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Emergency Physicians commonly perform invasive procedures. These procedures have traditionally been taught using surface landmarks, with the assumption that anatomy is reliably similar from patient to patient. The increasing use of ultrasound (US) to assist in procedural guidance has demonstrated this is not the case. Using US to assist with procedures has numerous benefits (Table 8-1). It is safer for patients due to reducing complications. US improves patient comfort and satisfaction primarily because fewer attempts are required. The use of US usually decreases the duration of the procedure.
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The sonographer must make several decisions prior to beginning a procedure using US. Will the procedure be performed under real-time US guidance, or will US be used only to map the anatomy? Will one person (the sonographer) or two people (the sonographer and an assistant) be necessary? Which US transducer is the most appropriate for the procedure? Should the instrument or needle be imaged using the in-plane technique or the out-of-plane technique? Are needle guides necessary? What is the ideal location of the US machine in relation to the sonographer and patient? These general questions must be kept in mind when using US for invasive procedures and are discussed below.
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This chapter reviews basic information regarding the use of US to assist or guide procedures in the Emergency Department (ED). US can assist in many commonly performed ED procedures (Table 7-1). The specific US technique for a procedure is described in the chapter for that procedure.
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GUIDANCE VERSUS MAPPING
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US can be used in one of two ways for procedural assistance: the dynamic technique or the static technique. The dynamic technique is also known as US guidance. The sonographer uses US guidance in real time during the procedure to survey the anatomy, to confirm a diagnosis, and to visualize the needle or instrument as it enters tissue and reaches the target. The static technique is also known as US mapping. The sonographer uses US mapping prior to starting the procedure to map the local anatomy, to confirm a diagnosis, and to mark the site of needle entry. The US transducer is then put away and the procedure performed in the traditional fashion without ...