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Efficient communication is paramount for time-critical applications. Emerging time-critical healthcare applications will require extremely low latency, high reliability, and security guarantees. There are existing and emerging network technologies such as 5G that could enable efficient communications for these time-critical applications. However, it requires detailed identification of the required Quality of Service (QoS) of the applications and careful selection of the appropriate connectivity technology or combination of technologies to fully realize these time-critical healthcare applications. Network slicing is known as a proposed backbone of 5G technology that aggregates logical network functions and configurations of parameters to support a particular service. In this paper, we address the QoS requirements of medical IoT applications, with a particular focus on their time-critical nature, and show how network slicing could be a key technology for meeting such requirements.