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Changes in tissue perfusion are critically important in the newborn, particularly during periods of vulnerability, such as the transitional period after birth or following hypoxic ischaemic injury. Tissue impedance (or resistance to blood flow) is an important factor in the assessment of perfusion and may be evaluated using bedside ultrasound.1–3 Spatio-temporal imaging correlation involves using a three-dimensional ultrasound probe to make a slow sweep through a region, capturing multiple two-dimensional colour images. Using the measured heart rate as a timing guide, the colour images are rearranged and merged to create …
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