In trauma, the FAST exam has replaced which technique for evaluating hemodynamically unstable patients?

In trauma, the FAST exam has replaced which technique for evaluating hemodynamically unstable patients?

• A. Diagnostic peritoneal lavage
• B. CT scan
• C. Ultrasound
• D. X-ray

Answer: (A)

The key idea is that in quickly assessing trauma patients who are not stable, a rapid bedside ultrasound to look for free intraperitoneal fluid is more efficient and safer than older invasive testing. This ultrasound-focused FAST exam has largely replaced diagnostic peritoneal lavage for evaluating hemodynamically unstable patients because it is quick, noninvasive, repeatable at the bedside, and can immediately guide management, such as proceeding to urgent surgery if bleeding is suspected. Diagnostic peritoneal lavage, while historically used to detect intra-abdominal bleeding, requires catheter placement, carries risks (infection, bowel injury), and takes more time, delaying critical decisions. A positive FAST in an unstable patient strongly suggests intra-abdominal bleeding and prompts laparotomy, while a negative FAST does not completely rule out injury and must be interpreted in the broader clinical context. CT and X-ray have roles mainly when the patient is stabilized or for different types of injury assessment, but they’re not as suitable for the initial evaluation of an unstable patient.

The key idea is that in quickly assessing trauma patients who are not stable, a rapid bedside ultrasound to look for free intraperitoneal fluid is more efficient and safer than older invasive testing. This ultrasound-focused FAST exam has largely replaced diagnostic peritoneal lavage for evaluating hemodynamically unstable patients because it is quick, noninvasive, repeatable at the bedside, and can immediately guide management, such as proceeding to urgent surgery if bleeding is suspected. Diagnostic peritoneal lavage, while historically used to detect intra-abdominal bleeding, requires catheter placement, carries risks (infection, bowel injury), and takes more time, delaying critical decisions. A positive FAST in an unstable patient strongly suggests intra-abdominal bleeding and prompts laparotomy, while a negative FAST does not completely rule out injury and must be interpreted in the broader clinical context. CT and X-ray have roles mainly when the patient is stabilized or for different types of injury assessment, but they’re not as suitable for the initial evaluation of an unstable patient.