Antonina K. McCully von Bretzel, 61, a native of Russia who was adopted by an American admiral, became a nurse, and later worked at the Library of Congress, died at George Washington University Hospital Sunday following brain surgery for an aneurysm.

Mrs. von Bretzel was born in Sevastapol, Russia. In 1920, during the civil war that followed the Russian Revolution, she was one of seven children adopted by Adm. Newton McCully. The admiral was an American representative in Sevastapol at the time.

She accompanied him to posts in Washington, Charleston, S.C., and Brazil. Following his retirement in the 1930s, the family lived in St. Augustine, Fla.

Mrs. von Bretzel completed nurse's training in Jacksonvill, Fla. During World War II, she served in the Navy Nurse's Corps and was stationed at Bethesda Naval Hospital.

In 1945, she married George von Bretzel, now a retired official of the Central Intelligence Agency. They lived in Rahway, N.J., until 1950, when he joined the CIA. During the 1950s and 1960s, they lived in Europe and Japan.

In 1962 and 1963, between trips abroad, Mrs. von Bretzel was a senior abstractor at the aerospace information division of the Library of Congress. Her job was to abstract space information from Soviet publications.

Mrs. von Bretzel was a bridge player and competed in several tournaments in Washington and Maryland.

In addition to her husband, of the home in Darnestown, Md., survivors include a son, James Gregory, of Fort Lauderdale, Fla., a daughter, Alexandra Swindler of Glenwood, Md.; three sisters by adoption, Ludmila Colee of St. Augustine, Nina Lash of Detroit, and Nina McDonald of Palos Verdes Estates, Calif., and one grandson.