Government studies hospital errors in Arizona

TUCSON, Ariz. -- Tucson Medical Center is under investigation by state and federal regulators because of mistakes that led to the deaths of five patients during the past two years.

Four of the five patients were seriously ill, the Arizona Daily Star reported Wednesday. But in one case, an otherwise healthy 73-year-old man died after surgery because a nurse accidentally swapped his oxygen and suction tubes, the newspaper said.

Problems documented at the hospital are enough to threaten its state license and Medicare certification.