Continuous glucose monitoring system: dawn period calibration does not change accuracy of the method.

INTRODUCTION: Continuous glucose monitoring system is a valuable instrument to measure glycemic control, which uses a retrospective calibration based upon 3 to 4 capillary glucose meter values inserted by the patient each day. OBJECTIVE: We evaluated the interference of calibration during the dawn period in the system accuracy. METHODS: The monitoring data were retrospectively divided into two groups: with (Group A) or without (Group B) the dawn period calibration (between 1:00 and 5:00 AM). Accuracy of the method was expressed by relative absolute difference. RESULTS: Thirty-four continuous glucose monitoring data were evaluated comprising a total of 112 nights. A total of 289 paired readings were analyzed - 195 in Group A and 94 in Group B. We did not find a difference in relative absolute difference (RAD%) in any analyzed period of day by adding dawn calibration. CONCLUSIONS: These data suggest that dawn calibration does not alter accuracy of method.

Continuous glucose monitoring system: dawn period calibration does not change accuracy of the method / Sistema de monitorização contínua de glicose: calibração da madrugada não interfere na acurácia do método

INTRODUCTION: Continuous glucose monitoring system is a valuable instrument to measure glycemic control, which uses a retrospective calibration based upon 3 to 4 capillary glucose meter values inserted by the patient each day. OBJECTIVE: We evaluated the interference of calibration during the dawn period in the system accuracy. METHODS: The monitoring data were retrospectively divided into two groups: with (Group A) or without (Group B) the dawn period calibration (between 1:00 and 5:00 AM). Accuracy of the method was expressed by relative absolute difference. RESULTS: Thirty-four continuous glucose monitoring data were evaluated comprising a total of 112 nights. A total of 289 paired readings were analyzed - 195 in Group A and 94 in Group B. We did not find a difference in relative absolute difference (RAD%) in any analyzed period of day by adding dawn calibration. CONCLUSIONS: These data suggest that dawn calibration does not alter accuracy of method.

INTRODUÇÃO: O CGMS (sigla do inglês continuous glucose monitoring system) é um instrumento valioso no controle glicêmico e utiliza uma calibração por meio de 3 ou 4 medidas de glicemia capilar inseridas pelo paciente em cada dia do exame. OBJETIVO: Avaliar a interferência da calibração durante a madrugada na acurácia do sistema. MÉTODOS: Os dados das monitorizações foram divididos retrospectivamente em dois grupos: com (Grupo A) ou sem (Grupo B) a calibração da madrugada (entre 1:00 e 5:00 AM). A acurácia do método foi mostrada pela diferença relativa absoluta (DRA por cento). RESULTADOS: Trinta e quarto dados de monitorização foram avaliados em um total de 112 noites. Um total de 289 leituras pareadas foi analisado - 195 no Grupo A e 94 no Grupo B. Não foi encontrada diferença em DRA% em nenhum período do dia quando adicionada a calibração durante a madrugada. CONCLUSÕES: Esses dados sugerem que a calibração da madrugada não altera a acurácia do método.

Predicting malignant involvement in a thyroid nodule: role of ultrasonography.

OBJECTIVE: To assess how ultrasonography can contribute during the evaluation of a thyroid nodule and whether this technique can have a role in predicting malignant involvement. METHODS: In this retrospective study, data were analyzed on 220 consecutive patients (with 348 thyroid nodules) who underwent thyroidectomy and had previously undergone assessment by high-resolution thyroid ultrasonography. Nodule size, echogenicity, regularity of margins, halo sign, presence or absence of calcifications, and invasion of surrounding tissues were evaluated. The nodules were classified as low, medium, or high risk for malignant involvement on the basis of nodule characteristics found on ultrasonography. All nodules were submitted to cytologic examination by fine-needle aspiration (FNA) before thyroidectomy. Ultrasound, FNA, and pathologic postoperative results were compared. RESULTS: Among the 348 thyroid nodules, 56 were ultrasonographically classified as low risk, 268 as medium risk, and 24 as high risk for malignant potential. Fifty of 56 (89.3%) low-risk nodules and 213 of 268 (79.5%) medium-risk nodules were diagnosed as benign at pathologic postoperative examination. In contrast, however, only 6 of 24 (25%) high-risk nodules were diagnosed as benign. Among the 18 high-risk nodules of 1-cm diameter or larger, FNA showed a 20% false-negative result. CONCLUSION: High-risk classification of a thyroid nodule on ultrasonography had a positive predictive value for malignant involvement of 75%. Nodule characteristics analyzed by ultrasonography should be considered at the time of surgical intervention.

Dislipidemia pós-prandial como achado precoce em indivíduos com baixo risco cardiovascular / Postprandial dyslipidemia as a precocious finding in subjects with low cardiovascular risk

OBJETIVO: correlacionar a hipertrigliceridemia pós-prandial com conhecidos fatores de risco para aterosclerose. MATERIAL E MÉTODOS: Foram estudados 47 pacientes não diabéticos (30 mulheres e 17 homens, idade: 40,5 ± 14,9 anos, IMC: 26,1 ± 5,4kg/m2) com trigliceridemia de jejum normal (<200mg/dl). Triglicerídeos, HDL e colesterol total foram medidos nos tempos 0, 3 e 5 horas após ingestão de aproximadamente 70g de gordura (200g de creme de leite a 25 por cento e 2 gemas), sendo então avaliados vários parâmetros. RESULTADOS: Pacientes com pico de triglicerídeos de 3 horas maior que o Segundo- quartil (164,8mg/dl), apesar de triglicerídeos de jejum normais, apresentaram maior IMC (28,1 ± 5,6 vs. 24,2 ± 4,5kg/m2; p= 0,008), maior circunferência abdominal (95,7 vs. 84,1 cm; p= 0,001), maior relação cintura/quadril (0,92 vs. 0,86; p= 0,008), maior pressão diastólica (83,1 vs. 77,2mmHg; p= 0,02) e menor HDL (39,1 vs. 48,3mg/dl; p= 0,008). CONCLUSÕES: A hipertrigliceridemia pós-prandial se correlaciona com vários fatores de risco cardiovascular mesmo em pacientes normotrigliceridêmicos.