In tetanus patients Levodopa and Carbidopa combination (which is usually used to relieve the signs of extrapyramidal) causes respiratory muscles spasm relief thereby the need for sedatives is decreased and patient saved later on via central nervous system mechanism, by providing the inhibitory neurotransmitters at Anterior Horn cells.

In rabies patient on blowing on any ear, the respiratory muscle spasms is increased. This “KD EAR BLOW SIGN IN RABIES” is due to increase in humidity (examiners moist air blow) in the auditory canal which in turn sends impulses via those auditory nerves to temporal lobe thus stimulating reflex

In tetanus patients Levodopa and Carbidopa combination (which is usually used to relieve the signs of extrapyramidal) causes respiratory muscles spasm relief thereby the need for sedatives is decreased and patient saved later on via central nervous system mechanism, by providing the inhibitory neurotransmitters at Anterior Horn cells.