Unusual Resistance to Intravenous Anesthetic Drugs in a Rachipagus Infant: A Case Report.

In conjoined twins when one of the twins is incompletely formed and is dependent on the healthy counterpart for survival, they are described as heteropagus (parasitic) twins. Rachipagus is a type of parasitic twin joined at the spine above the sacrum. Such neonates can present with complex problems related to anesthesia. We encountered one such infant for a routine contrast-enhanced computed tomography (CECT) angiography under sedation. The infant was resistant to multiple anesthetic drugs like fentanyl, propofol, and ketamine. Later general anesthesia was induced with thiopentone sodium, and the procedure went on uneventfully.