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Proton pump inhibitors (PPIs) can cause low magnesium levels (hypomagnesaemia), leading to serious side effects like arrhythmias. Monitoring magnesium is crucial for patients on long-term PPI therapy.

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Area of Science:

  • Pharmacology
  • Clinical Medicine
  • Biochemistry

Background:

  • Proton pump inhibitors (PPIs) revolutionized acid-related disorder treatment since the late 1980s.
  • While effective and generally safe, long-term PPI use is associated with potential adverse effects.
  • Hypomagnesaemia is an under-recognized side effect of chronic PPI therapy.

Observation:

  • A case report details a 73-year-old woman presenting with supraventricular tachycardia.
  • The patient's tachycardia was attributed to hypomagnesaemia induced by lansoprazole, a PPI.
  • Arrhythmia resolved with intravenous magnesium, and normalized serum magnesium levels were maintained after PPI discontinuation.

Findings:

  • Long-term proton pump inhibitor therapy can lead to clinically significant hypomagnesaemia.
  • Hypomagnesaemia may manifest as cardiac arrhythmias, such as supraventricular tachycardia.
  • Discontinuation of PPIs can restore normal magnesium levels, resolving associated symptoms.

Implications:

  • Increased clinical awareness and diagnostic attention are needed for PPI-induced hypomagnesaemia.
  • Routine serum magnesium monitoring should be considered in patients on long-term PPIs, especially if they present with unexplained illness or arrhythmias.
  • This highlights the importance of vigilant patient monitoring for potential adverse drug reactions during long-term medication use.