Cell-Mediated Immunity to Pityrosporum Orbiculare in Tinea Versicolor

Pityrosporum orbiculare, the presumed etiologic agent of tinea versicolor, was cultured in vitro and antigenic extracts prepared from the cultured organisms. Studies with lymphocytes from human cord blood and peripheral blood of guinea pigs demonstrated that such extracts were not mitogenic. Further studies in guinea pigs indicated that the animals could be sensitized by the injection of P. orbiculare extract in Freund's complete adjuvant and that this extract could elicit lymphocyte transformation and delayed skin test responses in sensitized animals. A group of 12 tinea versicolor patients and 15 normal subjects were studied in vitro for cell-mediated immunity to P. orbiculare extract. The majority of the subjects tested in both groups demonstrated positive lymphocyte transformation responses to this extract, as well as to standard mitogens and common microbial antigens. However, lymphocytes from tinea versicolor patients produced significantly less leukocyte migration inhibitory factor activity when stimulated by Candida albicans and P. orbiculare extracts than did lymphocytes from normal subjects. This was also true if only subjects with positive lymphocyte transformation responses to these antigens were considered. Leukocyte migration inhibitory factor responses to streptokinase/streptodornase were not significantly different between the two groups. Therefore, it appears that although both normal subjects and tinea versicolor patients demonstrate prior sensitization to antigens of P. orbiculare, the effector function of lymphocytes from most tinea versicolor patients appears to be impaired in that they produce subnormal amounts of the mediator leukocyte migration inhibitory factor when stimulated with antigenic extracts of this organism.     

The need for rotational margins in intensity-modulated radiotherapy and a new method for planning target volume design

PURPOSE: The effect of rotational errors on the coverage of clinical target volumes (CTVs) is examined. A new planning target volume (PTV) construction that considers the individual paths traced by movements of the target boundary points is developed. METHODS AND MATERIALS: A standard uniform margin expansion was compared with a PTV constructed from the space swept out by a concave moving target. A new method formed the PTV by aggregating the separate convex hulls taken of the positions of the individual target boundary points in a sampling of CTV displacements. RESULTS: A 0.5-cm uniform margin adequate for translations was inadequate given CTV rotation about a fixed off-center axis. A PTV formed of the target's swept-out area was 22% smaller than needed for coverage by a uniform margin, but computationally is not readily extended to translations combined with rotations about a shifting axis. Forming instead the union of convex hulls of the boundary points in a sampling of CTV displacements represented these movements in the PTV design and retained the target's concave shape. CONCLUSIONS: Planning target volumes should accommodate target rotation. The union of convex hulls of the boundary point positions in a sampling of displacements can effectively represent multiple sources of deviations while preserving target concavities.     

Comparison of invasive and non-invasive treatment strategies in older patients with acute myocardial infarction complicated by cardiogenic shock (from the Polish Registry of Acute Coronary Syndromes - PL-ACS)

Cardiogenic shock (CS) continues to be the most important factor affecting the mortality rate of patients with acute myocardial infarctions (AMIs). However, controversy regarding the optimal treatment of older patients with AMIs complicated by CS still exists. The aim of this study was to compare the results of invasive (coronary angiography during index hospitalization) and noninvasive treatment strategies in patients aged ≥ 75 years with AMIs complicated by CS, defined as systolic blood pressure <90 mm Hg or need for hemodynamic support and end-organ hypoperfusion. A multicenter Polish registry that included data on patients with acute coronary syndromes was examined to identify patients with AMIs treated from October 2003 to May 2007. A total of 97,531 patients with AMIs were hospitalized, and 5.5% of those patients (n = 5,390) had CS on admission, including 1,976 patients aged ≥ 75 years (509 treated invasively and 1,467 treated noninvasively). In-hospital mortality was 55.4% in patients treated invasively and 69.9% in patients treated noninvasively (p <0.0001). After 6 months, the mortality rate was 65.8% in the invasive group and 80.5% in the noninvasive group (p <0.0001). Propensity score analysis, in which 499 patients of each group were analyzed after being matched for demographic and clinical data, confirmed the early and long-term benefits of the invasive strategy. In conclusion, applying the invasive strategy to patients with AMIs complicated by CS reduced in-hospital and 6-month mortality in patients aged ≥ 75 years.     

Impaired exercise-induced blood volume in type 2 diabetes with or without peripheral arterial disease measured by continuous-wave near-infrared spectroscopy

OBJECTIVE: Diabetes is a significant risk factor for peripheral arterial disease (PAD) and is associated with accelerated atherosclerosis and limb loss. However, the pathophysiology involved in PAD is unclear. This study was conducted to evaluate the hemodynamic response to exercise of patients with and without diabetes and PAD. RESEARCH DESIGN AND METHODS: The hemodynamic response in calf muscles of patients with diabetes, PAD, or both was determined using near-infrared spectroscopy (NIRS). Patients performed both a plantar-flexion and treadmill-walking exercise regimen. RESULTS: Skeletal muscle capillary blood volume expansion during exercise, as measured by NIRS, was significantly impaired in the lower extremities of diabetic patients with a normal ankle-brachial index. The relative deoxygenation and oxygenation recovery times measured by NIRS correlates significantly with the presence of PAD. CONCLUSIONS: Patients with diabetes have reduced capillary volume expansion even without PAD. This is likely due to impaired vasodilation secondary to endothelial dysfunction. Further studies are needed to determine whether pharmaceutical intervention improves the blood volume expansion in the diabetic state.     

Mycobacterium tuberculosis complex and mycobacterial heat shock proteins in lymph node tissue from patients with pulmonary sarcoidosis

We demonstrated that not whole Mycobacterium tuberculosis but its particular antigens, hsp70(Mtb), hsp65(Mtb), and hsp16(Mtb), are present in lymph node tissues of patients with sarcoidosis (SA). hsp16(Mtb) occurs in the early stage of SA, whereas hsp70(Mtb) occurs in stage II of SA. hsp65(Mtb) is highly expressed in the capillary vessels in lymph node tissues in patients with SA.