Results: Q wave amplitude and Q wave numbers recorded in Head-Chest leads were lower than those recorded by Routine lead ECG.

结果：头胸导联所记录到的Q波数及Q波幅度均显著低于常规导联心电图。

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Conclusion The changes on R-ST-T in chest leads is a sensitive and specific predictive marker for diagnosing AHCM, ECG can predicted AHCM early.

结论胸导联心电图r - ST - T变化是诊断AHCM的敏感、特异的预测指标，心电图对AHCM的诊断具有早期预测意义。

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Objective To observe whether the head-chest leads electrocardiogram (HCECG) is better than the routine 12-leads electrocardiogram (RLECG) in different diagnosis of narrow QRS complex tachycardias.

目的观察在窄qrs波心动过速鉴别诊断时，头胸导联心电图是否优于常规12导联心电图。

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They are connected under the skin to another wire that leads to a small battery placed in the chest.

VOA: special.2009.02.03

These reactions cause the airways to become narrower and irritated, which leads to the symptoms of asthma - such as wheezing, shortness of breath and a tight chest.

BBC: NEWS | Health | Overweight 'higher asthma risk'