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Haemodynamic instability secondary to cardiac involvement by lymphoma. Cardiac involvement in lymphomas is not uncommon, but it is often missed due to the variability in its presentation. We present a case of bradycardia and complete heart block resulting in haemodynamic instability in a patient with recurrent diffuse large B-cell lymphoma. Timely diagnosis and appropriate management of such patients is crucial and requires a high index of suspicion. Our patient required temporary pacemaker implantation and intravenous corticosteroid therapy. His complete heart block and bradycardia eventually resolved after a course of radiation therapy.