There are multiple definitions:

1. atrial overdrive pacing(English)

   • pacing at 15 bpm above the spontaneous mean nocturnal heart rate. Its role in sleep apnea remains uncertain
   • OSA, HR, n-CPAP
   • Cardiology, Electrophysiology, Therapeutic approaches, Sleep medicine
   • https://doi.org…56/NEJMoa050610

2. artery of Percheron(English)

   • a rare anatomical variant, which supplies bilateral paramedian thalami and the rostral mesencephalon via a single dominant thalamic perforating artery arising from the P1 segment of a Posterior Cerebral Artery (PCA)
   • MRI, PCA
   • Anatomy, Vascular disease
   • https://doi.org…55/2019/1260865

3. adverse outcome pathway(English)

   • Adverse effect

4. ahead of print(English)

   • also denoted as AoP
   • APC, OA
   • Biomedical journals, Medical publications