The blood received by the parasitic twin has already been used by the normal fetus, and as such is already de-oxygenated, leaving little developmental nutrients for the acardiac twin. Because it is pumping blood for both itself and its acardiac twin, this causes extreme stress on the normal fetus heart. Many T.R.A.P. pregnancies result in heart failure for the healthy twin. This twinning condition usually occurs very early in pregnancy. A rare variant of the acardiac fetus is the acardius acormus where the head is well developed but the heart and the rest of the body are rudimentary. While it is thought that the classical T.R.A.P./Acardius sequence is due to a retrograde flow from the umbilical arteries of the pump twin to the iliac arteries of the acardiac twin resulting in preferential caudal perfusion, acardius acormus is thought to be a result of an early embryopathy. Images of parasitic twins
Human
Animals
See also
Dipygus
Frank Lentini
Lakshmi Tatma
Lazarus and Joannes Baptista Colloredo
Rudy Santos
Vestigial twin

References
Further reading
Lebel, Robert Roger; Carlos Mock; Jeannette Israel; William Senica (June 1994). "Twin reversed arterial perfusion syndrome, acephalic presenting at full term". TheFetus.net. Retrieved 18 February 2013.
Insulin glulisine is a rapid-acting modified form of medical insulin that differs from human insulin in that the amino acid asparagine at position B3 is replaced by lysine and the lysine in position B29 is replaced by glutamic acid. It was developed by Sanofi-Aventis and approved for marketing by the FDA in 2004; it is sold under the trade name Apidra. When injected subcutaneously, it appears in the blood earlier than human insulin. When used as a meal time insulin, the dose is to be administered within 15 minutes before or 20 minutes after starting a meal. Intravenous injections may also be used for extreme hyperglycemia, but must be performed under the supervision of a medical professional.The most common side effects include hypoglycaemia (low blood glucose levels). Medical uses
Insulin glulisine is indicated for the treatment of diabetes mellitus. References
External links
"Insulin glulisine". Drug Information Portal. U.S. National Library of Medicine.