## 3 Global Market and Bibliometric Analysis in the Healthcare Sector  
The global IoMT healthcare market has experienced significant growth, primarily driven by the increased adoption of technologies in the healthcare sector and rapid technological advancements. This connectivity enables medical devices to be connected to the internet, facilitating enhanced healthcare services. Government initiatives and private investments in digital technology have also contributed to the growth of the healthcare sector. As a result, the global IoMT market is expected to benefit from these factors. It is projected that the IoMT market will generate over US$ 172.4 billion by 2030, with a compound annual growth rate (CAGR) of 15.9% from 2021 to 2030 [37], as illustrated in Figure 3. Furthermore, key market players are anticipated to adopt new growth strategies, creating new opportunities for expansion. The ongoing pandemic has prompted rapid changes in the healthcare industry, and there is a likelihood of significant transformations in the entire healthcare sector in the future, with a focus on addressing pandemic situations.  
Figure 3: Internet of Things market size, 2020 to 2030 (USD Billion) [37].  
Figure 2: Smart and Connected Healthcare System Concept.  
The bibliometric analysis focused on IoMT healthcare in smart cities and utilized data from the Scopus database. The analysis primarily focused on articles as the primary type of publication in this domain. VOS viewer software was employed to conduct visualization analysis, which aided in identifying research gaps in the field of IoMT for smart cities. This bibliometric analysis provides valuable insights for researchers seeking to explore unexplored areas within the IoMT and smart cities domains. In this data analysis, Figure 4a illustrates the number of documents published per year and the number of publications in healthcare systems. The most publications will be made in the year 2022 with 523, and as publications are growing each year, this is an excellent field for further research. Figure 4b shows the documents per year by source. IEEE Access has more than 60 publications. Figure 4c shows the congregation of keywords that occur together in a paper. The interrelations between keywords that co-appear in the research are linked together. Internet of Things, healthcare, blockchain, big data, wearable sensors, and smartphones are the most common keywords.  
Overall, the field of IoMT in healthcare for sustainable smart cities is rapidly growing and attracting researchers at various levels of expertise. The potential of IoMT for addressing hazardous situations and improving work efficiency is highly promising. The increasing number of publications in this field indicates a significant research gap that can be explored further. Smart healthcare systems are continually integrating new technologies to enhance precision and suitability in urban settings. However, it is crucial to assess both the benefits and limitations of these technologies to leverage their advantages and find solutions for any drawbacks. This ongoing cycle of evaluation and improvement  
Figure 4: The published documents per year: (**a**) with the number of publications; (**b**) source; (**c**) the congregation of co-appearing keywords from the Scopus database.  
allows us to progress in this direction and discover new technologies while addressing their limitations.