Ultrasound and Respiratory Physiological Signals in Lung Diseases

Official title

Synergistic Assessment of Ultrasound Data and Respiratory physiOlogical Signals in luNg Diseases

Overview

The use of lung ultrasound is instrumental in the evaluation of many chest pathologies and its ability to detect pleuro-pulmonary pathology is widely accepted. However, the use of ultrasound to explore the state of the peripheral lung parenchyma, when the organ is still aerated, is a relatively new application. Horizontal and vertical artifacts are separate and distinct artifacts that can be seen during ultrasound examination of the lungs. While the practical role of lung ultrasound artifacts is accepted to detect and monitor many conditions, further research is needed for the physical interpretation of ultrasound artifacts. These artifacts are diagnostic signs, but we don't fully understand their origin. The artifactual information deriving from the surface acoustic interaction, beyond the pleural line, in the ultrasound images of the normally aerated and non-deflated lung, represents the final result of complex interactions of acoustic waves with a specific three-dimensional structure of the biological tissue. Thus, the umbrella term "vertical artifacts" oversimplifies many physical phenomena associated with a pathological pleural plane. There is growing evidence that vertical artifacts are caused by physiological and pathological changes in the superficial lung parenchyma. Therefore, the need emerges to explore the physical phenomena underlying the artifactual ultrasound information deriving from the surface acoustic interaction of ultrasound with the pleuro-pulmonary structures.

Detailed description

In the last years, lung ultrasonography has gained ever-growing clinical interest and curiosity because of its peculiar ability to acquire clinical information at bedside, its non-invasiveness and low cost. In particular settings (emergency medicine, intensive care unit) its utility has been well demonstrated.

Clinicians use chest ultrasound for detecting pleural diseases, consolidations, bronchiolitis, interstitial lung pathology and critical pulmonary conditions of adults, children, and infants.

However, the development of lung ultrasonography for exploring non-consolidated organs, has been not supported by a strong knowledge of the physical mechanisms that underlie pulmonary artifacts.

Lung ultrasonography is comparable to a standard morphological sonography only when assessing a pulmonary consolidation, a tissue without air, which is in direct contact with the visceral pleural. In this case, the clinicians evaluate anatomic images, representing the real structure of the diseased organ. Differently, when the lung surface is denser but not yet consolidated, the large acoustic impedance gradient between the chest wall and the pulmonary tissue containing air prevents every anatomic representation, and the scan results in the visualization of many kinds of vertical artifacts known as B-Lines.

Even though the practical role of lung ultrasound artifacts is accepted for detecting and monitoring many conditions, many of the published studies are empirical and further research is needed to clarify the physical genesis of vertical artifacts. These artifacts are diagnostic signs, but we do not fully understand their origin. The artifactual information beyond the pleura line in ultrasonographic images of the normal and of the not critically deflated lung represents the ultimate outcome of complex interactions of a specific acoustic wave with a specific three-dimensional structure of the biological tissue.

There is growing evidence that vertical artifacts are caused by physiological and pathological changes in the superficial lung parenchyma.

The study intends to explore the relationship among ultrasound, tomographic and patch-based cardio-respiratory data, obtained from a heterogeneous population of patients suffering from: 1) pre-consolidative pulmonary changes such as diffuse interstitial lung diseases during exacerbation, 2) infectious interstitial pneumonia and 3) chronic obstructive pulmonary disease during both stable phase and exacerbations.

Interventions

• Diagnostic test Lung ultrasound, computed tomographic scan and patch-based cardio-respiratory evaluations
  Ultrasonographic findings will be obtained with machines supplied with clinical Units. Additionally, US scans as acquired with open research platform will also be gathered. For both scanners, ultrasonographic scans will be performed and videos will be recorded and stored in each landmark. Metal cutaneous landmarks will be positioned and left during computed tomographic (CT) scans, indicating the areas of ultrasonographic assessment. Finally, on the same day of enrolment, a wearable system for m

Primary outcome measures

• Evidence of lung parenchymal involvement evaluated by lung ultrasound. [Time frame: At enrollment.]
• Evidence of paraseptal and/or panlobular emphysema. [Time frame: At enrollment.]
• Evidence of computed tomographic features and patterns of interstitial lung diseases. [Time frame: At enrollment.]

Eligibility criteria

Inclusion criteria

• inpatients admitted to the hospital due to diffuse interstitial lung diseases during exacerbation OR infectious interstitial pneumonia not caused by SARS-CoV-2 OR acute exacerbation of chronic obstructive pulmonary disease.
• Outpatients with pulmonary paraseptal and/or panlobular emphysema and/or chronic obstructive pulmonary disease during stable phase.
• Patients able to give written informed consent.

Exclusion criteria

• history of skin irritation, redness, itching or allergic cutaneous symptoms.
• Allergic reactions to adhesives or hydrogels.
• Family history of adhesive skin allergies.
• Presence of severe skin conditions such as wounds, burns or on any damaged skin.
• Presence of strong magnetic fields in the study setting.
• Presence of electromagnetic disturbances or significant ionizing radiation sources which might lead to signal artifacts.
• Use of external cardiac defibrillators.
• Use of diaphragmatic pacers.
• Use of extra cardiac stimulators.
• Pregnancy.
• Pediatric population.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Allocation

N/A

Model

Single group

Masking

Open label

Primary purpose

Diagnostic

Study locations

Italy · 1 center

• Fondazione Policlinico Universitario A. Gemelli IRCCS — Rome

Publications

• Soldati G, Demi M, Inchingolo R, Smargiassi A, Demi L. On the Physical Basis of Pulmonary Sonographic Interstitial Syndrome. J Ultrasound Med. 2016 Oct;35(10):2075-86. doi: 10.7863/ultra.15.08023. Epub 2016 Aug 8. No abstract available. PMID 27503755
• Mento F, Khan U, Faita F, Smargiassi A, Inchingolo R, Perrone T, Demi L. State of the Art in Lung Ultrasound, Shifting from Qualitative to Quantitative Analyses. Ultrasound Med Biol. 2022 Dec;48(12):2398-2416. doi: 10.1016/j.ultrasmedbio.2022.07.007. Epub 2022 Sep 23. PMID 36155147
• Mento F, Soldati G, Prediletto R, Demi M, Demi L. Quantitative Lung Ultrasound Spectroscopy Applied to the Diagnosis of Pulmonary Fibrosis: The First Clinical Study. IEEE Trans Ultrason Ferroelectr Freq Control. 2020 Nov;67(11):2265-2273. doi: 10.1109/TUFFC.2020.3012289. Epub 2020 Jul 27. PMID 32746228
• Demi L, van Hoeve W, van Sloun RJG, Soldati G, Demi M. Determination of a potential quantitative measure of the state of the lung using lung ultrasound spectroscopy. Sci Rep. 2017 Oct 6;7(1):12746. doi: 10.1038/s41598-017-13078-9. PMID 28986558
• Demi L, Demi M, Prediletto R, Soldati G. Real-time multi-frequency ultrasound imaging for quantitative lung ultrasound - first clinical results. J Acoust Soc Am. 2020 Aug;148(2):998. doi: 10.1121/10.0001723. PMID 32872996
• Soldati G, Inchingolo R, Smargiassi A, Sher S, Nenna R, Inchingolo CD, Valente S. Ex vivo lung sonography: morphologic-ultrasound relationship. Ultrasound Med Biol. 2012 Jul;38(7):1169-79. doi: 10.1016/j.ultrasmedbio.2012.03.001. Epub 2012 May 12. PMID 22579543
• Smargiassi A, Inchingolo R, Soldati G, Copetti R, Marchetti G, Zanforlin A, Giannuzzi R, Testa A, Nardini S, Valente S. The role of chest ultrasonography in the management of respiratory diseases: document II. Multidiscip Respir Med. 2013 Aug 9;8(1):55. doi: 10.1186/2049-6958-8-55. PMID 23937897
• Soldati G, Demi M, Smargiassi A, Inchingolo R, Demi L. The role of ultrasound lung artifacts in the diagnosis of respiratory diseases. Expert Rev Respir Med. 2019 Feb;13(2):163-172. doi: 10.1080/17476348.2019.1565997. Epub 2019 Jan 10. PMID 30616416

Identifiers

NCT: NCT06068647 · ID4710

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗