It makes sense to treat an allergic reaction with an antihistamine.  This study suggests that treating patients with an allergic reaction with a H1-antagonist may decrease the chance of disease progression to anaphylaxis, though the level of evidence is weak.

Older patients taking antiplatelet agents, including aspirin 81mg, or anticoagulants have tSAH about 3.5% of the time with simple ground level fall.

There was an association with short-term steroid use and several adverse outcomes.

Pay attention to discharge vitals, especially in patients over age 65; they predict bouncebacks.

NEXUS was not as sensitive in patients older than 65.  These people need imaging.

A great way to estimate the weight of an adolescent or adult is this formula.  Weight (kg) = 4 x MAC (cm) - 50.  MAC = mid-arm circumference

The San Francisco Syncope Rule could safely reduce almost one-quarter of admissions for syncope in this cohort.  But later studies found the diagnostic performance to be lower.

Have a lower admission threshold for elderly patients with purulent skin infection.  They are more likely to fail initial ED treatment than younger patients.

Procalcitonin predicted the risk for subsequent intubation or pressors in adults with community-acquired pneumonia.

ED visits solely for hypertension have very low adverse events rates shortly after ED discharge.