## 8 Conclusions  
In this survey we have reviewed the state of the art of WBSN providing a wide overview of features, practices and the most important issues that researchers will face for emergency scenarios. Unlike other surveys we have presented information that helps to contemplate development of an adaptive system optimization according to the needs and behavior of the network at any given moment. The development of the proposed system would allow extending its application to diverse scenarios as patients with chronic-degenerative illnesses, preventive monitoring or patients in intensive care. Additionally, we consider the video transmission as an important feature into a WSBN in an emergency scenario. The visual interaction between the paramedic and the doctor in this context is very helpful to enhance the medical treatment of the victim. We introduce some aspects like the video and vital sign joint-transmission in real time, and the synchronization between them, supporting the physicians to have a better picture of patient's condition in order to have a better diagnosis. However, our research helps us to understand the existence of some issues ignored, for example, in the MEDISN [17], the coexistence between different technologies and noise signals that can be found inside a building is not evaluated, especially if network is deployed with multiple sensors of different transfer rates struggling to send information. Similarly, it shall be verified the performance under network scalability conditions.  
Nevertheless, situations as mobility of sensors, wireless technology coexistence and noise are not addressed. So in addition with the above issues the following question arises: is it possible that by using different technologies applied in WBSN, communication protocols and capabilities of network devices, a reduction of energy consumption can be achieved? Surely it can be attained, but it will be necessary to develop new schemes and methodologies that allow analyzing and optimizing the exchange of information between the devices. Strategies like these will help to determine the characteristics that a model or system must have within the framework of energy efficiency. Once the last question is resolved, patients could increase their survival possibilities because they will have specialized medical care starting at the scene of the accident or emergency event.  
This work has been funded by the Research Chair on Mobility and Wireless Networks at Tecnologico de Monterrey, Campus Monterrey, Mexico. This research was elaborated while [PERSON] and [PERSON] \(\bar{\text{n}}\)n were visiting the Technical University of Catalonia in Castelldefels, Barcelona, Spain.  
The authors of this work have contributed in a valuable manner in order to give the reader a comprehensive view of WBSN. [PERSON] was responsible for the paper's organization and provided relevant topics as: physiological signal monitoring and WBSNs Overall System, energy consumption, system optimization and power efficient protocols overview. [PERSON] \(\bar{\text{n}}\)n focused on the video technology in m-Health Systems. Finally, [PERSON], [PERSON] and [PERSON] supervised the work and provided valuable feedback for the development of the present work.  
The authors declare no conflict of interest.