A 61-year-old women with a mechanical aortic valve on chronic warfarin therapy was referred to the emergency department (ED) for urgent computed tomography (CT) imaging of the right leg to rule out an arterial clot. CT imaging revealed two arterial thromboses the right lower extremity and an echocardiogram revealed a thrombus near the prosthetic heart valve. The attending physician ordered discontinuation of warfarin and initiation of a heparin drip.

Special thanks to Freya Spielberg, MD, MPH, Founder and CEO of Urgent Wellness LLC in Washington, DC; and Jack Westfall, MD, MPH, Director of the Robert Graham Center for Policy Studies in Family Medicine and Primary Care, for their thoughtful interviews on the topic of Primary Care and Patient Safety, which helped lay the groundwork for this Perspective.

A 49-year-old woman was referred by per primary care physician (PCP) to a gastroenterologist for recurrent bouts of abdominal pain, occasional vomiting, and diarrhea. Colonoscopy, esophagogastroduodenoscopy, and x-rays were interpreted as normal, and the patient was reassured that her symptoms should abate. The patient was seen by her PCP and visited the Emergency Department (ED) several times over the next six months. At each ED visit, the patient’s labs were normal and no imaging was performed.

The focus on patient safety in the ambulatory setting was impacted by the COVID-19 pandemic and appropriately shifting priorities to responding to the pandemic. This piece explores some of the core themes of patient safety in the ambulatory setting, including diagnostic safety and diagnostic errors. Ways to enhance patient safety in the ambulatory care setting and next steps in ambulatory care safety are addressed. 

A 52-year-old man complaining of intermittent left shoulder pain for several years was diagnosed with a rotator cuff injury and underwent left shoulder surgery. The patient received a routine follow-up X-ray four months later.

After a breast mass was identified by a physician assistant during a routine visit, a 60-year-old woman received a diagnostic mammogram and ultrasound. The radiology assessment was challenging due to dense breast tissue and ultimately interpreted as “probably benign” findings. When the patient returned for follow-up 5 months later, the mass had increased in size and she was referred for a biopsy.