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This Primer provides an overview of the history and current status of the patient safety field and key definitions and concepts. It links to other Patient Safety Primers that discuss the concepts in more detail.

A woman with a history of chronic obstructive pulmonary disease underwent hip surgery and experienced shortness of breath postoperatively. A chest radiograph showed a pneumothorax, but the radiologist was unable to locate the first call physician to page about this critical finding.

Based on preoperative discussions, a patient undergoing knee replacement expected to receive spinal anesthesia; however, general anesthesia was administered, and the records did not note or explain this change. The patient suffered an unusual complication.