Which features define a tonic-clonic (grand mal) seizure?

Which features define a tonic-clonic (grand mal) seizure?

• A. Loss of consciousness, rigidity in muscle tone, and clonic jerking
• B. Aura with sensory distortions only
• C. Brief staring spells
• D. Postictal confusion lasting hours

Answer: (A)

Generalized tonic-clonic seizures are defined by sudden loss of consciousness with bilateral involvement of the body. The hallmark motor pattern includes a tonic phase of sustained muscle rigidity (stiffness) followed by a clonic phase of rhythmic jerking. This combination—unconsciousness plus the sequence of stiffening then jerking—is what distinguishes a tonic-clonic (grand mal) seizure. An aura with sensory distortions points to focal onset seizures, not generalized ones. Brief staring spells describe absence seizures, and postictal confusion can occur after a generalized seizure but isn’t what defines the seizure type.

Generalized tonic-clonic seizures are defined by sudden loss of consciousness with bilateral involvement of the body. The hallmark motor pattern includes a tonic phase of sustained muscle rigidity (stiffness) followed by a clonic phase of rhythmic jerking. This combination—unconsciousness plus the sequence of stiffening then jerking—is what distinguishes a tonic-clonic (grand mal) seizure. An aura with sensory distortions points to focal onset seizures, not generalized ones. Brief staring spells describe absence seizures, and postictal confusion can occur after a generalized seizure but isn’t what defines the seizure type.