Table 2.

Effect of dopamine or dopamine receptor agonists on voltage-activated Ca²⁺ current and Ca²⁺ influx

		Increase (no. of cells)	Decrease (no. of cells)	No change (no. of cells)	Average changes (means ± s.e.m.)	P value
Dopamine	Current	2	16 (73%)	4	−56.8 ± 11.0%	< 0.05
	Influx	4	19 (63%)	7	−32.7 ± 6.4%	< 0.001
SKF	Current	3	8 (62%)	2	−53.8 ± 9.7%	0.06
	Influx	0	16 (73%)	6	−34.0 ± 8.3%	< 0.001
Quinpirole	Current	0	1	6 (86%)	−4.2 ± 5.7%	n.s.
	Influx	1	2	8 (73%)	−1.9 ± 3.46%	n.s.

SKF, SKF 38393. P values were obtained from the paired t test to compare the means before and after dopamine or dopamine receptor agonist treatment.