During tonic-clonic seizures, the tonic phase is characterized by:

Appeared in: NHM UP Staff Nurse - 2019

Explanation

The tonic phase is the initial stage of a tonic-clonic seizure, defined by a sudden, generalized contraction of muscles throughout the body.
This sustained muscle contraction results in the characteristic 'stiffening' of the body, where the limbs and trunk become rigid.
According to medical literature, this phase is typically brief, lasting about 10 to 20 seconds before transitioning to the clonic phase.
An 'ictal cry' or loud moan may occur at the onset due to the forceful contraction of expiratory muscles.

Option B: This describes the clonic phase of the seizure, not the tonic phase.
Option C: While loss of consciousness occurs at the onset of a tonic-clonic seizure, it is not the specific motor feature that defines the tonic phase.
Option D: Confusion is the hallmark of the postictal phase, which is the recovery period after the seizure has concluded.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Phases of a tonic-clonic seizure as background academic context rather than a clinical decision trigger.
Accurately identifying and documenting seizure phases helps nurses provide a precise report to the medical team, which is vital for diagnosis, classification of the epilepsy syndrome, and treatment adjustments.
The primary nursing priority during any seizure is patient safety. During the tonic phase, the patient is at high risk for falls and injury due to the sudden, forceful muscle contractions and loss of consciousness.
What if? If a patient's seizure consists only of body stiffening without a subsequent jerking phase, it would be classified as a 'tonic seizure,' not tonic-clonic. This distinction is important for diagnosis and selecting the appropriate anti-seizure medication.

How to Approach the Question

First, identify the core subject of the question: the 'tonic phase' of a 'tonic-clonic seizure'.
Recall the definitions of 'tonic' and 'clonic'. 'Tonic' relates to muscle tone and stiffness, while 'clonic' relates to rhythmic jerking or clonus.
Evaluate each option based on this understanding. 'Stiffening of the body' directly corresponds to the definition of the tonic phase.
Differentiate the other options by placing them in the correct phase of the seizure: 'jerking' belongs to the clonic phase, and 'confusion' belongs to the postictal phase.
Conclude that stiffening is the unique characteristic of the tonic phase among the choices provided.

Concept Tested & Keywords

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E6 Medicine Harrison 22e Part 2 p. 1314-1316

E6 Kaplan Sadock's Synopsis of Psychiatry-2022 (pp 1-3768 of 3768) p. 807-809

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