A person has headache & profuse sweating. On examination his B.P is 200/120 mm Hg. Which of the following shoud not be used
Nifedipine
Sodium nitroprusside
Phenoxybenozamine
Methyldopa
Patients who respond to shoacting vasodilators at the time of cardiac catheterization (a fall in mean pulmonary aerial pressure >=10 mmHg and a final mean pressure <40 mmHg) should be treated with calcium channel blockers. Typically, these patients require high doses (e.g., nifedipine, 240 mg/d, or amlodipine, 20 mg/d). Patients may have dramatic reductions in pulmonary aery pressure and pulmonary vascular resistance associated with improved symptoms, regressionof RV hyperophy, and improved survival now documented to exceed 20 years. However, <20% of patients respond to calcium channel blockers in the long term. These drugs are not effective in patients who are not vasoreactive. ref:Harrison&;s principles of internal medicine,ed 18,pg no 2079
C.V.S