Question

how does glucose help the patient to recover

Answer 1

Every now and then people faint. Typically someone around diagnoses it as a "low-blood-sugar crisis/attack". It takes sometime to find some source of sugar to be given to the patient. Then usualy she/he recovers. If A = B and B = C then A = C. That proves that indeed the patient did have a low sugar crisis! Wrong! Probable the facts that it takes some time and that the patient rests in a horizontal position are the key factors for them to recover. During my trainning as an endocrinologist in UK we received lots of referals of people suffering from supposed hypoglicemic crisis. Sometimes there was even a known condition that triggered their crisis: climbing a few treads of a stair, a glass of whiskey, etc. Many times I put a needle in their veins, took a sample for basal glucose level, exposed the patient to the known triggering condition, the patient sometimes fainted and then meassured again their glucose level and... it were reported both normal. Hypoglicemia seldom occurs in normal people. It is not unusual in diabetics receiving insulin shots (overdoses). Most often it is misdiagnosed as happens with hypothyrodism (but that is another story).

Answer 2

Purpose of giving glucose is :
1.In a state dehydration your cells are completely exhausted now glucose act as food source for them.
2.Due to loss of water there is the blood becomes very concentrated to avoid this our cells begin to lose water so that blood remain in the normal state.

So when you infuse lot of glucose and ors(salts) amd water you subsitute amount of glucose and salts lost from the body and you also avoid cell shrinkage and death by mantaining a normal normal concentration of solutes in the blood.