Pre-hospital ultrasound

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Prehospital ultrasound is the specialized application of ultrasound by physicians and other [1] emergency medical services [2] (EMS) to guide immediate care and treatment procedures. Like conventional ultrasound, it is a device that produces cyclic sound pressure to penetrate a medium (different body tissues) and reveal details about the inner structure of the medium. [3]

Contents

Differences from conventional ultrasound

Many emergency physicians now view screening ultrasound as a tool, and not a procedure or study. It is primarily used to quickly and correctly ascertain a limited set of internal injuries, specifically those injuries where conventional methods of determining them, such as trauma to the torso or heart, would either take too long, require too much time to prepare, or introduce greater risk to the patient. [4]

While conventional ultrasound can be a lengthy process, and is usually conducted with non-mobile units and advanced image filtering and manipulation built into the unit, emergency ultrasound is supposed to be as simple and quick to operate as possible, focusing on a small set of criteria. [5]

Applications and potential indications

Procedural guiding

In most cases, prehospital providers will employ the use of a portable ultrasound unit. In every instance, an attempt is made to find the area best suited to an ultrasound and utilize bare skin if possible. Resolution is vastly decreased if soundings must be made through any form of clothing. [8]

There are two main areas of emergency ultrasound. The Focused Assessment with Sonography for Trauma (or FAST) focuses on trying to ascertain if there is internal bodily fluid in blunt abdominal trauma, in the areas between organs, which is a sign of severe internal injury. [9] Echocardiography is used to attempt to find valvular disease, clots, cardiomyopathies or penetrations of the heart. Both systems are scanning methodologies, they use identical equipment. [10]

Ultrasound visualization and measurement of the optic nerve sheath diameter (ONSD) has been shown to be useful as a surrogate for more invasive intracranial pressure monitoring, allowing for more advanced monitoring of brain injuries in the field. [11]

Strengths

  1. It images muscle, soft tissue, and bone surfaces very well and is particularly useful for delineating the interfaces between solid and fluid-filled spaces, unlike most other methods of trauma diagnosis, which are little more than educated guesses. [ citation needed ]
  2. It renders "live" images, where the operator can dynamically select the most useful section for review, and narrows down the problem area, rather than having to wait until the patient is at the hospital.
  3. It has no known long-term side effects and rarely causes any discomfort to the patient.

Weaknesses

  1. Sonographic devices have trouble penetrating bone. For example, sonography of the adult brain is very limited. This means that in terms of trauma diagnosis involving brain injury, sonography will be difficult and requires high-end ultrasound machines. [ citation needed ]
  2. The depth penetration of ultrasound is limited, making it difficult to image structures deep in the body, especially in obese patients.[ citation needed ]
  3. The method is operator-dependent. A high level of skill and experience is needed to acquire good-quality images and make accurate diagnoses, which is one more skill that a limited EMS team must develop. Since most EMS teams are small and have high turnover, retaining qualified personnel can be difficult.[ citation needed ]
  4. Pre-hospital ultrasound like every exam or procedure taken out in the pre-hospital environment carries the risk to delay patient transfer to a place where more accurate diagnosis and definitive care can be given, e.g. a hospital.

See also

Related Research Articles

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Emergency medical services (EMS), also known as ambulance services or paramedic services, are emergency services that provide urgent pre-hospital treatment and stabilisation for serious illness and injuries and transport to definitive care. They may also be known as a first aid squad, FAST squad, emergency squad, ambulance squad, ambulance corps, life squad or by other initialisms such as EMAS or EMARS.

<span class="mw-page-title-main">Emergency medical technician</span> Health care provider of emergency medical services

An emergency medical technician is a medical professional that provides emergency medical services. EMTs are most commonly found serving on ambulances and in fire departments in the US and Canada, as full-time and some part-time departments require their firefighters to be EMT certified.

<span class="mw-page-title-main">Medical ultrasound</span> Diagnostic and therapeutic technique

Medical ultrasound includes diagnostic techniques using ultrasound, as well as therapeutic applications of ultrasound. In diagnosis, it is used to create an image of internal body structures such as tendons, muscles, joints, blood vessels, and internal organs, to measure some characteristics or to generate an informative audible sound. The usage of ultrasound to produce visual images for medicine is called medical ultrasonography or simply sonography, or echography. The practice of examining pregnant women using ultrasound is called obstetric ultrasonography, and was an early development of clinical ultrasonography. The machine used is called an ultrasound machine, a sonograph or an echograph. The visual image formed using this technique is called an ultrasonogram, a sonogram or an echogram.

<span class="mw-page-title-main">Airway management</span> Medical procedure ensuring an unobstructed airway

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<span class="mw-page-title-main">Major trauma</span> Injury that could cause prolonged disability or death

Major trauma is any injury that has the potential to cause prolonged disability or death. There are many causes of major trauma, blunt and penetrating, including falls, motor vehicle collisions, stabbing wounds, and gunshot wounds. Depending on the severity of injury, quickness of management, and transportation to an appropriate medical facility may be necessary to prevent loss of life or limb. The initial assessment is critical, and involves a physical evaluation and also may include the use of imaging tools to determine the types of injuries accurately and to formulate a course of treatment.

<span class="mw-page-title-main">Traumatic cardiac arrest</span> Medical condition

Traumatic cardiac arrest (TCA) is a condition in which the heart has ceased to beat due to blunt or penetrating trauma, such as a stab wound to the thoracic area. It is a medical emergency which will always result in death without prompt advanced medical care. Even with prompt medical intervention, survival without neurological complications is rare. In recent years, protocols have been proposed to improve survival rate in patients with traumatic cardiac arrest, though the variable causes of this condition as well as many coexisting injuries can make these protocols difficult to standardize. Traumatic cardiac arrest is a complex form of cardiac arrest often derailing from advanced cardiac life support in the sense that the emergency team must first establish the cause of the traumatic arrest and reverse these effects, for example hypovolemia and haemorrhagic shock due to a penetrating injury.

<span class="mw-page-title-main">Advanced trauma life support</span> American medical training program

Advanced trauma life support (ATLS) is a training program for medical providers in the management of acute trauma cases, developed by the American College of Surgeons. Similar programs exist for immediate care providers such as paramedics. The program has been adopted worldwide in over 60 countries, sometimes under the name of Early Management of Severe Trauma, especially outside North America. Its goal is to teach a simplified and standardized approach to trauma patients. Originally designed for emergency situations where only one doctor and one nurse are present, ATLS is now widely accepted as the standard of care for initial assessment and treatment in trauma centers. The premise of the ATLS program is to treat the greatest threat to life first. It also advocates that the lack of a definitive diagnosis and a detailed history should not slow the application of indicated treatment for life-threatening injury, with the most time-critical interventions performed early.

<span class="mw-page-title-main">Paracentesis</span> Form of body fluid sampling procedure

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<span class="mw-page-title-main">Trauma team</span> Team of healthcare workers treating severe injury

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<span class="mw-page-title-main">Blunt trauma</span> Trauma to the body without penetration of the skin

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<span class="mw-page-title-main">Paramedics in the United States</span> Overview of paramedics in the United States of America

In the United States, the paramedic is an allied health professional whose primary focus is to provide advanced emergency medical care for patients who access Emergency Medical Services (EMS). This individual possesses the complex knowledge and skills necessary to provide patient care and transportation. Paramedics function as part of a comprehensive EMS response under physician medical direction. Paramedics often serve in a prehospital role, responding to Public safety answering point (9-1-1) calls in an ambulance. The paramedic serves as the initial entry point into the health care system. A standard requirement for state licensure involves successful completion of a nationally accredited Paramedic program at the certificate or associate degree level.

Advanced Emergency Medical Technician - Critical Care (AEMT-CC) is a former Emergency Medical Services (EMS) certification that was unique to New York. The curriculum for AEMT-CC's in New York was similar to that of the national standard EMT-I/99 but with a broader scope of practice. EMT-CCs are fully classified as Advanced Life Support (ALS) providers within New York and are trained in advanced airway management, including intubation, IV fluid administration, cardiac monitoring, cardiac pacing, and both synchronized and unsynchronized cardioversion, and medication usage/administration in adult and pediatric patients.

<span class="mw-page-title-main">Focused assessment with sonography for trauma</span> Fluid accumulation screening

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<span class="mw-page-title-main">Gunshot wound</span> Injury caused by a bullet

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<span class="mw-page-title-main">Spinal precautions</span> Efforts to prevent movement of the spine in those with a risk of a spine injury

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<span class="mw-page-title-main">Pre-hospital emergency medicine</span>

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References

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  2. von Foerster, Nicholas; Radomski, Marek A.; Martin-Gill, Christian (2 January 2024). "Prehospital Ultrasound: A Narrative Review". Prehospital Emergency Care. 28 (1): 1–13. doi:10.1080/10903127.2022.2132332.
  3. Emergency Ultrasound Made Easy. Justin Bowra, Russell E. McLaughlin. Elsevier Churchill Livingstone, 2006 ISBN   0-443-10150-7, ISBN   978-0-443-10150-2 [ page needed ]
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  5. Atlas of Emergency Medicine. Kevin J. Knoop, Lawrence B. Stack, Alan B. Storrow. McGraw-Hill Professional, 2002. ISBN   0-07-135294-5, ISBN   978-0-07-135294-9 [ page needed ]
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  9. Introduction To Emergency Ultrasound: A Review Of Justifications, Indications And Significant Findings. Steven A. Godwin M.D. March, 1999. Jacksonville Medicine Journal. http://www.dcmsonline.org/jax-medicine/1999journals/march99/ultrasound.htm
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  11. Boitnott, J. Optic Nerve Sheath Ultrasound. EMSPOCUS. http://emspocus.com/2015/12/07/optic-nerve-sheath-ultrasound/