Hyperglycemia is not a known cause of syncope. Severe hypoglycemia can cause loss of consciousness but there is no known blood glucose level below which syncope would be expected because there is no data regarding that measurement in the context of syncope.
If you have diabetes mellitus, particularly chronic, then there is a reason for syncopal occurrences. Diabetes causes autonomic dysfunction leading to impaired vasomotor responsiveness to challenges in venous return to the heart, most commonly as a result of standing from a supine or seated position or prolonged standing.
I've attached some monographs on syncope that you may find helpful.
Your blood pressure in the ER was normal to high, so I suspect you are not taking antihypertensive medication. This would raise the suspicion that you experienced an episode of "situational" syncope, precipitated by visceral pain. Abdominal pain is a common trigger for this.
I also noticed that the ER report did not include a complaint of syncope or near-syncope. That may have been missed, but the high blood sugar wasn't the cause of lightheadedness or fainting.
Hypoglycemic coma is commonly used term in Clinical practice while Hyperglycemic coma is not so. But You can use term hyperglycemic coma if patient having altered Conscious level
It is a real and severe medical condition. It's an extreme outcome of uncontrolled high blood sugar (hyperglycemia). Hyperglycemic coma primarily results from two main conditions: diabetic ketoacidosis (DKA) and hyperosmolar hyperglycemic state (HHS).
Diabetic Ketoacidosis (DKA):Most common in people with type 1 diabetes, but it can also occur in type 2 diabetes under certain conditions. It arises from a shortage of insulin, leading to increased breakdown of fat, producing ketones. An accumulation of ketones in the blood causes the blood to become acidic. Symptoms leading to DKA include excessive thirst and urination, fatigue, difficulty breathing, nausea, vomiting, abdominal pain, and a characteristic fruity odor on the breath. Without prompt treatment, DKA can lead to coma and even death.
Hyperosmolar Hyperglycemic State (HHS):More common in type 2 diabetes. It results from extremely high blood sugar levels without significant ketone production. The body tries to get rid of the excess sugar through urination, leading to severe dehydration. Symptoms include excessive thirst and urination, fever, vision changes, dry skin, and confusion. Like DKA, if not treated promptly, HHS can lead to coma, organ damage, and death.
For both conditions, potential triggers include infections, certain medications, undiagnosed or poorly managed diabetes, and other illnesses that cause stress on the body.