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临床上电解质紊乱最常见的是血钾改变,血钾异常中以低血钾较为多见,如不及时纠正后果也较严重。低血钾可使心脏产生形态学损害,很易导致心脏功能紊乱及心律失常。低血钾所引起的心律失常随着血钾含量的降低有其一定的发展规律,但因为心肌各部位组织对血钾浓度变化的敏感性不同,就是同一患者也随着疾病的性质与严重程度,迷走神经和交感神经的功能状况,血液中其他电解质浓度的变化而改变,因此同样的血钾浓度,心电图变化不一定相同。低血钾时心电图的特点如下:①u 波增高是低血钾最早出现的心电图特征,测定 u 波与 T 波的振幅比率比之测定 u 波本身的高度更有意义。u 波增高常重叠在 T 波顶峰之后,使T 波呈双峰 T 波,提示低钾可能。若患者原有 T 波较
Clinical electrolyte imbalance is the most common change in blood potassium, potassium hypokalemia is more common in abnormal, if not promptly corrected the consequences are more serious. Hypokalemia can cause morphological damage to the heart, it is easy to lead to cardiac dysfunction and arrhythmia. Hypokalemia caused by arrhythmia with the decline of serum potassium has its certain developmental rules, but because of different parts of the myocardium on the sensitivity of serum potassium concentration is different, is the same patient with the nature and severity of the disease Vaginal and sympathetic functional status, changes in the concentration of other electrolytes in the blood, so the same serum potassium concentration, ECG changes are not necessarily the same. Hypokalemia ECG characteristics are as follows: ① u wave increased potassium hypokalemia is the earliest ECG characteristics, u wave and T wave amplitude ratio than the determination of u-wave height more meaningful. u wave often overlap in the T wave peak after the T wave was bimodal T wave, suggesting that low potassium may. If the original T wave patients