Main ECG signs of right ventricular hypertrophy
Analysis of the right heart chambers on the cardiogram is based on evaluating the electrical axis and the morphology of the ventricular complexes. Pathological changes reflect the systemic reaction of the body and overload of the heart chambers.
Key criteria for right ventricular (RV) damage:
- Electrical axis of the heart (EAOH): a pronounced rightward deviation of the axis is observed (forming right axis deviation). In some cases, a vertical position of the EAOH is registered.
- Changes in precordial leads (V1 and V2): these leads are the most informative for assessing the right heart chambers. The main sign is the dominance of the R wave — its amplitude increases pathologically. Concurrently, a marked decrease in the S wave amplitude occurs.
- Repolarization processes: myocardial overload leads to T wave inversion (it becomes negative in leads V1–V2) and also causes specific ST-segment changes.
Assessment of the atrial component
Hemodynamic disturbances in the right ventricle inevitably affect the state of the atria. When sinus rhythm is preserved, the ECG reveals signs of their overload and hypertrophy.
- P pulmonale: indicates right atrial overload. Tall, peaked P waves are recorded on the cardiogram, best seen in standard leads (II, III).
- P mitrale: since right ventricular pathology is often concomitant with mitral valve disease, the ECG may reveal signs of left atrial overload. This manifests as a broad, notched P wave in leads I and II.
With prolonged duration and severe atrial overload, atrial fibrillation frequently develops — a rhythm disturbance in which the P wave completely disappears on the cardiogram.
Comprehensive instrumental diagnostics
To confirm the diagnosis, verify structural changes, and accurately assess hemodynamics, electrocardiography is supplemented with other methods.
X-ray examination (especially in oblique projections) allows visualization of right ventricular hypertrophy and dilation. Radiograms reveal a "mitral configuration" of the heart: the cardiac waist is smoothed out due to the bulging of the left atrial appendage (second arc) and the pulmonary trunk (third arc). Signs of pulmonary hypertension are also visible: enhanced vascularization of the upper lobes, dilation of the main pulmonary trunk and its branches, and signs of fluid transudation into the interstitium. The dimensions of the left ventricle usually remain normal, but calcification of the mitral valve and enlargement of the left atrial shadow may be detected.
Echocardiography (EchoCG) is used as a confirmatory method:
- M-mode (one-dimensional): reveals a specific sign — concordant motion of the mitral valve leaflets in diastole (both move forward parallel to each other), while the motion curve resembles the letter "П".
- Two-dimensional EchoCG: allows accurate measurement of the mitral orifice area, visualization of left atrial and right ventricular enlargement (with hypertrophy), and detection of intracavitary (usually mural) thrombi.
- Doppler mode: provides direct visualization of blood regurgitation through the tricuspid valve.
As an additional method for assessing severity, phlebography (venous pulse) is used. It shows an increase in the "c" wave, and in severe regurgitation, the appearance of a pathological merged "cv" wave. The prognosis of the disease ultimately depends on the underlying pathology that caused the defect and the severity of its course. The patient's appearance may also reflect a systemic reaction: Facies mitralis is characteristic — a youthful appearance combined with a cyanotic flush of the cheeks.
To memorize P wave changes: P pulmonale ("pulmonary", right atrium) — tall and sharp, like a mountain peak (leads II, III). P mitrale ("mitral", left atrium) — broad and notched, like the letter "M" (leads I, II).
What else to study on this topic
- Radiological signs of pulmonary hypertension and the formation of the "mitral configuration" of the heart.
- Echocardiographic picture in M-mode: П-shaped motion of the leaflets.
- Assessment of tricuspid regurgitation using Doppler EchoCG.
- Phlebography (venous pulse) changes in severe heart failure.
- Clinical significance of the Facies mitralis symptom in hemodynamic disorders.
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