Direct Measurement of Intrabronchial Pressure. Its Application to the Location of the Check-Valve Mechanism

1958 ◽  
Vol 13 (1) ◽  
pp. 35-41 ◽  
Author(s):  
E. Dekker ◽  
J. G. Defares ◽  
H. Heemstra
Keyword(s):  
Direct Measurement ◽  
Check Valve ◽  
Valve Mechanism ◽  
Intrabronchial Pressure

Giant bulla formation in the lung because of a check-valve mechanism

2017 ◽  
Vol 55 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Aya Hirata ◽  
Takeshi Saraya ◽  
Nobuaki Arai ◽  
Shin Karita ◽  
Riken Kawachi ◽  
...  
Keyword(s):  
Check Valve ◽  
Valve Mechanism ◽  
Giant Bulla

Diurnally fluctuating frontal dysequilibrium secondary to a pineal pilocytic astrocytoma: is this symptom associated with a check-valve mechanism in a pineal region tumor?

2008 ◽  
Vol 25 (3) ◽  
pp. 367-371 ◽  
Author(s):  
Tae-Won Kim ◽  
Tae-Kyu Lee ◽  
Bum-Soo Kim ◽  
Kwang-Soo Lee ◽  
In-Uk Song ◽  
...  
Keyword(s):  
Pilocytic Astrocytoma ◽  
Check Valve ◽  
Pineal Region ◽  
Valve Mechanism ◽  
Pineal Region Tumor

Check-valve Mechanism as a Cause of Bilateral Spontaneous Pneumothorax Complicating Bronchioloalveolar Cell Carcinoma

CHEST Journal ◽  
1991 ◽  
Vol 100 (3) ◽  
pp. 853-855 ◽  
Author(s):  
Hironobu Minami ◽  
Shuzo Sakai ◽  
Atsushi Watanabe ◽  
Kaoru Shimokata
Keyword(s):  
Cell Carcinoma ◽  
Spontaneous Pneumothorax ◽  
Check Valve ◽  
Valve Mechanism ◽  
Bronchioloalveolar Cell Carcinoma

Pulmonary Rhabdomyosarcoma Associated with Check-Valve Mechanism

2017 ◽  
Vol 196 (3) ◽  
pp. e7-e9
Author(s):  
Udit Chaddha ◽  
Jeffrey A. Hagen ◽  
Bassam Yaghmour
Keyword(s):  
Check Valve ◽  
Valve Mechanism

THE CHECK-VALVE MECHANISM AND THE MEANING OF EMPHYSEMA

The Lancet ◽  
1958 ◽  
Vol 271 (7013) ◽  
pp. 222
Author(s):  
G.C.R. Morris ◽  
J.G. Widdicombe
Keyword(s):  
Check Valve ◽  
Valve Mechanism

RADIOLOGIC AID IN REGIONAL AND GENERALIZED EMPHYSEMA OF THE LUNGS IN INFANTS

PEDIATRICS ◽  
1959 ◽  
Vol 24 (6) ◽  
pp. 1050-1064
Author(s):  
Edwin J. Liebner
Keyword(s):  
Pulmonary Infection ◽  
Main Bronchus ◽  
Check Valve ◽  
Valve Mechanism ◽  
Extrinsic Factors ◽  
Plain Films ◽  
Regional Basis ◽  
Roentgenographic Study ◽  
Lobar Emphysema ◽  
Pathologic Processes

Normally, the bronchi dilate rapidly in inspiration and contract slowly in expiration, thus effecting a form of check-valve mechanism. Intra-and extra-bronchial occlusion, pulmonary infection, developmental bronchopulmonary malformations and pleural communications are pathologic processes which can disturb the check-valve mechanism and produce increased aeration. [See Figure in Source Pdf.] The main bronchus and artery may be obstructed separately, or as a unit. Angiocardiograms should be analyzed for abnormal patterns, especially obstruction or atresia. A lack of vascular markings in the lungs can suggest pseudo-increased aeration. On a regional basis, roentgenographic study of the vascular and air patterns can lead to recognition of certain entities. An angiogram in congenital lobar emphysema contrasts the vascular pattern in the involved and the remaining normal and unaffected lobes with pneumatocele, cystic disease, and atelectasis. Reasons for support of the deficient-cartilage theory as a cause of lobar emphysema are cited, with emphasis on the localization of the emphysema to the anterior or upper lobes. Bronchiolitis can give total compensatory emphysema, and the reasons given will help to understand the roentgenographic findings. Regional compensatory emphysema of the remaining lung, after total or partial collapse of a lobe by intrinsic or extrinsic factors, is illustrated. Basal pneumothorax is indicated to be a significant postoperative complication. Although at times great similarity may exist in the appearance of plain films in conditions producing increased aeration of infants' lungs, it is hoped that this review will stimulate deeper analyses and wider recognition of the fundamentals.

THE CHECK-VALVE MECHANISM AND THE MEANING OF EMPHYSEMA

The Lancet ◽  
1958 ◽  
Vol 271 (7015) ◽  
pp. 317-318 ◽  
Author(s):  
W.A. Lister
Keyword(s):  
Check Valve ◽  
Valve Mechanism

scholarly journals Diagnosis and surgical strategy for sacral meningeal cysts with check-valve mechanism: technical note

2012 ◽  
Vol 155 (2) ◽  
pp. 309-313 ◽  
Author(s):  
Shunji Asamoto ◽  
Yasuyuki Fukui ◽  
Makoto Nishiyama ◽  
Masayuki Ishikawa ◽  
Nobuyuki Fujita ◽  
...  
Keyword(s):  
Check Valve ◽  
Technical Note ◽  
Surgical Strategy ◽  
Valve Mechanism ◽  
Meningeal Cysts

scholarly journals Pneumatocele after Acute Respiratory Distress Syndrome in an Adult Patient: A Case Report

2020 ◽  
Vol 3 (3) ◽  
pp. 73-78
Author(s):  
Gouthami Chennu ◽  
Paulina Przydzial ◽  
Yee Tchao ◽  
Anthony Isedeh ◽  
Nikhil Madan
Keyword(s):  
Acute Respiratory Distress Syndrome ◽  
Respiratory Distress Syndrome ◽  
Respiratory Distress ◽  
Positive Pressure Ventilation ◽  
Distress Syndrome ◽  
Specific Treatment ◽  
Check Valve ◽  
Lung Parenchyma ◽  
Positive Pressure ◽  
Valve Mechanism

Pulmonary pneumatocele is a cystic, air-filled lesion in the lung parenchyma. It results from underlying inflammation or bronchial injury. It is seen in several lung pathologies including bacterial pneumonia, positive-pressure ventilation, chest trauma, chemical pneumonitis, and is most often seen in infants and children. On imaging, pneumatoceles appear as rounded, thin-walled, air-filled spaces in the lung parenchyma. The exact mechanism for forming pneumatoceles is not fully understood but thought to be due to a check-valve mechanism due to obstruction by inflammation causing air trapping in the damaged lung. These lesions are asymptomatic and transient in most patients and disappear by about 6 weeks. They usually do not require any specific treatment or intervention. Surgical intervention is only necessary when pneumatoceles cause cardiopulmonary compromise or rupture into the pleural space. We describe a case of a young adult who developed a pneumatocele after developing acute respiratory distress syndrome from community-acquired pneumonia treated with positive-pressure ventilation. He was managed conservatively with complete resolution of symptoms.

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