Injury due to lightening can be due to all except (LQ)
|A||Direct injury due to current|
|B||Buns due to super headed light|
|C||Expanded air after flash|
|D||Compressed air before the flash|
Compressed air before the flash
Explanation – Electrical Injuries:
a. JOULE BURN: contact electrical and endogenous burn.
b. CROCODILE FLASH BURN: high voltage burn. Multiple lesions due to ‘ARC EFFECT’. Metal particles and the skin at the site of entrance. Death due to ventricular fibrillation.
c. CURRENT PEARLS AND WAX DROPS seen on radiology.
d. LIGHTENING STROKE: It’s an electrical discharge from the cloud to the earth.
e. FILLIGREE BURN/ LITCHENBURG’ S FLOWERS: superficial, irregular , thin resembling the branches of a tree also known as arborescent burn. Most common site is shoulder flanks. Cause is staining of tissues with Hb due to rupture of smaller blood vessels along the path of current.Mechanism of injury by lightening
f. Due to direct effect of current of very high voltage, cardio-respiratory failure or sudden cardiac arrest is likely to ensue.
g. Burning by the flash of lightening.
h. The atmospheric gases become heated to 20,000 c, and this heating of gases in the path of lightening causes an explosive expansion. Blast effect of the rapidly expanding air which may tear the clothing and impart suspicion of foul play.
i. Compression effect due to air movement in its return wave produces the changes.
So compression effect is after the flash not before the flash.