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学习笔记一引起低血钾的原因之利尿剂

  • 2026-01-10 03:13:27
学习笔记一引起低血钾的原因之利尿剂

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今天在查看生化报告时发现一位90多岁患者,临床诊断是肺部感染,而血钾只有2.87mmol/L,当然是危急值,于是查看了患者近期结果,发现患者近2次结果均是正常的,没有出现低血钾情况,那会不会是临床在治疗过程中引起的呢。

于是打开了患者病例,病例显示:老年男性患者,病程1天,表现为发热,最高体温40℃,伴畏寒、寒战,咳嗽,呈阵发性干咳,无头晕、头痛,无抽搐、惊厥,无恶心、呕吐,无反酸、烧心,无腹痛、腹泻、黑便等不适,遂就诊于我院急诊,完善检查提示血象、CRP、肌钙蛋白、肌红蛋白、BNP升高 ,结合患者3天前我院胸部CT结果,考虑肺部感染,予抗感染、退热、祛痰、补液等对症支持治疗后稍好转,为进一步系统诊治请我科会诊后以“肺部感染”收入我科。xx主任医师查房后指示:针对患者心肌损害及心衰,目前已予托拉塞米及螺内酯,昨日尿量尚可继续利尿,结合专科意见考虑感染所致可能性大,患者长期口服硫酸氢氯吡格雷片、瑞舒伐他汀钙片、苯磺酸氨氯地平片、酒石酸美托洛尔片,继续当前方案,动态监测指标变化。

我们都知道低钾血症是指血清钾 < 3.5 mmol/L 的一种病理状态。而在<3.0 mmol/L时在实验室常把它叫作危急值,钾的缺乏可以引起全身乏力、腹胀、反应迟钝等不适症状及期前收缩等各种心律失常,严重者可发生呼吸衰竭,甚至猝死可能。低钾血症的原因有摄入不足、排出增多和转移性三大类,而在临床上,由药物引起的低钾血症并不少见,且由于涉及药物较多。

当然从病史里不难发现,患者低钾的原因很可能就是由于托拉塞米引起的,因为其主要机制是抑制 Na⁺–K⁺–2Cl⁻ 共转运体,托拉塞米作用于部位肾脏髓袢升支粗段,特异性抑制该段上皮细胞管腔膜上的 Na⁺–K⁺–2Cl⁻ 共转运体(NKCC2)。进而导致 Na⁺、Cl⁻、K⁺ 在该段的重吸收显著减少,大量 Na⁺ 被运送至远端肾单位。

螺内酯是醛固酮拮抗剂,属于“保钾型”利尿剂,作用时虽能排钠排水,但会“留住”体内的钾,不会让钾轻易流失,反而可能因钾排不出去导致“高钾血症”,因此常与排钾利尿剂合用,抵消其低钾副作用,当然更不能和补钾药或其他保钾药随便联用。

托拉塞米属于“排钾型”利尿剂,工作时会帮身体排出多余的钠、水(消肿降压),但同时也会让钾随尿液流失,长期用容易导致“低钾血症”,可能出现乏力、心慌等问题,所以用它时可能需要补钾,或定期监测血钾

关于利尿剂:

1.袢利尿剂代表药物:呋塞米、依他尼酸、布美他尼、托拉塞米机制:抑制髓样升支粗段 Na⁺、K⁺、2Cl⁻ 共同转运体,促进 K⁺–Na⁺ 交换和 H⁺–Na⁺ 交换,尿中 H⁺ 和 K⁺ 排出增多

2.噻嗪类利尿剂代表药物:氢氟喹啉、环戊噻嗪、美托拉奈机制:抑制远曲小管近段的 Na⁺–Cl⁻ 共同转运体,减少 Na⁺、Cl⁻ 的重吸收,促进 Na⁺–K⁺ 交换,K⁺ 排出增多

3.渗透性利尿剂代表药物:甘露醇、山梨醇、高渗糖液机制:间接抑制 Na⁺、K⁺、2Cl⁻ 共同转运体,促进 K⁺–Na⁺ 交换,K⁺ 排出增多

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  1. CONNECT:[ UseTime:0.000906s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001520s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002153s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001246s ]
  6. SELECT * FROM `set` [ RunTime:0.000511s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001441s ]
  8. SELECT * FROM `article` WHERE `id` = 458456 LIMIT 1 [ RunTime:0.014927s ]
  9. UPDATE `article` SET `lasttime` = 1768117994 WHERE `id` = 458456 [ RunTime:0.011851s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.008411s ]
  11. SELECT * FROM `article` WHERE `id` < 458456 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001114s ]
  12. SELECT * FROM `article` WHERE `id` > 458456 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006999s ]
  13. SELECT * FROM `article` WHERE `id` < 458456 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009669s ]
  14. SELECT * FROM `article` WHERE `id` < 458456 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.036090s ]
  15. SELECT * FROM `article` WHERE `id` < 458456 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006531s ]
0.268259s