COVID-19, pandemia y acúfeno / COVID-19, pandemic and tinnitus

El acúfeno es un síntoma que puede presentarse aislado o en diferentes patologías. Se describe como la percepción de un sonido o percepción auditiva fantasma no producida por una vibración o estímulo acústico externo, que es inaudible para el entorno. La COVID-19 causada por el virus SARS-CoV-2, es una enfermedad que ha mostrado diversidad en su expresión, severidad, síntomas y secuelas. El acúfeno es una condición relacionada con el sistema auditivo que ha sido estudiada durante la pandemia por COVID-19 y se ha podido observar un incremento en la incidencia y/o exacerbación de la percepción de este síntoma, en donde se involucran múltiples factores que se vuelven importantes de considerar.

Tinnitus is a symptom that can occur in isolation or in different pathologies. It is described as the perception of a sound, or as a phantom auditory perception that is not produced by a vibration or external acoustic stimulus, which is inaudible to the environment. COVID-19 caused by the SARS-CoV-2 virus, is a disease that has shown diversity in its expression, severity, symptoms and sequelae. Tinnitus is a condition related to the auditory system that has been studied during the COVID-19 pandemic, and an increase in the incidence and/or exacerbation of the perception of this symptom has been observed, involving multiple factors that become important to consider.

Cell protection induced by beta-sitosterol: inhibition of genotoxic damage, stimulation of lymphocyte production, and determination of its antioxidant capacity.

Beta-sitosterol (BS) is a compound that has shown various activities potentially useful for human health. In the present study, we determined its antigenotoxic capacity and lymphocyte induction potential in mouse as well as its capacity to trap free radicals in vitro. BS, in doses from 200 to 1,000 mg/kg, was able to significantly reduce the frequency of sister chromatid exchanges induced by 10 mg/kg of doxorubicin (DX) in bone marrow cells. The same range of BS doses also gave rise to a strong reduction in the rate of micronucleated, polychromatic erythrocytes induced by DX. In addition, we determined an increase in the production of lymphocytes in mice administered with BS. By means of the DPPH assay, the compound was shown to trap free radicals in a concentration dependent manner as high as 78.12% using 250 mug/ml. Our research established three relevant biological activities of BS which show its potential as a chemopreventive agent.

[Albuminuria and cardiovascular risk: basal results of the KORAL-CARDIO study]. / Albuminuria y riesgo cardiovascular. Estudio KORAL-CARDIO.

BACKGROUND AND OBJECTIVES: Albuminuria is a marker of higher cardiovascular and renal risk in hypertension; it also indicates the need of a tighter control of blood pressure with drugs blocking the renin-angiotensin system. The objective of the KORAL-CARDIO study was to assess the clinical picture and management of patients with hypertension and cardiac disease and albuminuria not previously treated with angiotensin inhibitors. METHODS: A total of 2711 hypertensive patients (44% female) with ischemic or hypertensive cardiopathy or atrial fibrillation and with a positive screening test for albuminuria was included. Type 2 diabetes was also present in 42%. RESULTS: Macroalbuminuria was present in 7.2% of non diabetic and 12.7% of diabetic patients, respectively. Associated complications were: 25% and 35% body mass index over 30 kg/m2; 22% and 39% ischemic heart disease; 4% and 8% stroke; 19% and 22% atrial fibrillation; 42% and 53% high cholesterol levels; 8% and 8% grade 3 hypertension, for non-diabetics and diabetics respectively. Antihypertensive monotherapy was used in 66% of non-diabetics and in 63% of diabetics; only 7% of patients in both groups were treated with triple antihypertensive therapy. CONCLUSIONS: Cardiovascular complications are very frequently associated to albuminuria in patients with hypertension and heart disease not previously treated with angiotensin inhibitors. Blood pressure control was clearly inadequate in this group.

Albuminuria y riesgo cardiovascular. Estudio KORAL-CARDIO / Albuminuria and cardiovascular risk: basal results of the Koral-Cardio study

Introducción y objetivos: La presencia de albuminuria identifica a un grupo dehipertensos con mayor riesgo cardiovascular y renal y obliga a controlar mejor lapresión arterial con fármacos que bloqueen el sistema renina-angiotensina. El objetivodel estudio KORAL-CARDIO fue determinar las características clínicas y demanejo de pacientes con hipertensión, albuminuria y cardiopatía no tratados previamentecon inhibidores angiotensínicos.Pacientes y métodos: Se incluyen prospectivamente 2.711 pacientes (44% mujeres)de 64 años de media con hipertensión arterial, cardiopatía isquémica o hipertensivao fibrilación auricular con positividad en la detección cualitativa de albuminuria.El 42% tenían además diabetes mellitus de tipo 2.Resultados: El 7,2% de los no diabéticos y el 12,7% de los diabéticos teníanmacroalbuminuria; el 25% y el 35% respectivamente tenían índice de masa corporalde más de 30 kg/m2. Las complicaciones asociadas fueron: cardiopatía isquémica(22 y 39%), ictus (4 y 8%), fibrilación auricular (19 y 22%), hipercolesterolemia(42 y 53%), hipertensión de grado 3 (8% en ambos casos). Recibíantratamiento antihipertensivo monofármaco el 66% de los no diabéticos y el 63%de los diabéticos, y sólo el 7% triple terapia; otros tratamientos fueron: hipolipemiantes(41 y 57%) y antiagregantes (37 y 58% respectivamente).Conclusiones: Las complicaciones asociadas a la albuminuria en hipertensos concardiopatías, diabéticos y no diabéticos, no tratados con inhibidores angiotensínicosson muy frecuentes. El grado de control tensional fue escaso en este grupo

Background and objectives: Albuminuria is a marker of higher cardiovascularand renal risk in hypertension; it also indicates the need of a tighter control of blood pressure with drugs blocking the renin-angiotensin system. The objective ofthe KORAL-CARDIO study was to assess the clinical picture and management ofpatients with hypertension and cardiac disease and albuminuria not previously treatedwith angiotensin inhibitors.Methods: A total of 2,711 hypertensive patients (44% female) with ischemic orhypertensive cardiopathy or atrial fibrillation and with a positive screening test foralbuminuria was included. Type 2 diabetes was also present in 42%.Results: Macroalbuminuria was present in 7.2% of non diabetic and 12.7% ofdiabetic patients, respectively. Associated complications were: 25% and 35% bodymass index over 30 kg/m2; 22% and 39% ischemic heart disease; 4% and 8%stroke; 19% and 22% atrial fibrillation; 42% and 53% high cholesterol levels; 8%and 8% grade 3 hypertension, for non-diabetics and diabetics respectively. Antihypertensivemonotherapy was used in 66% of non-diabetics and in 63% of diabetics;only 7% of patients in both groups were treated with triple antihypertensivetherapy.Conclusions: Cardiovascular complications are very frequently associated to albuminuriain patients with hypertension and heart disease not previously treatedwith angiotensin inhibitors. Blood pressure control was clearly inadequate in thisgroup

Pleomorphic xanthoastrocytoma of the cerebellum.

We report a clinicopathologic case of a pure cerebellar pleomorphic xanthoastrocytoma occurring in a 68-year-old male patient. The occurrence of pleomorphic xanthoastrocytoma outside the cerebral hemispheres is exceedingly rare. In the cerebellum only five cases have been reported so far, four of which are composite pleomorphic xanthoastrocytoma-gangliogliomas. This observation reinforces the argument that pleomorphic xanthoastrocytomas should be included in the differential diagnosis of cerebellar neoplasms.

Prevalence and risk of cysticercosis and taeniasis in an urban population of soldiers and their relatives.

To determine markers of Taenia solium transmission and risk factors in an urban community, we studied 1,000 soldiers from a military camp in Mexico City and their relatives. Serum samples were used to detect antigens and antibodies and fecal specimens were examined for Taenia coproantigens and helminth eggs. Prevalences of 12.2% and 5.8% for cysticercosis were found among soldiers and their relatives, respectively. Taeniasis was found in 0.5% and none of the groups, respectively. Relatives of soldiers positive for cysticercosis and taeniasis markers ate more pork from street stores than restaurants or markets compared with relatives of soldiers without these indicators of infection. Also, 12.0% of the relatives of positive soldiers had a history of expelling tapeworm proglottids in the feces in contrast to 3.7% of the family members of the control group. Prevalence values and risk factors in this urban population are similar to those of previous studies performed in rural populations.

Nifurtimox plus pyrimethamine for treatment of murine toxoplasmosis.

In the search for novel antitoxoplasmic agents, we evaluated the efficacy of nifurtimox (3-methyl-4[5'-nitrofurfurylidene-amino]-tetrahydroe-4H-1,4- thiazine-1,1-dioxide), an antiprotozoal drug effective against trypanosomiasis, in an experimental model of acute toxoplasmosis in mice. One hundred NIH mice were inoculated intraperitoneally, each with 2,614 RH tachyzoites of Toxoplasma gondii, and randomly allocated into 5 groups (n = 19-21). Animals from each group were orally treated for 10 days either with nifurtimox 25 mg/kg/day (NF1), nifurtimox 50 mg/kg/day (NF2), pyrimethamine 60 mg/kg/day (P), the combination nifurtimox 50 mg/kg/day plus pyrimethamine 60 mg/kg/day (NF2-P), or with corn oil (controls). Survival of mice was recorded daily for 1 mo after the experimental infection. Comparisons of cumulative mortality between groups were made applying the chi2 test. Mean survival time was longer in animals from P and NF2-P groups than those from NF1, NF2, and control groups. Cumulative mortality was less in mice from the NF2-P group (25%), than that in mice from the P (65%), the NF1 (100%), the NF2 (89%), or the control (95%) groups (P < 0.01). The doses of nifurtimox used in the present study were not significantly effective against murine toxoplasmosis. However, when combined with pyrimethamine, a strong anti-toxoplasma effect was obtained in comparison with survival rates associated with pyrimethamine or nifurtimox alone. It seems feasible that nifurtimox inhibits the replication of T. gondii tachyzoites similar to that of other protozoans, e.g., Trypanosoma and Leishmania. It will be important to determine if the reduction of mortality in mice treated with the nifurtimox-pyrimethamine combination results from summation or from synergism. Further studies on the toxic mechanisms exerted by nifurtimox on T. gondii seem warranted.

Giant osteoblastoma of temporal bone. Case report.

Benign osteoblastoma is an uncommon bone tumor accounting for approximately 1% of all bone tumors. There are only 35 cases of skull osteoblastoma reported in the literature. We describe the case of a 23 year old male with a giant osteoblastoma of temporal bone submitted to a total removal of the tumor after an effective embolization of all external carotid branches. The authors discuss diagnostic and management aspects of this uncommon skull tumor.

Reversible hearing loss from cerebellopontine angle tumors.

We report two patients who presented with a dramatic recovery from severe sensorineural hearing loss after total surgical removal of cerebellopontine angle tumors (meningioma and jugular foramen neurinoma). The factors that differentiate these "non-acoustic tumors" in relation to the prognosis for hearing are discussed. A surgical approach that maintains the labyrinthine structure and preserves the arachnoid membrane of the superior cerebellopontine angle cistern during tumor removal is stressed.

Diffuse cutaneous leishmaniasis in Mexico.

In Mexico, 6 cases of diffuse cutaneous leishmaniasis (DCL) were found in widely separated geographic regions. Information was also available on 2 other cases. In addition to the typical clinical features, half of the patients had evidence of nasopharyngeal mucosal involvement. All isolates from the DCL patients were identified as Leishmania mexicana mexicana by isoenzyme analysis and monoclonal antibody typing. In 1 region of Tabasco state where DCL was found, uncomplicated cutaneous leishmaniasis appeared to be highly endemic, and isolates from a few such patients were identified as L. mexicana mexicana. An incidental finding was the recovery of an isolate of L. braziliensis braziliensis from a patient with chiclero ulcer in Oaxaca state. The clinical and epidemiological significance of the reported cases are discussed.

Comparacion de una tecnica de deteccion de antigenos solubles de Cisticercus cellulosae. / Comparison of a technic to detection of soluble antigens of Cysticercus cellulosae

RESUMEN El estudio de 60 muestras de líquido cefalorraquídeo tomadas al azar provenientes de enfermos de neurocisticercosís, mostró que las pruebas inmunológicas detectan un número importante de casos de esta enfermedad; especialmente si se comparan con las pruebas citoquímicas utilizadas tradicionalmente como auxiliares de diagnóstico. No obstante que la reactividad de la técnica de aglutinación de partículas de látex en este trabajo descendió de 88% a 77%en la detección de antígenos solubles de Cysticercus cellulosae en el líquido cefalorraquídeo. fue superior a la reacción de fijación del complemento que detectó anticuerpos en 60% de los casos. Ambas pruebas se incrementaron 10% en la segunda muestra !o que parece indicar aumento en la concentración de antígenos de C. cellulosae después del tratamiento, así como rápida producción de anticuerpos específicos in su