Lucid Interval

Extradural hemorrhage REF: Bailey and love 25^th edition page 303, Schwartz’s Principles of Surgery 9^th edition chapter 42. Neurosurgery,

“The classical presentation of an EDH, occurring in less than one-third of cases, is initial injury followed by a lucid interval when the patient complains of a headache but is fully alert and orientated with no focal deficit. After minutes or hours a rapid deterioration occurs, with contralateral hemiparesis, reduced conscious level and ipsilateral pupillary dilatation as a result of brain compression and herniation”

A i.e. Insanity

B i.e. Insanity

Ans. is ‘a’ i.e. Extradural Haemorrhage, ‘b’ i.e. Intra dural haemorrhage

Lucid interval is a temporal sequence of events in which the patient has a period of normal functioning following head injury until symptoms (stupor, coma) begin.

Lucid interval is characteristic of epidural hematoma, but is also seen in subdural hematoma.

Ans. is ‘d’ i.e., Extradural haematoma 

Ans. D: GCS score of O

Ans. C: Extradural hematoma

A lucid interval is especially indicative of an epidural hematoma.

Ans. Extradural hematoma

Ans. is `e’ i.e., Insanity

Lucid interval is seen in insanity and epidural haemorrhage.

Lucid interval is a state of consciousness between two episodes of unconsciousness in subacute/chronic epidural haemorrhage. It is significant that during this period (lucid interval), the person can :

(i) Make a valid will, (ii) Can give valid evidence, and (iii) Is legally responsible for act done (civil/criminal).

Lucid interval is also seen in insanity, i.e. the period of sanity between two phases of insanity.