If after correctly placing an endotracheal tube and at a short time later, you notice that the 21-cm mark is now at the patient's teeth, you should: notify the paramedic immediately.
An endotracheal tube can be defined as a flexible, plastic tube which is made of polyvinyl chloride (PVC) that is typically placed between the vocal cords through the mouth and trachea to the windpipe, so as to provide oxygen and inhaled gases to the lungs during a surgical operation and/or medical emergency.
Additionally, an endotracheal tube helps to protect the lungs of a patient any from of contamination such as blood or gastric contents.
In this context, we can reasonably infer and logically deduce that as a trained medical practitioner, you should immediately notify the paramedic on duty whenever there is an anomaly with a patient's endotracheal tube such as change in position.
Read more on endotracheal tube here: https://brainly.com/question/14680662
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