Pregnancy and childhood health and developmental outcomes with the use of posthumous human sperm

Oocyte recovery after overnight ovary transport provides an alternative source of cumulus oocyte complexes that are competent to produce live piglets

COVID-19 impacted abattoirs worldwide. The processing lines became a hotspot for the spread of COVID-19 resulting in plant restructuring and ultimately a critical loss of pig material for research. Commercial sources of pig oocytes are available but are costly and companies were already operating at a maximum capacity for supplying the oocyte needs around the United States. Here, we provide an alternative source of oocytes that are competent to produce live, healthy piglets.

It Is Premature to Use Postmortem Sperm for Reproductive Purposes: a Data-Driven Opinion

Postmortem sperm retrieval for reproductive purposes is an assisted reproduction procedure that offers women an opportunity to have a child using sperm retrieved from their deceased partners. The ethical issues of this procedure have been discussed in previous works. However, an assessment of the procedure using a scientific perspective is still lacking. Here, we aim to ascertain, using a biological standpoint, whether postmortem sperm should be rescued for reproductive purposes. Data suggest that it is premature to use postmortem sperm for reproductive purposes. This procedure should not be clinically applied until appropriate and comprehensive analyses have been completed. Such analyses should be focused not only on fertilization, embryo development, and pregnancy outcomes, but also on potential postmortem alterations of sperm DNA, RNAs, and proteins. In addition, genetic and epigenetic analyses of sperm, pre-implantation embryos, and newborns, as well as mental and physical health follow-up of the resulting offspring during a whole life cycle, using appropriate non-human mammalian models, are warranted.

[Postmortem sperm retrieval: Two cases report and review of technical and legislative aspects in Spain]

INTRODUCTION AND OBJECTIVES

Advances in assisted reproductive techniques (ART) have caused an increase in requests for postmortem sperm retrieval (PMER). The use of these techniques is usually tied to legal, ethical and medical/casuistic problems. The objective of this work is to analyze technical and legal aspects of PMER in Spain using two real cases and to establish guidelines to help in decision-making after a PMER request.

MATERIAL AND METHODS

Two real cases in which a PMER was requested and others published in Spain in recent years are presented. We proceed to an exposition of the techniques used in postmortem ART cases and specifically in PMER, and a detailed study of the current legal framework is carried out.

RESULTS

In Spain we have a complete law on ART. Article 9 expressly requires an authorization from the deceased male partner for the use of his reproductive material in the following 12 months. Regarding the PMER, technical and logistical considerations require a quick and organized decision-making. The time until extraction should not exceed 24-36hours from death and a good choice of biological material is essential.

CONCLUSIONS

Medical-scientific advances now allow PMER and the use of postmortem ART. A good knowledge of the technical, logistical and legal aspects is necessary for a fast and coordinated action.

Balancing rules in postmortem sperm donation

Postmortem sperm donation implies the acceptance of a very low sperm quality threshold. This threshold has two important consequences: recipients will have to submit to burdensome and expensive in vitro fertilisation/intracytoplasmic sperm injection, and many more living donors will be accepted, thus making postmortem donors largely superfluous. Given these strong arguments against the use of postmortem collected sperm, a good alternative to enlarge the donor pool would be men who stored sperm for self-use and no longer have the intention to use it.

Perimortem and postmortem sperm acquisition: review of clinical data

PURPOSE

To provide the clinicians with the most comprehensive medical information about sperm acquisition peri/postmortem.

METHODS

The review was conducted according to the PRISMA statement. MEDLINE and Cochrane databases were searched up to January 2021. All studies reporting post or perimortem harvesting of sperm with any indication of an outcome, recognition and viability of sperm, and its utilization and treatment outcome were included. Studies that recorded cases but discussed only the ethical or legal issues without any information about the medical details were excluded.

RESULTS

Twenty-four studies were included in this review. One hundred forty-eight cases were described; in 113 of them, sperm was retrieved. A variety of techniques for sperm acquisition were used. The data collected are limited and comparing the efficacy of the different approaches is not feasible. The longest time interval described between the death and viable sperm acquisition was 3 days. The sperm quality varies between the studies. One hundred thirty-six mature oocytes were injected with the retrieved sperm; the fertilization rate was 41%. Transfer cycles of 25 embryos and 8 live births are reported in the medical literature.

CONCLUSION

The overall low quality and high heterogeneity of the available data impair the ability to draw definitive conclusions. However, it can be stated that sperm acquisition up to at least 3 days postmortem can result in the live birth of healthy offspring. Further studies are needed to clarify the medical questions regarding the best techniques, success rates, and wellbeing of the parties involved.

[Brain death criterion and organ donation: current neuroscientific perspective]

In der akademischen und öffentlichen Debatte wird der irreversible Hirnfunktionsausfall als Kriterium des Todes (Hirntodkriterium) immer wieder hinterfragt. Im vorliegenden Artikel werden 6 prototypische Thesen gegen das Hirntodkriterium diskutiert: 1) Nichtsuperiorität des Gehirns gegenüber anderen Organen, 2) Unsicherheit der Hirntoddiagnostik, 3) erhaltene Schmerzempfindung Hirntoter, 4) (spontane) sexuelle Reifung und erhaltene Reproduktionsfunktion Hirntoter, 5) Symmetrie von Hirntod und Embryonalphase, 6) Gleichsetzung des intensivmedizinisch erhaltenen Restorganismus Hirntoter mit dem lebenden Menschen.

Keine dieser Thesen hält einer kritischen Analyse stand. In Deutschland wird das Ganzhirntodkriterium angewendet. Der Hirntod geht mit dem völligen Ausfall jeglicher Empfindung, Bewusstheit, Mimik, Augen‑, Zungen- und Schlundmotorik, Willkürmotorik und Sexualfunktion einher (funktionelle „Enthauptung“). Medizinisch-technisch können andere Organe bzw. ihre Primitivsteuerung ersetzt werden, nicht aber das Gehirn. Das Gehirn, nicht der Körper, ist bestimmend für das menschliche Individuum. Die Gleichsetzung des künstlich erhaltenen Restorganismus, naturphilosophisch als lebendiges System interpretierbar, mit dem Organismus desselben lebenden Menschen wird durch die beliebige Reduzierbarkeit der Anzahl beteiligter Organe ad absurdum geführt. Der irreversible Hirnfunktionsausfall führt unausweichlich zum Herzstillstand, unbehandelt innerhalb von Minuten, unter Intensivtherapie i. d. R. innerhalb von Tagen. Auch beim Embryo/Fötus führt die Fehlanlage des gesamten Gehirns zum (vorgeburtlichen) Tod. Die in Deutschland gesetzliche Richtlinie zur Hirntodfeststellung hat eine im internationalen Vergleich hohe Diagnosesicherheit, es sind damit keine bestätigten Fehldiagnosen aufgetreten.

The ethical case for non-directed postmortem sperm donation

In this article we outline and defend the concept of voluntary non-directed postmortem sperm donation. This approach offers a potential means of increasing the quantity and heterogeneity of donor sperm. This is pertinent given the present context of a donor sperm shortage in the UK. Beyond making the case that it is technically feasible for dead men to donate their sperm for use in reproduction, we argue that this is ethically permissible. The inability to access donor sperm and the suffering this causes, we argue, justifies allowing access to sperm donated after death. Moreover, it is known that individuals and couples have desires for certain sperm donor characteristics which may not be fulfilled when numbers of sperm donors are low. Enacting these preferences contributes significantly to the well-being of intended parents, so we argue that this provides a pro tanto reason for respecting them. Finally, we explore the benefits and possible disadvantages of such a system for the various parties affected.

Spermatozoa retrieval for cryopreservation after death

Objectives

To describe the retrieval spermatozoa technique for cryopreservation after death, including the proximal part of vas deferens.

Material and Methods

A 28-years old man, with previous history of infertility, who had died 12 hours before, was submitted to spermatozoa retrieval for cryopreservation, with surgical bilateral resection in bloc of the proximal part of vas deferens, testicle and epididymis. At the laboratory, by milking the epididymis and vas deferens, the extracted fluid was collected; also, three samples of each testicle parenchyma were also harvested.

Results

The fluid from the vas deferens showed spermatozoa, mostly with in situ motility. Testicular fragments also presented spermatozoa, mostly with small tail movements or immobile.

Conclusion

The inclusion of the proximal part of vas deferens during spermatozoa retrieval after death must be performed, since it contains high concentration of spermatozoa, and even in the presence of previous infertility, as was with this patient, it is possible to retrieve spermatozoa.

Posthumous conception by presumed consent. A pragmatic position for a rare but ethically challenging dilemma

The prevailing legal position and opinion of professional societies such as the European Society for Human Reproduction and Embryology and the American Society for Reproductive Medicine is that posthumous sperm conception should only occur in the presence of explicit written consent from the deceased man. However, in our opinion this is an impractical approach as the majority of deaths of reproductive-age men are sudden and unexpected, thereby precluding explicit consent. Previously in this journal we have outlined arguments supporting a move to a standard of presumed consent for posthumous conception, with provisions for men to 'opt out' and safeguards to protect the welfare of the prospective mother and her child. In a recent commentary in this journal, Kroon outlines arguments against our position of presumed consent as an unacceptable violation of the deceased's autonomy. However, such arguments on the primacy of the rights of the dead are in our opinion not paramount, especially since this position blocks access to posthumous conception for the majority who support its use. The objective of this commentary is to provide a rebuttal to the concerns raised by Kroon and hopefully reorientate the discussion towards the rights and welfare of the living (widow, prospective child), not the dead.