Engines that do not have a water cooling system can not use a heater core; one alternative is to guide air around the (very hot) engine exhaust manifold and then into the vehicle's interior. Temperature control is achieved by mixing with unheated outside air.
1. A widening of the prevertebral soft tissue is often associated with injury to the cervical spine. Injury to the cervical spine may be accompanied by pre and/or paravertebral haematoma, which is radiographically demonstrated as an abnormal increase within the width of the prevertebral space [1] , [2] and [3] .his study was undertaken to explore the diagnostic value of prevertebral soft tissue swelling with special reference to the association of this sign with the presence and degree of cervical spine injuries.
Premature rupture of membranes (PROM) is rupture of membranes before labor. Preterm PROM refers to the rupture of membrane before labor that occurs prior to 37 weeks of gestation. Preterm PROM complicates approximately 3% of all pregnancies in the United States .