Emerging applications of clinical ultrasonography

In the current document, we introduce the numerous emerging areas and frontiers in the use of point-of-care clinical ultrasonography. Of these, we review the following 3: 1) the use of clinical ultrasonography in infectious and tropical diseases (we address it's usefulness in the diagnosis and follow-up of the main syndromes, tropical diseases and in areas with scarce resources); 2) the usefulness of clinical ultrasonography in the assessment of response to volume infusion in severely ill patients (we review basic concepts and the main static and dynamic variables employed for this evaluation); and 3) the use of clinical ultrasonography in the assessment of muscle mass in elderly patients with primary sarcopenia (we review the main muscles and measurements employed for them it.