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[Electrocardiographic diagnosis of left ventricular hypertrophy accompanied by complete right bundle branch block]
H Fukushi1, N Kanemoto, O Tokushima
1Central Clinical Laboratory, Tokai University Hospital, Kanagawa.
Insights
New electrocardiographic criteria effectively diagnose left ventricular hypertrophy (LVH) in patients with complete right bundle branch block (CRBBB). This study refines diagnostic accuracy for CRBBB patients requiring LVH assessment.
Area of Science:
- Cardiology
- Electrocardiography
- Cardiac Imaging
Context:
- Left ventricular hypertrophy (LVH) diagnosis can be challenging in patients with complete right bundle branch block (CRBBB).
- Standard electrocardiogram (ECG) criteria may require modification for this specific patient population.
- Echocardiography is the gold standard for assessing left ventricular mass (LVmass).
Purpose:
- To evaluate novel electrocardiographic criteria for diagnosing LVH in patients presenting with CRBBB.
- To determine the correlation between specific ECG variables and echocardiographically derived LVmass in CRBBB patients.
- To refine diagnostic accuracy by identifying sensitive and specific ECG markers for LVH in this cohort.
Summary:
- This study assessed 88 patients with CRBBB, excluding those with myocardial infarction, pericardial effusion, or undetermined axis.
- LVH was defined as LVmass ≥ 215 g using the Penn method via M-mode echocardiography.
- Key ECG variables, including wave amplitudes, ratios, QRS axis, and ST-T segments, were analyzed against LVmass. Significant correlations were found between LV wall thickness and R I, LV diastolic dimension and RV5, and LV mass and R I+S III.
Impact:
- The findings contribute to improved non-invasive diagnosis of LVH in CRBBB patients.
- This research may lead to updated clinical guidelines for ECG interpretation in complex cardiac conditions.
- Enhanced diagnostic capabilities can facilitate timely and appropriate management of LVH, potentially improving patient outcomes.
Abstract:
The new electrocardiographic criteria for diagnosing left ventricular hypertrophy (LVH) were evaluated in patients with complete right bundle branch block (CRBBB) based on the relationships between left ventricular mass and multiple electrocardiographic variables obtained from 12-lead electrocardiograms. The subjects consisted of 88 patients with CRBBB, whose ages ranged from 18 to 86 years. Patients with histories of myocardial infarction, moderate to severe pericardial effusion and an undetermined axis were excluded from the study. LVH was defined as left ventricular mass (LVmass) > or = 215 g calculated from the Penn method using standard M-mode echo measurements. All electrocardiograms were interpreted by one investigator who had no knowledge of the echocardiographic results. Items calculated were the amplitude of Q, R, and S waves and their A/R, R/S, and S/A ratios, the mean frontal QRS axis, ventricular activation time in lead V5, the Morris' index, ST-T segment depression in leads V5,6, and negative U waves in leads V5,6. We selected 22 items for our criteria according to their sensitivity and specificity, and added to the 11 previously reported ones determined. LV wall thickness correlated best with R I (r = 0.57, p < 0.01), LV diastolic dimension with RV5 (r = 0.48, p < 0.01), and LV mass with R I+S III (r = 0.60, p < 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)