An intensive care unit (Portuguese: unidade de cuidados intensivos) is a specialised hospital ward that provides close monitoring and life-sustaining treatment for critically ill patients using advanced equipment and highly trained staff. ICU capacity is frequently mentioned because it signals how many severe patients a health system can care for — when ICUs are full, hospitals may delay surgeries, limit admissions or transfer patients, so expats should check insurance and hospital policies for critical-care coverage and visitation rules.