UPDATE 1-US FDA staff seek new warning on Baxter anesthetic

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WASHINGTON, March 21 (Reuters) - U.S. regulatory staff have recommended updating the prescribing instructions for a Baxter International (BAX.N: Quote, Profile, Research, Stock Buzz) anesthesia drug after three reports of cardiac arrest in children, documents released on Friday said.

Food and Drug Administration staff said it was "possible" the cases were associated with the Baxter drug, Suprane. But they also said each of the patients was being treated with other drugs that may cause cardiac arrest.

The label for Suprane, known generically as desflurane, already carries warnings about other cardiac problems including heart attacks, irregular heart beats and unstable blood pressure.

"The contributory role of desflurane could not be excluded" in the three reports of cardiac arrest in children, FDA staff wrote in a summary prepared for an outside advisory panel.

"However, the simultaneous use of concomitant medications during anesthesia confounded the causality assessment of these cases," the agency reviewers said.

All three of the patients recovered with treatment.

The FDA reviewers said Suprane's label "should be revised to include cardiac arrest."

Baxter spokeswoman Erin Gardiner said the company would review the FDA staff analysis.