Pagkakaiba-iba ng ventricular extrasystoles on pangmatagalang ECG ayon sa pag-uuri ng Lown.
| Simpleng ventricular extrasystoles (VES). | |
| Grade 0 | Walang VES |
| Baitang ko | <30 monomorphic VES / h |
| Baitang II | > 30 monomorphic VES / h |
| Komplikadong ventricular extrasystoles (VES). | |
| Baitang IIIa | Polymorphic VES |
| Baitang IIIb | Bigeminus |
| Baitang IVa | Couplets |
| Baitang IVb | Volley |
| Baitang V | R-on T na kababalaghan |
