0001831868 2026-06-25 2026-06-25 0001831868 icu:CommonStockCustomMember 2026-06-25 2026-06-25 0001831868 icu:WarrantsEachWholeWarrantExercisableForOneShareOfCommonStockFor1150PerShareCustomMember 2026-06-25 2026-06-25 false 0001831868 8-K 2026-06-25 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, each whole warrant exercisable for one share of Common Stock for $11.50 per share ICUCW NASDAQ true false