NLS diagnostics of lung and pleural diseases is described as a non-linear diagnostic approach for evaluating pathological changes in the lungs and pleura. The reported study investigated the NLS-semiotics of several purulent-destructive thoracic diseases, including lung abscess, abscessed pneumonia, pleural empyema, and pulmonary gangrene.
The study included 267 patients with purulent-destructive diseases of the lungs and pleura. The reported NLS examination was used to evaluate pathological structures, their localization, size, chromogeneity, spectral characteristics, and changes over time.
According to the study, NLS diagnostics of lung and pleural diseases provides three-dimensional visualization and allows detailed evaluation of different biological structures based on their spectral properties.
NLS Diagnostics of Lung and Pleural Diseases: Study Overview
The study examined 267 patients treated at University College London Hospital between 2009 and 2011.
The patients were divided into four major groups:
- Lung abscess: 112 patients
- Abscessed pneumonia: 79 patients
- Pleural empyema: 54 patients
- Pulmonary gangrene: 22 patients
NLS-graphy findings were verified using surgical interventions and thoracic punctures with microbiological analysis of punctate material.
The thorax examination was performed using the Metatron-4025 system with 4.9 GHz high-frequency sensors. During NLS diagnostics of lung and pleural diseases, the researchers evaluated the localization, size, chromogeneity, and spectral structure of pathological findings.
Spectral-entropic analysis was also used to evaluate changes in the NLS image over time.
NLS Diagnostics of Lung Abscess
A major part of NLS diagnostics of lung and pleural diseases focused on the NLS-semiotics of lung abscess.
The main pathological finding described in patients with lung abscess was an intrapulmonary cavity. The diagnostic characteristics were associated with changes in the chromogeneity of the cavity contents and its wall.
Spectral-entropic analysis was used to evaluate the contents and their distribution within the cavity. This assessment was related to the efficiency of spontaneous drainage through the bronchi.
The study described four types of acute lung abscess according to spontaneous bronchial drainage:
- Blocked abscess
- Abscess with insufficient spontaneous drainage
- Abscess with free spontaneous drainage
- Abscess with an air pocket
These forms represented different stages of the reported purulent-destructive process.
NLS Classification of Lung Abscess
The proposed classification in the study was based on the structure of the abscess and the relationship between hyperchromogenic purulent exudate and achromogenic air inclusions.
In a blocked abscess, NLS diagnostics of lung and pleural diseases showed a roundish lesion with hyperchromogenic liquid content and isochromogenic suspensions.
When purulent material entered the bronchi, the abscess entered an open stage. The NLS image became heterogeneous because of achromogenic air signals within the hyperchromogenic fluid.
The efficiency of spontaneous drainage was evaluated according to the quantity and distribution of achromogenic air inclusions.
An abscess with an air cavity was described after the purulent exudate had been removed from the remaining cavity. The study noted that conventional radiography could be preferable for evaluating these air cavities because it can visualize the entire cavity.
Acute and Chronic Lung Abscess
The study compared acute purulent and gangrenous abscesses using several diagnostic criteria, including spontaneous drainage, the presence of a hyperchromogenic wall, and necrotized lung tissue.
In acute purulent processes, the reported NLS findings included smaller lesions, insufficient spontaneous drainage, diffuse air inclusions, and an absence of visible walls and sequesters.
During successful treatment, the study observed a reduction in cavity size, a decrease in fluid content, increasing air content, and eventual formation of a scar.
Chronic lung abscesses showed similar NLS patterns but were characterized by a more clearly visualized wall. The wall was described as having relatively homogeneous chromogenic structure and an even thickness.
The pseudo-tumorous form of chronic lung abscess was considered particularly difficult to differentiate because its dense purulent content and distinct contour could resemble peripheral lung cancer.
NLS Diagnostics of Abscessed Pneumonia
NLS diagnostics of lung and pleural diseases was also applied to patients with abscessed pneumonia.
The reported NLS findings were associated with interalveolar exudation and inflammatory infiltration. Fibrinous exudate within the alveoli allowed visualization of the pneumonic infiltrate in greater depth.
The study divided pneumonic infiltration into massive, significant, and moderate forms according to the quantity and distribution of hyperchromogenic areas.
With massive inflammatory infiltration, the pulmonary area demonstrated an almost homogeneous moderately chromogenic structure. Significant infiltration showed a greater number of heterogeneous hyperchromogenic areas, while moderate infiltration was characterized by multiple diffusely distributed hyperchromogenic inclusions.
Pleural fluid appeared as a hyperchromogenic space separating the pleural layers between the lung and thoracic wall.
NLS Diagnostics of Pleural Empyema
Another important application of NLS diagnostics of lung and pleural diseases was the evaluation of pleural empyema.
The study included 54 patients with purulent exudate in the pleural cavity. Limited pleural exudate was reported in 43 patients, while 11 patients had diffuse pleural empyema.
The main NLS diagnostic characteristic of pleural empyema was a hyperchromogenic suspension associated with purulent detritus.
This suspension could spread throughout the empyemic cavity and demonstrate a dense, heterogeneous appearance. Because this appearance could resemble a solid lesion, the study described spectral-entropic analysis as a method for differentiation.
The pleural layers were described as thickened, with an uneven surface.
NLS Diagnostics of Pyopneumothorax
In cases of pyopneumothorax, NLS diagnostics of lung and pleural diseases demonstrated large achromogenic areas corresponding to air within purulent exudate.
Depending on their size, these air areas could appear as small point-like inclusions or larger structures.
Free air within the pleural cavity was described as an achromogenic line above the fluid content.
These findings were associated with the presence of both purulent fluid and air in the pleural cavity.
NLS Diagnostics of Pulmonary Gangrene
Pulmonary gangrene demonstrated a more complex NLS pattern because the destructive process could spread through large areas of the lung and involve the pleura.
The study identified three NLS variants of pulmonary gangrene:
- A large liquid-containing cavity
- Multiple smaller cavities
- Pulmonary gangrene associated with pyopneumothorax
In the first variant, a large destructive cavity containing mainly liquid was observed against a background of extensive inflammatory infiltration.
The second variant was characterized by thickening and increased chromogeneity of a lobe or the entire lung, together with multiple roundish achromogenic areas corresponding to smaller destructive air cavities.
The third variant involved pyopneumothorax, with extensive pleural fluid containing heterogeneous suspension and achromogenic air inclusions.
NLS-Semiotics of Purulent-Destructive Lung Diseases
The study emphasizes the diversity of NLS-semiotics in purulent-destructive lung diseases.
According to the reported findings, the NLS image depends largely on whether the pulmonary involvement is focal or diffuse. The analysis may help characterize the reported severity and type of destructive process.
The described conditions included:
- Acute purulent lung abscess
- Gangrenous lung abscess
- Abscessed pneumonia
- Pulmonary gangrene
- Pleural empyema
- Pyopneumothorax
A common factor in the NLS appearance of abscess and abscessed pneumonia was the condition of spontaneous drainage. This was evaluated according to the quantity and distribution of achromogenic air areas within the cavity.
NLS Diagnostics and Dynamic Monitoring
The study describes NLS research of the thorax as an approach that may provide additional information during the evaluation of purulent-destructive diseases.
NLS diagnostics of lung and pleural diseases was also described in relation to dynamic monitoring of pathological changes.
Changes in cavity size, fluid content, air inclusions, pleural involvement, and the structure of destructive lesions could be evaluated during the reported follow-up process.
The NLS image was therefore analyzed together with the overall clinical picture and other diagnostic findings.
Conclusion
NLS diagnostics of lung and pleural diseases was investigated in 267 patients with purulent-destructive diseases of the lungs and pleura.
The study described NLS-semiotics for lung abscess, abscessed pneumonia, pleural empyema, pulmonary gangrene, and pyopneumothorax. It also proposed classifications based on the characteristics of destructive cavities and spontaneous bronchial drainage.
The reported findings demonstrate the range of NLS patterns described for purulent-destructive thoracic diseases and highlight the use of NLS imaging for evaluating pathological changes and their dynamics.
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