RESUMO
Tabernaemontana arborea (Apocynaceae) is a Mexican tree species known to contain ibogan type alkaloids. This study aimed at determining central nervous system-related activities of an alkaloid extract obtained from the root bark of T. arborea. A gas chromatography-mass spectrometry (GC-MS) analysis was performed to describe the alkaloid profile of the extract. A wide dosing range (0.1 to 56.2 mg/kg) of this extract was evaluated in different murine models. Electrical brain activity was examined by electroencephalography (EEG). The extract's effects on motor coordination, ambulatory activity, and memory were analyzed based on the rotarod, open field (OFT), and object recognition tests (ORT), respectively. Antidepressant and antinociceptive activities were determined using the forced swimming test (FST) and the formalin assay, respectively. In order to elucidate the underlying mechanisms of action, the 5-HT1A receptor antagonist WAY100635 (1 mg/kg) or the opioid receptor antagonist naloxone (1 mg/kg) was included in the latter experiments. GC-MS analysis (µg/mg extract) confirmed the presence of the monoterpenoid indole alkaloids (MIAs) voacangine (207.00), ibogaine (106.33), vobasine (72.81), coronaridine (30.72), and ibogamine (24.2) as principal constituents of the extract, which exhibited dose- and receptor-dependent antidepressant (0.1 to 1 mg/kg; 5-HT1A) and antinociceptive (30 and 56.2 mg/kg; opioid) effects, without altering motor coordination, ambulatory activity, and memory. EEG indicated CNS depressant activity at high doses (30 and 56.2 mg/kg). The root bark of T. arborea contains a mixture of alkaloids that may hold therapeutic value in pain relief and the treatment of psychiatric diseases without causing neurotoxic activity at effective doses.
Assuntos
Antineoplásicos , Alcaloides de Triptamina e Secologanina , Tabernaemontana , Animais , Camundongos , Tabernaemontana/química , Modelos Animais de Doenças , Estrutura Molecular , Extratos Vegetais/farmacologia , Extratos Vegetais/química , Sistema Nervoso Central , Analgésicos/farmacologia , Transmissão SinápticaRESUMO
BACKGROUND/PURPOSE The International Society of Paediatric Oncology (SIOP) protocol for Wilms tumor (WT) includes preoperative chemotherapy as the initial approach. However, an inadequate treatment may be performed in case of histological misdiagnosis. We evaluated the impact of fine-needle aspiration cytopathology (FNAC) in the diagnosis of unilateral WT in our group of patients. MATERIALS AND METHODS A retrospective descriptive study of patients with diagnosis of unilateral WT who underwent FNAC prior to neoadjuvant chemotherapy between 1993 and 2009 was performed. We reviewed the cytological diagnosis obtained by ultrasound-guided FNAC and the histological correlation with the resected specimens. RESULTS FNAC was performed in 66 patients with unilateral WT. In 57 of the 58 patients with positive FNAC for WT, the final diagnosis was correct (PPV: 98.2%). In 8 cases with negative FNAC for WT, the final diagnosis was positive for WT in 3 patients (NPV: 62.5%). Sensitivity was 95% and specificity was 83.3%. No complications were found associated with the procedure, except for an episode of haematuria, which resolved spontaneously. CONCLUSIONS FNAC is a useful and feasible technique in children that may confirm the suspected diagnosis of unilateral WT, avoiding inadequate preoperative chemotherapy in case of a non-Wilms renal tumor.
Assuntos
Tumor de Wilms/diagnóstico , Biópsia por Agulha Fina , Humanos , Estudos Retrospectivos , Sensibilidade e Especificidade , Tumor de Wilms/patologiaRESUMO
Eight-hundred and nine consecutive admissions have been reexamined by means of analysis of record cards made out at the moment of discharge from the ICU, in which, among other data, the TISS and PSI maximum for the first six hours from admission are included. The results obtained are the following: 50% of the admissions were classified as medium care (PSI < 5, TISS < 20), 28% were grade IV (PSI > 12, TISS > 40), and half were of grade III with a PSI of 9.38 and a TISS of 20.29. The overall mortality was 8.9%. However, the mortality for grades III+IV was 13.4% and gave a good correlation with the PSI, but not with the TISS. The PSI/TISS ratio was 0.45 and the predicted mortality rate according to the PSI was 6.1% for grade III and greater than 12% for grade IV. We conclude the following: (1) Of the illness, 28% were grade IV. (2) We observed a deficient PSI/TISS ratio. (3) The evaluation has to be done by objective means in which the capability of carrying out different methodologies has not been taken into account.
Assuntos
Unidades de Terapia Intensiva Pediátrica/normas , Índice de Gravidade de Doença , Criança , Humanos , Unidades de Terapia Intensiva Pediátrica/estatística & dados numéricos , Tempo de Internação , Mortalidade , Admissão do Paciente , Alta do Paciente , EspanhaRESUMO
Se trataron 55 pacientes portadores de una litiasis renal o ureteral alta con cirugía percutánea. El porcentaje global de éxito fue de 100% con 3,6% de cálculos residuales. Se utilizó anestesia peridural en todos los enfermos. No hubo mortalidad y la morbilidad fue baja. El promedio día de estadía fue de 4,5. Se analiza la relación entre la dilatación pielocalicial, la dificultad de punción y las complicaciones operatorias. También la relación entre el tipo de cálculo y las complicaciones operatorias