American Family Physician

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Animal bites are a significant burden to health care systems worldwide. In the United States, dog bites account for an average of 337,000 emergency visits and generate medical costs of up to $2 billion per year. Most animal bites in adults and children are from a dog, and most bite patients are children who have been bitten by animals known to them. Dog bites may cause crush and soft-tissue avulsion, whereas cat bites usually cause deeper puncture-type wounds. Children most often present with dog bites on the head and neck, and adolescents and adults usually present with dog bites on the extremities and hands...

Family physicians commonly find themselves in difficult patient encounters that can result in dissatisfaction for the patient and physician. Successful navigation of these encounters includes recognizing common physician factors, such as systemic pressures, interpersonal communication, and situational issues. The practice of labeling patient types can lead to disparities in care and patient harm and should be avoided. When physicians recognize that they are in a difficult patient encounter, simple mindfulness approaches, such as the Name It to Tame It and CALMER approaches, can improve outcomes...

Parasites are a source of significant illness worldwide. In the United States, giardiasis, cryptosporidiosis, cyclosporiasis, and trichinellosis are nationally notifiable conditions. Pinworm, the most common intestinal parasite in children, is not a locally notifiable infection. Intestinal parasites have a wide range of acute and chronic symptoms but should be suspected in those who present with diarrhea lasting more than seven days. Infections most often occur through a fecal-oral route. Symptoms tend to be worse for children, older adults, or immunocompromised individuals...

Hyponatremia and hypernatremia are electrolyte disorders that can be associated with poor outcomes. Hyponatremia is considered mild when the sodium concentration is 130 to 134 mEq per L, moderate when 125 to 129 mEq per L, and severe when less than 125 mEq per L. Mild symptoms include nausea, vomiting, weakness, headache, and mild neurocognitive deficits. Severe symptoms of hyponatremia include delirium, confusion, impaired consciousness, ataxia, seizures, and, rarely, brain herniation and death. Patients with a sodium concentration of less than 125 mEq per L and severe symptoms require emergency infusions with 3% hypertonic saline...

Pleural effusion affects 1.5 million patients in the United States each year. New effusions require expedited investigation because treatments range from common medical therapies to invasive surgical procedures. The leading causes of pleural effusion in adults are heart failure, infection, malignancy, and pulmonary embolism. The patient's history and physical examination should guide evaluation. Small bilateral effusions in patients with decompensated heart failure, cirrhosis, or kidney failure are likely transudative and do not require diagnostic thoracentesis...

Syncope is an abrupt, transient, and complete loss of consciousness associated with an inability to maintain postural tone; recovery is rapid and spontaneous. The condition is common, resulting in about 1.7 million emergency department visits in 2019. The immediate cause of syncope is cerebral hypoperfusion, which may occur due to systemic vasodilation, decreased cardiac output, or both. The primary classifications of syncope are cardiac, reflex (neurogenic), and orthostatic. Evaluation focuses on history, physical examination (including orthostatic blood pressure measurements), and electrocardiographic results...

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