-Carpal tunnel syndrome (CTS) has been correlated to body mass index (BMI) increase. The present study was done in a Brazilian population to compare BMI values in the following groups: first, CTS vs. controls subjects, and, second CTS groups of increasing median sensory latency (MSL). According to MSL≥3.7 ms (wristindex finger, 14 cm), median/ulnar sensory latency difference≥0.5 ms (ring finger, 14 cm) or median palm-to-wrist (8 cm) latency≥2.3 ms (all peak-measured), 141 cases (238 hands) had CTS confirmation. All were symptomatic; previous surgery and polyneuropathy were excluded; mean age 50.3; 90.8% female. Controls subjects (n=243; mean age 43.0; 96.7% female) and CTS cases had BMI calculated (kg/m 2 ). Controls subjects had a mean BMI of 25.43±4.80 versus 28.38±4.69 of all CTS cases, a statistically significant difference (p < 0.001). The CTS groups of increasing MSL severity do not show additional increase in BMI (28.44 for incipient, 28.27 for mild, 28.75 for moderate and 29.0 for severe). We conclude that CTS cases have a significant correlation with higher BMI when compared to controls subjects; however, higher BMI do not represent a statistically significant increasing risk for more severe MSL.KEY WORDS: carpal tunnel syndrome, median nerve, compressive neuropathy, body mass index, nerve conduction studies.
Índice de massa corporal e síndrome do túnel do carpoRESUMO -Síndrome do túnel do carpo (STC) pode ser estar relacionada ao aumento de índice de massa corporal (IMC). O presente estudo foi realizado em uma população brasileira para comparar valores de IMC entre casos com STC e controles assintomáticos; os casos com STC foram ainda divididos em subgrupos de gravidade progressiva de acordo com a latência distal sensitiva do nervo mediano (LDS-M). Os casos de STC (141, 238 mãos) foram confirmados com LDS-M≥3,7 ms (punho-II dedo, 14 cm), diferença de latência mediano-ulnar≥0,5 ms (punho-IV dedo, 14 cm) ou latência palma-punho do nervo mediano≥2,3 ms (8 cm), todos medidos no pico do potencial. Todos os casos eram sintomáticos; foram excluídos casos com polineuropatia e cirurgia prévia; a média de idade foi 50,3 anos e 90,8% dos casos eram do gênero feminino. Os controles assintomáticos (243) Carpal tunnel syndrome (CTS), a common cause of numbness, paraesthesia and pain in hands due to compression of the median nerve under the transverse carpal ligament, has been correlated to