1. An irregular heartbeat; a condition in which the heart beats too fast, too slow, or in an irregular pattern
The patient was diagnosed with cardiac arrhythmia after presenting with palpitations and dizziness.
O paciente foi diagnosticado com arritmia cardíaca após apresentar palpitações e tontura.
2. Any deviation from the normal rhythm of the heartbeat
The ECG revealed a cardiac arrhythmia that required immediate treatment.
O ECG revelou uma arritmia cardíaca que exigia tratamento imediato.