Premium
Cardiovascular dynamics after acute and long‐term alpha‐ and beta‐ adrenoceptor blockade at rest, supine and standing, and during exercise.
Author(s) -
Koch G
Publication year - 1979
Publication title -
british journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.216
H-Index - 146
eISSN - 1365-2125
pISSN - 0306-5251
DOI - 10.1111/j.1365-2125.1979.tb04762.x
Subject(s) - supine position , beta (programming language) , rest (music) , medicine , blockade , alpha (finance) , beta adrenoceptor , adrenergic beta antagonists , cardiology , adrenergic receptor , propranolol , surgery , receptor , computer science , construct validity , patient satisfaction , programming language
1 After acute intravenous administration labetalol reduced mean values for BP, total peripheral resistance, heart rate and cardiac output. All changes were more pronounced during bicycle exercise. 2 After a mean duration of 20 months' treatment with oral labetalol the haemodynamic findings were broadly similar except for a more marked reduction in the total peripheral resistance and cardiac output had returned to pretreatment level due to an increased stroke volume which had counter balanced the reduction in heart rate. These changes occurred at rest, in the erect position and during exercise but the reductions in BP and peripheral resistance were most marked during exercise. 3 Left ventricular filling pressures and stroke volume/filling pressure ratios were not significantly altered after intravenous labetalol compared with pretreatment values. 4 Systolic BP x heart rate product was lowered particularly during exercise after both intravenous and oral labetalol. 5 After long‐term oral labetalol, the most striking haemodynamic change was in the elevated resting stroke volume supine and standing.