Patient reactions to cancelled or postponed heart operations

OBJECTIVES: The aim was to survey the rate and cause of cancellations of planned cardiac operations at a Swedish clinic during 1999, and to study how the patients were affected. DESIGN: Questionnaires were distributed to 74 patients who had their operations cancelled. Their mood after discharge was measured with The Hospital Anxiety and Depression scale. Ninety-three patients, who were operated on without postponement, served as controls. RESULTS: Sixty-one percent of the patients in the cancellation group reacted negatively, especially if the reason for cancellation was organizational (P = 0.03). The women in the cancellation group had a significantly higher degree of depression than men (P = 0.01) and both women (P = 0.02) and men (P = 0.003) in the control group. Most of the patients, however, were satisfied with the nursing staff's reception and information. CONCLUSIONS: The patients reacted negatively to the cancellation, especially if it had organizational reasons. Women subjected to cancellation had a significantly higher degree of depression than other patients. To be avoided, organizational and medical problems must be identified in time. One way to do this is to introduce a preadmission nurse clinic.     

Can trial sequential monitoring boundaries reduce spurious inferences from meta-analyses?

BACKGROUND: Results from apparently conclusive meta-analyses may be false. A limited number of events from a few small trials and the associated random error may be under-recognized sources of spurious findings. The information size (IS, i.e. number of participants) required for a reliable and conclusive meta-analysis should be no less rigorous than the sample size of a single, optimally powered randomized clinical trial. If a meta-analysis is conducted before a sufficient IS is reached, it should be evaluated in a manner that accounts for the increased risk that the result might represent a chance finding (i.e. applying trial sequential monitoring boundaries). METHODS: We analysed 33 meta-analyses with a sufficient IS to detect a treatment effect of 15% relative risk reduction (RRR). We successively monitored the results of the meta-analyses by generating interim cumulative meta-analyses after each included trial and evaluated their results using a conventional statistical criterion (alpha = 0.05) and two-sided Lan-DeMets monitoring boundaries. We examined the proportion of false positive results and important inaccuracies in estimates of treatment effects that resulted from the two approaches. RESULTS: Using the random-effects model and final data, 12 of the meta-analyses yielded P > alpha = 0.05, and 21 yielded P alpha = 0.05. The monitoring boundaries eliminated all false positives. Important inaccuracies in estimates were observed in 6 out of 21 meta-analyses using the conventional P 相似文献   

The effect of stimulus interval on the auditory evoked response during sleep in autistic children

The averaged auditory evoked response to pairs of clicks separated by a 500 msec intrapair interval was measured in 10 autistic children, 8 boys and 2 girls, during Stage 2 and REM sleep. The long interval between paired clicks varied from 2 to 6.5 sec. Lengthening the interpair interval significantly increased amplitudes of responses to both clicks of each pair during Stage 2 and to the first during REM. With no effect during Stage 2, it significantly increased the response latency to the second click during REM. Such lengthening did not affect the amplitude recovery ratio during Stage 2 or REM, nor the latency recovery ratio in Stage 2, while increasing the latter during REM. It induced a significantly greater increase in latency ratio in autistic than age-matched normal children during REM. However, no difference was noted in recovery ratio between autistic and normal children at either interpair stimulus interval.This study was supported by USPHS Grants MH-13517, NB-02808, and The Scottish Rite Schizophrenia Research Program. Computing assistance was obtained from the Health Sciences Computing Facility, UCLA, sponsored by NIH special research resources grant RR-3. Miss Anne Mason, Mrs. Amy Mo, Miss Cynthia Kent, and Mr. James Ghahremani provided skilled technical assistance.     

From hope and expectation to unexpected death after cardiac surgery

OBJECTIVE: Relatives of patients undergoing cardiac surgery expect successful outcome but sometimes complications cause death. The aim was to interview relatives of patients who have died in connection with cardiac surgery and describe their experiences of information, reception and care. METHODS: Data were obtained from semi-structured interviews with 18 relatives of deceased patients and then analysed using qualitative content analysis. RESULTS: Two main groups emerged: "Analysing the situation" with the sub-groups: knowledge of cardiac disease, the road to operation, hope and despair, information and choice and "The thin thread of life" with the sub-groups, reception, life is over, care, death as a relief, cause of death and support. CONCLUSION: Most relatives were satisfied with the information and care in connection with the operation and at the end of life. However, some aspects such as inadequate pain control and transportation of critically ill patients to other wards and hospitals could be improved. One way is to introduce a co-ordinator in order to better support patients, next of kin and colleagues without experience of cardio-thoracic surgery who need help during the patients' way from diagnosis and acceptance of cardiac surgery and through the treatment and postoperative care.     

Clinical course of nonvisceral soft tissue leiomyosarcoma in 225 patients from the Scandinavian Sarcoma Group

BACKGROUND: Leiomyosarcoma of nonvisceral soft tissues is an uncommon malignant tumor; thus, only small numbers of cases have been reported. This study was based on a large series of patients from the Scandinavian Sarcoma Group Register acquired during a 15-year period (from 1986 to 2001). Follow-up information was available for all patients. METHODS: The authors analyzed the clinical features of 225 patients with cutaneous, subcutaneous, or deep-seated leiomyosarcoma of the extremities, trunk wall, and superficial parts of the head and neck region to determine the natural course of the disease. Only patients who received their treatment at a specialist sarcoma center were included. Re-evaluation of histopathology was performed. RESULTS: The age of the patients (121 women and 104 men) ranged from 20 years to 98 years (median, 70 years), and the tumors ranged in size from 0.6 cm to 35 cm (median, 4.0 cm). Eighty-two percent of the tumors were classified as high grade. The median follow-up for survivors was 5.5 years. The local treatment was adequate in 154 of 206 patients (75%) who were without metastasis at presentation. At 10 years, 84% of the 206 patients with localized disease at presentation were free from local recurrence, 66% remained metastasis free, and 49% were alive. Multivariate analysis showed that higher malignancy grade (P = .006), larger tumor size (P = .003), and deeper tumor location (P = .002) were correlated significantly with decreased metastasis-free survival, inadequate local treatment was correlated with local recurrence (P = .007), and high malignancy grade was correlated with decreased overall survival (P = .007). CONCLUSIONS: The long-term prognosis for patients with subcutaneous and deep-seated soft tissue leiomyosarcoma remains poor despite the ability to achieve adequate local control through nonmutilating surgery with or without radiotherapy.     

Regional Gas Exchange and Cellular Metabolic Activity in Ventilator-induced Lung Injury

Background: Alveolar overdistension and repetitive derecruitment-recruitment contribute to ventilator-induced lung injury (VILI). The authors investigated (1) whether inflammatory cell activation due to VILI was assessable by positron emission tomography and (2) whether cell activation due to dynamic overdistension alone was detectable when other manifestations of VILI were not yet evident.

Methods: The authors assessed cellular metabolic activity with [18F]fluorodeoxyglucose and regional gas exchange with [13N]nitrogen. In 12 sheep, the left ("test") lung was overdistended with end-inspiratory pressure of 50 cm H2O for 90 min, while end-expiratory derecruitment of this lung was either promoted with end-expiratory pressure of -10 cm H2O in 6 of these sheep (negative end-expiratory pressure [NEEP] group) or prevented with +10 cm H2O in the other 6 (positive end-expiratory pressure [PEEP] group) to isolate the effect of overdistension. The right ("control") lung was protected from VILI.

Results: Aeration decreased and shunt fraction increased in the test lung of the NEEP group. [18F]fluorodeoxyglucose uptake of this lung was higher than that of the control lung and of the test lung of the PEEP group, and correlated with neutrophil count. When normalized by tissue fraction to account for increased aeration of the test lung in the PEEP group, [18F]fluorodeoxyglucose uptake was elevated also in this group, despite the fact that gas exchange had not yet deteriorated after 90 min of overdistension alone.     

Measuring wearing time of knee-ankle-foot orthoses in children with cerebral palsy: comparison of parent-report and objective measurement

Purpose state: Orthotic wearing time may be an important confounder in efficacy studies of treatment in children with spastic cerebral palsy (SCP). Most studies measure parent-reported wearing time (WT_parent) with questionnaires, but it is questionable whether this yields valid results. This study aims to compare WT_parent with objectively measured wearing time (WT_obj) in children with SCP receiving orthotic treatment.

Method: Eight children with SCP participated in this observational study. For one year, they received knee-ankle-foot orthosis (KAFO) treatment. WT_parent was measured using questionnaires. WT_obj was measured using temperature sensor-data-loggers that were attached to the KAFOs. The 2.5th and 97.5th percentiles and median of differences between methods (per participant) were used to calculate limits of agreement and systematic differences.

Results: There was no systematic difference between WT_parent and WT_obj (0.1?h per week), but high inter-individual variation of the difference was found, as reflected by large limits of agreement (lower limit/2.5th percentile: ?1.7?h/week; upper limit/97.5th percentile: 11.1?h/week).

Conclusions: Parent-reported wearing time (WTparent) of a KAFO differs largely from objectively measured wearing time (WT_obj) using temperature sensors. Therefore, parent-reported wearing time (WT_parent) of KAFOs should be interpreted with utmost care.

• Implications for Rehabilitation

• Low wearing time of orthoses may be a cause of inefficacy of orthotic treatment and incorrect reported wearing time may bias results of efficacy studies.

• Results of this study show that parent-reported wearing time is not in agreement with objectively measured wearing time.

• Parent-reported wearing time of KAFOs should be interpreted with utmost care.

• Objective methods are recommended for measuring orthotic wearing time.