Abstract：
:A simple and sensitive method for the determination of isoprenaline (ISO) in plasma by high performance liquid chromatography (HPLC) with electrochemical detection is presented. Blood pressure and heart rate responses to i.v. infusion of ISO (15, 38 and 76 ng/kg/min) were studied in 15 subjects. Blood samples for ISO analyses were drawn after 7.5 min infusions on each dose level. A four- to six-fold interindividual variation in the venous plasma concentrations of ISO was found. Comparisons were made between estimates of the sensitivity to ISO from concentration-effect and dose-effect curves for both heart rate and diastolic blood pressure responses. Despite an overall correlation between the two methods of estimating ISO sensitivity, individual estimates of sensitivity differed markedly due to the differences in the plasma concentrations attained during infusions of standardized doses of ISO. The venous plasma concentration of ISO required to elevate heart rate by 25 beats/min (CC25) varied between 0.3 and 1.7 nM, whereas the corresponding dose of ISO (CD25) varied between 10 and 27 ng/kg/min.
journal_name
Life Scijournal_title
Life sciencesauthors
Hjemdahl P,Martinsson A,Larsson Kdoi
10.1016/0024-3205(86)90044-5subject
Has Abstractpub_date
1986-08-18 00:00:00pages
629-35issue
7eissn
0024-3205issn
1879-0631pii
0024-3205(86)90044-5journal_volume
39pub_type
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