-A WSN is a specialized wireless network made up of large number of sensors and at least one base station. The foremost or the main difference between WSN and the traditional wireless networks is that sensors are extremely sensitive to energy consumption. Energy saving in the crucial issue in designing the wireless sensor networks [12]... Since the radio transmission and reception consumes more energy, one of the most or the main significant issue in wireless sensor network is the inherent limited battery power within network sensor nodes. It is preferable to dispense the energy throughout the wireless sensor network so to maximize the lifetime of sensor nodes. So it is essential to design effective and energy aware protocols in order to enhance the life time of the network. A wireless sensor network may have network structure based or protocol operation based routing protocol. In this paper, a review on hierarchical based routing protocol which is further a sub-type of the network structure based routing protocol in WSNs is carried out. Major issues which are considered in WSNs are Energy consumption and network life time.

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Blunt trauma abdomen is a very common entity but traumatic abdominal wall hernia is not that common. Herniation through abdominal wall usually occurs following trauma with seat belt, motor cycle, bicycle handle bar etc. Handlebar hernia is a less known variety of traumatic abdominal wall hernia as a consequence of injury with handlebar of a bicycle. It is difficult to diagnose and one should have high index of suspicion. Management in traumatic abdominal wall hernia is individualized based on various factors. We herein present an interesting case of a14-year-old boy, who sustained blunt trauma abdomen from bicycle handlebar leading to triple herniation and perforation of the small bowel and hematoma of the mesentery. Patient was resuscitated and operated with a favorable outcome. Blunt trauma abdomen is a very common and the possibility of traumatic abdominal wall hernia should always be borne in mind.

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