Closed pnrobinson closed 6 months ago
Ductus venosus (DV) is supposed to play an essential role in fetal circulation because it allows the oxygenated placental blood to bypass the liver and enables preferential flow via the right atrium and foramen ovale to the left atrium. Furthermore, normal umbilical flow via DV is involved in the normal development of the intrahepatic portal venous system (IHPVS)1.
The lack of ‘critical anastomoses’ between the portal and umbilical venous system and hepatic–systemic venous system results in agenesis of ductus venosus (ADV) and shunting of umbilical blood through an aberrant vessel. Between 1 in 2532 to 1 in 556 fetuses had various incidences of ADV2,3.
Two main types of ADV have been described, depending on the course and connection of the umbilical vein (UV). The umbilical-portal-hepatic shunting type is associated with intrahepatic drainage to the portal sinus (PS) or a hepatic vein (HV). The UV bypasses the liver less frequently and presents an extrahepatic course, draining into the systemic venous circulation such as the inferior vena cava (IVC) or right atrium. It rarely drains into the left atrium, iliac vein, or coronary sinus5.
Different outcomes of ADV cases have been reported, related either to their association with other fetal abnormalities and the nuchal translucency (NT) measurement, the development of the PVS, the type of umbilical shunt, or the caliber of the shunt6-9. However, the isolated nature of the anomaly is best associated with a favorable outcome3.
The failure to develop critical anastomosis between the UV and vitelline venous system represents the link between the association of ADV and total or partial agenesis of the portal venous system. ADV and PVS anomalies have a common origin, and the prognosis is variable, given the physiological importance of the two venous systems.
References:
See also this for disease annotation -- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6681314/
@DominicIliescu are these good definitions for the two subtypes?
Ductus venosus agenesis with intrahepatic drainage. Def: A form of ductus venosus agenesis in which the umbilical vein connects via the portal sinus to the portal venous system (PVS) without giving rise to the ductus venosus. In some cases an intrahepatic shunt from a portal to a hepatic vein can be detected prenatally. This variant has been reported to have a favorable prognosis. PMID:28934814
Ductus venosus agenesis with extrahepatic drainage and liver bypass Def: A form of ductus venosus agenesis in which umbilical vein does not connect to the portal venous system (PVS). The liver is bypassed and the umbilical vein drains into a systemic vein, e. g. the inferior vena cava, right atrium, or rarely the left atrium, coronary sinus or iliac vein. This variant has been reported to have an unfavorable prognosis due to a presumed association with congestive heart failure and hydrops. PMID:28934814
(Definitions adapted from Strizek B, Zamprakou A, Gottschalk I, Roethlisberger M, Hellmund A, Müller A, Gembruch U, Geipel A, Berg C. Prenatal Diagnosis of Agenesis of Ductus Venosus: A Retrospective Study of Anatomic Variants, Associated Anomalies and Impact on Postnatal Outcome. Ultraschall Med. 2019 Jun;40(3):333-339. English. doi: 10.1055/s-0043-115109. Epub 2017 Sep 21. PMID: 28934814.)
Yes, the definitions are correct.
I would add: When DV was absent, the type of the shunt was investigated. According to the prenatal classification, the shunt types were reported: type I, umbilical–systemic shunt (USS), type II, ductus venosus–systemic shunt (DVSS) and type III, portal–systemic shunt, divided into type IIIa, intrahepatic portal–systemic shunt (IHPSS) and type IIIb, extrahepatic portal–systemic shunt (EHPSS).[Achiron, R.; Kivilevitch, Z. Fetal umbilical-portal-systemic venous shunt: In-utero classification and clinical significance. Ultrasound Obs. Gynecol. 2016, 47, 739–747.Wu, H.; Tao, G.; Cong, X.; Li, Q.; Zhang, J.; Ma, Z.; Zhang, Z. Prenatal sonographic characteristics and postnatal outcomes of umbilical-portal-systemic venous shunts under the new in-utero classification: A retrospective study. Medicine 2019, 98, e14125.]. Recently, a new category was proposed, type IV, for cases with multiple shunts, of different types.[Nagy, R.D.; Iliescu, D.G.Prenatal Diagnosis and Outcome of Umbilical–Portal–Systemic Venous Shunts: Experience of a Tertiary Center and Proposal for a New Complex Type. Diagnostics 2022, 12, 873. https://doi.org/10.3390/diagnostics12040873]
Dominic
On Thursday, April 7, 2022, 05:34:01 PM GMT+3, Peter Robinson ***@***.***> wrote:
@DominicIliescu are these good definitions for the two subtypes?
Ductus venosus agenesis with intrahepatic drainage. Def: A form of ductus venosus agenesis in which the umbilical vein connects via the portal sinus to the portal venous system (PVS) without giving rise to the ductus venosus. In some cases an intrahepatic shunt from a portal to a hepatic vein can be detected prenatally. This variant has been reported to have a favorable prognosis. PMID:28934814
Ductus venosus agenesis with extrahepatic drainage and liver bypass Def: A form of ductus venosus agenesis in which umbilical vein does not connect to the portal venous system (PVS). The liver is bypassed and the umbilical vein drains into a systemic vein, e. g. the inferior vena cava, right atrium, or rarely the left atrium, coronary sinus or iliac vein. This variant has been reported to have an unfavorable prognosis due to a presumed association with congestive heart failure and hydrops. PMID:28934814
(Definitions adapted from Strizek B, Zamprakou A, Gottschalk I, Roethlisberger M, Hellmund A, Müller A, Gembruch U, Geipel A, Berg C. Prenatal Diagnosis of Agenesis of Ductus Venosus: A Retrospective Study of Anatomic Variants, Associated Anomalies and Impact on Postnatal Outcome. Ultraschall Med. 2019 Jun;40(3):333-339. English. doi: 10.1055/s-0043-115109. Epub 2017 Sep 21. PMID: 28934814.)
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@DominicIliescu the HPO likes to separate out phenotypic features, i.e., to not "bundle" combinations of features. I wonder if it would be better to create separate terms for the four shunt types? Or are they always seen with DV agenesis, i.e., they cannot occur in other situations? I am sorry but I am not 100% sure how the four types related to the two other subtypes?
The term umbilical shunt refers to the absence/agenesis of ductus venosus accompanied by umbilical shunting via postal or systemic circulation. The intrahepatic or extrahepatic classification is simple, while the type 1 to 3 classification is more complex, but also more accurate. I would recommend that both classifications should be part of the text, as presented in the previous contribution, because the studies may refer to any of the two classifications.
Dominic Iliescu, MD, PhD, MPH Associate Professor, University of Medicine and Pharmacy CraiovaPetru Rares nr.2, Craiova, Dolj, Romania, 200349 Chief Physician of the 2nd Clinic of Obstetrics and Gynecology, Emergency County University Hospital CraiovaTabaci nr.1, Craiova, Dolj, Romania, 200642 Phone: +40723 888 773
On Sunday, April 10, 2022, 02:05:42 PM GMT+3, Peter Robinson ***@***.***> wrote:
@DominicIliescu the HPO likes to separate out phenotypic features, i.e., to not "bundle" combinations of features. I wonder if it would be better to create separate terms for the four shunt types? Or are they always seen with DV agenesis, i.e., they cannot occur in other situations? I am sorry but I am not 100% sure how the four types related to the two other subtypes?
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For now let's move forward like this, we can revise at a future workshop as needed.
Adding new term:
and
Adding new term:
Preferred term label: Ductus venosus agenesis
Synonyms Agenesis of the ductus venosus
Definition (free text, please give PubMed ID) A developmental defect characterized by lack of formation of the ductus venosus (a shunt that allows oxygenated blood in the umbilical vein to bypass the liver in the fetal circulation). Agenesis of the ductus venosus can manifest in two different morphologic patterns: The umbilical vein drains exclusively into the left branch of the intrahepatic portal vein or the umbilical vein drains into the inferior vena cava or directly into the right atrium by-passing the liver completely. PMID: 10765517 Parent term (use hpo.jax.org/app) Abnormality of the fetal cardiovascular system HP:0010948
Diseases characterized by this term ? (e.g. Orphanet or OMIM number)
Your nano-attribution (ORCID)