HTR2A and myocardial infarction: Colleagues in Norway confirmed this work and extended it by showing that in failing rat hearts (due to aortic banding or experimentally induced myocardial infarction) in addition to a 5-HT2-receptor mediated PIE also a 5-HT4-receptor mediated PIE of serotonin occurred accompanied by increased expression of the mRNA for the 5-HT4-receptor (reviewed in: Levy et al., 2008).