0001831868 2026-06-17 2026-06-17 0001831868 icu:CommonStockCustomMember 2026-06-17 2026-06-17 0001831868 icu:WarrantsCustomMember 2026-06-17 2026-06-17 false 0001831868 8-K 2026-06-17 SeaStar Medical Holding Corporation DE 001-39927 85-3681132 3513 Brighton Blvd, Suite 410 Denver CO 80216 844 427-8100 false false false false Common Stock ICU NASDAQ Warrants ICUCW NASDAQ true false