intensive care 
noun [mass noun]
Special medical treatment in which a patient who is dangerously ill is kept under constant observation, typically in a dedicated department of a hospital: the baby survived in intensive care he was in a critical condition and needed intensive care...
- He created joint chairs for both anaesthesiology and intensive care at all Soviet medical schools.
- High risk obstetrics and neonatal intensive care are high cost, low volume specialties.
- The patient was immediately taken off the medication and given intensive care.