RESUMO
<p><b>OBJECTIVE</b>To observe the pregnancy promoting effect of L-carnitine combined with intracytoplasmic sperm injection (ICSI) in treating male infertility with oligoasthenozoospermia.</p><p><b>METHODS</b>We assigned 129 patients with oligoasthenozoospermia to receive 2 weeks of oral L-carnitine followed by ICSI (medication group, n = 42) and ICSI alone (control group, n = 87). We compared the sperm concentration and motility, the percentage of grade a + b sperm, and sperm deformity before and after L-carnitine medication, as well as the rates of fertilization, cleavage, available embryo and clinical pregnancy between the two groups.</p><p><b>RESULTS</b>The percentage of grade a + b sperm was significantly increased after L-carnitine medication as compared with the baseline ([13.5 +/- 10.7] % vs [9.6 +/- 7.2] %, P<0.05), and so was the rate of available embryo in the medication group after ICSI in comparison with that of the control group (77.50% vs 69.04%, P<0.05).</p><p><b>CONCLUSION</b>Short-term medication of L-carnitine can improve sperm quality and raise the success rate of ICSI.</p>