Remuald P. Sheinman, 51, a systems analyst with a computer firm in Rockville, a part-time real estate agent and a Russian-language translator, died of cardiac arrest Wednesday at Washington Adventist Hospital in Takoma Park.

Mr. Sheinman was born in Minsk, in the Soviet Union. Before immigrating to the United States in 1975, he lived most of his life in Leningrad. He graduated from the Leningrad Economic and Engineering Institute in 1952 and earned a doctorate there in 1964. He was employed by the U.S.S.R. Academy of Sciences as chief of a research group in the Leningrad branch of the Central Economic and Mathematics Institute.

In 1974, Mr. Sheinman left the Soviet Union and went to Italy. The following year, he came to the United States and settled in Silver Spring.

From 1975 to 1979, he was a systems analyst with the System Automation Corporation in Silver Spring. From 1979 until his death, he was a systems analyst with Decision Systems Associates Inc. in Rockville. He became a U.S. citizen in 1980.

In addition to his computer work, Mr. Sheinman engaged in part-time real estate work and Russian translation.

His marriage to the former Lengina Bogachunas ended in divorce.

Survivors include his wife, the former Marianne May, whom he married in 1976, of Silver Spring; one daughter by his first marriage, Olga Sheinman of Arlington; his mother, Sima L. Leibovich, of Minsk, and two brothers, Valery, of Rockville, and Yuri, of New York City.

The family suggests that expressions of sympathy be in the form of contributions to the American Heart Association, or to a charity of one's choice.