Strain echocardiography in predicting LV dysfunction in RV apical pacing

Right ventricular (RV) pacing is associated with a reduction in left ventricular (LV) systolic function, thought to be mediated by pacing-induced ventricular dyssynchrony. The prevalence of heart failure after RV pacing is reported to range from 31±3%. We studied 60 subjects with high-grade atrioventricular block and Complete Heart Block (CHB) scheduled to undergo right ventricular apical pacing. 2D echocardiography was done at baseline, 1 month and 12 months. Pacing-induced cardiomyopathy was defined as a reduction in LVEF to <45%. Strain was evaluated off-line from digitally stored images using all advanced software package (cardiac wall motion quantification (CMQ); Toshiba Medical Systems). Longitudinal strain for individual myocardial segments was measured from the apical four-chamber, two-chamber and long axis views (16 segment AHA/ASE model). None had LV dysfunction at baseline based on 2D and strain echo imaging. Subsequently 18 patients were detected to develop low GLS score (less than -14.5) at 1 month. On subsequent follow up at 1 year, all 18 patients developed LV dysfunction on 2D Echocardiography. Thus Strain imaging with GLS score helped in early detection of LV dysfunction in RV apical pacing subjects. Pacing-induced cardiomyopathy had significant association with high grade AV block with pacemaker dependency. It had no significant associations with other comorbidities like diabetes, hypertension, ischemic heart disease or with the type of medication intake. However there was a statistically significant association with heart failure

Complications of hypertension as encountered by primary care physician.

Hypertension is a common clinical problem with great implications for public health. It is a silent killer and often remains asymptomatic. So regular BP check-up is a must. Complications of untreated hypertension include ventricular hypertrophy, heart failure and accelerated atherosclerosis, cerebrovascular disease and stroke, renal failure and retinopathy. Primary care physicians have immense duty to perform in this regard because they are the first to encounter them in various stages of the disease. Hypertension can present per se or in emergencies (as in crisis) or in disguise of a complication (like anaemia and renal failure). Control of hypertension and delaying the development of complications should be their first goal. Lastly, some hypertensives with complications may require referral to advanced centres.