CRP and obstructive sleep apnea syndrome: From this chart, we can discern that the keyword themes have progressively transitioned from “sleep apnea,” “size,” and “C-reactive protein” to more recent themes such as “structural changes,” “inflammation,” “diagnosis,” and “mechanisms.” This suggests that the correlation between obstructive sleep apnea syndrome and aspects such as maxillofacial changes, imaging diagnosis, and pathological mechanisms is the central focus of both current and anticipated future research in this field.