A Fatal Case of Septic Shock Secondary to Acinetobacter Bacteremia Acquired from a Platelet Transfusion.

BACKGROUND: Transfusion of blood products is a frequent and often necessary lifesaving intervention. While changes to blood bank practices over the past several decades have reduced the infectious complications associated with transfusions, risks still exist. Septic transfusion reactions caused by bacterial contamination of blood products, especially platelets, still occur relatively frequently. Unfortunately, clinical recognition of septic transfusion reactions is difficult due to significant symptom, exam, and laboratory abnormality overlap between different types of transfusion reactions, as well as other conditions. Novel methods have been developed to detect blood product contamination but have yet to be widely implemented in the United States. CASE REPORT: A 67-year-old male with chronic thrombocytopenia was transfused with platelets prior to a planned procedure. Shortly afterwards, he developed fever and hypotension. He was transferred to the intensive care unit where he was treated with aggressive fluid resuscitation and broad-spectrum antibiotics. The patient went on to develop progressively worsening shock and profound disseminated intravascular coagulation. Blood cultures from the patient and the transfused platelets grew an Acinetobacter species. Despite aggressive resuscitative efforts and appropriate antibiotics, the patient died approximately 48 hours following the transfusion reaction. CONCLUSION: We report a fatal case of septic shock associated with Acinetobacter bacteremia caused by platelet transfusion. Our review of the literature revealed only one other documented platelet transfusion associated fatality caused by Acinetobacter species. Novel pathogen reduction and contamination detection methods have been developed but have yet to be widely adopted in the United States.

Longwave-IR optical parametric oscillator in orientation-patterned GaAs pumped by a 2 µm Tm,Ho:YLF laser.

We demonstrate longwave infrared (LWIR) generation with an optical parametric oscillator (OPO) based on quasi-phasematched orientation-patterned gallium arsenide (OPGaAs). The OPGaAs OPO was directly pumped with a Q-switched λ = 2.054 µm Tm,Ho:YLF laser. OPGaAs samples representing three different grating periods were used to explore the LWIR OPO performance yielding outputs ranging from λ = 2.5-2.7 µm (signal) and λ = 8.8-11.5 µm (idler). Slope efficiencies for the combined signal and idler outputs reach as high as 26% while slope efficiencies for only the idler reached 8%. Spectral measurements of OPO output confirm good agreement with theoretical calculations.

Co-sputtered SiC + Ag nanomixtures as visible wavelength negative index metamaterials.

The fabrication and characterization of a novel metamaterial that shows negative index in the visible (blue) is reported. The real part of the negative index of this metamaterial at 405 nm, comprising co-sputtered SiC + Ag nanoparticle mixture on a glass substrate, is deduced from results of double Michelson interferometry setup which shows a negative phase delay. It is numerically verified that this metamaterial can yield near-field super-resolution imaging for both TE and TM polarizations.

Terahertz generation with tandem seeded optical parametric generators.

A simple difference frequency generation (DFG) scheme based on two seeded optical parametric generators is presented as a tunable terahertz (THz) source. Using the nonlinear optical crystal 4-dimethylamino-N-methyl-4-stilbazolium-tosylate (DAST) as the DFG crystal, our system has demonstrated continuous and seamless tunable operation from 1.6 to 4.5 THz. The output bandwidth of the THz source is 2.4 GHz. The utility of the source over this spectral range is demonstrated by measuring a high-resolution transmission spectrum of water vapor in air.

Nurses' clinical decision-making regarding the management of pain.

Effective pain management remains an elusive goal within the profession of nursing. While considerable improvement has occurred, patients continue to experience inappropriate levels of pain. To date, research has focused on objective factors that influence pain management. Few studies have examined attitudinal factors that may influence nurses' decision-making. This quasi-experiment was based on preliminary data showing that nurses' preconceived notions regarding certain patient groups influenced their management of pain. An intervention was tested for its' effect on nurses' preconceived notions regarding specific patient groups. A significant difference in a positive direction was found. Nurses were more willing to spend time and energy managing pain across all patient groups following the intervention.

Nurses' clinical decision-making regarding the management of pain.

Effective pain management remains an elusive goal within the profession of nursing. While considerable improvement has occurred, patients continue to experience inappropriate levels of pain. To date, research has focused on objective factors that influence pain management. Few studies have examined attitudinal factors that may influence nurses' decision-making. This quasi-experiment was based on preliminary data showing that nurses' preconceived notions regarding certain patient groups influenced their management of pain. An intervention was tested for its' effect on nurses' preconceived notions regarding specific patient groups. A significant difference in a positive direction was found. Nurses were more willing to spend time and energy managing pain across all patient groups following the intervention.

Nitrotyrosine, inducible nitric oxide synthase (iNOS), and endothelial nitric oxide synthase (eNOS) are increased in thyroid tumors from children and adolescents.

Nitric oxide (NO) is a reactive cell signal that controls vascular tone and is generated by inducible (iNOS), endothelial (eNOS) and neuronal (nNOS) NO synthase (NOS). We hypothesized that NO could be important for growth of thyroid tumors and tested this hypothesis, by staining 41 papillary thyroid carcinoma (PTC), 9 follicular thyroid carcinoma (FTC), and 15 benign thyroid lesions for iNOS, eNOS and nitrotyrosine (N-TYR). Staining intensity was determined by 2 blinded, independent examiners, and quantified from grade 1 (absent) to grade 4 (intense). Average N-TYR staining of benign adenomas (2.5+/-0.42, p=0.009), PTC (3.10+/-0.12, p=0.001), FTC (2.44+/-0.30, p=0.001), and autoimmune lesions (3.25+/-0.48, p=0.019) were greater than that of multinodular goiter (1.0 for all 3) and surrounding normal thyroid (1.1+/-0.1). Average iNOS staining of benign adenomas (2.6+/-0.37), PTC (2.7+/-0.16), FTC (2.4+/-0.26) and autoimmune lesions (3.5+/-0.29) were all greater than that of surrounding normal thyroid (1.1+/-0.1, p<0.008), but there were too few multinodular goiters to achieve a significant difference (no.=2, 3.0+/-1.0). Average eNOS staining of benign adenomas (2.9+/-0.40), multinodular goiters (3.5+/-0.5), PTC (3.24+/-0.18), FTC (3.5+/-0.50), and autoimmune lesions (2.8+/-0.6) were also greater than that of surrounding normal thyroid (mean=1.4+/-0.2, p<0.001). N-TYR staining correlated with that of vascular endothelial growth factor (VEGF, r=0.36, p=0.007) and the number of lymphocytes/high power field (r=0.39, p=0.004). Recurrent disease developed only from carcinoma with moderate-intense N-TYR staining, but there were too few recurrent tumors to achieve statistical significance (p=0.08). We conclude that NO is produced by benign adenomas, PTC and FTC suggesting that NO could be important in vascularization of thyroid tumors and autoimmune thyroid diseases.

Community case management for frail, elderly clients: the nurse case manager's role.

Capitated payment systems have forced healthcare providers to explore new methods of care delivery for frail, older clients who consume a disproportionate amount of time and resources. The authors describe the experiences of frail elders in a community case management program within a managed care setting. The experiences of living with frailty in a changing healthcare system, and perceptions of the case manager's ability to help navigate that system, are described. This article presents the benefits of community case management toward client goals of safety, support, and control.

Expanding health insurance coverage for smoking cessation treatments: experience of the Pacific Business Group on Health.

The business case for health insurance coverage of smoking cessation treatments by employers is a strong one. Smoking is one of the nation's costliest health problems, in both human and financial terms. The science behind smoking cessation treatment and promotion of treatment is strong; the cost effectiveness of smoking cessation treatment is among the highest in all of medicine, the time required before a positive return on investment is reasonable for employers, and the short-term costs of treatments are well estimated and manageable for health plans and employers. Armed with this business case, the PBGH Negotiating Alliance has expanded health insurance to include pharmacotherapy, over the counter or by prescription, and behavioral interventions. Because PBGH has been a national leader, we hope that other employers, employer coalitions, and public purchasers will follow their lead. The potential health effect of even small reductions in smoking are striking, and unlike other chronic illnesses, nicotine addiction is curable, at both individual and societal levels. Thus, if employers make the investment in smoking cessation and other tobacco control today, they face the real possibility that the need for such outlays could decrease in the future.

Modulation of L-type Ca2+ current but not activation of Ca2+ release by the gamma1 subunit of the dihydropyridine receptor of skeletal muscle.

BACKGROUND: The multisubunit (alpha1S,alpha2-delta, beta1a and gamma1) skeletal muscle dihydropyridine receptor (DHPR) transduces membrane depolarization into release of Ca2+ from the sarcoplasmic reticulum (SR) and also acts as an L-type Ca2+ channel. To more fully investigate the function of the gamma1 subunit in these two processes, we produced mice lacking this subunit by gene targeting. RESULTS: Mice lacking the DHPR gamma1 subunit (gamma1 null) survive to adulthood, are fertile and have no obvious gross phenotypic abnormalities. The gamma1 subunit is expressed at approximately half the normal level in heterozygous mice (gamma1 het). The density of the L-type Ca2+ current in gamma1 null and gamma1 het myotubes was higher than in controls. Inactivation of the Ca2+ current produced by a long depolarization was slower and incomplete in gamma1 null and gamma1 het myotubes, and was shifted to a more positive potential than in controls. However, the half-activation potential of intramembrane charge movements was not shifted, and the maximum density of the total charge was unchanged. Also, no shift was observed in the voltage-dependence of Ca2+ transients. gamma1 null and gamma1 het myotubes had the same peak Ca2+ amplitude vs. voltage relationship as control myotubes. CONCLUSIONS: The L-type Ca2+ channel function, but not the SR Ca2+ release triggering function of the skeletal muscle dihydropyridine receptor, is modulated by the gamma1 subunit.

Adolescents with cystic fibrosis: family reports of adolescent health-related quality of life and forced expiratory volume in one second.

PURPOSE: To assess the relationship between adolescent and parent reports of adolescent health-related quality of life (HRQL) and between adolescent pulmonary function (forced expiratory volume in 1 second as percent of predicted) and reporter perceptions of adolescent health. METHODS: Twenty-four adolescents with cystic fibrosis (CF), their mothers, and their fathers completed the Child Health Questionnaire during routine CF clinic visits at 2 urban hospitals. Patients were between the ages of 11 and 18 years (mean age: 14.2 years) and were predominantly male (75%). The best measure of forced expiratory volume in 1 second as percent of predicted for the year of the study was also collected for each adolescent. RESULTS: Adolescent pulmonary function was related to the perceived adolescent physical health scales. It was not, however, associated to perceptions of adolescent emotional, social, or behavioral HRQL by any of the 3 family reporters. Associations were found between adolescent pulmonary function and self-reports of general health (0.73), role/social limitations-physical (0.47), and bodily pain (0.42). Adolescent pulmonary function was related to mother reports of adolescent general health (0.73), role/social limitations-physical (0.73), bodily pain (0.55), and physical functioning (0.70). Father perceptions of adolescent health were associated to adolescent pulmonary function on general health (0.54), role/social limitations-physical (0.60), and physical functioning (0.64). Associations between adolescent and parent perceptions of adolescent HRQL were also health scale-specific. Mother and child reports of adolescent HRQL were related on adolescent behavior problems (0.71) and role/social limitations attributable to behavior (0.48), role/social limitations attributable to physical (0.62), bodily pain (0.69), physical functioning (0.69), family activities (0.45), and general health (0.66). Associations were found between father and adolescent reports on perceived adolescent behavior problems (0.66); self-esteem (0.65); and role/social limitations attributable to physical (0.49), general health (0.61), and perceived mental health (0.48). CONCLUSIONS: Results demonstrate the need to include multiple informants and comprehensive, multidimensional measures of HRQL, in addition to pulmonary function, when assessing health in adolescents with CF.

Intramembrane charge movements and excitation- contraction coupling expressed by two-domain fragments of the Ca2+ channel.

To investigate the molecular basis of the voltage sensor that triggers excitation-contraction (EC) coupling, the four-domain pore subunit of the dihydropyridine receptor (DHPR) was cut in the cytoplasmic linker between domains II and III. cDNAs for the I-II domain (alpha1S 1-670) and the III-IV domain (alpha1S 701-1873) were expressed in dysgenic alpha1S-null myotubes. Coexpression of the two fragments resulted in complete recovery of DHPR intramembrane charge movement and voltage-evoked Ca(2+) transients. When fragments were expressed separately, EC coupling was not recovered. However, charge movement was detected in the I-II domain expressed alone. Compared with I-II and III-IV together, the charge movement in the I-II domain accounted for about half of the total charge (Q(max) = 3 +/- 0.23 vs. 5.4 +/- 0.76 fC/pF, respectively), and the half-activation potential for charge movement was significantly more negative (V(1/2) = 0.2 +/- 3.5 vs. 22 +/- 3.4 mV, respectively). Thus, interactions between the four internal domains of the pore subunit in the assembled DHPR profoundly affect the voltage dependence of intramembrane charge movement. We also tested a two-domain I-II construct of the neuronal alpha1A Ca(2+) channel. The neuronal I-II domain recovered charge movements like those of the skeletal I-II domain but could not assist the skeletal III-IV domain in the recovery of EC coupling. The results demonstrate that a functional voltage sensor capable of triggering EC coupling in skeletal myotubes can be recovered by the expression of complementary fragments of the DHPR pore subunit. Furthermore, the intrinsic voltage-sensing properties of the alpha1A I-II domain suggest that this hemi-Ca(2+) channel could be relevant to neuronal function.

Hyperpolarized 3He MR lung ventilation imaging in asthmatics: preliminary findings.

Asthma is a disease characterized by chronic inflammation and reversible obstruction of the small airways resulting in impaired pulmonary ventilation. Hyperpolarized 3He magnetic resonance (MR) lung imaging is a new technology that provides a detailed image of lung ventilation. Hyperpolarized 3He lung imaging was performed in 10 asthmatics and 10 healthy subjects. Seven asthmatics had ventilation defects distributed throughout the lungs compared with none of the normal subjects. These ventilation defects were more numerous and larger in the two symptomatic asthmatics who had abnormal spirometry. Ventilation defects studied over time demonstrated no change in appearance over 30-60 minutes. One asthmatic subject was studied twice in a three-week period and had ventilation defects which resolved and appeared in that time. This same subject was studied before and after bronchodilator therapy, and all ventilation defects resolved after therapy. Hyperpolarized 3He lung imaging can detect the small, reversible ventilation defects that characterize asthma. The ability to visualize lung ventilation offers a direct method of assessing asthmatics and their response to therapy.

Establishing guidelines for pharmacotherapy trials in bulimia nervosa and anorexia nervosa.

OBJECTIVE: This paper addresses the lack of a standard protocol for pharmacotherapy trials for patients with bulimia nervosa (BN) and anorexia nervosa (AN). METHOD: Twenty-two surveys were sent to established researchers in the field of eating disorders to elicit their opinions regarding medication trials, including baseline laboratory tests, the optimal length/frequency of medication management sessions, and the information that should or should not be included in these sessions. RESULTS: Sixteen of 22 researchers completed and returned the survey. Their answers are the basis of the data presented. DISCUSSION: We propose a battery of screening laboratory tests for both conditions. We suggest 30-45-min initial medication management sessions in both AN and BN trials with 15-min follow-ups to be held weekly for AN subjects, and weekly for 2 weeks, then biweekly for 2 weeks, then monthly, for BN subjects. We also recommend that published trials should include explicit details of medication management.

Psychiatric status, prevention, and outcome in patients with burns: a prospective study.

One hundred consecutive patients admitted to the Tampa Bay Regional Burn Center were assessed to determine cause of injury, preburn psychiatric status, and outcome (survival, length of stay in the hospital, and emergence of new psychiatric or physiologic disorders). Patients with psychiatric disorders were more likely to have injuries that were preventable, and there was a trend for this group to have more emergent psychiatric disorders and longer lengths of hospital stay. We suggest that the Burn Severity Index might be revised to include the presence of preburn psychiatric disorders and then be evaluated in a larger group with use of the Burn Registry.

A case of tuberculosis in Memphis.

The resurgence of tuberculosis has been of increasing concern to public health. Laryngeal and cutaneous tuberculosis have long been regarded as two of the most infectious forms of the disease. In this article, we re-emphasize the public health consequences of a case of laryngeal TB, which must be considered in the differential diagnosis of a patient with persistent fever, cough, weight loss, and hoarseness.