Question 1 1 / 1 pts Diagnosis of heart failure cannot be made by symptoms alone because many disorders share the same symptoms. The most specific and sensitive diagnostic test for heart failure is: Complete blood count, blood urea nitrogen, and serum electrolytes that facilitate staging for endorgan damage. Chest x-rays that show cephalization and measure heart size. Correct! Two-dimensional echocardiograms that identify structural anomalies and cardiac dysfunction. Measurement of brain natriuretic peptide to distinguish between systolic and diastolic dysfunction. Question 2 1 / 1 pts Because primary hypertension has no identifiable cause, treatment is based on interfering with the physiological mechanisms that regulate blood pressure. Thiazide diuretics treat hypertension because they do which of the following? Correct! Deplete body sodium and reduce fluid volume.