Did I get this thing right ?

Question

Narrow blood vessels are called vasoconstriction and this causes deficient blood flow which is called ischaemia and this deficient blood flow cause pain in the chest called angina pectoris. And widen of blood vessels is called vasodilatation and can be controlled by vasodilator. Having an abnormal heart beat is called fibrllation and can controlled by fibrllators.
Right???????????

Answer 1

Sort of.

Vasoconstriction means that the smooth muscle of the blood vessel constricts, which narrows the lumen and does not allow as much blood supply to its terminal tissue. While angina pectoris is caused by ischemia, it does NOT have to be caused by vasoconstriction, because heart failure, emboli, valvular stenosis, atherosclerosis, etc, may all cause angina pectoris, but none of those are due to vasoconstriction.

Vasodilation refers to relaxation of vessel smooth muscles, which allows greater blood supply to tissues. You are correct in that it may be controlled with vasodilating medications, but I would also add that vasoconstrictors may also control vasodilation in an inhibitory manner.

An abnormal heart beat is NOT fibrillation. Abnormal heart beat is called arrythmia, and is most commonly too slow (bradycardia) or too fast (tachycardia). Fibrillation refers to VERY rapid (i.e. excessively tachycardic) heart beat that results in ineffective and disorganized heart contraction. It may be controlled by defibrillation, as you said, and may also be controlled by certain drugs as well.

Answer 2

Your on the right track. Just to make sure I understand what you mean, I'll clarify this part. Vasodilators are used to control (fix, prevent) vasoconstriction. For example, when someone has angina (lack of blood flow and oxygen to the heart causes pain), they take nitroglycerin (a vasodilator) so more blood flows to the cardiac tissue and relieves the pain. Technically, an abnormal heart beat is called an arrhythmia. A type of arrhythmia is a fibrillation (atrial fibrillation or ventricular fibrillation). Some serious arrhythmias, like ventricular fibrillation, can be corrected with a defibrillator. (Clear! Zzap!) Hope this helps!

Answer 3

everything sounds ok up until the fibrillation part. there are two different types of "irregular" heart beats. atrial fibrillation or ventricular fibrillation. atrial fibrillation isn't necessarily life-threatening. some people can live ok with a fib as long as they take certain medications to control their heart rate. however, ventricular fibrillation is life-threatening and patients will die unless the rhythm is converted back to normal sinus rhythm. that is done using a defibrillator, a device which delivers an electric shock across the patient's chest.