| ANOVA | Analysis of variance |
| DCPIB | 4-[(2-butyl-6,7-dichloro-2-cyclopentyl-2,3-dihydro-1-oxo-1H-inden-5-yl)oxy] butanoic acid |
| HCM | Human cardiac myocytes |
| HCQ | Hydroxychloroquine |
| I h | Hyperpolarization-activated cation current |
| I K(DR) | delayed-rectifier K+ current |
| I K(erg) | erg-mediated K+ current |
| I Na | voltage-gated Na+ current |
| I PAC | proton-activated Cl− current |
| KV | voltage-gated K+ channel |
| PAC channel | proton-activated Cl− channel |
| PGG | pentagalloylglucose (penta-O-galloyl-β-D-glucose) |
| SEM | standard error of the mean |
| TEA | tetraethylammonium chloride |