Aim: Tachyarrhythmias are the most common symptomatic cardiac rhythm disorders in children, with an incidence of approximately 1 in 250–1,000 and possible presentation at any age. This study aimed to present illustrative paediatric cases of supraventricular tachycardia and their short-term follow-up. Materials and methods: Five paediatric patients with supraventricular tachycardia admitted to the Department of Paediatrics at the Multispecialty Hospital in Rybnik between 2021 and 2023 were analysed. Follow-up data were obtained from outpatient evaluations and cardiology records through 2025. Results: Non-pharmacological measures were ineffective in all patients. Intravenous adenosine successfully terminated supraventricular tachycardia in every case: three patients converted after a single dose, and two after a second dose. Longterm management included beta-blockers; one patient required additional flecainide therapy, and one is awaiting catheter ablation. Conclusion: Intravenous adenosine is highly effective for acute termination of supraventricular tachycardia in children, while individualised long-term pharmacological therapy remains essential for rhythm control.