Which type of seizure causes loss of consciousness and violent muscle contractions due to abnormal electrical activity in the brain?

• A. Grand Mal Seizure
• B. Petit Mal Seizure
• C. Absence seizure
• D. Partial seizure

Answer: (A)

A generalized tonic-clonic seizure is characterized by a loss of consciousness accompanied by full-body muscle stiffness (tonic phase) followed by rhythmic jerking (clonic phase) due to abnormal electrical activity that rapidly spreads across both sides of the brain. This spreading disruption explains why consciousness is lost and why there are violent, widespread movements. After the convulsions, a person often experiences confusion or drowsiness as the brain recovers.

Petit Mal seizures, by contrast, involve brief lapses in awareness without dramatic convulsions, usually showing up as a momentary stare or subtle movements. Absence seizures are similar in being generalized but are marked by short, nonconvulsive lapses of consciousness, not violent convulsions. Partial (focal) seizures start in one area of the brain and may produce localized movements or sensations, and may or may not affect consciousness.

So the description fits the generalized tonic-clonic type, known for the dramatic loss of consciousness and violent, widespread contractions.