¿Es la temperatura ambiente un factor condicionante del resultado en ciclos de inyección intracitoplasmática de espermatozoides?

Abstract

Objectives The results of in vitro fertilization/intracytoplasmic sperm injection (IVF-ICSI) cycles in assisted reproduction clinics show distinct degrees of variability. The sensitivity of spermatogenesis to various types of stress results in distinct spermatic populations. Since the male factor (pure or mixed male factor) plays an important role in about 50% of IVF-ICSI cycles, identifying how temporary environmental stress might affect the final ejaculation is important. Observation of temporal patterns of pregnancy rates in our center prompted us to investigate the possible relationship between these rates and the temperature in the city. Material and methods We performed a retrospective, randomized study of the pregnancy rates in our center in 3 consecutive years. Patients undergoing ICSI cycles, aged less than 38 years old, and with no ovarian failure were included. Patients whose eggs had been microinjected with donor sperm were excluded. Results Analysis of the data revealed an association between decreases in pregnancy rates in IVF cycles and the high temperatures registered in Seville during summer.