This is the 18397th most frequent Russian word.
электрокардиография
Electrocardiography: the process of recording the electrical activity of the heart.
In this sentence, 'электрокардиография' is used to describe the medical procedure that doctors use to study heart health.
Электрокардиография позволяет врачам анализировать состояние сердца пациентов.
Electrocardiography allows doctors to analyze the condition of patients' hearts.
Here, 'электрокардиография' refers to the process that requires specific technical apparatus to execute.
Для проведения электрокардиографии необходимо специальное оборудование.
Special equipment is necessary to perform electrocardiography.
In this context, 'электрокардиография' denotes the subject matter that students learn about academically.