Intermittent or recurrent sudden increases in heart rate, with a drop in blood pressure, suggest possible supraventricular tachycardia, atrial fibrillation, or some other cardiac dysrhythmia. The sudden increase can be caused by medications(stimulants), stress, or an underlying abnormality of the heart. A elderly patient experiencing this with a drop in blood pressure most likely has some type of underlying cardiac disease, such as coronary artery disease (hardening of the arteries of the heart)that has not been detected or diagnosed yet. The patient should be seen by their physician or a cardiologist. The testing that may be performed include an laboratory studies, EKG, holter monitor, echocardiogram, stress testing, and possibly cardiac catheterization. I have no doubt your father is being treated for his heart problems. It is extremely important he works closely with the family doctor and also the Cardiologist. If you have a good Cardiologist then phone him/her and let them know what is going on. 71 isn't all that old.
the minute you are born.
Pressure . . . ?
Oil pressure shouldn't register at all until the engine starts and builds up pressure.
Air pressure starts to go away
The blood pressure rises up
A rock is always formed by heat and pressure it always starts out with heat and pressure......
The liquid starts boiling