Page 86 - Ultrasonography in Prehospital and Emergency Medicine - Rein Ketelaars
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Diagnosis normal ventilation pneumothorax
linear-array
curved-array
phased-array
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Chapter 3
Normal ventilation was diagnosed significantly faster than the diagnosis of a pneumothorax, regardless of transducer type. The Wilcoxon signed-rank test showed a significant difference overall (p < .0001) and within the three transducer groups as shown in Figure 3.5 (p < .0001 in all three groups).
Image quality
Image quality was scored on a 5-point Likert scale. The image quality of the linear-, curved-, and phased-array transducers was appreciated at a median of 4 (IQR 3–4), 3 (IQR 2–4); 2 (IQR 1–2), respectively. Overall image quality was rated a median of 3 (IQR 2–4). The distri- bution of the image quality scores per transducer type is displayed in Figure 3.6.
The Wilcoxon signed-rank test showed a significant difference in image quality between all three transducers (p < .0001).
Clustered boxplot of the time elapsed until a diagnosis was made compared between transducer types and diagnoses
Figure 3.5 Boxplot of the elapsed time until a diagnosis was made compared between transducer types and diagnoses
The elapsed time until a diagnosis was stated by the observers. The time is represented in median seconds. The box represents the 25–75% interquartile range. The whiskers indicate the 95% confidence interval.
There is a significant difference in the elapsed time until a diagnosis was made between normal ventilation and pneumothorax within all three transducers (p < .0001).
Time (s)
