Aortic dissection saw 44x more Wikipedia readers than usual

What this article is

Aortic dissection (AD) occurs when an injury to the innermost layer of the aorta allows blood to flow between the layers of the aortic wall, forcing the layers apart. In most cases, this is associated with a sudden onset of agonizing chest or back pain, often described as "tearing" in character. Vomiting, sweating, and lightheadedness may also occur. Damage to other organs may result from the decreased blood supply, such as stroke, lower extremity ischemia, or mesenteric ischemia. Aortic dissection can quickly lead to death from insufficient blood flow to the heart or complete rupture of the aorta.

Summary text from the Wikipedia article "Aortic dissection", available under CC BY-SA 4.0. Read the full article.

Where editors were working

Wikipedia editors made 6 edits to this article on 2026-07-13, concentrated in these sections. This is evidence about the surge, not an explanation of it.

• Predisposing factors
• Aortic insufficiency

What changed that day

The article grew by 691 characters that day. The largest single addition was 633 characters to Predisposing factors. See everything that changed on 2026-07-13 in Wikipedia's own diff view — that is where the reason for a surge is usually visible, written and sourced by the editors who were following the story.

How this was measured

Views are Wikimedia's own pageview counts for en.wikipedia, filtered to agent=user so automated traffic is excluded. The baseline is the median of the previous 60 days, which is used instead of the mean so that an earlier surge cannot flatten a later one. The multiple is the day's views divided by that median.