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The mystery of R-wave progression: Why can the ECG change suggest heart disease?
The heart is one of the important organs of the human body, and electrocardiogram (ECG or EKG) is a key tool for diagnosing heart health.Among them, the QRS wave group, as the most significant part of the electrocardiogram, reflects the depolarization of the ventricle and the contraction of the heart's large muscles.Understanding the changes in QRS populations is crucial to identifying potential heart disease.
Composition of QRS wave group
QRS wave group consists of three graphical offsets, namely Q wave, R wave and S wave.Under normal circumstances, the QRS cluster duration is 80 to 100 milliseconds.In adults, the Q wave is a downward offset followed by an ascending R wave and finally a downward S wave.The emergence of these waves may not be visible on all leads, but they reflect a common event.
Child disease diagnosis and QRS wave group
The depolarization of the heart occurs almost simultaneously, transmitting signals through the His bundle and Purkinje fibers.If these systems work well, the QRS cluster duration in adults should be between 80 and 110 milliseconds.When the QRS wave group becomes wider, it may indicate a conductive abnormality.For example, an abnormal second rising offset may also occur in the QRS wave population when the beam branch is blocked, a case called the R' wave.
"The great significance of the shape and duration of the QRS wave group in diagnosing heart disease cannot be ignored."
Different types of QRS wave groups
Q waves usually represent depolarization of the ventricular septum, while pathological Q waves refer to the offsets that the electrical signal passes through the damaged heart muscle.Characteristics of pathological Q waves include their amplitude accounts for more than 25% of the subsequent R wave, or their bandwidth exceeds 40 milliseconds.Furthermore, accurate diagnosis usually requires the same pattern to be observed in two corresponding leads.
R wave progress
In the forech lead, the R wave is usually displayed from the V1 lead as an rS-type composite wave, and then enhanced as the lead moves to the left.qR-type composite waves are usually visible on V5 and V6.Under normal circumstances, the conversion area of the QRS wave group is in V3 or V4. When the R/S ratio becomes greater than 1, it changes from the main negative offset to the main positive offset.
R wave peak time
RWPT peak time (RWPT) refers to the time from the start of the QRS wave group to the peak of the RWPT.The R-wave peak time of the right ventricle was measured in lead V1 or V2, while the left ventricle was measured in lead V5 or V6.Extended if it exceeds the normal range of 35 milliseconds (right ventricle) or 45 milliseconds (left ventricle).
J Point and ST Section
The point where the QRS wave group intersects with the ST segment is called the J point.When the ST segment is in a horizontal state and forms an acute angle with the last part of the QRS wave group, the J point is easily identified.However, when the ST segment slope or the QRS wave group widens, the positioning of both may become blurred.There is currently no consensus on the definition of point J.
Conclusion: Understanding the importance of QRS wave groups
The changes in QRS clusters may be a warning that may be problematic in the heart.From the efficiency of the heart conductivity to changes in muscle mass, they all affect the duration and shape of the QRS wave population.Medical professionals use these parameters to identify heart lesions and other potential health problems.Therefore, we might as well think: As our awareness of heart health increases, how can we better use this technology to prevent the occurrence of heart disease?
