são descritos na esclerose sistêmica (ES); no entanto, não foram relacionados às lesões agudas descritas nas biópsias renais. Relatamos um caso de CRE em um paciente com síndrome de superposição de esclerodermia-dermatomiosite, que também apresentou dados clínicos e histopatológicos de MAT. No exame de fundo do olho, foi encontrada uma retinopatia hipertensiva aguda grave. A biópsia renal mostrou lesão endotelial grave com alargamento das células mucoides ao nível da íntima, proliferação concêntrica focal na maioria das pequenas arteríolas e depósitos de C3, C4d e IgM ao longo das paredes dos capilares. O estudo genético do complemento mostrou apenas a presença de haplótipos de risco da proteína cofator de membrana (PCM), sem outros distúrbios genéticos do complemento. Entendemos que em um paciente com MAT e ES, o dano renal seria fundamentalmente endotelial e do tipo agudo; além disso, observaríamos evidências claras de ativação do complemento. Uma vez que novos estudos correlacionam dados clínico-analíticos com estudos anatomopatológicos, é provável que sejamos forçados a redefinir o conceito de CRE, enfocando a relação entre dano endotelial agudo e ativação do complemento.

Associação entre eliptocitose e esferocitose hereditária em um idoso. Relato de caso / Association between elliptocytosis and hereditary spherocytosis in an elderly patient. Case report

A anemia é muito prevalente em idosos; todavia, a eliptocitose hereditária, uma anemia hereditária caracterizada pela presença de eritrócitos em forma elíptica no sangue periférico; raramente causa anemia sintomática em pacientes idosos. A eliptocitose esferocítica é uma anemia hereditária com caráter autossômico dominante. A associação entre essas duas eritroenzimopatias hereditárias é rara e seu curso varia com alterações da forma eritrocitária, observando-se a presença simultânea de eliptocitose e esferocitose no sangue periférico. A hemólise pode variar de média a moderada intensidade. Relatamos o caso de uma paciente adulta idosa com eliptocitose esferocítica revelada após 26 anos, sendo realizada a esplenectomia para resolução do quadro de hemólise.

Anemia is very prevalent in the elderly; however, hereditary elliptocytosis, an inherited anemia characterized by the presence of elliptical erythrocytes in the peripheral blood; rarely causes symptomatic anemia in elderly patients. Spherocytic elliptocytosis is an inherited anemia with an autosomal dominant character. The association between these two hereditary erythroenzyopathies is rare and its course varies with alterations of the erythrocyte form, observing the simultaneous presence of elliptocytosis and spherocytosis in the peripheral blood. Hemolysis can range from medium to moderate intensity. We report the case of a patient with spherocytic elliptocytosis revealed after 26 years, and splenectomy was performed to resolve the hemolysis.

Hemoglobinas inestables / Unstable hemoglobins / Hemoglobinas instáveis

Las variantes estructurales de hemoglobina son, en su mayoría, el resultado de sustituciones puntuales de aminoácidos en una de las cadenas de globina. En muchos casos, estas hemoglobinopatías son inocuas, mientras que en otros determinan alteraciones en la estabilidad y función de la hemoglobina, ocasionando manifestaciones clínicas de severidad variable. En las hemoglobinas inestables, las alteraciones disminuyen la solubilidad, y así facilitan la formación de complejos de hemoglobina precipitada y desnaturalizada (Cuerpos de Heinz) que ocasionan el daño de la membrana y finalmente la destrucción prematura de los eritrocitos. Representan una rara etiología de anemia hemolítica congénita. Hasta la actualidad se han descrito alrededor de 150 hemoglobinas inestables diferentes, la mayoría de las cuales ocasionan hemólisis crónica, exacerbada por infecciones o la ingesta de medicamentos. Su diagnóstico puede ser difícil, sobre todo en pacientes no esplenectomizados. Su identificación requiere inicialmente de la sospecha clínica, pero dado que las pruebas básicas de laboratorio pueden no ser concluyentes e inducir un diagnóstico erróneo, el estudio molecular será necesario para la confirmación.

The structural hemoglobin variants mostly result from single amino-acid substitutions in globin chains. In many cases these are innocuous, but in others they may alter the stability or functional properties of hemoglobin, leading to clinical manifestations of variable severity. They represent a rare cause of congenital hemolytic anemia. Unstable hemoglobins cause alterations that reduce solubility, with increased tendency to Heinz Body formation, damaging red blood cell membrane and finally the premature destruction of red blood cells. Up to 150 unstable hemoglobins have been described; most of them cause chronic hemolytic anemia, aggravated by infections and or drugs. Diagnosis can be difficult, especially in non-splenectomized patients. Initially, identification requires a high degree of clinical suspicion, but due to the fact that basic laboratory tests might be inconclusive, molecular analysis is necessary for final confirmation.

As variantes estruturais de hemoglobina são, em sua maioria, o resultado de substituições pontuais de aminoácidos numa das cadeias de globina. Em muitos casos, estas hemoglobinopatias são inócuas, ao passo que em outros determinam alterações na estabilidade e função da hemoglobina, produzindo manifestações clínicas de severidade variável. Nas hemoglobinas instáveis, as alterações diminuem a solubilidade, facilitando a formação de complexos de hemoglobina precipitada e desnaturalizada (Corpos de Heinz) que ocasionam o dano da membrana e finalmente a destruição prematura dos eritrócitos. Representam uma rara etiologia de anemia hemolítica congênita. Até a atualidade foram descritas aproximadamente 150 hemoglobinas instáveis diferentes, a maioria das quais produzem hemólise crônica, exacerbada por infecções ou pela ingestão de medicamentos. Seu diagnóstico pode ser difícil, principalmente em pacientes não esplenectomizados. Sua identificação requer inicialmente da suspeita clínica, mas devido a que as provas básicas de laboratório podem não ser concluintes e induzir um diagnóstico errado, o estudo molecular será necessário para a confirmação.

High Prevalence of ITPA Alleles Associated with Ribavirin-Induced Hemolytic Anemia Among Mexican Population

ABSTRACT Background. The prevalence of two functional polymorphisms (rs1127354 and rs7270101) of the inosine triphosphatase (ITPA) gene associated with ribavirin-induced hemolytic anemia (RIHA) during antiviral therapy for hepatitis C virus (HCV) infection varies by ethnicity. In Mexico, the distribution of these polymorphisms among Native Amerindians (NA) and admixed population (Mestizos) is unknown. This study aimed to determine the prevalence of the ITPA polymorphisms among healthy NA and Mestizos, as well as in HCV patients from West Mexico. Material and methods. In a cross-sectional study, 600 unrelated subjects (322 Mestizos, 100 NA, and 178 treatment-naïve, HCV-infected Mestizos patients) were enrolled. A medical history was registered. ITPA genotype was determined by Real-Time PCR. Fst-values and genetic relatedness between study and reference populations were assessed. Results. The frequency of the risk genotypes rs1127354CC and rs7270101AA was higher among NA (98-100%) than in Mestizos (87-92.9%), (p < 0.05). The NA presented the highest prevalence of the rs1127354CC genotype reported worldwide. The Fst-values revealed a genetic relatedness among Mexican NA, South Americans and African populations (p > 0.05). The frequency of the predicted risk for RIHA was higher among NA (98%) than in Mestizos (80.5%) and HCV-infected patients (81.5%) (p < 0 .01). The CC/AA alleles were associated with lower values of total bilirubin, aspartate/alanine aminotransferases, and aspartate-to-platelet-ratio-index score among HCV-patients. Conclusion. A high prevalence of the ITPA polymorphisms associated with RIHA was found in Mexican NA. These polymorphisms could be a useful tool for evaluating potential adverse effects and the risk or benefit of antiviral therapy in Mexicans and other admixed populations.

What caused hemolytic anemia and colicky abdominal pain? Lead!

No abstract available.

Hemolytic Anemia Case Caused by an Inverted Inner Felt after Bentall Operation

A 26-yr-old male patient reported worsened dyspnea, dizziness one year after an emergency Bentall operation for type A aortic dissection. There was evidence of hemolytic anemia and aortogram revealed a significant stenosis at the distal anastomosis site. During the reoperation, we found the inner felt at the distal anastomosis was inverted causing a significant stenosis. The reoperation successfully resolved this problem. Here, we report a rare case of hemolytic anemia caused by an inverted inner felt after Bentall operation.

Eliptocitose hereditária diagnosticada em paciente idosa: relato de caso / Hereditary elliptocytosis diagnosed in elderly patient: case report

JUSTIFICATIVA E OBJETIVOS: A anemia é extremamente prevalente na população idosa, implicando na necessidadede uma investigação aprofundada, com o intuito de se obter melhora na qualidade de vida desses pacientes. A eliptocitose hereditária, que é caracterizada pela presença de eritrócitos em forma elíptica no sangue periférico, raramente é determinante de anemia sintomática em idosos. O objetivo deste estudo foi relatar um caso de eliptocitose hereditária como causa de anemia sintomática em paciente idosa e discutir seus aspectos clínicos, evolutivos, diagnósticos e terapêuticos, ressaltando a importância da avaliação criteriosa de alterações clínicas sugestivas de anemia em idosos. RELATO DO CASO: Paciente do sexo feminino, 67 anos, que se apresentou com anemia hemolítica (hemoglobina reduzida e reticulocitose) sintomática (dores nas pernas, astenia e fadiga) e diagnosticada com eliptocitose hereditária através da visualização de 40% de eliptócitos na análise do esfregaço de sangue periférico, após vários anos de evolução clínica. Recebeu ácido fólico apresentando melhora clínica e dos valores hematimétricos. CONCLUSÃO: Embora a eliptocitose hereditária seja rara, deve fazer parte dos diagnósticos diferenciais de anemia sintomática em idosos, principalmente na vigência de sinais de hemólise (reticulócitos aumentados). A análise do esfregaço sanguíneo na busca de eliptócitos é essencial para a confirmação diagnóstica.

BACKGROUND AND OBJECTIVES: Anemia is a common condition in the older population, implying the need for a thorough investigation in order to achieve improved quality of life for these patients. Hereditary elliptocytosis, characterized by the presence of elliptically red cells on peripheral blood smear, has been rarely described as a determinant of symptomatic anemia in the elderly. The aim of this study was to report a case of hereditary elliptocytosis as a cause of symptomatic hemolytic anemia in an elderly patient and to discuss its clinical, evolutionary, diagnostic, and therapeutic aspects, emphasizing the importance of a careful assessment of clinical alterations suggestive of anemia in older persons. CASE REPORT: A female patient, 67 years old, who presented with symptomatic (leg pain, weakness and fatigue) hemolytic anemia (reduced hemoglobin and reticulocytosis) was diagnosed with hereditary elliptocytosis by visualization of 40% of elliptical erythrocytes in the analysis of peripheral blood smear, after several years of clinical evolution. She was given folic acid, presenting clinical and hematological values improvement. CONCLUSION: Although the hereditary elliptocytosis is rare, it should be part of the differential diagnosis of symptomatic anemia in older persons, especially in the presence of hemolytic signs (increased reticulocytes). Analysis of peripheral blood smear for search for elliptocytes is essential for diagnosis.

Anemia hemolítica grave causada por hemoglobina Southampton: Presentación de caso clínico / Severe hemolytic anemia due to hemoglobin Southampton: Case report

Las hemoglobinopatías estructurales son variantes de la hemoglobina caracterizadas por la síntesis de una molécula cualitativamente diferente de la normal. La mayoría son inocuas, mientras que otras ocasionan cambios fisicoquímicos que determinan manifestaciones clínicas de gravedad variable. En el caso de las hemoglobinas inestables, las alteraciones reducen la solubilidad y facilitan la formación de complejos de hemoglobina desnaturalizada (cuerpos de Heinz) que precipitan, lo cual daña la membrana y destruye prematuramente al eritrocito. Hasta la actualidad se han descrito 142 hemoglobinas inestables, muchas de ellas ocasionan hemólisis crónica, que puede exacerbarse por infecciones o por la ingesta de medicamentos o drogas oxidantes. La hemoglobina Southampton (también conocida como hemoglobina Casper) es una variante inestable que resulta de la sustitución de un residuo de leucina por uno de prolina, en el codón ß106 (CTG ?CCG, como consecuencia de la mutación c.320 T>C. Presentamos una niña con anemia hemolítica grave, esplenomegalia y requerimiento transfusional debidos a hemoglobina Southampton.

Variant hemoglobins are the result of different types of mutations that occur in the globin genes. In many cases, these hemoglobinopathies are harmless, while in others they determine alterations in the physical and chemical properties raising clinical manifestations of variable severity. In the unstable hemoglobinopathies, the changes reduce solubility, inducing the formation of precipitates of denaturated hemoglobin (Heinz bodies), which damage the membrane and finally destroy the red blood cells prematurely. Up to now, more than 142 different unstable hemoglobins have been described, most of them cause chronic hemolysis, increased by infections or drugs. We report the clinical presentation of an unstable hemoglobin (hemoglobin Southampton) in a girl with severe hemolytic anemia, splenomegaly and red blood cell requirement.

Enfermedad por hemoglobina H: primer caso de la variante de hemoglobina H tipo, menos alfa elevado a potencia 3.7 / SEA, en Costa Rica / Hemoglobin H disease: first case of hemoglobin H variant type (-a 3.7 / SEA) in Costa Rica

La enfermedad por Hemoglobina H es la forma más común de talasemia intermedia y posee muchas características que requieren cuidadosa consideración en su manejo clínico. En lamayoría de los casos, la enfermedad por Hemoglobina H resulta de un estado doble heterocigoto producido por unadeleción tipo α0 que remueve ambos genes de α-globina en uno de los cromosoma 16 y de una deleción tipo α+ en uno de los genes de α-globina en el otro cromosoma 16, resultando enuna condición tipo (--/-α). El exceso de cadenas β de globina precipita y forma una hemoglobina anormal característica; la hemoglobina H (Hb H), un tetrámero de β globina (β4). Lospacientes con hemoglobina H que se encuentran en estado compensado pueden tener niveles de hemoglobina entre 9 y 10 g/dL, sin embargo durante las crisis hemolíticas, que se desarrollan durante o después de infecciones agudas con fiebres altas, la hemoglobina puede llegar a disminuirsignificativamente y los pacientes pueden desarrollar shock y fallo renal. Aún cuando la esplenectomía eleva la hemoglobina significativamente, no se recomienda porque la mayoría delos pacientes tienen un nivel aceptable de hemoglobina mientras se encuentren compensados. Se presenta el primercaso descrito en Costa Rica de enfermedad por hemoglobina H variante del sudeste asiático (-α3.7/ --SEA).

Hemoglobin H (Hb H) disease is the most common form of thalassemia intermedia and has many features that require careful consideration in its management. In the majority of cases, the disease results from double heterozygosity for α0- thalassemia due to deletions that remove both linked α-globin genes on one chromosome 16, and deletional α+ from single α-globin gene deletions on the other chromosome 16 resulting in a (--/-α) condition. The excess β globin chainprecipitates and forms a characteristic abnormal hemoglobin: hemoglobin H a β globin tetramer (β4). In a steady state,patients with Hb H disease have hemoglobin levels around 9 to 10 g/dL however, during a hemolytic crisis, which frequently occur in or after acute infections causing high fever, the hemoglobin may drop significantly and the patients can develop shock or renal shutdown. Even though splenectomy leads to significant elevation of hemoglobin levels, it is not recommended because the majority of patients do well with said steady-state hemoglobin levels. We present here the first case of hemoglobin H (-α3.7/ --SEA) southeast Asia variant described in Costa Rica.

Primer caso de hemoglobina Koln (codon98 GTC mayor ATG) en Costa Rica / First case of hemoglobin Koln (codon98 GTC mayor ATG) in Costa Rica

La exposición a ciertos medicamentos puede provocar anemia hemolítica con presencia de cuerpos de Heinz en sangre periférica. Esta anemia puede presentarse por sobredosis de medicamentos, tanto en individuos sanos como en personas con deficiencias enzimáticas como la glucosa-6-fosfato deshidrogenasa, o en presencia de hemoglobinas inestables. Este reporte muestra un caso de anemia hemolítica con cuerpos de Heinz, debido a la presencia de una hemoglobina inestable, cuyos estudios moleculares y HPLC confirmaron el primer caso descrito de hemoglobina Koln (Val98Met) en Costa Rica.

Exposure to certain drugs may result in hemolytic anemia with the appearance of Heinz-bodies in red blood cells. Thistype of hemolytic anemia may occur by simple drug overdosage in absence of any known abnormality, such as innormal persons or in patients with erithroid enzyme defects (e.g. G6PD deficiency) or unstable hemoglobins.1 The present report shows a Heinz-body hemolytic anemia because of an abnormal hemoglobin. High pressure liquid chromatography (HPLC) and molecular analysis confirmed the first case of Hemoglobin Köln in Costa Rica.

Evaluation of serum transferrin receptor and sTfR ferritin indices in diagnosing and differentiating iron deficiency anemia from anemia of chronic disease.

Objective. The present study was conducted to assess the utility of serum transferrin receptor (sTfR) and sTfR ferritin indices to differentiate ACD from IDA and also to diagnose coexisting IDA and ACD. Methods. The study group comprised of 30 IDA patients, 30 cases of ACD and 30 age and sex matched controls. Complete hemogram with peripheral smear examination, markers of ACD, iron profile including serum ferritin and serum transferrin receptor levels were done in all patients and controls. Serum TfR and ferritin indices were calculated. Results. sTfR levels were significantly higher in the IDA group compared to ACD group (p<0.001). ACD group was further subdivided into two groups on the basis of sTfR levels (B1<3 μg/ml and B2 ≥ μg/ml), suggesting coexisting IDA in group B2. sTfR/log ferritin index was > 1.5 in all cases of IDA and ACD with coexisting IDA while all pure ACD cases and control subjects had sTfR/log ferritin index < 1.5. All case in IDA group had log sTfR/serum ferritin index > 2.55 and all patients with ACD with or without associated iron deficiency had log sTfR/serum ferritin ratio < 2.55. Conclusion. The sTfR levels along with the above mentioned indices can be very useful in differentiating pure IDA, ACD and ACD with coexisting iron deficiency, thus providing a noninvasive alternative to bone marrow iron.