電解質(zhì)與心律失常關(guān)系(文件)
【正文】 140 msec. ? These findings are characteristic of hyperkalemia. It is well known that hyperkalemia can cause STsegment elevation (pseudoinfarction pattern or dialyzable current of injury). ? This tracing is from a patient with a serum potassium level of mEq/L during diabetic ketoacidosis, who also is in renal failure and taking an angiotensinconverting enzyme inhibitor 尿毒癥高鉀 竇室傳導(dǎo) 竇室傳導(dǎo) ECG表現(xiàn)： QRST序列 Hypocalcemia and hyperkalemia ? Hypocalcemia and hyperkalemia is correct. ? Discussion ? The QT interval is long. When the long QT interval is due to a long ST segment with a delayed onset of the T wave, it is specific for hypocalcemia. Besides, the T waves are tall, narrow, and pointed and are highly suggestive of hyperkalemia. This bination of electrolyte problems is mon in patients with chronic renal failure, which this patient has. The serum potassium level was mEq/L and calcium mg/dL at the time. ? Hypokalemia is correct. ? Discussion ? In leads V13, the T waves are shallowly inverted and are followed by a prominent U wave. These findings are highly suggestive of hypokalemia. The serum potassium was mEq/L at the time. 低血鉀的 ECG表現(xiàn) 低鉀 +奎尼丁： Tdp Thanks 。 不應(yīng)期 + + 閾電位 應(yīng)激性 + + —————————————————————————————— 高鉀血癥 （ ） 心電圖表現(xiàn) ? T波高尖 ? QRS波振幅降低、時(shí)間變寬、 S波加深 ? ST段下移 ? P波減小，甚至消失 ? 各種心律失常（緩慢為主） ? 竇緩、竇性靜止； ? 傳導(dǎo)阻滯：房?jī)?nèi)、房室、室內(nèi) ? 交界區(qū)心動(dòng)過(guò)速、 心室自主心律、 室顫 、心室停搏 高鉀血癥 心電圖異常機(jī)制 ? 對(duì)動(dòng)作電位復(fù)極的影響（ ) ? 細(xì)胞膜對(duì)鉀離子的通透性 ?3相復(fù)極縮短，坡度陡峻： ? T波高尖 ? QT縮短 ? 對(duì)靜息電位及動(dòng)作電位除極的影（ ) ? 細(xì)胞內(nèi)外鉀濃度差 ? ? ? 膜電
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