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Effect of endothelin-1 (ET-1 0.1 and 1 nM), [βAla8] NKA 4-10 (3 and 30 nM) and histamine (0.1 and 1 μM) on EFS standard induced contraction (a stimulus frequency that induced a 30% of contraction induced by an EFS on 30 Hz) in human isolated bronchial rings. Values are per cent of contraction induced by an EFS of 30 Hz. *P<0.05, **P<0.01 compared to control values. Data are expressed as the means±s.e.mean from eight preparations.
