[Microfertilization techniques: con]

The actually used microfertilization procedures are exposed according to potential indications: flagellar immotility, previous unexplained failure of IVF, and oligo-asthenoteratozoospermia. Results of two prospective randomized studies are presented in case of severe asthenozoospermia associated with at least one previous failure of IVF. Evaluation of fertilization rates confirms that ZD does not improve IVF prognosis whereas SUZI could be used to enhance IVF results. Authors focused on major methodological criticisms raising about most of published series, on relatively low evolutive pregnancy rate (5.7%) and on the need of randomized prospective studies for judge real interest of assisted fertilization.