Semen processing by density gradient centrifugation does not improve sperm apoptotic deoxyribonucleic acid fragmentation rates

We wished to verify whether semen processing by discontinuous double-layered density gradient centrifugation could improve sperm apoptotic DNA fragmentation rates using a commercially available deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick end labeling assay in 35 consecutive men presenting for assisted reproductive treatments. Although sperm motility did improve as expected, no effects were observed in sperm apoptotic DNA fragmentation rates, and this should be considered in the routine assisted reproduction setting.     

Embryotoxicity of serum from women smoking cocaine base paste (CBP)

OBJECTIVE: Using a mouse embryo bioassay, we examined the embryotoxic properties of serum obtained from eight women who had ingested cocaine base paste (CBP) for a period of 1-3 years. STUDY DESIGN: Two-cell stage mouse embryos were cultured in the presence of serum extracted from eight CBP-smoking or control women. After 48h, embryos were evaluated to determine their developmental stage and then processed by Tarkoswki's technique to determine the proportion of embryos with micronuclei, in order to establish the number of micronuclei/embryo. RESULTS: Serum from CBP patients diminished the percentage of embryos progressing to the compacted morula stage, while increasing the proportion of embryos with micronuclei and the corresponding micronuclei/embryo ratio. CONCLUSION: These findings provide the first experimental evidence of embryotoxic compounds in the serum of CBP-smoking women. This study highlights the reproductive risk of chronically ingested CBP and demonstrates the need for further studies.     

Premedication for tracheal intubation in neonates: confusion or controversy?

Tracheal intubation is performed frequently in the NICU and delivery room. This procedure is extremely distressing, painful, and has the potential for airway injury. Premedication with sedatives, analgesics, and muscle relaxants is standard practice for pediatric and adult intubation, yet the use of these drugs is not common for intubation in neonates. The risks and benefits of using premedications for intubating unstable newborns are hotly debated, although recent evidence shows that premedication for non-urgent or semi-urgent intubations is safer and more effective than awake intubations. This article reviews clinical practices reported in surveys on premedication for neonatal intubation, the physiological effects of laryngoscopy and intubation on awake neonates, as well as the clinical and physiological effects of different drug combinations used for intubation. A wide variety of drugs, either alone or in combination, have been used as premedication for elective intubation in neonates. Schematically, these studies have been of three main types: (a) studies comparing awake intubation versus those with sedation or analgesia, (b) studies comparing different premedication regimens comprising sedatives, analgesics, and anesthetics, and (c) case series of neonates in which some authors have reported their experience with a specific premedication regimen. The clinical benefits described in these studies and the need for pain control in neonates make the case for using appropriate premedication routinely for elective or semi-urgent intubations. Tracheal intubation without the use of analgesia or sedation should be performed only for urgent resuscitations in the delivery room or other life-threatening situations when intravenous access is unavailable.