What are the possible causes of sudden spikes in blood pressure where: - no history of high blood pressure until about 2 weeks ago (female, age 62, lifetime nonsmoker, non-alcohol) - brain MRI, blood work and chest X-ray tests came back clear - patient is slightly obese - patient has a stent from a blockage several years ago with no labs at time indicating blockage potential - patient takes Crestor & 1 low dose aspirin daily - patient s BP is responding to 5mg Lisinopiril 1 x per day (from 172/119 at noon to 145/92 this pm) - can a heart blockage cause sudden, otherwise unexplained spikes in BP?