Stimulation of histamine H1-receptors produces a positive inotropic effect in the human atrium. - Pham TH; Abella LMR; Hadova K; Klimas J; Dhein S; Pockes S; Schlicht JMA; Hofmann B; Kirchhefer U; Neumann J; Gergs U (Naunyn-Schmiedeberg's archives of pharmacology, 2025)