Capítulo II –Relationship between visualization of meiotic spindle
in human oocytes and ICSI outcomes: a meta-analysis
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a non-invasive method, preserving cell viability (Wang et al., 2001a,b; Cooke et
al., 2003; Moon et al., 2003; Rienzi et al., 2003; Cohen et al., 2004, Konc et al.,
2004; Chamayou et al 2006; Montag et al., 2006; Shen et al; 2006; Taylor et al.,
2006; Fang et al., 2007; Rama Raju et al., 2007; Varghese et al., 2007; Madaschi
et al., 2008).
The meiotic spindle, by controlling chromosomal movements
throughout the different stages of meiosis, plays a key role in the successful
completion of meiosis. Disturbances of meiotic spindles have been suggested as
predisposing oocytes to perturbation of chromosomal segregation and subsequent
aneuploidy, maturation arrest, an increased incidence of cell death and
subsequent lower fertilization rates (Battaglia et al., 1996; Hardarson et al., 2000;
Eichenlaub-Ritter et al., 2002; Cooke et al., 2003; Varghese et al., 2007). In
various studies, oocytes in which the meiotic spindles were visualized have
demonstrated a significant increase in ICSI outcomes such as fertilization rates
(Wang et al., 2001a; Rienzi et al., 2003; Cohen et al., 2004; Shen et al., 2006;
Taylor et al., 2006; Madaschi et al., 2008; Rama Raju et al., 2007) and embryo
development (Wang et al., 2001a; Cohen et al., 2004; Shen et al., 2006;
Madaschi et al., 2008; Rama Raju et al., 2007). However, other studies have not
confirmed this correlation (Moon et al., 2003; Fang et al., 2007). The present
meta-analysis aimed to investigate the relationship between meiotic spindle
presence in human oocytes and in ICSI in vitro and in vivo outcomes.