Year : 2003 | Volume
: 13 | Issue : 4 | Page : 421--422
A case of acardiac twinning
HB Suresh, PK John
Department of Radiodiagnosis, Fr Muller Medical College, Mangalore, India
H B Suresh
Department of Radiodiagnosis, Fr Muller Medical College, Mangalore
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Suresh H B, John P K. A case of acardiac twinning.Indian J Radiol Imaging 2003;13:421-422
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Suresh H B, John P K. A case of acardiac twinning. Indian J Radiol Imaging [serial online] 2003 [cited 2020 Jun 6 ];13:421-422
Available from: http://www.ijri.org/text.asp?2003/13/4/421/28725
Acardiac twinning is an extreme manifestation of twin transfusion syndrome. The acardiac twin presents with many bizarre anomalies which is thought to be due to low oxygen tension and alterations in foetal physiology .We present a case of which was diagnosed at 26 weeks of gestation.
A 20 year old primigravida patient came with history of abdominal pain to the obstetrician. She was of 26 weeks gestational age. The patient was referred for US examination. This revealed a live foetus of 26 weeks gestational age.This foetus did not reveal any detectable anomalies.
There was another foetus in the same amniotic cavity which had absence of thorax,head and upper limbs. There was only a foetal abdomen and lower limbs which appeared oedematous. There was a single placenta which appeared to be supplying both foetii [Figure 1],[Figure 2],[Figure 3],[Figure 4]..
The patient was admitted and advised rest.On the sixth day a repeat US was performed which showed similar findings. She developed labour pains the following day and she delivered a baby with a gestational maturing date of around 27 weeks.The baby developed respiratory distress and expired 17 hours after birth. The acardiac twin was delivered 15 minutes after the normal twin. The findings detected antenatally were corroborated. [Figure 5]. A plain radiograph showed lower three lumbar vertebrae and lower limb bones [Figure 6]
Acardiac twinning is also referred to as twin reversed arterial perfusion(TRAP) sequence. It has an incidence of 1 in 35000 pregnancies This suggests vascular disruption as an etiology rather than a primary cardiac defect.
It is the most severe complication in monozygotic Twinning.It is categorized as being of four types according to the site of maldevelopment.
(a) Acardius anceps : has a body and extremities with only a partially formed head and face.
(b) Acardiius acephalus: has a well developed pelvis and lower limbs without a head,thoracic organs or arms. The twin born in our hospital is of this category .
(c) Acardius amorphous: is a shapeless mass of tissue with no recognizable organs,but some form of axial structures.
(d) Acardius acormus: has only cranial development
There is a reported incidence of preterm labour in 79% of pregnancies, Polyhydramnios in 51 %,Congestive heart failure in 28% and pump foetal death in utero in 25%.There is an incidence of single umbilical artery and most cases show artery to artery and vein to vein anastomosis.The inadequate pump pressure leads to decreased oxygenated blood flow to this foetus with disruption and reduction of existing structures. Doppler study shows an elevated S/ D ratio due to the reversed flow in the acardiac twin umbilical artery .There is a higher incidence of other anomalies in the pump twin.
Active intervention with endoscopic laser ablation has shown varying degrees of success in various cases
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