article · Global Cardiology Science and Practice
Quinine remains a critical treatment for malaria in resource-limited environments, acting primarily via sodium-channel blockade with modest inhibition of the rapid delayed-rectifier potassium current. While safe across general populations, this modest inhibition can trigger life-threatening Torsade de Pointes in individuals with severely depleted repolarisation reserves. An eight-year-old patient receiving intravenous quinine for severe malaria developed profound QTc prolongation and recurrent Torsade de Pointes on the third day of treatment. The cardiac event stemmed from the combined effects of quinine therapy, hypokalaemia, and an unrecognised pathogenic KCNH2 variant. This severe electrical instability unmasked latent Long QT Syndrome type 2, necessitating long-term beta-blocker treatment and cascade screening for family members. The findings demonstrate the vital role of electrocardiogram monitoring and electrolyte correction when administering quinine, illustrating how pharmaceutical triggers can reveal silent genetic conditions.
Common treatments can become dangerous when combined with unseen genetic traits and electrolyte imbalances. This work shows how routine malaria therapy can suddenly trigger severe heart rhythm disturbances in vulnerable individuals. It underscores the practical importance of basic clinical monitoring, such as tracking heart rhythms and blood potassium levels, to prevent sudden cardiac death in resource-limited settings.
The abstract does not indicate an application pathway, as it reports a single clinical case rather than a commercial product or technology.
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Quinine, a Cinchona alkaloid and a cornerstone of malaria therapy in resource-limited settings, produces predominant sodium-channel blockade alongside modest inhibition of the rapid delayed-rectifier potassium current (IKr). Although generally safe at the population level, even modest IKr blockade can precipitate life-threatening Torsade de Pointes (TdP) in patients with severely impaired repolarization reserve. We report an 8-year-old boy with severe Plasmodium falciparum malaria who, on the third day of intravenous quinine, developed profound QTc prolongation (730 ms) followed by recurrent TdP. This arose from the convergence of quinine-induced IKr inhibition, hypokalaemia (K 2.9 mmol/L), and an underlying pathogenic KCNH2 variant, which together exhausted repolarization reserve. Although initially haemodynamically stable, the patient's extreme electrical instability proved a sentinel event, prompting identification of latent Long QT Syndrome type 2 (LQT2). The case highlights the importance of ECG monitoring and electrolyte correction during quinine therapy. It illustrates how drug-induced arrhythmia can represent the phenotypic unmasking of diminished repolarization reserve, in which a pharmacological trigger exposes a silent genetic substrate—here necessitating lifelong beta-blocker therapy and family cascade screening to prevent sudden cardiac death.
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DOI: 10.21542/gcsp.2026.36
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