Why do you have to hyperventilate during an EEG?

Hyperventilation (HV) is an activation technique used during EEG recording to elicit epileptiform abnormalities, and in some cases seizures, in order to enhance the diagnostic sensitivity of EEG.

What is hyperventilation and photic stimulation?

In patients with known or suspected epileptic seizures, non-specific activation methods such as hyperventilation or intermittent photic stimulation (IPS) are used to provoke epileptic potentials, which may prove the epileptic nature and specify epileptic syndromes.

How does hyperventilation affect EEG?

Hyperventilation (HV) constitutes a classic activation procedure of the electroencephalogram (EEG) that usually provokes physiological slowing of the brain rhythms, more intense and abrupt in children from 8 to 12 years old (1-4).

What is photic stimulation in EEG?

Abstract. Intermittent photic stimulation (IPS) is a common procedure performed in the electroencephalography (EEG) laboratory in children and adults to detect abnormal epileptogenic sensitivity to flickering light (i.e., photosensitivity).

When to use hyperventilation in an EEG recording?

ANS/BSCN Guidelines for Hyperventilation During EEG Recordings ANS/BSCN Guidelines for Hyperventilation During EEG Recordings Hyperventilation (HV) is an activation technique used during EEG recording to elicit epileptiform abnormalities, and in some cases seizures, in order to enhance the diagnostic sensitivity of EEG.

How are activation procedures used in an EEG?

Activation Procedures Activation procedures are per- formed during an EEG to induce, enhance, or better define abnor- mal EEG patterns. The most commonly used activation proce- dures are hyperventilation, phot- ic stimulation, and sleep. Activation procedures should be used whenever possible and not medically contraindicated.

How is hyperventilation used in Ans / BScN guidelines?

ANS/BSCN Guidelines for Hyperventilation During EEG Recordings Hyperventilation (HV) is an activation technique used during EEG recording to elicit epileptiform abnormalities, and in some cases seizures, in order to enhance the diagnostic sensitivity of EEG.

When to use repeat HV in EEG monitoring?

Guideline Repeat or even prolonged HV is undertaken if clinically indicated (e.g. to induce seizures in a patient strongly suspected of having absences but whose initial HV is unremarkable, or a patient undergoing video-EEG monitoring for medically intractable epilepsy but not having any clinical seizures).