The goal of this observational study is to learn whether different doses of various vasopressor drugs influence capillary refill time (CRT) value in crtically ill patients. The main questions it aims to answer are: * How do vasopressor drugs determine CRT value * How does mean arterial pressure (MAP) determine CRT value * How often CRT value is normal (\< 3 sec) despite hypotensive MAP (\<65 mmHg) Participants will have the CRT measured over the course of the ICU hospitalization. At the end of the study, multiple linear regression will be performed to verify whether different doses of vasopressor drugs influence CRT value.
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Effect of norepinephrine dose on CRT value
Timeframe: Through study completion, an average of 1 year
Effect of mean arterial pressure on CRT value
Timeframe: Through study completion, an average of 1 year