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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: J Hypertens. 2011 Feb;29(2):251–256. doi: 10.1097/HJH.0b013e3283407ffd

Table 4.

Comparison of dexmedetomidine ED50 in quartiles of phenylephrine ED50

Phenylephrine
ED50 quartile
1st quartile
(lowest
quartile)
2nd quartile 3rd quartile 4th quartile
(highest
quartile)
P-
value
Dexmedetomidine ED50 (ng/min, median, IQR) 0.64 (0.30–1.89) 3.23 (0.26–34.57) 1.20 (0.43–5.08) 1.63 (0.52–9.48) 0.22

ED50 - The dose of phenylephrine and dexmedetomidine that produced 50% of maximum venoconstriction (Emax) for each subject