Assessment of left ventricular hypertrophy in patients with essential hypertension. A rational basis for the electrocardiogram.
ABSTRACT There is a large body of evidence that the electrocardiogram (ECG) is insensitive in the recognition of left ventricular hypertrophy (LVH), in comparison with the echocardiogram; however, its specificity is high. In this study we further analyzed the performance of the ECG in detecting LVH in 200 consecutive patients (124 men and 76 women, mean age 50.9 years) with mild to moderate essential hypertension, using echocardiographically determined left ventricular mass (LVM) as the standard for comparison. To test the hypothesis that, owing to the high number of true positive findings, the ECG may still be useful for clinical purposes by selecting subsets of hypertensives with higher degrees of LVH, we compared the mean values of LVM index corresponding to either positive (true positive) or negative (false negative) electrocardiographic signs of LVH. In this study 69 patients (34.5%) had echocardiographic LVH, as defined by a LVM index exceeding 125 g/m2 for men and 112 g/m2 for women. Almost all criteria demonstrated high levels of specificity (> or = 89%). In the whole group the Lewis index ((RI - RIII)+(SIII - SI) > or = 17 mm) showed a slight superiority in diagnosing LVH (sensitivity = 43%) in comparison to the remaining criteria; the confidence intervals estimate of sensitivities confirmed such diagnostic superiority only with respect to those criteria with a sensitivity < or = 17%. However, the use of McNemar's test to compare sensitivities of all electrocardiographic criteria at matched specificities (> or = 95%) did not show significant differences (P < .05).(ABSTRACT TRUNCATED AT 250 WORDS)
- SourceAvailable from: Adewole A Adebiyi[Show abstract] [Hide abstract]
ABSTRACT: Electrocardiographic left ventricular hypertrophy with strain pattern has been documented as a marker for left ventricular hypertrophy. Its presence on the ECG of hypertensive patients is associated with a poor prognosis. This review was undertaken to report the prevalence, mechanism and prognostic implications of this ECG abnormality. We conducted a comprehensive search of electronic databases to identify studies relating to the title of this review. The search criteria were related to the title. Two of the reviewers independently screened the searches. Results were described qualitatively. The data were not pooled because there were no randomised studies on the topic. The prevalence of ECG strain pattern ranged from 2.1 to 36%. The highest prevalence was reported before the era of good antihypertensive therapy. The sensitivity as a measure of left ventricular hypertrophy ranged from 3.8 to 50%, while the specificity was in the range of 89.8 to 100%. Strain pattern was associated with adverse cardiovascular risk factors as well as increased all-cause and CV morbidity and mortality. ST-segment depression and T-wave inversion on the ECG was recognised as the strongest marker of morbidity and mortality when ECG-LVH criteria were utilised for risk stratification in hypertensive subjects. Electrocardiographic strain pattern identifies cardiac patients at higher risk of cardiovascular-related as well as all-cause morbidity and mortality.Cardiovascular journal of Africa 19(1):39-45. · 0.79 Impact Factor
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ABSTRACT: Introduction: It has been suggested that hypertension (HTN) is associated with certain target organ damage (TOD) and related clinical conditions. On the other hand, left ventricular hypertrophy (LVH) has been considered as an independent risk factor of cardiovascular events and death. The aim of this study was to examine the relationship between HTN-induced LVH and TOD (retinopathy and renal failure). Methods: We assessed 102 hypertensive subjects (43 males and 59 females) with a mean age of 60.2 +/− 8.8 (range 35-81) years. LVH was defined as a left ventricular mass index (LVMI) of more than 51 and 47 g/(m (to the power of 2.7)), in men and women, respectively. The degree of retinopathy on ophthalmological examination was defined according to the Keith-Wagener classification. Serum creatinine, blood urea nitrogen and urine protein concentrations were also measured. Results: Hypertensive retinopathy was found in 94 (92.2 percent) cases (Grades I 55.9 percent; II 28.5 percent; III 3.9 percent; IV: 3.9 percent). The mean systolic and diastolic blood pressures and serum creatinine concentration showed significant correlation with the severity of LVH. There was no significant relationship between LVH severity and retinopathy or proteinuria. Conclusion: The tight control of systolic and diastolic blood pressures in the first step of essential hypertension can assist to postpone LVH. Furthermore, routine measurement of serum creatinine can predict the risk of cardiovascular complications in the hypertensive patient.