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Файл:Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_5198_Библиотеки_им_академика_М_И_Перельмана.pdf
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- •Foreword
- •Preface: Trauma as a Team Sport
- •Contents
- •History
- •Documented Outcomes
- •Future Direction
- •References
- •Humble Beginnings
- •A New Paradigm Is Born
- •References
- •3: Evidence Supporting Crisis Resource Management Training
- •Introduction
- •References
- •Introduction
- •The Trauma Team
- •Trauma Team Leadership
- •Crisis Resource Management
- •Observe, Orient, Decide, Act OODA Loop
- •Observe
- •Orient
- •Conclusion
- •References
- •Introduction: Why Does Teamwork Matter?
- •Introduction
- •Team Culture: Not Just Leaders; Followers Too
- •Crisis Communication 101
- •Conclusion
- •References
- •Background
- •Leadership Styles
- •Self-Awareness
- •Self-Management
- •Social Awareness
- •Relationship Management
- •Validation
- •Putting It All Together
- •References
- •7: Followership
- •Intro
- •What Is Followership
- •Why Is Followership Important?
- •Summary
- •References
- •Introduction
- •Situational Awareness
- •Situational Awareness: Level One
- •Situational Awareness: Level Two
- •Situational Awareness: Level Three
- •Attention
- •Stress
- •Conclusion
- •References
- •Handover Foundations
- •Handover Challenges
- •Handover Structure
- •Written Handover
- •Conclusion
- •References
- •10: Engaging Team Members
- •Respect
- •Resources
- •Engaging Virtual Teams
- •Virtual Water Cooler
- •Conclusion
- •References
- •Implicit Coordination
- •The Zero-Point Survey
- •Adaptive Coordination
- •Making It Happen
- •References
- •Acute Versus Chronic Stress
- •Recognizing Chronic Versus Acute Stress
- •Education Helps
- •Hyper-realistic Simulation Training
- •Resilience Is Individualized
- •Training Is Key
- •References
- •13: Stress Exposure Training
- •Introduction
- •Stress Training
- •Information Provision
- •Cognitive Control
- •Physiological Control
- •Overlearning
- •Mental Practice
- •Decision-Making
- •Team/Communication Skills
- •References
- •Introduction
- •Conclusions, Implications, Next Steps
- •References
- •15: Trauma Video Review
- •Introduction/What Is Trauma Video Review?
- •Team Simulation/Education
- •Performance Improvement
- •Research
- •Potential Barriers
- •Consent Processes
- •Other Considerations
- •Future Directions
- •Conclusion
- •References
- •Pre-arrival
- •Patient Arrival
- •Resuscitation
- •Pre-departure
- •Communication Skills
- •Structured Handovers
- •Conclusions
- •References
- •Origination
- •United States Prehospital System Legal Structure
- •Science Behind Prehospital Injury Patterns
- •Team Synergy vs Rock Star Player
- •Medical Errors
- •Controversy What Should Our System Implement
- •Training Quality
- •Active Killer
- •Realistic Training
- •Lessons Learned
- •Response
- •Nonmedical Personnel
- •Conclusion
- •References
- •Introduction
- •Future Direction
- •Conclusions
- •References
- •19: Prehospital Trauma
- •Introduction
- •Safety
- •Scene Assessment
- •Trauma Dynamics
- •Prehospital Ultrasound
- •Trauma Management: Tranexamic Acid (TXA) Administration
- •Conclusion
- •References
- •20: Transport Medicine
- •Introduction
- •The Trauma Clinical Network (TCN)
- •Direct Transport
- •Inter-hospital Transport
- •Emergency or Non-emergency Transportation
- •Monitoring During Transport
- •Conclusion
- •References
- •Introduction
- •Trauma Team Leader (TTL)
- •Airway
- •Respiratory Therapy
- •Emergency Medicine Physician
- •General Surgery
- •Orthopedic Surgery
- •Neurosurgery
- •Recording Nurse
- •Trauma Team Activation
- •The Trauma Bay
- •Trauma Team Function
- •Summary
- •References
- •22: Interprofessional Team Roles
- •References
- •23: The Trauma Bay Environment
- •Introduction
- •Surge Capacity
- •Decontamination
- •Communication
- •Control Center
- •Security Considerations
- •The Trauma Bay
- •Trauma Observation Unit Setup
- •Special Situations
- •Hybrid Operating Rooms
- •Conclusion
- •References
- •Introduction
- •Design
- •Formalizing Clinician-Designer-Builder Partnerships
- •A Human-Centered Approach
- •The Missing Link
- •Evidence-Based Design
- •Build
- •Train
- •Excel
- •Putting It Together
- •Summary
- •References
- •Introduction
- •Human Factor Analysis
- •Hybrid Operating Environment Lexicon
- •Summary
- •References
- •Introduction
- •Project Implementation
- •Results
- •Conclusion
- •Appendix A: Dam Tools Usability Testing Questionaire
- •References
- •Introduction
- •References
- •Introduction
- •Team-Based Principles
- •Continuous Improvement Processes
- •Conclusion
- •References
- •29: Trauma Resuscitation
- •Mechanisms
- •Neurologic Injury
- •Musculoskeletal Trauma Including Spine
- •Conclusions
- •References
- •30: Damage Control Resuscitation
- •Introduction
- •Massive Transfusion
- •Permissive Hypotension
- •Vascular Damage Control Techniques
- •Non-vascular Damage Control Techniques
- •Abdominal Compartment Syndrome
- •Open Abdominal Management
- •Damage Control Environments
- •References
- •Damage Control Part 1: Operative Intervention
- •Damage Control Part 2: Resuscitation
- •Damage Control Strategy Under Special Circumstances
- •Blast Injuries
- •Burns
- •Head Injury
- •Crush Injury
- •Conclusions
- •References
- •32: Trauma Team Decision-Making
- •Predictive Scores
- •Clinical Practice Guidelines (CPGs)
- •Trauma Team Leadership: Translating Decisions into Action
- •Future Directions: Toward High Reliability Organizing
- •Conclusions
- •References
- •33: Emergency Critical Care Procedures
- •Introduction
- •Airway Management
- •Tube Thoracostomy
- •Controversies
- •Antibiotics
- •Tube Selection
- •Occult Pneumothorax
- •Vascular Access
- •Peripheral Intravenous Access
- •Central Intravenous Access
- •Intraosseous Access
- •Ultrasound
- •Resuscitative Thoracotomy
- •Outcomes
- •Contraindications
- •Volume Expansion
- •Management
- •Diagnostic Peritoneal Lavage
- •Summary
- •References
- •Introduction
- •REBOA Programs
- •Partial REBOA
- •Intermittent REBOA
- •Vena Cava Occlusion
- •Tourniquets
- •Junctional Tourniquets
- •Abdominal Aortic Compression.
- •Hemostatic Agents
- •Topical Hemostatic Agents
- •Chemical Hemostatics
- •Physiologic Hemostatics
- •Hemostatic Dressings
- •Intra-abdominal Foam
- •Summary
- •References
- •What Is Interventional Radiology
- •Diagnostic Imaging Workup
- •Embolic Therapies
- •Gelfoam
- •Mural Repair
- •References
- •Non-verbal
- •Verbal
- •Wider Structural Perspective
- •Transferrable Solutions
- •Conclusion
- •References
- •Introduction
- •Pharmacotherapy
- •Paravertebral Block
- •Serratus Plane Block
- •References
- •Clinical Decision Support
- •Quality Improvement
- •Research
- •Trauma Systems
- •Conclusion
- •References
- •Outcomes
- •The Future
- •References
- •Introduction
- •Challenges
- •Provider Stress
- •Non-verbal Communication
- •Standardized Communication
- •Strategy 1: Scripted Procedures
- •Strategy 2: Structure Triage Tool
- •Conclusions
- •References
- •Introduction
- •Fetal Monitoring
- •Radiology
- •Conclusions
- •References
- •Introduction
- •Elderly Population
- •Psychiatric Comorbidities
- •Anticoagulated Patients
- •Conclusion
- •References
- •Introduction
- •Advanced Trauma Life Support (ATLS)—The Basics
- •Advanced TBI Guideline-Based Care
- •Noninvasive ICP/CPP Determination Methods
- •Brain Tissue Oxygen Monitoring (PbtO2)
- •Extracellular Brain Chemistry—Cerebral Microdialysis
- •Transcranial Doppler
- •Near-Infrared Spectroscopy
- •Continuous Electroencephalography (cEEG)
- •Cerebrovascular Reactivity Monitoring
- •Cerebral Compensatory Reserve
- •Individualized ICP Thresholds (iICP)
- •Integrating “Omics” into Acute Phase TBI Care—The Future
- •Conclusions
- •References
- •44: Basic Trauma Ultrasound
- •Introduction
- •The FAST Examination
- •Technique
- •Uses
- •Blunt Abdominal Trauma
- •Penetrating Trauma
- •Limitations
- •Summary
- •References
- •Introduction
- •Trauma Ultrasound Development
- •Pneumothorax
- •Musculoskeletal Ultrasound
- •Head Trauma
- •Contrast-Enhanced Ultrasound
- •Conclusions
- •References
- •Introduction
- •Imaging Modalities
- •Plain X-ray
- •Computed Tomography (CT) Scan
- •Other Modalities
- •Critical Thinking
- •References
- •Introduction
- •Initial Trauma CT Protocol
- •Iodinated Contrast Administration
- •Emergency Trauma MRI
- •References
- •48: Disaster Medicine
- •Natural or Man-made Disaster
- •The Disaster’s Cycle
- •Incident Command System
- •Triage
- •“Second Hit” Phenomenon
- •Conclusions
- •References
- •49: The Multi-casualty Trauma
- •Introduction
- •Historical Perspective
- •Prehospital Management
- •Triage
- •Pediatric Considerations
- •Intrahospital Management
- •Transfer Corridors
- •Blood Bank
- •Conclusions
- •References
- •Introduction
- •Crew Resource Management (CRM)
- •Resources
- •Review Process Including Logistics
- •Transactive Memory
- •Team Building (Before)
- •Team Performance (During)
- •Team Debrief (After)
- •Health
- •Fitness
- •Interagency Collaboration
- •Bystanders
- •Emergency Medical Services/Tactical EMS
- •Conclusions
- •References
- •Introduction
- •Improvised Explosive Device
- •Anti-police Violence
- •Improved Community Preparedness
- •Conclusions
- •References
- •Introduction
- •Procedures
- •Conclusions
- •References
- •Introduction
- •The MARCHE Algorithm Approach
- •Massive Hemorrhage Management (“M”)
- •Tourniquets
- •Wound Packing
- •Hemostatic Dressings
- •Junctional Tourniquets
- •Airway Management (“A”)
- •Respiration (“R”)
- •Circulation (“C”)
- •Vascular Access
- •Crystalloid
- •Hemostatic Resuscitation
- •Tourniquet Re-assessment
- •Hypothermia Prevention/Head Injury (“H”)
- •Hypothermia Management
- •Traumatic Brain Injury
- •Eye Injuries
- •Analgesia
- •Secondary Survey
- •Antibiotic Administration
- •Prolonged Field Care
- •Summary
- •References
- •Introduction
- •Hypothermia
- •Etiology
- •Pathophysiology
- •Lethal Triad (Diamond) Component
- •Treatment
- •Afterdrop
- •Resuscitation Progression
- •Prognosis
- •Team Dynamics
- •Conclusion
- •References
- •55: Burns
- •Incidence
- •Etiology
- •Prognosis
- •Initial Management: “ABCDE” Approach
- •Admission
- •Dressings
- •Nutrition
- •Multidisciplinary Recovery
- •Summary
- •References
- •War Zones
- •Casualty Care Team Preparation
- •Biological Weapons
- •Biological Warfare Historical Considerations
- •Personal Protective Equipment
- •Anthrax
- •Botulism Toxin
- •Conclusion
- •References
- •57: Nuclear Injuries
- •Introduction
- •Historical Background
- •Transportation
- •Hospital Care
- •Conclusions
- •References
- •Further Reading
- •Introduction
- •Historical Perspective
- •Parabolic Testing
- •Surgical Field Testing
- •Diagnostics
- •Immediate Damage Control Procedures
- •Conclusions
- •References
- •Introduction
- •Pandemic Impact
- •Financial Support
- •Conclusion
- •References
- •Introduction
- •Staff
- •Retraining/Reassignment
- •Consultants
- •Space/Structure
- •Trauma Bay
- •Operating Room
- •ICU or Floor
- •Clinic
- •Systems
- •Country Level
- •Regional Level
- •Hospital Level
- •Division or Trauma Team Level
- •Conclusion
- •References

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Part V
Emergency Ultrasound and Trauma Imaging

Basic Trauma Ultrasound
MarkusZiesmann, AndrewW.Kirkpatrick,
andLawrenceMarshall Gillman
44
Introduction
During the assessment of an acutely unstable trauma patient,
favor is given to rapid investigations which will expedite
denitive care. In conjunction with the chest and pelvis
X-rays, the Focused Assessment with Sonography for
Trauma, or FAST, is perhaps the most readily available diagnostic tool that is capable of changing the management of
that patient. This role had historically been fullled by
Diagnostic Peritoneal Lavage (DPL), but the quicker, noninvasive FAST scan has replaced DPL as the standard of care.
Point-of-care ultrasound examination can be performed
quickly, can expedite decision-making, and can diagnose
surgical injuries faster, facilitating more rapid transition to
the operating theatre.
The goal of the FAST exam is to identify free uid in the
abdomen or around the pericardium. It is not possible to differentiate on FAST between blood, urine, amniotic uid, or
GI contents, but in the context of a hemodynamically unstable trauma victim, it is presumed that any free uid represents intraabdominal hemorrhage, and thus any exam
revealing free uid is a positive test. Notably, any of the mentioned non-bloody uids found in an unstable patient would
also represent a surgical diagnosis and, therefore, the goal of
FAST is to diagnose free uid, not blood. The extended
FAST (E-FAST) includes the addition of ultrasonography of
the thorax to look for pneumothoraces and is discussed further in Chap. 45: Trauma Ultrasound: Beyond the FAST
Exam.
M. Ziesmann (*) · L. Marshall Gillman
Health Sciences Centre, Winnipeg, MB, Canada
e-mail: mziesmann2@hsc.mb.ca; lawrence.gillman@umanitoba.ca
A. W. Kirkpatrick
Trauma Services, Foothills Hospital, Calgary, AB, Canada
e-mail: Andrew.Kirkpatrick@albertahealthservices.ca
The FAST Examination
Technique
Because most patients will be subject to spine mobility limitations at the time of the FAST exam, positioning simply
requires a supine patient with a table parallel to the oor. The
examination of all four sites may be performed in any order,
so long as all four sites are imaged systematically and accurately. Some sonographers prefer to start the exam with the
pericardial view which will allow for calibration of the
device’s gain setting based on intra-cardiac blood. Others
advocate starting the exam in the right upper quadrant, as
this is the region most likely to yield positive ndings.
Regardless of the order of exams, approaching the exam in a
systematic and organized way is necessary to both learn the
techniques and ensure that nothing is overlooked.
Examination of the thorax if proceeding to an E-FAST exam
occurs after the conventional FAST is complete.
The FAST exam is performed using a low frequency (2.5
to 5 MHz) curvilinear or phased array probe which will
allow for adequate depth of visualization during the study. In
brief, the ultrasound device creates images based on the
detection of reected sound waves such that dense tissue
appears bright white and non-echogenic tissue appears dark
black on the ultrasound’s display. The exam may be made
more difcult by the presence of obesity, gas-distended viscera, subcutaneous emphysema, or COPD [1], and the presence of preexisting ascites makes the exam uninterpretable.
An inverse relationship exists between the depth of penetration and resolution of the scan; patients with a large body
habitus may be difcult to investigate.
The pericardium is examined in the subxiphoid view
using the liver as an acoustic window. The pericardium forms
a potential space around the heart, sometimes containing a
trivial amount of uid that would not be detected on FAST
(Fig.44.1). Any anechoic uid seen within this space therefore represents a positive study and a presumed diagnosis of
hemopericardium. One common mistake in evaluating the
© Springer Nature Switzerland AG 2025
L. Marshall Gillman, S. Widder (eds.), Trauma Team Dynamics, https://doi.org/10.1007/978-3-031-86312-7_44
381

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M. Ziesmann et al.
a
Fig. 44.1 Pericardial view of the FAST exam - Image a shows a normal pericardium with no uid, while image b shows a positive pericardial
FAST with uid indicated by the arrow
pericardium is to declare a positive study after mistaking epicardial fat for free uid; an epicardial fat pad is adherent to
the cardiac tissue and will move with the cardiac contractions. A false negative pericardial FAST exam may result
from a large rent in the pericardium decompressing hemopericardium into the pleural space rather than developing a
cardiac tamponade; considering the pericardial FAST in context with other clinical signs is important.
If the sonographer cannot obtain satisfactory views in the
subxiphoid plane, a left parasternal approach may be
attempted. The probe should be placed immediately to the
left of the sternum at the fourth or fth intercostal space,
initially with the probe marker to the patient’s right. After
obtaining a view of the heart, the probe can be rotated with
the marker toward the right shoulder and then the left shoulder, for long-axis and short-axis views respectively. This
technique may be preferred in patients with signicant
obesity.
The view of the right upper quadrant also uses the liver as
a sonographic window. The probe is placed on the patient
between the anterior and mid-axillary line, positioning the
probe in the eighth to eleventh intercostal space, parallel to
the ribs. Angle the probe counter-clockwise to minimize rib
shadows if necessary. The probe indicator should be oriented
toward the patient’s head. Proper examination of the right
upper quadrant should visualize the liver edge, the inferior
pole of the right kidney, and Morison’s Pouch (the potential
space between the liver and the right kidney, or the hepatorenal space) (Fig.44.2). Landmarking Morison’s Pouch may
be made easier by identifying the bright white Gerota’s fascia of the kidneys posteriorly. No single probe orientation
will adequately visualize all of these landmarks and thus
sweeping of the probe, moving the probe superiorly or infe-
b
ling their breathing to allow adequate visualization.
Visualization of an anechoic (black) stripe between the liver
and kidney or near the tip of the liver is considered a positive
exam.
Proceeding in a clockwise manner to the left upper quadrant, the spleen is used as a sonographic window and the
probe is placed on the posterior axillary line at the eighth or
ninth intercostal space. Again, the probe indicator is pointed
toward the patient’s head and the probe may need to be
rotated to minimize rib shadows. Examining the left upper
quadrant requires visualization of the subphrenic and perisplenic spaces and the left kidney (Fig. 44.3). The probe
must be systematically swept, moved, or angled to visualize
all three spaces. Anechoic (black) blood may be seen between
the spleen and kidney or often above the spleen and just
under the diaphragm with either of these ndings being considered a positive test.
Finally, the pelvic view is obtained by using the bladder
as a sonographic window (Fig.44.4). While we describe this
as a pelvis view, the view obtained is actually the inferior
abdomen; the anatomic pelvis is a retroperitoneal location,
and the FAST does not function well at nding retroperitoneal uid. A good pelvic view is dependent on a full bladder,
as an empty bladder limits the ability to detect small amounts
of free uid. In patients with a urinary catheter inserted, the
examiner may clamp this catheter or instill up to 200cc of
warm isotonic uid to optimize the study. The pelvic view is
obtained with a sagittal probe orientation, again orienting the
marker toward the patient’s head. The probe is swept from
right to left or vice versa, paying attention to the retrovesicular space in males and the retro-uterine space in
females for the presence of anechoic (black) free uid. As
before the presence of anechoic uid is considered a positive
riorly, and/or angling cephalad and caudad may be required.
An awake and responsive patient may be coached on control-
and the pelvis reexamined.

44 Basic Trauma Ultrasound
383
Fig. 44.2 Right upper
quadrant (RUQ) view of the
FAST exam - Image a shows
a normal RUQ view with no
uid in the hepatorenal space
(arrow), while image b shows
a positive RUQ FAST with
uid indicated by the arrow
a
a
b
b
Fig. 44.3 Left upper quadrant (LUQ) view of the FAST exam - Image a shows a normal LUQ view with no uid in the splenorenal space (arrow),
while image b shows a positive LUQ FAST with uid indicated by the arrow
A positive FAST is one that demonstrates any free uid
anywhere. Even if some views are incomplete, the presence
of even a single positive view renders the exam positive. A
negative FAST is one that demonstrates no uid everywhere;
all four sites must be adequately and completely imaged
without positive ndings. If any view of any space is not
adequately visualized, but the visualized spaces are negative,
the exam must be scored “indeterminate” and the patient will
require further investigation.
tions, including a 28% reduction in CT scans, and an 89%
reduction in DPL performance [3].
One review compared the FAST to various examinations
and investigations in blunt trauma patients, concluding that a
positive FAST is better at detecting intra-abdominal injuries
than exam ndings of rebound tenderness, seatbelt signs,
hypotension, abdominal distention, and guarding and also
was better than adjunct investigations including reported
base decits, deranged liver enzymes, anemia, or an abnormal chest X-ray. The presence of free intraperitoneal uid on
bedside ultrasonography corresponds to a likelihood ratio of
Uses
30 that there is indeed an intraabdominal injury [4].
Perhaps the biggest advantage that FAST provides a
Blunt Abdominal Trauma
FAST is best studied in the context of blunt abdominal
trauma. The Sonographic Outcomes Assessment Program
(SOAP) trial was a prospective randomized study that concluded that FAST offered signicant benets including a
64% reduced time to operative intervention, decreased numbers of computed tomography (CT) scans, a 27% decrease in
length of hospital stay, fewer complications, and a signicant
cost savings [2]. Investigation with FAST has been shown to
signicantly change management plans in 33% of applica-
Trauma Team Leader is its ready availability as a bedside
tool. In circumstances of hemodynamic instability which
would normally preclude CT scanning, the sensitivity of
FAST is greatly increased. The sensitivity of ultrasound in
the hypotensive trauma population approaches 100% [5, 6].
In an unstable patient, sonographic examinations can be
completed in 2–4min [5, 7, 8]. Up to 90% of patients with
massive hemoperitoneum may be identied by examining
only Morison’s Pouch [6], with a mean examination time in
one study of only 19s for patients with positive ndings [5].

384
M. Ziesmann et al.
Fig. 44.4 Pelvic view of the
FAST exam - Image a shows
a normal pelvic view with no
uid, while image b shows a
positive pelvic FAST with
uid indicated by the arrow
a
The point-of-care nature of the FAST exam facilitates
repeat exams where necessary. When confronted by a
negative examination and no immediate indication for surgery, denitive diagnostic testing (usually with a CT scan) is
usually the next step. In scenarios where a CT scan is not
available, such as a mass casualty scenario or in a resourcelimited clinical setting, repeating the FAST exam can be considered. With time—and thus, in a bleeding patient, an
increased volume of intraperitoneal free uid—sensitivity of
the exam increases. Repeat examination may be useful in
assessing GI injuries that are poorly detected by FAST,
increasing the sensitivity from 38% to 85% when repeated in
12–24h in one study [9].
While FAST is most often associated with level 1 trauma
centers, the exam may have a role in triaging patients either
prehospital or from peripheral centers to centers of denitive
care. A patient requiring transfer to a trauma center with a
positive FAST exam may be considered for transport directly
to an operating theater which can be prepared in advance of
the patient’s arrival. In regions with access to prehospital
FAST, time in the emergency room is reduced, with shorter
door-to-CT and door-to-OR times [10, 11] while preserving
a high reported sensitivity and sensitivity of the exam [12].
After considering the evidence, we are left with the conclusion that FAST in the blunt trauma population requires an
assessment of hemodynamic stability as a decision point. As
we will discuss in the “Limitations” section, in the patient
who is hemodynamically stable, other diagnostic modalities
may yield more denitive diagnoses and subsequent management. FAST has replaced diagnostic peritoneal lavage
and, like DPL [13], FAST serves to alter management only in
the unstable patient. In a hypotensive population after blunt
abdominal trauma, FAST was able to identify 97% of patients
with surgical injuries; in a subset of patients too unstable to
undergo CT scanning, 64% of patients with a positive FAST
had surgical injuries, whereas zero patients with a negative
FAST had surgical injuries [14].
In summary, in the blunt trauma population, FAST
changes management only in the unstable population. In the
stable population, FAST may have limited use as part of the
ATLS Circulation assessment, for reassessment of a dynami-
b
cally changing patient, in austere or resource-limited environments, and potentially for the triaging of inbound patients
referred from non-trauma centers.
Penetrating Trauma
The role of FAST in penetrating injuries is somewhat lessened, as hollow organ injury does not necessarily present
with massive hemoperitoneum and thus FAST is less sensitive in this population [15]. One particularly useful application, however, is to conrm or rule out massive
hemoperitoneum in cases of junctional injuries for the purposes of surgical planning about which body cavity contains
the primary problem [16].
The most signicant application of FAST in the penetrating trauma population is to rule out cardiac injuries. Though
much of the evidence is derived from small studies, the sensitivity of FAST to pericardial blood after penetrating chest
trauma consistently approaches 100% [17–19]. Of patients
with a positive pericardial FAST, surgical intervention is the
next step [17]. In patients with a high clinical suspicion of
cardiac injury, examination is rapid, with a mean time to
examine the pericardium of under one minute [20]. The
FAST exam shows some ability to discriminate survivable
versus non-survivable patients presenting with traumainduced cardiac arrest, for the purposes of triaging candidacy
for a resuscitative thoracotomy. In patients with traumatic
arrest and cardiac standstill on FAST, resuscitative thoracotomy may be futile [21].
Limitations
The major limitations of FAST studies all pertain to its primary purpose: to detect free uid. The purpose, in other
words, is not to denitively diagnose all possible injuries.
When considering the evidence surrounding the use of FAST
exams, it is important to consider the outcome variables for a
given study. Outcomes of “agreement with ndings at laparotomy” or “agreement with CT scanning” invariably demonstrate low sensitivity. CT scanning is far more sensitive for
any injury that does not produce signicant amounts of free

44 Basic Trauma Ultrasound
385
uid, such as hollow organ injury, retroperitoneal injury, or
solid organ injury with minimal blood loss. The goal of a
FAST exam is singular: to identify free uid contributing to
hemodynamic instability. Thus, when interpreting the data
for or against the use of FAST, one must bear in mind the
outcomes against which it is compared.
Critics of the FAST exam note that it is a poor single test
for diagnosing the presence of an abdominal visceral injury.
Using CT as a reference standard, we know that 34% of
patients with known visceral injuries have no appreciable
hemoperitoneum [22]. Studies comparing FAST to CT scan
or laparotomy ndings have reported sensitivities ranging
from 41% to 94% [23–27]. When specically considering
sensitivity for hemoperitoneum, FAST has a sensitivity of
91%, considerably better than its sensitivity for detecting all
injuries (69%) [26].
Because we know that ultrasound may not detect all injuries, a negative FAST in a clinically deteriorating patient
requires further investigation or exploration. False-negative
FAST exams—that is, studies failing to detect free uid despite
the presence of intraabdominal injury—often result in clinical
deterioration of the patient. A large proportion of false-negative
FAST patients require operative intervention [16, 23, 24, 28,
29] with false-negative rates of 1.7–6.1% in blunt trauma [23,
24. 28] and 9–29% in penetrating trauma [16, 29, 30] reported.
Therefore, while a negative FAST may be reassuring, further
clinical deterioration always mandates further investigations.
Notably, patients with severe pelvic fractures are one known
cohort at increased risk of false- negative exams [31], and up to
19% of true-positive exams in this population represent uroperitoneum rather than hemoperitoneum [32]. Whenever possible, hemodynamically stable patients without indications for
urgent interventions should be investigated with cross-sectional
imaging to rule out missed injuries.
The smallest amount of free uid detectable by FAST
exam varies by the location of the exam and the origin of the
uid. For pelvic-originating free uid to be visible in the left
upper quadrant for example, the uid must have tracked up
the right paracolic gutter, through the right upper quadrant
and to the left upper quadrant, implying a signicant volume
of uid even if the actual observed amount is quite small.
Over 600 cc of pelvic uid is required before it can be
detected in the right upper quadrant [29], but in contrast,
trace physiologic free uid, ranging from 5 to 20cc, is occasionally identied on pelvis views which may contribute to
false-positives [30]. In female patients, uid isolated to the
anatomic cul-de-sac (Pouch of Douglas) is of traumatic origin only 1.8% of the time, whereas 57.7% of patients with
upper-quadrant free uid have injuries [32]. A small amount
of visualized uid does not necessarily represent a small
amount of bleeding and, therefore, the scoring of the FAST
exam is categorical and not quantitative and must be interpreted in a clinical context of the patient’s stability.
The FAST exam remains somewhat controversial in a
pediatric patient population, with mixed study results
reported. The FAST exam does have moderate to high sensitivity and specicity in hemodynamically unstable pediatric
blunt abdominal trauma patients, and does correlate positively with a need for surgical intervention; however, a high
sensitivity was only achieved in this population by delaying
FAST performance for several hours, which undermines the
goal of using FAST to make rapid triage and treatment decisions [33]. Like in adult patients, the routine use of FAST
exams in stable pediatric patients is not supported by evidence and demonstrates no benet as measured by ER length
of stay, missed injuries, or cost of care [34].
Finally, all ultrasound investigations are limited by operator abilities. Because FAST, like all ultrasound techniques,
depends on a single individual to perform the exam and
interpret the results—typically in real time—the quality of
the test depends both on the operator’s technical ability to
capture images and also on the operator’s ability to interpret
them. Thus, there are two main areas in which an individual
operator’s success rate may be negatively impacted.
One study investigating operator dependence assessed
resident physicians and attending physicians in their reviews
of pre-recorded pericardial ultrasounds in penetrating trauma
patients. Substantial differences in diagnostic specicity
were found between residents and attending physicians (67%
vs. 90%) and those self-reporting minimal versus large experience with the ultrasound technique (65% vs. 93%) [35].
Evidence of operator dependence also exists for the detection of hemoperitoneum. One attempt at assessing the FAST
learning curve found that novice sonographers have error
rates of 17% with incomplete exam rates of 25%; after completing twenty-ve studies, both rates decreased to 5% [36].
The optimum number of studies needed to certify competence in FAST performance has not been dened with consensus, and credentialing requirements vary around the globe
and by certifying organization.
Summary
The FAST examination is a powerful tool that can potentially
change patient management when used as part of a trauma
resuscitation. The exam is rapid, provides managementchanging information, does not signicantly delay other tests
or resuscitative efforts, and does not harm the patient when
performed without signicant delay. A positive FAST examination is an indication of laparotomy in the unstable patient.
Negative examinations, which risk possible missed injuries,
should always be followed with further investigations such
as CT scanning in the stable population. Negative FAST
investigations in the unstable trauma patient should prompt a
rapid reassessment of the ATLS primary survey, but

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M. Ziesmann et al.
ultimately persistent hemodynamic instability may be an
indication for exploratory surgery regardless of FAST results,
recognizing that user experience, training, and exam limitations may contribute to false-negative studies.
Rapid interpretation of FAST results allows the Trauma
Team Leader to assess the patient’s immediate needs and
may reduce delays to operative interventions, costs, and
adverse outcomes.
Key Points
• Ultrasound is an important tool in the resuscitation
of trauma patients; it is an adjunct to, not a replacement of, existing standards of resuscitation such as
the clinical exam or ATLS surveys.
• A negative FAST exam is one where all four regions
are thoroughly imaged and no uid is seen; an indeterminate exam is one where all four regions cannot
be adequately imaged.
• Any free uid in any quadrant, even in an otherwise
indeterminate exam, is a positive FAST exam.
• The sensitivity of ultrasound is diminished by inexperienced operators, obesity, COPD, excessive
bowel gas, and some associated injuries; a negative
exam in an unstable patient is not reassuring and
warrants further investigation.
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