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Table 1 Mean ± SD of monophasic action potential amplitude and repolarization level of 90% (APD90), and effective refractory periods (ERP) measured at rest and at a pacing cycle length of 1000 and 600 ms in the right atrium and right ventricle

From: Measurement variability of right atrial and ventricular monophasic action potential and refractory period measurements in the standing non-sedated horse

 

Right atrium

Right ventricle

Mean ± SD

Mean ± SD

Day 1

Day 2

Overall

Cv %

Day 1

Day 2

Overall

CV %

amplitude (rest) (mV)

6.9 ± 1.9

4.4 ± 1.9

5.7 ± 2.3

35.6

9.1 ± 4.3

7.2 ± 3.3

8.1 ± 3.8

49.2

amplitude (1000) (mV)

6.0 ± 2.0

4.0 ± 1.0

5.0 ± 2.0

44.0

7.8 ± 2.6

8.8 ± 5.4

8.3 ± 4.0

58.9

amplitude (600) (mV)

6.0 ± 1.0

6.0 ± 2.0

6.0 ± 2.0

37.3

7.7 ± 2.5

9.7 ± .8

8.7 ± 4.4

65.5

APD90 (rest) (ms)

282 ± 41

244 ± 29

263 ± 39

9.1

464 ± 30

469 ± 15

467 ± 23

6.2

APD90 (1000) (ms)

281 ± 47

243 ± 23

262 ± 41

12.3

399 ± 38

443 ± 24

421 ± 38

7.3

APD90 (600) (ms)

242 ± 17

231 ± 67

236 ± 47

21.6

325 ± 26

319 ± 34

322 ± 29

5.6

ERP1000 (ms)

269 ± 18

277 ± 31

273 ± 24

7.9

401 ± 34

370 ± 43

386 ± 40

11.8

ERP600 (ms)

251 ± 14

261 ± 28

256 ± 22

6.5

295 ± 38

291 ± 23

293 ± 30

9.6