Will Piezo-ICSI Increase Fertilization Rates Compared to Conventional ICSI? A Prospective Randomized Sibling Study.

Intracytoplasmic sperm injection (ICSI) has successfully been used to treat both severe male infertility and fertilization failure since its introduction in the early 1990´s. During the procedure a single sperm is injected into the cytoplasm of an oocyte to achieve fertilization. This technique is intrusive, has a relatively long learning curve and variable operator performance.

A new injection technique called piezo-ICSI has recently been introduced. During piezo-ICSI, a piezo-electric effect is generated through the conversion of electric energy to mechanical energy. This causes a smooth movement of the injection pipette, which allows for steady, controlled microinjections with less psychical stress applied on the oocytes than by the conventional technique.

A recent analysis, based on data from 9 different studies comparing conventional ICSI and piezo-ICSI (17500 cases), showed a benefit of piezo. Unfortunately, proper randomized trials are missing from this analysis. The proposed study is a randomized controlled study carried out at two private IVF clinics. Eligible participants are patients undergoing ICSI treatment, with a minimum of 6 oocytes. The participants will act as their own controls, with their oocytes randomly and equally divided between injection by the investigated and the conventional technique.

Whether piezo-ICSI is associated with improved success rates or reduction in adverse outcomes is at present unclear. Patients with fragile oocytes may benefit more from piezo-ICSI. In patients above 35 years, piezo-ICSI has been associated with a lower oocyte degeneration rate and an increased blastocyst rate. The aim of the study is to investigate whether the piezo-ICSI technique will result in more oocytes becoming normally fertilized compared to conventional ICSI. Another proposed benefit of piezo-ICSI lies in the standardization and simplification of the ICSI procedure. Making the injection procedure more independent of operator skill may result in a more robust and predictable laboratory output.