The use of tourniquets may have saved the lives of some victims of the Boston Marathon bombings, according to doctors who helped treat the wounded. Dr. John F. Kragh Jr., an Army surgeon whose research has shown the benefits of tourniquets, said care is needed because they can cause harm if not used correctly. Dr. Richard Bradley, a member of the American Red Cross' scientific advisory council, said some situations may warrant the use of tourniquets and some the application of direct pressure to a wound.

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