| ACh | Acetyl-choline |
| gNa | Conductance of INa |
| INa | Fast sodium current |
| Inet | Net membrane current |
| Ipst | Persistent, non-inactivating component of INa |
| Iso | Isoprenaline |
| LQT3 | Long-QT syndrome type 3 |
| LQTS | Long QT syndrome |
| NaV1.5 | Pore-forming α-subunit of the cardiac voltage-gated sodium channel |
| SCN5A | Gene encoding the NaV1.5 protein |
| Vm | Membrane potential |
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