The

complex (wave) represents the sum of all ventricular muscle cell depolarizations

Primary hypertension, also known as essential hypertension, refers to high blood pressure that has no identifiable underlying cause. Risk factors for developing primary hypertension include a family history of hypertension, age, obesity, smoking, sedentary lifestyle, stress, and certain dietary factors.

Specifically, diabetes mellitus is a risk factor for hypertension due to the effects of insulin resistance and hyperinsulinemia on the blood vessels, as well as the increased prevalence of obesity and other comorbidities. Moderate alcohol consumption (up to 1 drink per day for women and up to 2 drinks per day for men) may actually have a protective effect against hypertension, but excessive alcohol intake can raise blood pressure and contribute to the development of hypertension.

Asian race is not a significant risk factor for primary hypertension, although there may be differences in the prevalence and severity of hypertension among different racial and ethnic groups.

Infective endocarditis is an infection of the endocardium (the inner lining of the heart), which can lead to damage of the heart valves. It is most commonly caused by bacteria, although fungi and other microorganisms can also cause the condition. The bacteria that most commonly cause infective endocarditis are Streptococcus and Staphylococcus species.