Early Versus Differed Arterial Catheterization in Critically Ill Patients With Acute Circulatory Failure:

"No indwelling arterial catheter insertion will be allowed during the first 28 days, excepted if predefined safety criteria (indicating absolute need of indwelling arterial catheter insertion) are reached.~In the non-invasive group, automated oscillometric monitor will be used to monitor BP (blood pressure)."

An indwelling arterial catheter will be inserted as soon as possible (within the first four hours after randomization) and will be maintained except in case of indwelling arterial catheter futility, suspected or proven indwelling arterial catheter related infection or thrombosis (at discretion of attending physician) until day 28 or ICU (Intensive Care Unit) discharge (whichever comes first). After day 28, clinicians may choose to maintain or to remove indwelling arterial catheter.