Hello,
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ICU nurse in means they are called as ICU staff who are only responsible for ICU patient's who needs a very sensitive care. They are the staff who has experience for treating patients.
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Now In average ICU staff salary will be in-between 20k to 25k per month
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To be a ICU nurse you should have diploma in critical care nursing whose Eligiblity is a candidate must be a degree of post graduate holder  in BSC nursing. Duration of the  course is 1 year