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Biomedical subjects

R Weintraub

Publications and source records attributed to R Weintraub.

25 records · Page 2Linked to original sources
PubMed1977

Multiple fibrofolliculomas (Birt-Hogg-Dubé) associated with a large connective tissue nevus.

Multiple follicular tumors of the type recently described by Birt and colleagues as fibrofolliculomas were observed in the dorsal skin of a white man in association with a large connective tissue nevus. No signs of systemic disease or phakomatosis were present. This type of lesions represents benign neoplasia of the fibrous root sheath of the hair follicle in association with proliferations of the infundibular portion of the outer epithelial root sheath. Its existence supports the view that the mesodermal portions of the pilar apparatus can become neoplastic, and also provides another example of the close interactions existing between the ectodermal and mesodermal components of the hair follicle.

Hair↗
PubMedDate not supplied

Color flow Doppler mapping studies of "physiologic" pulmonary and tricuspid regurgitation: evidence for true regurgitation as opposed to a valve closing volume.

Color flow Doppler mapping using either an Aloka 880 or a Toshiba SSH65A system was performed in 39 normal subjects (aged 13 to 45 years) and 43 patients (aged 13 to 82 years) with pathologic tricuspid or pulmonary regurgitation to evaluate the incidence of "physiologic" regurgitation of right heart valves and to determine the differentiating characteristics in the spatial distribution and velocity encoding of "normal" and "pathologic" regurgitant jets. In the normal subjects, tricuspid and pulmonary regurgitation were documented in 32 (83%) and 36 (93%), respectively, and were unrelated to the system being used. Flow acceleration and aliasing were imaged on the right ventricular side of the tricuspid regurgitant orifice and on the pulmonary artery side of the pulmonary valve (in both normal subjects and patients), and indicated flow convergence for true regurgitation through an orifice as opposed to blood being driven retrogradely by the closing valve. Such proximal acceleration was documented in all patients with pathologic tricuspid regurgitation, in 31/32 of the normal subjects with tricuspid regurgitation, and was also observed in 12/15 (80%) of the patients and 4/12 (33%) of normal subjects with pulmonary regurgitation who were examined with the Toshiba system. The dimensions (mean +/- SD) of tricuspid regurgitant jets (length [JL] and area [JA]) were consistently larger in the patients than in the normal subjects [JL: 3.4 +/- 0.9 vs 1.2 +/- 0.5 cm, p less than 0.001; and JA: 5.7 +/- 2.0 vs 1.4 +/- 0.7 cm2, p less than 0.001) as were the pulmonary regurgitation jet dimensions (JL: 1.8 +/- 0.4 vs 0.9 +/- 0.08 cm, p less than 0.001; JA: 1.8 +/- 0.7 vs 0.3 +/- 0.08 cm2, p less than 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMedDate not supplied

Mediastinitis after cardiovascular surgery.

Postoperative mediastinitis complicated 21 (3.4%) of 616 median sternotomy procedures at Beth Israel Hospital (Boston, Mass.) between 1975 and 1979. These cases were analyzed by means of a case control study to identify host and operative risk factors and to characterize the clinical features of mediastinitis. Eighteen patients with mediastinitis (86%) had serious underlying noncardiac diseases, as compared with 14 (33%) of 42 noninfected controls (P = .001). Reoperation was positively associated with infection (P = .03). All patients had abnormal sternal wounds and fever; sternal instability and mediastinal widening were unusual. Twelve patients (57%) were bacteremic. Twenty-four organisms were recovered from the 21 patients with mediastinitis; 13 of the isolates were gram-positive, and 11 were gram-negative. Infections due to gram-negative bacteria appeared earlier and were more likely to be bacteremic (70%). All gram-negative isolates and five of six isolates of Staphylococcus epidermidis were resistant to the antimicrobial agent used perioperatively. Patients were treated with extensive debridement and appropriate antibiotics. The mortality rate was 24% (five of 21). Long-term complications in survivors were not seen.

Cardiac Surgical Procedures↗