The principle and main function of dynamic ECG

Time : 2023-07-01

Dynamic electrocardiogram, also known as "DCG". It is different from ordinary electrocardiograms, and doctors will advise patients to do dynamic electrocardiograms when necessary. This is because the dynamic electrocardiogram has functions that ordinary electrocardiograms do not have. Next, what I want to introduce to you is the principle and main function of dynamic electrocardiogram.


The principle of dynamic electrocardiogram:

The dynamic electrocardiogram can continuously record the electrocardiogram for 24 hours or longer, with about 80,000 to 140,000 heartbeats. Usually, the electrocardiogram we do usually only records the electrocardiogram of only ten seconds in the supine state, and records a dozen heartbeats. The amount of information is small, and for intermittent attacks of angina pectoris or arrhythmia, it is difficult to capture the waveform of the attack in a short period of time, which may easily lead to missed diagnosis. Therefore, when a patient has intermittent symptoms, such as palpitations, syncope, chest pain, chest tightness, etc., or has no obvious discomfort, but has a transient ECG abnormality, it is recommended to do dynamic ECG examination and observe the 24-hour ECG for clinical diagnosis and treatment. Provide evidence.

The dynamic electrocardiogram machine is mainly composed of 3 parts, namely recorder, analysis unit and printer. The recorder is divided into solid-state type and magnetic tape type. The solid-state recorder is made of large-scale integrated circuits, and the graphic information is stored on a small chip. After the recording is completed, it will be analyzed, edited, diagnosed and printed by the analysis unit.

Some recorders themselves have analysis functions, which can save the working time of the analysis unit; another kind of recorder is a tape recorder, which is very similar to a small tape recorder, but it is not the same. First, it only records ECG signals. The second is that its tape running speed is extremely slow, only 1/50 of the ordinary tape recorder, and the 24-hour ECG signal is only recorded on an ordinary tape, and there is no need to change the tape. After the recording is completed, it is put into the analysis unit for further analysis Analyze, edit and print reports. At present, the latest recorder generally adopts a large-capacity CF card or SD card, which can guarantee continuous recording of Holter ECG data for up to 7 days in 24 hours.

The role of dynamic electrocardiogram:

Detect occult arrhythmia: short-term arrhythmia that will appear under specific circumstances, conventional ECG is easy to miss diagnosis, and DCG can capture short-term abnormal ECG changes to understand the origin of arrhythmia. The duration, frequency, occurrence and termination rules can be used to analyze the relationship with clinical symptoms and daily activities.

Monitoring tachyarrhythmia: can further understand its occurrence and termination rules. Whether accompanied by SSS syndrome or pre-excitation syndrome.

Observation of bradyarrhythmia: understanding its main manifestations and presence or absence of sinus node insufficiency. For fast-slow syndrome, through DCG observation, assist in the selection of antiarrhythmic drugs, adjust the dose or consider other treatment methods, and provide objective basis for the installation of pacemakers and the selection of types.

Assist in judging the clinical significance of different types of ectopic rhythm or conduction block: monitor the frequency and severity of its occurrence through DCG, and the corresponding relationship with life or activities to determine the treatment policy.

Evaluation of the efficacy of antiarrhythmic drugs: DCG is a reliable clinical index for research and evaluation of antiarrhythmic drugs.