# Supraventricular Tachycardia as an Initial Manifestation of Malignancy-Related Cardiac Invasion: A Case Report

## TL;DR

A rare case where a lung cancer spread to the heart, causing a dangerous heart rhythm, highlights the need for early detection in cancer patients.

## Contribution

This case report highlights the rare presentation of malignancy-related cardiac invasion as an initial manifestation of supraventricular tachycardia.

## Key findings

- A 66-year-old male with lung cancer developed supraventricular tachycardia due to cardiac invasion.
- Echocardiography and CT imaging confirmed left atrial and pericardial infiltration by a necrotic lung mass.
- Early diagnosis of cardiac invasion in cancer patients is crucial to prevent life-threatening arrhythmias.

## Abstract

Cardiac tumors are exceedingly rare, with metastatic lesions occurring more frequently than primary tumors. These tumors generally present with non-specific symptoms, reflecting tumor location and invasion of adjacent structures, and diagnosis is frequently incidental. A 66-year-old male smoker presented with hemoptysis and weight loss. Echocardiography revealed external invasion and compression of the left atrium by a left lung mass. His hospital course was complicated by recurrent supraventricular tachycardia (SVT). CT imaging showed a necrotic lung mass infiltrating the left atrium and pericardium, and biopsy confirmed invasive pulmonary adenocarcinoma. Atrial tachyarrhythmias via direct malignancy-related cardiac infiltration as an initial presentation of cancer are exceedingly rare and can significantly delay diagnosis and treatment due to vague symptoms. However, this entity can lead to life-threatening arrhythmia, underscoring the importance of early diagnosis and management. This case highlights the importance of considering malignancy-related cardiac invasion in patients with underlying malignancy with new-onset arrhythmias, as with our case with pulmonary adenocarcinoma and potentially life-threatening SVT through direct pericardial and atrial infiltration and involvement.