Extending the search for neutrino point sources with IceCube above the horizon

Point source searches with the IceCube neutrino telescope have been restricted to one hemisphere, due to the exclusive selection of upward going events as a way of rejecting the atmospheric muon background. We show that the region above the horizon can be included by suppressing the background through energy-sensitive cuts. This improves the sensitivity above PeV energies, previously not accessible for declinations of more than a few degrees below the horizon due to the absorption of neutrinos in Earth. We present results based on data collected with 22 strings of IceCube, extending its field of view and energy reach for point source searches. No significant excess above the atmospheric background is observed in a sky scan and in tests of source candidates. Upper limits are reported, which for the first time cover point sources in the southern sky up to EeV energies.

The influence of organizational structure on physician satisfaction: findings from a national survey

BACKGROUND

The term managed care encompasses a variety of organizational arrangements between physicians and health plans. At one extreme, physicians are plan employees; at the other, physicians have contracts with multiple plans. How these arrangements affect physicians' satisfaction with managed care is not well known.

OBJECTIVE

To explore the effect of organizational structure on physician satisfaction.

DESIGN

Telephone survey of 751 practicing internists. The response rate for the 15-minute survey was 64%. SAMPLING STRATEGY: The random sample was taken from the membership of the American College of Physicians-American Society of Internal Medicine. Federal employees, retirees, physicians, and students who spent less than half of their time in patient care were excluded.

RESULTS

689 Physicians indicated that they were affiliated with a managed care plan: 9% were salaried employees, 6% had an exclusive contract with one plan, and 85% had a variety of nonexclusive arrangements with multiple plans. Among plan employees, 32% reported they were very satisfied with the managed care organization in which they worked. The corresponding figure was 19% among physicians with an exclusive contract and 5% among those with multiple contracts. A similar pattern of responses was seen when physicians were asked about their perception of the commitment of managed care to quality. Although 64% of plan employees responded that there was a great deal of commitment, the corresponding figure was 35% among physicians with an exclusive contract and only 7% among those with multiple contracts.

CONCLUSIONS

Physicians who are salaried employees of a staff- or group-model HMO report the highest satisfaction with managed care.

Teaching skills improvement programmes in US internal medicine residencies

The prevalence and nature of resident teaching skills improvement programmes (TSIP) are unknown. Although residents perceive themselves as important teachers of students, there is little information on how programme directors (PDs) view residents as teachers. A comprehensive questionnaire was sent to all 428 US internal medicine PDs in December 1990, of which 60% (n = 259) responded. Of the 259 responding programmes, only 20% (n = 51) had TSIPs. Characteristics of TSIPs were not uniform. Mean instructional time was 9 hours (range, 1-24 hours). The teacher most frequently utilized to develop and facilitate the TSIP was the PD. PDs from residencies with a TSIP indicated more strongly than PDs without a TSIP that residents contributed to students' learning. Fifty-one per cent of TSIPs required residents to attend. Evaluation/feedback as a teaching method was the most common topic covered in TSIPs. Long-term assessment of teaching skills after programme participation was done in 15% of TSIPs. Although PDs value the resident's role as teacher, current TSIPs in internal medicine residencies are few in number and lack standardization. PDs' attitudes probably influence whether residents are taught teaching skills and whether teaching skills are evaluated. Further investigation of appropriate curriculum for TSIPs and assessment of long-term effectiveness of TSIPs are needed.

Gastric myoelectric activity after experimental gastric dilatation-volvulus and tube gastrostomy in dogs

Gastric myoelectric activity was measured after experimental gastric dilatation-volvulus (GDV), GDV and tube gastrostomy, or tube gastrostomy in 12 dogs. Gastric myoelectric activity was recorded for 1 hour before (hour 0) and at hours 5, 24, 48, 72, and 96 after surgically induced GDV in six dogs. Three dogs with induced GDV and tube gastrostomy, and three dogs with tube gastrostomy only were also studied at hours 120, 144, and 168. The only significant change in the slow wave appearance or frequency from hours 0 to 48 was bradygastria at hour 5 in all three groups. A relative increase in the mean percentages of dysrhythmia from hours 72 to 168 in the dogs with a tube gastrostomy was caused by increases in tachygastria and arrhythmias. Dogs with GDV and tube gastrostomy had the greatest mean percentages of dysrhythmia, which were significantly more than those in dogs with GDV alone at hours 48, 72 and 96. The mean percentage of spike activity was less than or equal to 31 and varied widely. In general, there was less spike activity when the frequency of dysrhythmias was high. Thus, gastric myoelectric activity was disrupted from hours 48 to 168 after GDV with tube gastrostomy and after tube gastrostomy alone. Surgically induced GDV alone did not produce any significant or sustained dysrhythmias.

The effect of Swan-Ganz catheter height on the wedge pressure-left atrial pressure relationships in edema during positive-pressure ventilation

We have studied the effect of the ventrical height of the pulmonary wedge catheter in the lung on the pulmonary wedge pressure-left atrial relationship during positive end-expiratory pressure ventilation in oleic acid-induced pulmonary edema. Pulmonary wedge catheters were placed above and below the left atrium in normal dogs and in dogs with oleic acid-induced edema. Wedge pressure and left atrial pressure were measured simultaneously during positive end-expiratory pressure ventilation (range, 0 to 30 cm H2O positive end-expiratory pressure). Pulmonary wedge catheters below the left atrium correctly recorded left atrial pressure and change in left atrial pressure at all positive end-expiratory pressures studied. Pulmonary wedge catheters above the atrium consistently recorded pressures higher than the normal left atrial pressure. They did not correctly respond to increases in left atrial pressure until it was increased to a value higher than the initial upper pulmonary wedge pressure. Pulmonary arterial catheters, when properly placed, should be reliable indicators of left atrial pressure during positive-pressure ventilation in normal and edematous lungs.