Use of alteplase from 4.5 to 9 hours in patients with ischemic stroke but with salvageable brain on perfusion imaging was superior to placebo (aRR 1.44, 95%CI 1.01-2.06; NNT = 17). Symptomatic hemorrhage was more common in the alteplase group.
In this systematic review and meta-analysis, no single aspect of the physical examination, imaging, or LRINEC score had high enough sensitivity to exclude necrotizing soft tissue infections. Contrast CT performed the best, but it was only 94.3% sensitive at best. If you have a high clinical suspicion, early surgical consultation is necessary for definitive diagnosis and management.
In this retrospective review, age-adjusted, clinical probability-adjusted, and standard D-dimer approaches had similar NPVs (99.7%, 99.1%, 100% respectively). Clinical probability-adjusted D-dimer has potential to exclude PE in more patients without imaging, but use caution before applying this to practice until prospectively validated.