Table 4. Summary data of the effect BaCl2.
| A No Depolarization with 100 µM BaCl2 (n = 13) | ||||
| Control | BaCl2 (50 µM) | BaCl2 (100 µM) | BaCl2 (500 µM) | |
| Spontaneous Rate (bpm) | 62.7±27.7 | 67.7±23.5 | 68.5±24.9 | 85.3±23.9 |
| AP amplitude (mV) | 101.5±10.9 | 100.1±11.2 | 99.3±11.0 | 88.8±12.2a |
| MDP (mV) | −68.2±8.1 | −67.2±8.8 | −66.9±8.9 | −60.0±9.3b |
| V/max (V/sec) | 21.8±17.5 | 21.5±17.3 | 21.0±16.4 | 12.2±10.7 |
| APD90 (msec) | 238.2±57.4 | 263.2±60.4 | 266.0±57.3 | 263.2±50.1 |
| APD50 (msec) | 176.5±46.9 | 186.2±47.8 | 189.6±48.2 | 178.8±41.0 |
| Bazett’s-APD90 (msec) | 231.0±59.1 | 269.1±50.8 | 273.4±47.7 | 305.5±40.8d |
| Hodge’s-APD90 (msec) | 238.2±57.4 | 263.2±60.4 | 266.0±57.3 | 263.2±50.1 |
| Friederica’s-APD90 (msec) | 231.9±52.3 | 266.2±50.0 | 270.0±46.7 | 290.1±39.8a |
| Framingham-APD90 (msec) | 238.2±57.4 | 263.2±60.3 | 266.0±57.3 | 263.3±50.1 |
| APD50/APD90 (RO) | 0.74±0.07 | 0.71±0.09 | 0.71±0.08 | 0.68±0.10 |
| APD30–40/APD70–80 (RO) | 1.7±1.4 | |||
| B Depolarization with 100 µM BaCl2 (n = 9) | ||||
| Control | BaCl2 (50 µM) | BaCl2 (100 µM) | BaCl2 (500 µM) | |
| Spontaneous Rate (bpm) | 74.9±31.9 | 69.4±20.5 | 76.2±31.3 | 73.0±18.3 |
| AP amplitude (mV) | 100.0±14.6 | 94.8±14.8 | 89.6±16.1 | 76.1±14.7a |
| MDP (mV) | −65.4±11.1 | −62.0±11.9 | −57.8±12.8 | −46.9±14.7a |
| V/max (V/sec) | 33.8±12.0 | 27.0±15.6 | 20.7±10.6c | 5.8±2.1c |
| APD90 (msec) | 242.6±64.0 | 280.0±62.5 | 276.0±46.3 | 274.3±42.0 |
| APD50 (msec) | 152.9±61.9 | 160.5±48.6 | 159.8±45.4 | 160.1±23.3 |
| Bazett’s-APD90 (msec) | 257.6±61.8 | 298.0±73.6 | 302.9±72.3 | 297.5±37.9 |
| Hodge’s-APD90 (msec) | 242.7±63.9 | 280.0±62.5 | 276.1±46.3 | 274.4±41.9 |
| Friederica’s-APD90 (msec) | 251.4±58.3 | 291.3±66.8 | 292.3±56.1 | 289.1±35.1 |
| Framingham-APD90 (msec) | 242.6±63.9 | 280.0±62.5 | 276.0±46.3 | 274.3±41.9 |
| APD50/APD90 (RO) | 0.65±0.21 | 0.60±0.19 | 0.59±0.15 | 0.59±0.10 |
| APD30–40/APD70–80 (RO) | 1.1±0.5 | |||
Summarized data of the effect of 50, 100 and 500 µM BaCl2 on two populations of BC sorted out by their response to depolarize or not in response to 100 µM BaCl2. A, BC that did not depolarize (n = 13); B, BC that depolarized (n = 9). Values are means ± SD. a p<0.05 vs. Control; b p<0.05 vs. B; c p<0.001 vs. Control; d: p<0.01 vs. Control.