Cystic fibrosis heterozygotes have normal autonomic innervation of the heart

Five simple tests of autonomic nerve function based on measurements of cardiovascular responses to various stimuli were used to investigate possible autonomic dysfunction in obligate heterozygotes for cystic fibrosis. There were no significant differences between the heterozygotes and control groups in any of the tests, suggesting that cystic fibrosis heterozygotes have normal autonomic innervation of the heart.