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Left Ventricular Hypertrophy

Left Ventricular Hypertrophy. Detection, significance and treatment. Pathophysiology of LVH. High BP   LV wall stress Wall stress  1/ wall thickness LV wall thickening   wall stress Myocyte hypertrophy and  collagen matrix Mediators: Mechanical: preload & afterload

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Left Ventricular Hypertrophy

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  1. Left Ventricular Hypertrophy Detection, significance and treatment

  2. Pathophysiology of LVH • High BP   LV wall stress • Wall stress  1/ wall thickness • LV wall thickening   wall stress • Myocyte hypertrophy and  collagen matrix • Mediators: • Mechanical: preload & afterload • Neurohormonal: angiotensin II, sympathetic NS

  3. Methods of detecting LVH • Clinical examination • Chest radiography • Electrocardiography • Echocardiography • (CT, MRI)

  4. Definition of LVH • Healthy cohort of subjects • No high BP, diabetes, CV disease, obesity • LVH defined as LVMI > mean + 2SD • Framingham Study LVMI > 131g/m2 males; > 100g/m2 females • Cornell, New York LVMI > 134g/m2 males; > 110g/m2 females Levy et al. Am J Cardiol 1987;59:956-60. Devereux et al. JACC 1984;4:1222-30.

  5. Risk factors for LVH • Age • Gender • Race • Genetic factors • Blood pressure • Obesity • Physical activity

  6. Clinic versus mean 24 hour systolic BP and LVMI Mayet al et. J Cardiovasc Risk 1995;2:255-61.

  7. 12-lead ECG showing LVH and strain

  8. Sensitivity and specificity of ECG criteria for LVH Devereux et al 1983, Murphy et al 1985, Levy et al 1990, Lee et al 1992, Devereux et al 1993, Schillaci et al 1994, Crow et al 1995, Norman et al 1995, Chapman et al (in press)

  9. Determinants of specificity of ECG criteria for LVH • Age • Race • Sex • Smoking • Obesity

  10. Cardiothoracic ratio and CHD mortality:Whitehall study *Adjusted for age, BP, HR, cholesterol, smoking, angina and ECG ischaemia Hemingway et al. BMJ 1998; 316: 1353-4.

  11. Cardiovascular risk in subjects with ECG-LVH: Framingham Age-adjusted risk-ratio *P<0.0001 Kannel. Eur Heart J 1992; 13 (suppl D): 82-88

  12. Risks of X-ray and ECG LVH:Framingham Age-adjusted biennial rate per 1000 Data include men and women, aged 35-94 Kannel. Eur Heart J 1992; 13 (suppl D): 82-88

  13. Echocardiography • Advantages • sensitivity • improved correlation with morbidity & mortality • assessment of function (systolic and diastolic) • addition to individual’s risk profile • Disadvantages • skilled operator • time • cost

  14. Echocardiographic LVH and prognosis Sheps and Frohlich. Hypertension 1997; 29: 560-563.

  15. M-mode echocardiograms LVH Normal

  16. Penn convention for M-mode measurements • Peak of QRS • Endocardium excluded from SWT and PWT • Endocardium included in LVID LV mass = 1.04[(SWT+LVID+PWT)3 - (LVID)3 - 14g Divide by body surface area to get LV mass index Septum (SWT) LV cavity (LVID) Posterior wall (PWT) Devereux & Reichek Circulation 1977;55:613-8

  17. ASE guidelines for M-mode measurements • Start of QRS • Endocardium included in SWT and PWT • Endocardium excluded from LVID LVM = 0.8{1.04[ (SWT+LVID+PWT)3 - (LVID)3]} + 0.6 g Divide by body surface area to get LV mass index Septum (SWT) LV cavity (LVID) Posterior wall (PWT) Devereux et al. Am J Cardiol 1986;57:450-8

  18. Area-length method for calculation of LV mass LVmass=1.05[5/6(A1xL1)-5/6(A2xL2)] Divide by body surface area to get LV mass index Reichek et al. Circulation 1983;67:348-52

  19. 4-year age-adjusted incidence of cardiovascular disease according to LVMI Age-adjusted incidence/ 100 subjects LVMI (g/m2) Redrawn from Levy et al; NEJM 1990; 322: 1561-6.

  20. 4-year age-adjusted cardiovascular mortality Incidence of cardiovascular mortality according to presence or absence of LVH P=ns P<0.001 Redrawn from Levy et al, NEJM 1990; 322: 1561-6.

  21. Echocardiographic LVH and prognosis Sheps and Frohlich. Hypertension 1997; 29: 560-563.

  22. Risks associated with LVM and geometry Cardiovascular events† Total mortality* % patients RWT LVMI (g/m2) LVMI (g/m2) *P<0.001, †P=0.03 Koren et al. Ann Int Med 1991; 114: 345-352.

  23. Regression of LVH by drug treatment:meta-analysis of RCTs Mean %  in LVMI Between treatment P<0.01 Schmieder et al. JAMA 1996; 275: 1507-1513

  24. LVH regression: LIVE study % from baseline * *P<0.05 for LVMI Sheridan and Gosse 1998

  25. Prognostic significance of Echo LVM regression † Events/ 100 patient years * *P=0.04, †P=0.0004 after adjustment for age. Verdecchia et al. Circulation 1998; 97: 48-54

  26. Prognostic significance of ECG voltage changes: Framingham * OR for CV events (2 years) * *P<0.05 Levy et al. Circulation 1994; 90: 1786-1793

  27. Who to refer for echocardiography? • Patients with borderline BP: • LVH may influence decision to treat • Patient with multiple risk factors: • LVH may lead to other interventions e.g. lipid lowering therapy • Possible white coat hypertension • ? To stratify class of antihypertensive agent to be used (increasing data suggesting LVH regression should be a goal of treatment)

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