Table 2.
Magnetocardiographic Indexes in Detection of Healed MI
| All MI | P Value | NQMI | P Value | QMI | P Value | Controls | |
|---|---|---|---|---|---|---|---|
| QRS area (pTs) | 15.0 ± 5.7 | 0.042 | 13.5 ± 4.6 | n.s. | 16.0 ± 6.7 | 0.044 | 11.0 ± 3.7 |
| QRS integral (pTs) | 4.5 ± 4.8 | n.s. | 3.9 ± 0.5 | n.s. | 5.2 ± 6.6 | n.s. | 4.3 ± 2.8 |
| ST integral (pTs) | −1.0 ± 1.8 | n.s. | −0.5 ± 1.7 | n.s. | −1.5 ± 1.8 | 0.037 | −0.3 ± 1.2 |
| T integral (pTs) | −0.4 ± 4.0 | n.s. | 0.4 ± 4.4 | n.s. | −1.4 ± 3.5 | n.s. | 1.7 ± 3.6 |
| ST‐T integral (pTs) | −1.4 ± 5.3 | n.s. | −0.09 ± 6.0 | n.s. | −2.8 ± 4.4 | 0.034 | 1.5 ± 4.7 |
| QRS‐ST discordance (pTs) | 15.5 ± 6.6 | n.s. | 14.0 ± 5.7 | n.s. | 17.0 ± 7.4 | 0.009 | 11.0 ± 3.9 |
| QRS‐T discordance (pTs) | 13.1 ± 8.7 | 0.004 | 11.0 ± 9.2 | n.s. | 15.0 ± 8.0 | 0.001 | 5.9 ± 6.2 |
| QRS‐ST‐T discordance (pTs) | 13.9 ± 10.0 | 0.003 | 11.5 ± 11.0 | n.s. | 16.5 ± 9.3 | 0.001 | 5.0 ± 7.1 |
| QRS angle (degrees) | 111 ± 95 | n.s. | 134 ± 115 | n.s. | 87 ± 64 | n.s. | 106 ± 93 |
| ST‐T angle (degrees) | 163 ± 119 | 0.006 | 110 ± 107 | n.s. | 220 ± 110 | <0.001 | 58 ± 17 |
| QRS‐ST‐T angle (degrees) | 72 ± 62 | n.s. | 52 ± 61 | n.s. | 94 ± 59 | 0.011 | 38 ± 46 |
The values are sums of MI parameters of all channels over the mapped region. Statistical comparisons are made between the MI, QMI, and NQMI patient groups and the control group.
P‐values comparing the patient group to the control group; Mann‐Whitney U test. Mean ± standard deviation. MI = myocardial infarction; NQMI = non‐Q wave myocardial infarction; QMI = Q wave myocardial infarction.