Previous studies of perioperative and anesthesia-related cardiac arrest and mortality in older patients.

*Studies that included only older patients; CA: cardiac arrest; NR: not reported; OR: operating room; ASA = American Society of Anesthesiologists; PACU: postanesthesia care unit.*仅纳入老年患者的研究；CA：心脏骤停（cardiac arrest）；NR：未报告（not reported）；OR：手术室（operating room）；ASA=美国麻醉医师协会（American Society of Anesthesiologists）；PACU：麻醉后监护病房（postanesthesia care unit）。