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An electrocardiographic--pathologic correlative study on left axis deviation in hypertensive hearts
Insights
Hypertension can cause left atrial enlargement (LAH) indicated by left axis deviation (LAD) over -30 degrees. Pathological findings in autopsy specimens reveal cardiac lesions linked to hypertension and chronic renal failure.
Area of Science:
- Cardiology
- Pathology
- Medical Imaging
Background:
- Hypertension is a significant risk factor for cardiovascular disease.
- Electrocardiography (ECG) and histopathology are crucial for diagnosing cardiac abnormalities.
- Understanding the link between ECG findings and cardiac pathology is vital for patient management.
Observation:
- A study analyzed 35 autopsy specimens from hypertensive patients using electrocardiographic-pathologic correlation.
- Severe lesions were found at the left bundle branch area (LBBa) or His bundle in 91.7% of Group 1 cases.
- Histopathology revealed fibrosis, degeneration, bleeding, and calcification in cardiac tissues.
Findings:
- Left axis deviation (LAD) exceeding -30 degrees is proposed as a criterion for left atrial hypertrophy (LAH) in hypertensive patients.
- Severe lesions in both left bundle branch (LBB) radiations were observed in six cases.
- Findings suggest LAD may result from slowed conduction at the LBBa or compensatory mechanisms between LBBa and LBBp.
Implications:
- The study highlights the utility of LAD as an ECG indicator for hypertensive heart disease.
- Pathological changes observed are attributed to mechanical strain and metabolic alterations from hypertension and renal failure.
- These findings can improve the non-invasive diagnosis and understanding of cardiac complications in hypertensive individuals.
Abstract:
We performed an electrocardiographic-pathologic correlative study using the step sectioning method in 35 autopsy specimens from patients with hypertension. Eleven out of 12 cases (91.7%) in Group 1 had severe lesions at LBBa or the His bundle and we propose that LAD in excess of -30 degrees is a good criterion in hypertension for LAH. There were six cases in all with severe lesions at both radiations of the LBB. In one case of Group 1, LAD is suggested to be due to slower conduction at the LBBa than at the LBBp and findings in five cases of Groups 2 and 3 led us to speculate that there was no LAD because of cancellation between the LBBa and the LBBp. Histopathology revealed fibrosis, degeneration, bleeding, and calcification which pathogenetically may derive from mechanical strain effected by hypertension, and metabolic changes in cases with chronic renal failure.