PORTLAND, Ore. (KATU) — A Portland man is seeking nearly $534 million in damages in a lawsuit that alleges Kaiser Permanente and several doctors failed to properly diagnose and treat his heart condition, leading to a cardiac arrest and life-altering injuries, including the amputation of both legs.
The lawsuit, filed Aug. 21, 2026, was brought by Portland attorney Mark Johnston on behalf of plaintiff Mathew Williamson. It alleges “negligence and recklessness” by the defendants caused Williamson to suffer cardiac arrest and severe complications, including “above knee amputation of both of Matthew’s legs,” fasciotomies on both arms with “severe loss of function,” and other medical complications.
According to the complaint, Williamson had a history of cardiac issues that required constant monitoring by cardiac providers, including a history of AV block that “progressively worsened over time.” The lawsuit says health care providers started him on metoprolol, and alleges the medication “is not appropriate for those with serious AV block.” The complaint further alleges that if metoprolol is used with a patient with serious AV block, “then a pacemaker is necessary.”…