What is an intensivist?

What is an intensivist?
A physician who specializes in the treatment of critically ailing patients.
There are Board certifications in Critical Care Medicine, and doctors from multiple specialties can become certified. Pulmonologists, anesthesiologists. surgeons, pediatricians and internists (among others) can choose to specialize in critical prudence.
A physician who specializes in the contemplation of critically ill patients
An intensivist is a qualified specialist physician who have training in critical diligence medicine who provides energy support or organ support systems and manages critically under the weather patients in intensive thought units. It is a specialty that requires further training or fellowship after the primary residency training. Thus an intensivist works contained by ICU (intensive care unit) but not adjectives doctors working in ICU are intensivist.