Chest compression alone effective during cardiac arrest, find studies

From MedGuru:

According to the results of twin studies, cardiopulmonary resuscitation (CPR) alone is a successful method of saving heart attack victims.

Researchers from University of Washington (UW) in Seattle, US and Karolinska Institute at Södersjukhuset, Sweden found in dual studies that CPR– rhythmic pressing on patients’ chest to physically pump blood through the heart–is as useful a way of rescuing heart attack patients as combination-CPR (involving chest compression and mouth-to-mouth respiration).