Name: point-of-care lung ultrasound in adults: image acquisition
Uploaded: 2023-03-03T14:45:00.000+00:00
Duration: 9 min 17 s
Description: Watch this Scientific Journal Video about Point-of-Care Lung Ultrasound in Adults: Image Acquisition at JoVE.com

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
1. Instrument settings and probe selection
NOTE: Lung POCUS can be performed with a multitude of transducers depending on what question needs to be answered.
<ol>
	<li>Superficial lung investigation
	<ol>
		<li>For the evaluation of abnormalities that have manifestations superficially (e.g., pneumothorax or pleural line abnormalities), perform lung POCUS using a linear high-frequency (5-10 MHz) probe, with the focal zone set at the pleural line. If a linear high-frequency probe is unavailable, perform superficial lung ultrasound using a low-frequency probe (see section 1.2), although the spatial resolution will be lower, which increases the chances of ambiguous or difficult-to-interpret findings.</li>
	</ol>
	</li>
	<li>Deep lung investigation
	<ol>
		<li>Use a low-frequency (&#8804;5 MHz) ultrasound probe for the evaluation of anything deeper than the interface of the visceral and parietal pleurae. Ensure that the low-frequency probe has a footprint small enough to fit in between the rib spaces (e.g., a convex array, a micro-convex array, or a linear phased-array sector arc probe). 
		NOTE: The linear phased-array sector arc probe is often colloquially referred to as a &#34;phased-array probe&#34;. However, this term is misleading, because all modern ultrasound transducers (including linear high-frequency probes) use phasing to steer the ultrasound beam13,14. For the sake of brevity, the linear phased-array sector arc probe is referred to as a &#34;sector probe.&#34;</li>
		<li>Preset the machine as follows: abdomen (or lung if there is no abdomen option), varying depth (6-20 cm, depending on the object of interest), harmonic imaging disabled, and indicator to the left of the screen. Perform most of the study in a two-dimensional (2D), grayscale mode called brightness mode (B-mode). 
		&#8203;NOTE: Other ultrasound modes such as motion mode (M-mode) and color doppler (CD) can occasionally provide additional information and may be used when screening for certain pathologic states.</li>
	</ol>
	</li>
</ol>
2. Patient positioning
<ol>
	<li>Supine versus sitting
	<ol>
		<li>Perform the studies with the patient sitting up or supine.</li>
	</ol>
	</li>
	<li>Delimitation of the imaging regions
	<ol>
		<li>Divide each hemi-thorax into three regions, reflecting the anatomic segmentation of the lungs (Figure 115). In the left chest, treat the lingula as the left-sided analog of the right middle lobe.</li>
	</ol>
	</li>
</ol>
3. Scanning technique
<ol>
	<li>Apply ultrasound gel to the transducer.</li>
	<li>Scanning the right hemithorax
	<ol>
		<li>R1: right upper lobe (anterior lung zone) (Figure 215)
		<ol>
			<li>Place the probe in the mid-clavicular line in the 1st-3rd intercostal spaces (ICSs). Position the probe in the parasagittal orientation, with the indicator mark pointing cranially.</li>
			<li>Axis: Center on the pleural line so that the cranial and caudal rib shadows are visible on the edges of the images.</li>
			<li>Depth: If the dominant pattern is A-lines (see &#34;Normal lung ultrasound findings&#34; in the representative results section) with &#8804; two B-lines (see &#34;Pathologic lung POCUS findings&#34; in the representative results section), decrease the depth so that only a single A-line is visible. If there are &#62;three B-lines, increase the depth until at least three A-lines are visible. 
			NOTE: B-lines are vertical hyperechoic artifacts that arise from the pleural line, become wider from superficial to deep, reach the deepest visible portion of the ultrasound screen, and efface the A-lines where the two intersect.</li>
			<li>Overall gain: Adjust the gain until the pleural line and A-lines are visible as distinctly echogenic (bright) lines and the spaces between the pleural line and A-lines are hypoechoic (dark).</li>
			<li>Click on acquire.</li>
		</ol>
		</li>
		<li>R2: right middle lobe (antero-lateral lung zone) (Figure 315)
		<ol>
			<li>Place the probe in the anterior axillary line in the 4th-5th ICSs. Position the probe midway between the parasagittal and coronal orientations, with the indicator mark pointing cranially.</li>
			<li>Axis: See step 3.2.1.2.</li>
			<li>Depth: See step 3.2.1.3.</li>
			<li>Overall gain: See step 3.2.1.4.</li>
			<li>Click on acquire.</li>
		</ol>
		</li>
		<li>R3: right lower lobe (posterior-lateral lung zone) (Figure 415)
		<ol>
			<li>Place the probe in the mid-to-posterior axillary line in the 5th-7th ICSs. Position the probe in the coronal plane with the indicator mark pointing cranially.</li>
			<li>Axis: Center on the diaphragm such that both the sub-diaphragmatic and supra-diaphragmatic structures are visible at the same time.</li>
			<li>Depth: Increase the depth until the sub-diaphragmatic spine is visible.</li>
			<li>Overall gain: Increase the gain until the liver/spleen appears slightly hyperechoic.</li>
			<li>Click on acquire.</li>
		</ol>
		</li>
	</ol>
	</li>
	<li>Scanning the left hemithorax
	<ol>
		<li>L1: left upper lobe (anterior lung zone)
		<ol>
			<li>Probe positioning: See step 3.2.1.1.</li>
			<li>Axis: See step 3.2.1.2.</li>
			<li>Depth: See step 3.2.1.3.</li>
			<li>Overall gain: See step 3.2.1.4.</li>
			<li>Click on acquire.</li>
		</ol>
		</li>
		<li>L2: lingula of the left upper lobe (lateral lung zone)
		<ol>
			<li>Probe positioning: See step 3.2.2.1.</li>
			<li>Axis: See step 3.2.1.2.</li>
			<li>Depth: See step 3.2.1.3.</li>
			<li>Overall gain: See step 3.2.1.4.</li>
			<li>Click on acquire.</li>
		</ol>
		</li>
		<li>L3: left lower lobe (postero-lateral lung zone)
		<ol>
			<li>Probe positioning: See step 3.2.3.1.</li>
			<li>Axis: See step 3.2.3.2.</li>
			<li>Depth: See step 3.2.3.3.</li>
			<li>Overall gain: See step 3.2.3.4.</li>
			<li>Click on acquire.</li>
		</ol>
		</li>
	</ol>
	</li>
</ol>

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H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Advanced+echocardiography+for+the+critical+care+physician:+part+2.">Advanced echocardiography for the critical care physician: part 2.</a> Chest. 145 (1), 135-142 (2014).</li><li>Balik, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ultrasound+estimation+of+volume+of+pleural+fluid+in+mechanically+ventilated+patients.">Ultrasound estimation of volume of pleural fluid in mechanically ventilated patients.</a> Intensive Care Medicine. 32 (2), 318 (2006).</li><li>Zieleskiewicz, L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Comparative+study+of+lung+ultrasound+and+chest+computed+tomography+scan+in+the+assessment+of+severity+of+confirmed+COVID-19+pneumonia.">Comparative study of lung ultrasound and chest computed tomography scan in the assessment of severity of confirmed COVID-19 pneumonia.</a> Intensive Care Medicine. 46 (9), 1707-1713 (2020).</li><li>Bronshteyn, Y. 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YB serves on the American Society of Anesthesiologists&#39; Editorial Board on Point-of-Care Ultrasound and is the Section Editor for POCUS for OpenAnesthesia.org.

Diagnostic POCUS is the use of ultrasound at the bedside by a patient&#39;s primary treatment provider to answer clinical questions. The questions most amenable to diagnostic POCUS are those that are qualitative or binary in nature and that need to be answered faster than would be possible or practical with consultative ultrasound services.
A few steps are critical for image acquisition. The first one is probe selection. The authors recommend that the initial assessment be performed using the ...

Over the past several decades, bedside decision-making and treatment have increasingly been augmented by point-of-care ultrasound (POCUS). POCUS is the use of ultrasound for diagnostic or procedural guidance by a patient&#39;s primary treatment provider. This is in contrast to consultative ultrasound, where the ultrasound exam is requested by a patient&#39;s primary treatment provider but is performed by a separate specialist team1.
This narrative review focuses on diagnostic POCUS of a specific organ system: the lungs. Diagnostic POCUS of the lungs has proven useful in the acute care setting, allowing the diagnosis of potentially life-threatening conditions in scenarios of respiratory failure, shock, trauma, chest pain, and other situations2. Further, procedural lung POCUS is being used to guide needle placement in percutaneous thoracentesis3 and lung recruitment maneuvers4. However, despite its clinical significance, lung POCUS proficiency among physicians&#160;is variable5, limiting the appropriate use of this modality. The purpose of this review is to describe a time-efficient yet thorough image acquisition protocol for diagnostic lung POCUS in adults and to illustrate abnormal findings commonly found in clinical practice. The method described herein is not suitable for newborns and small infants. For information regarding lung POCUS imaging techniques and interpretation in this particular age group, the reader is invited to refer to specific literature6,7.
There are multiple imaging protocols described in the literature, varying from four-point to 28-point exams depending on how much time is available and what questions the exam is seeking to answer8. While the diagnostic accuracy for certain pathologies might be higher when more points are scanned, a focused six-point protocol offers a reasonable trade-off between efficiency and diagnostic accuracy2,9,10,11,12.

<table><tbody><tr><td>Edge 1 ultrasound machine</td><td>SonoSite</td><td>n/a</td><td>Used to obtain two of the abnormal images/clips (Figures 11 and 12)</td></tr><tr><td>Affiniti ultrasound machine</td><td>Philips</td><td>n/a</td><td>Used to obtain all normal and all abnormal images/clips except for Figures 11 and 12</td></tr></tbody></table>

point-of-care lung ultrasound in adults: image acquisition

Consultative ultrasound performed by radiologists has traditionally not been used for imaging the lungs, as the lungs&#39; air-filled nature normally prevents direct visualization of the lung parenchyma. When showing the lung parenchyma, ultrasound typically generates a number of non-anatomic artifacts. However, over the past several decades, these artifacts have been studied by diagnostic point-of-care ultrasound (POCUS) practitioners, who have identified findings that have value in narrowing the differential diagnoses of cardiopulmonary dysfunction. For instance, in patients presenting with dyspnea, lung POCUS is superior to chest radiography (CXR) for the diagnosis of pneumothorax, pulmonary edema, lung consolidations, and pleural effusions. Despite its known diagnostic value, the utilization of lung POCUS in clinical medicine remains variable, in part because training in this modality across hospitals remains inconsistent. To address this educational gap, this narrative review describes lung POCUS image acquisition in adults, including patient positioning, transducer selection, probe placement, acquisition sequence, and image optimization.

Normal lung ultrasound findings (Video 1, Video 2, Video 3, Video 4, Video 5, Video 6, and Supplementary File 1) 
Due to the marked discrepancy in acoustic impedance between the air in the lungs and the superficial tissues, normally all the ultrasound energy that reaches the interface of the parietal and visceral pleurae is immediately reflected back to the ultrasound transducer. As a result, at the depth of the lung parenchyma, the image seen on the screen of an ultrasound machine normally shows non...

Watch this Scientific Journal Video about Point-of-Care Lung Ultrasound in Adults: Image Acquisition at JoVE.com

Point-of-Care Lung Ultrasound in Adults: Image Acquisition

Point-of-care ultrasound (POCUS) of the lungs provides quick answers in rapidly changing clinical scenarios. We present an efficient and informative protocol for image acquisition for use in acute care settings.

Consultative ultrasound performed by radiologists has traditionally not been used for imaging the lungs, as the lungs&#39; air-filled nature normally ...

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5.8K Views.  Duke University School of Medicine. Point-of-care ultrasound (POCUS) of the lungs provides quick answers in rapidly changing clinical scenarios. We present an efficient and informative protocol for image acquisition for use in acute care settings.

Video: Point-of-Care Lung Ultrasound in Adults: Image Acquisition

Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus

Ultrasound is a safe bedside imaging tool that obviates the use of ionizing radiation diagnostic procedures. Due to its convenience, the lung ultrasound has received increasing attention from neonatal physicians. Nevertheless, clear reference standards and guideline limits are needed for accurate application of this diagnostic modality. This document aims to summarize expert opinions and to provide precise guidance to help facilitate the use of the lung ultrasound in the diagnosis of neonatal lung diseases.

Lung ultrasound is a noninvasive and valuable tool for bedside evaluation of neonatal lung diseases. However, a relative lack of reference standards, protocols and guidelines may limit its application. Here, we aim to develop a standardized neonatal lung ultrasound diagnostic protocol to be used in clinical decision-making.

Ultrasound is a safe bedside imaging tool that obviates the use of ionizing radiation diagnostic procedures. Due to its convenience, the lung ultrasound ...

International Expert Consensus and Recommendations for Neonatal Pneumothorax Ultrasound Diagnosis and Ultrasound-guided Thoracentesis Procedure

Pneumothorax (PTX) represents accumulation of the air in the pleural space. A large or tension pneumothorax can collapse the lung and cause hemodynamic compromise, a life-threatening disorder. Traditionally, neonatal pneumothorax diagnosis has been based on clinical images, auscultation, transillumination, and chest X-ray findings. This approach may potentially lead to a delay in both diagnosis and treatment. The use of lung US in diagnosis of PTX together with US-guided thoracentesis results in earlier and more precise management. The recommendations presented in this publication are aimed at improving the application of lung US in guiding neonatal PTX diagnosis and management.

Pneumothorax is a common emergency and critical disease in newborn infants that needs rapid, clear diagnosis and timely treatment. Diagnosis and treatment based on chest X-rays are associated with delayed management and radiation damage. Lung ultrasound (US) provides useful guidance for rapid, accurate diagnosis and the precise thoracentesis of pneumothorax.

Pneumothorax (PTX) represents accumulation of the air in the pleural space. A large or tension pneumothorax can collapse the lung and cause hemodynamic ...

Point-Of-Care Ultrasound Screening for Proximal Lower Extremity Deep Venous Thrombosis

Acute lower extremity deep venous thrombosis (DVT) is a serious vascular disorder that requires accurate and early diagnosis to prevent life-threatening sequelae. While whole leg compression ultrasound with color and spectral Doppler is commonly performed in radiology and vascular labs, point-of-care ultrasound (POCUS) is becoming more common in the acute care setting. Providers appropriately trained in focused POCUS can perform a rapid bedside examination with high sensitivity and specificity in critically ill patients. This paper describes a simplified yet validated approach to POCUS by describing a three-zone protocol for lower extremity DVT POCUS image acquisition. The protocol explains the steps in obtaining vascular images at six compression points in the lower extremity. Beginning at the level of the proximal thigh and moving distally to the popliteal space, the protocol guides the user through each of the compression points in a stepwise manner: from the common femoral vein to the femoral and deep femoral vein bifurcation, and, finally, to the popliteal vein. Further, a visual aid is provided that may assist providers during real-time image acquisition. The goal in presenting this protocol is to help make proximal lower extremity DVT exams more accessible and efficient for POCUS users at the patient&#39;s bedside.

Traditionally, lower extremity deep venous thrombosis (DVT) is diagnosed by radiology-performed venous duplex ultrasound. Providers appropriately trained in focused point-of-care ultrasound (POCUS) can perform a rapid bedside examination with high sensitivity and specificity in critically ill patients. We describe the scanning technique for focused POCUS DVT lower extremity examination.

Acute lower extremity deep venous thrombosis (DVT) is a serious vascular disorder that requires accurate and early diagnosis to prevent life-threatening ...

Point-of-Care Ultrasound: A Review of Ultrasound Parameters for Predicting Difficult Airways

Airway management remains a crucial part of perioperative care. The conventional approach to assessing potentially difficult airways emphasizes the LEMON method, which looks for and evaluates the Mallampati classification, signs of obstruction, and neck mobility. Clinical findings help predict a higher likelihood of difficult tracheal intubation, but no clinical result reliably excludes difficult intubation. Ultrasound as an adjunct to clinical examination can provide the clinician with a dynamic anatomical airway assessment, which is impossible with clinical examination alone. In the hands of anesthesiologists, ultrasound is becoming more popular in the perioperative period. This method is particularly applicable for identifying proper endotracheal tube positioning in specific patient populations, such as those who are morbidly obese and patients with head and neck cancer or trauma. The focus is on identifying the normal anatomy, correctly positioning the endotracheal tube, and refining the parameters that predict difficult intubation. Several ultrasound measurements are clinical indicators of difficult direct laryngoscopy in the literature. A meta-analysis revealed that the distance from the skin to the epiglottis (DSE) is most associated with a difficult laryngoscopy. An ultrasound of the airway could be applied in routine practice as an adjunct to the clinical examination. A full stomach, rapid sequence intubation, gross visual anatomical abnormalities, and restricted neck flexibility prevent using ultrasound to assess the airway. The airway evaluation is performed with a linear array transducer of 12-4 MHz, with the patient in the supine position, with no pillow, and with the head and neck in a neutral position. The central axis of the neck is where the ultrasound parameters are measured. These image acquisitions guide the standard ultrasound examination of the airway.

A point-of-care ultrasound (POCUS) is a simple, non-invasive, and portable tool that enables dynamic airway assessment. Several studies have attempted to determine the role of ultrasound parameters as an adjunct to clinical examination in predicting difficult laryngoscopies.

Airway management remains a crucial part of perioperative care. The conventional approach to assessing potentially difficult airways emphasizes the LEMON ...

A Modified Sonographic Algorithm for Image Acquisition in Life-Threatening Emergencies in the Critically Ill Newborn

The use of routine point-of-care ultrasound (POCUS) is increasing in neonatal intensive care units (NICUs), with several centers advocating for 24 h equipment availability. In 2018, the sonographic algorithm for life-threatening emergencies (SAFE) protocol was published, which allows the assessment of neonates with sudden decompensation to identify abnormal contractility, tamponade, pneumothorax, and pleural effusion. In the study unit (with a consulting neonatal hemodynamics and POCUS service), the algorithm was adapted by including consolidated core steps to support at-risk newborns, aiding clinicians in managing cardiac arrest, and adding views to verify correct intubation. This paper presents a protocol that can be applied in the NICU and the delivery room (DR) in relation to three scenarios: cardiac arrest, hemodynamic deterioration, or respiratory decompensation. 
This protocol can be performed with a state-of-the-art ultrasound machine or an affordable handheld device; the image acquisition protocol is carefully detailed. This method was designed to be learned as a general competence to obtain the timely diagnosis of life-threatening scenarios; the method aims to save time but does not represent a substitute for comprehensive and standardized hemodynamic and radiological analyses by a multidisciplinary team, which might not universally be on call but needs to be involved in the process. From January 2019 to July 2022, in our center, 1,045 hemodynamic consultation/POCUS consults were performed with 25 patients requiring the modified SAFE protocol (2.3%), and a total of 19 procedures were performed. In five cases, trained fellows on call resolved life-threatening situations. Clinical examples are provided that show the importance of including this technique in the care of critical newborns.

Here, we present a protocol that can be applied in the neonatal intensive care unit and the delivery room in relation to three scenarios: cardiac arrest, hemodynamic deterioration, or respiratory decompensation. This protocol can be performed with a state-of-the-art ultrasound machine or an affordable handheld device; an image acquisition protocol is carefully detailed.

The use of routine point-of-care ultrasound (POCUS) is increasing in neonatal intensive care units (NICUs), with several centers advocating for 24 h ...

Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition

The goal of this protocol is to develop a standardized method for acquiring images of the optic nerve sheath and measuring the optic nerve sheath diameter (ONSD). Diagnostic ultrasound of the ONSD to detect intracranial hypertension has traditionally faced many problems because of methodologic discrepancies. Due to inconsistencies in the measuring techniques, the potential for ONSD to become a non-invasive bedside monitoring tool for ICP has been hampered. However, establishing a transparent, consistent methodology for measuring the ONSD would support its use as a valid and reliable method of identifying intracranial hypertension. This is important as it has both high sensitivity and specificity in acute care settings. This narrative review describes ONSD POCUS image acquisition, including patient positioning, transducer selection, probe placement, the acquisition sequence, and image optimization. Further, visual aids are provided to assist in real-time during image acquisition. This method should be considered for patients for whom there are concerns regarding intracranial hypertension but who do not have an intracranial monitor in place.

Point-of-care ultrasound (POCUS) of the optic nerve sheath diameter (ONSD) has been shown to be useful in identifying patients with increased intracranial pressure (ICP). However, the non-standardized technique for this POCUS has hampered its use. We present a standardized image acquisition protocol for use in the acute care setting.

The goal of this protocol is to develop a standardized method for acquiring images of the optic nerve sheath and measuring the optic nerve sheath diameter ...

Gastric Ultrasound Technique for Mitigating Peri-Procedural Aspiration Risk

Gastric Point of Care Ultrasound in Adults: Image Acquisition and Interpretation

Over the past two decades, diagnostic point-of-care ultrasound (POCUS) has emerged as a rapid and non-invasive bedside tool for addressing clinical inquiries related to gastric content. One emerging concern pertains to patients about to undergo sedation and/or endotracheal intubation: the elevated risk of aspiration from the patient&#39;s stomach contents. Aspiration of gastric contents into the lungs poses a serious and potentially life-threatening complication. This occurs more frequently when the stomach is considered &#34;full&#34; and can be affected by the techniques employed for airway management, making it potentially preventable. To mitigate the risk of peri-procedural aspiration, two distinct medical specialties (anesthesiology and critical care medicine) have independently developed techniques to utilize ultrasonography for identifying patients requiring &#34;full stomach&#34; precautions. Due to these separate specialties, the work of each group remains relatively unfamiliar outside its respective field. This article presents descriptions of both techniques for gastric ultrasound. Furthermore, it explains how these approaches can complement each other when one of them falls short. Regarding image acquisition, the article covers the following topics: indications and contraindications, selection of the appropriate probe, patient positioning, and troubleshooting. The article also delves into image interpretation, complete with example images. Additionally, it demonstrates how one of the two techniques can be employed to estimate gastric fluid volume. Lastly, the article briefly discusses medical decision-making based on the findings of this examination.

Author Spotlight: Point-of-Care Ultrasound for Gastric Content Assessment and Risk Stratification in Perioperative Care 

This protocol introduces two methods for image acquisition in gastric ultrasonography. Additionally, tips are provided for interpreting this information to assist in medical decision-making.

Over the past two decades, diagnostic point-of-care ultrasound (POCUS) has emerged as a rapid and non-invasive bedside tool for addressing clinical ...

Ultrasound in Evaluating Diaphragm Dysfunction and Monitoring Treatment

Measuring Diaphragm Thickness and Function Using Point-of-Care Ultrasound

The diaphragm is the main component of the respiratory muscle pump. Diaphragm dysfunction can cause dyspnea and exercise intolerance, and predisposes affected individuals to respiratory failure. In mechanically ventilated patients, the diaphragm is susceptible to atrophy and dysfunction through disuse and other mechanisms. This contributes to failure to wean and poor long-term clinical outcomes. Point-of-care ultrasound provides a valid and reproducible method for evaluating diaphragm thickness and contractile activity (thickening fraction during inspiration) that can be readily employed by clinicians and researchers alike. This article presents best practices for measuring diaphragm thickness and quantifying diaphragm thickening during tidal breathing or maximal inspiration. Once mastered, this technique can be used to diagnose and prognosticate diaphragm dysfunction, and guide and monitor response to treatment over time in both healthy individuals and acute or chronically ill patients.

Author Spotlight: Unraveling the Impact of Mechanical Ventilation on Diaphragm Function and Patient Outcomes 

Diaphragm thickness and function can be assessed in healthy individuals and critically ill patients using point-of-care ultrasound. This technique offers an accurate, reproducible, feasible, and well-tolerated method for evaluating diaphragm structure and function.

The diaphragm is the main component of the respiratory muscle pump. Diaphragm dysfunction can cause dyspnea and exercise intolerance, and predisposes ...

Advancing Bedside Care: A Multidisciplinary Guide to Kidney-Genitourinary POCUS

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition

A range of conditions involving the kidneys and urinary bladder can cause organ-threatening complications that are preventable if diagnosed promptly with diagnostic imaging. Common imaging modalities include either computed tomography or diagnostic ultrasound. Traditionally, ultrasound of the kidney-genitourinary system has required consultative teams consisting of a sonographer performing image acquisition and a radiologist performing image interpretation. However, diagnostic point-of-care ultrasound (POCUS) has recently emerged as a useful tool to troubleshoot acute kidney injury at the bedside. Studies have shown that non-radiologists can be trained to perform diagnostic POCUS of the kidneys and bladder with high accuracy for a set number of important conditions. Currently, diagnostic POCUS of the kidney-genitourinary system remains underused in actual clinical practice. This is likely because image acquisition for this organ system is unfamiliar to most clinicians in specialties that encounter acute kidney injury, including primary care, emergency medicine, intensive care, anesthesiology, nephrology, and urology. To address this multi-specialty educational gap, this narrative review was developed by a multi-disciplinary group to provide a specialty-agnostic framework for kidney-genitourinary POCUS image acquisition: indications/contraindications, patient positioning, transducer selection, acquisition sequence, and exam limitations. Finally, we describe foundational concepts in kidney-genitourinary ultrasound image interpretation, including key abnormal findings that every bedside clinician performing this modality should know.

Author Spotlight: Developing a Bedside Protocol for Kidney and Genitourinary Ultrasonography

Point-of-care ultrasound (POCUS) of the renal and genitourinary (renal-GU) system can help to screen for certain causes of kidney dysfunction. However, despite its clinical utility, renal-GU POCUS remains underutilized due to a lack of training among clinicians. To address this gap, this article describes renal-GU image acquisition and interpretation.

A range of conditions involving the kidneys and urinary bladder can cause organ-threatening complications that are preventable if diagnosed promptly with ...

Diaphragmatic Ultrasound in Adults: Image Acquisition and Interpretation

Diaphragm dysfunction is a widely recognized concern across numerous medical specialties and clinical settings. Timely and accurate assessment of the diaphragm is vital not only in critically ill patients, where it has a role in weaning from mechanical ventilation&#160;and respiratory outcomes, but also in the perioperative arena as a diagnostic tool to detect phrenic nerve function. Diaphragmatic assessment has traditionally utilized fluoroscopy and nerve studies that are time-consuming, costly, and non-portable. Point-of-care ultrasound (POCUS) overcomes these barriers and can be used as a tool for non-invasive screening of diaphragm function. However, POCUS for diaphragmatic dysfunction currently suffers from several issues such as a lack of consensus guidelines, a multiplicity of protocols, and poor interoperator reliability among existing protocols, most notably with the assessment of dome of diaphragm excursion and diaphragmatic thickening. To address these issues, this manuscript reviews the available literature on diaphragmatic POCUS and identifies an image acquisition technique that is both simple to perform and has high interoperator reliability. This technique first describes a qualitative evaluation of diaphragm excursion, followed by a quantitative assessment of the excursion of the zone of apposition. The technique is described stepwise along with all the following: patient positioning, transducer selection, probe placement, image optimization, and interpretation.

Point-of-care ultrasound (POCUS) is an essential technique for screening for diaphragmatic dysfunction due to its portability, non-invasiveness, and real-time imaging capabilities. Although current diaphragmatic POCUS protocols exist, they suffer from poor interoperator reliability and lack consensus guidelines. Here we describe a technique that is reproducible and simple to perform.

Diaphragm dysfunction is a widely recognized concern across numerous medical specialties and clinical settings. Timely and accurate assessment of the ...