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Biomedical subjects

J McMahon

Publications and source records attributed to J McMahon.

102 records · Page 6Linked to original sources
PubMedDate not supplied

Radiographically determined lung volumes at full inspiration and during dynamic forced expiration in normal subjects.

Posteroanterior and lateral radiographs of the lungs of 30 normal adults were obtained at total lung capacity (TLC) and 1 sec after initiation of forced expiration from ttlc. simultaneous spirographic recording of the volume expired (FEV-1) and independent plethysmographic recording of TLC were obtained. Two types of measurements were made from the radiographs: 1) surface areas of the lung fields, measured planimetrically; and 2) combinations of linear distances between selected points. These radiographic measurements and the measured lung volumes were subjected to computer analysis to develop reliable formulas for determining lung volumes solely from radiographs. Formulas derived using planimetry produced multiple correlation coefficients of 0.95 for TLC and 0.89 for volume during forced expiration. Use of linear measurements produced multiple correlation coefficients of 0.92 for TLC and 0.84 for dynamic volume. Thus, in normal subjects, static lung volumes and lung volumes during dynamic forced expiration can be determined from radiographs.

Adult↗
PubMedDate not supplied

Pulmonary artery dissection and rupture in Eisenmenger's syndrome.

A patient with ventricular septal defect and pulmonary arterial hypertension (Eisenmenger's syndrome) associated with aortic coarctation with follow-up for 19 years, and with rupture of an aneurysmatic pulmonary artery is described. An incident of extreme fright with a possible transient systemic hypertension may have precipitated the dissection of the pulmonary arterial intima and the rupture.

Adolescent↗
PubMedDate not supplied

HCV screening.

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Hepatitis C↗
PubMedDate not supplied

Corneal microsporidioses: characterization and identification.

Two ocular infectious disorders attributed to Microsporidia have been observed. They differ in that one infection involves the corneal stroma leading to corneal ulceration and suppurative keratitis whereas the other infection involves the conjunctival and corneal epithelium. The corneal stromal infection is caused by a binucleated oval spore that is Nosema-like in character. The conjunctival and corneal epithelial infection occurs in HIV-sero-positive individuals and is caused by a spore containing a single nucleus that is a member of the genus Encephalitozoon. Characteristics of these genera and the above-mentioned infections are presented.

Adult↗