Adult Contractures in Burn Injury: A Burn Model System National Database Study

As the overall survival rate for burn injury has improved, increased emphasis is placed on postburn morbidity and the optimization of functional and cosmetic outcomes. One major cause of morbidity and functional deficits is that of joint contractures. The true incidence of postburn contractures and their associated risk factors remains unknown. This study examines the incidence and severity of contractures in a large, multicenter, burn population. The associated risk factors for the development of contractures are determined. Data from the National Institute on Disability and Rehabilitation Research Burn Model System database, for adult burn survivors from 1994 to 2003, were analyzed. Demographic and medical data were collected on each subject. The primary outcome measures included the presence of contractures, number of contractures per patient, and severity of contractures at each of nine locations (shoulder, elbow, hip, knee, ankle, wrist, neck, lumbar spine, and thoracic spine) at time of hospital discharge. Regression analysis was performed to determine predictors of the presence, severity, and numbers of contractures, with P < .05 used for statistical significance. Of the 1865 study patients, 620 (33%) developed at least 1 contracture at hospital discharge. Among those with at least one contracture, the mean is three (3.38) contractures per person. The shoulder was the most frequently contracted joint (23.0%), followed by the elbow (19.9%), wrist (17.3%), ankle (13.6%), and knee (13.4%). Most contractures were mild (47.2%) or moderate (32.9%) in severity. Statistically significant predictors of contracture development were male sex, black race, Hispanic ethnicity, medical problems, neuropathy, TBSA grafted, and TBSA burned. Predictors of the severity of contracture included male sex, black race, medical problems, neuropathy, TBSA grafted, and TBSA burned. Predictors of the number of contractures included male sex, medical problems, flash burn, neuropathy, TBSA burned, and TBSA grafted. Similar to a previous single-center study on postburn contractures, approximately one third of the patients with an eligible burn injury requiring autografting developed a contracture at hospital discharge. It is likely that these contractures develop despite early therapeutic interventions such as positioning and splinting; therefore, the challenge to the burn community remains, to identify new and better prevention strategies.

Exercise efficiency is reduced by mitochondrial uncoupling in the elderly

A reduction in exercise efficiency accompanies ageing in humans. Here we evaluated the impact of changes in the contractile-coupling and mitochondrial-coupling efficiencies on the reduction in exercise efficiency in the elderly. Nine adult (mean, 38.8 years old) and 40 elderly subjects (mean, 68.8 years old) performed a cycle ergometer test to measure O2 uptake and leg power output up to the aerobic limit ( ). Reduced leg power output per unit O2 uptake was reflected in a drop in delta efficiency (εD) from 0.27 ± 0.01 (mean ± SEM) in adults to 0.22 ± 0.01 in the elderly group. Similar declines with age were apparent for both the leg power output at and the ATP generation capacity (ATPmax) determined in vivo using (31)P magnetic resonance spectroscopy. These similar declines resulted in unchanged contractile-coupling efficiency values (εC) in the adult (0.50 ± 0.05) versus the elderly group (0.58 ± 0.04) and agreed with independent measures of muscle contractile-coupling efficiency in human quadriceps (0.5). The mitochondrial-coupling efficiency calculated from the ratio of delta to contractile-coupling efficiencies in the adults (εD/εC = 0.58 ± 0.08) corresponded to values for well-coupled mitochondria (0.6); however, εD/εC was significantly lower in the elderly subjects (0.44 ± 0.03). Conversion of ATPmax per mitochondrial volume (ATPmax/Vv[mt,f]) reported in these groups into thermodynamic units confirmed this drop in mitochondrial-coupling efficiency from 0.57 ± 0.08 in adults to 0.41 ± 0.03 in elderly subjects. Thus, two independent methods revealed that reduced mitochondrial-coupling efficiency was a key part of the drop in exercise efficiency in these elderly subjects and may be an important part of the loss of exercise performance with age.

Burns as a Result of Assault: Associated Risk Factors, Injury Characteristics, and Outcomes

The purpose of this study was to identify specific premorbid factors and injury characteristics associated with intentional burn injuries and to compare outcomes for individuals injured by assault and those with unintentional injuries. Participants sustaining major burns from May 1994 to August 2005 and consenting to a multisite, prospective, longitudinal outcome study were included. Etiology of the injury was classified as intentional (i.e., assault) or unintentional. Subjects <18 years old or with self-inflicted burns were excluded. Statistical analysis was performed with t-tests, chi2 tests, and analysis of variance. Eighty patients sustained intentional burn injuries and 1982 subjects sustained nonintentional burn injuries. Compared to patients with nonintentional burns, those with burns related to assault were more likely to be female, black, and unemployed and to have higher rates of premorbid substance use. Between the groups, there were no significant differences in preinjury living situation, education level, history of psychiatric treatment, or hospital length of stay. The intentional-burn group had larger burns and a greater in-hospital mortality rate, and these patients were less likely to be discharged to home. They also demonstrated significantly greater levels of psychological distress during the acute hospitalization but not at follow-up. Understanding the unique characteristics and needs of patients with intentional burn injuries is important because these individuals are less likely to have a steady income and more likely to rely on community social services. Affordable and accessible community-based health services are necessary in order to improve their outcomes.

Early Unplanned Transfers from Inpatient Rehabilitation

OBJECTIVE

To identify characteristics of patients who transfer off inpatient rehabilitation to a surgical or medical unit before completion of their rehabilitation program.

DESIGN

A retrospective 9-yr chart review of patients transferred off the rehabilitation unit at a regional level 1 trauma center due to medical complications.

RESULTS

Of 3072 patient admissions, 250 (8%) were transferred to an acute medical or surgical unit, and 55 (22%) of those transfers were within 3 days. Of the 250 patients, 33% had traumatic brain injury, 23% had spinal cord injury, 24% had stroke, 2% had amputations, 18% were in other diagnostic groups, and 23% were >64 yrs of age. When patients transferred early, only 47% were ultimately discharged to home, compared with approximately 72% of all discharges. The most common reasons for early transfer in these patients were infection (22%) and pulmonary complications (14%). Risk factors for early discharge included age of >64 yrs, spinal cord injury, or amputation.

CONCLUSION

Patients admitted to the inpatient rehabilitation unit who have spinal cord injuries, amputations, or are >64 yrs old may have more medical/surgical complications. More detailed study of this patient population may help reduce the number of early transfers off the inpatient rehabilitation unit.

Validity of the Patient Health Questionnaire-9 in assessing depression following traumatic brain injury

OBJECTIVE

To test the validity and reliability of the Patient Health Questionnaire-9 (PHQ-9) for diagnosing major depressive disorder (MDD) among persons with traumatic brain injury (TBI).

DESIGN

Prospective cohort study.

SETTING

Level I trauma center.

PARTICIPANTS

135 adults within 1 year of complicated mild, moderate, or severe TBI.

MAIN OUTCOME MEASURES

PHQ-9 Depression Scale, Structured Clinical Interview for Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (SCID).

RESULTS

Using a screening criterion of at least 5 PHQ-9 symptoms present at least several days over the last 2 weeks (with one being depressed mood or anhedonia) maximizes sensitivity (0.93) and specificity (0.89) while providing a positive predictive value of 0.63 and a negative predictive value of 0.99 when compared to SCID diagnosis of MDD. Pearson's correlation between the PHQ-9 scores and other depression measures was 0.90 with the Hopkins Symptom Checklist depression subscale and 0.78 with the Hamilton Rating Scale for Depression. Test-retest reliability of the PHQ-9 was r = 0.76 and kappa = 0.46 when using the optimal screening method.

CONCLUSIONS

The PHQ-9 is a valid and reliable screening tool for detecting MDD in persons with TBI.

Baclofen pump intervention for spasticity affecting pulmonary function

INTRODUCTION

Muscle spasticity may adversely affect pulmonary function after spinal cord injury (SCI). However, there is limited information regarding the treatment of spasticity as a determinant of pulmonary function. This study presents the case of a man with C4 tetraplegia who had severe spasticity and difficulty weaning from ventilatory support.

METHODS

Case presentation.

RESULTS

Severe spasticity likely contributed to respiratory compromise in this patient. Successful and rapid weaning from the ventilator occurred within 3 weeks of baclofen pump placement.

CONCLUSIONS

Randomized clinical trials among SCI patients with significant spasticity are needed to determine whether intervention with a baclofen pump facilitates earlier ventilatory weaning.

Development of a Telephone Follow-up Program for Individuals Following Traumatic Brain Injury

OBJECTIVE

To describe the development of a telephone follow-up program that addresses the needs of survivors of traumatic brain injury (TBI) and their families in the year following injury. The process of developing the program is reviewed from the initial steps of identifying needs through final implementation of the program.

PARTICIPANTS

Eighty-four TBI survivors with moderate to severe injuries and their families.

RESULTS

Descriptive statistics are presented including number of contacts, areas of concern for participants, and the types of interventions conducted. Case examples are provided to illustrate the impact of the telephone follow-up program.

CONCLUSION

This project demonstrated the feasibility of using the telephone as a means of providing information and support during the first year after moderate to severe traumatic brain injury. Telephone follow-up may enhance service provision for persons with TBI, especially those with a lack of transportation or geographic isolation.

Brain function early after stroke in relation to subsequent recovery

This study aimed to characterize brain activation and perfusion early after stroke within cortical regions that would later change activation during recovery. Patients were studied serially after stroke (mean t1, = 16 days after stroke, t2 = 3.5 months later) using perfusion-weighted imaging and functional magnetic resonance imaging during finger movement. Controls (n = 7) showed no significant change in regional activation volumes over time. Among stroke patients (n = 8), however, recovery was accompanied by several patterns of functional magnetic resonance imaging change, with increased activation volumes over time in five patients and decreased in two. Most regions increasing activation over time were in the stroke hemisphere. Of the five patients showing increased activation over time, specific activation foci enlarged at t2 were already activated at t1 in four patients, and at least one focus growing from t1 to t2 was in a different arterial distribution from the infarct in all five patients. Perfusion of sensorimotor cortex at t1 was generally not reduced in the stroke hemisphere (94% of noninfarcted hemisphere). Improved clinical outcome was related to increased activation within sensory cortices of both brain sides, including bilateral secondary somatosensory areas. Early after stroke, cortical activation that will later increase in parallel with recovery is often already identifiable, can be remote from the vascular territory of the infarct, and is not likely hindered by reduced perfusion. The findings may be useful for restorative interventions introduced during the weeks after a stroke.

The Use of a World Wide Web-based Consultation Site to Provide Support to Telephone Staff in a Traumatic Brain Injury Demonstration Project

OBJECTIVES

Distance from expertise in traumatic brain injury (TBI) is often an impediment to appropriate TBI care from local health care providers, especially in rural areas. To overcome this barrier to care and to support a randomized, controlled trial of telephone follow-up after discharge from acute rehabilitation, we demonstrated the use of a confidential consultation Web site to provide expert recommendations and advice to front-line telephone staff at a different site.

CONCLUSIONS

This use of Internet communication proved convenient to all users, improved client confidence, and served as an excellent training tool to less experienced staff. In addition, use of a Web-based consultation method provided for archiving of all discussions for later review.

Motor cortex activation is preserved in patients with chronic hemiplegic stroke

Many central nervous system conditions that cause weakness, including many strokes, injure corticospinal tract but leave motor cortex intact. Little is known about the functional properties of surviving cortical regions in this setting, in part because many studies have used probes reliant on the corticospinal tract. We hypothesized that many features of motor cortex function would be preserved when assessed independent of the stroke-affected corticospinal tract. Functional MRI was used to study 11 patients with chronic hemiplegia after unilateral stroke that spared regions of motor cortex. Activation in stroke-affected hemisphere was evaluated using 3 probes independent of affected corticospinal tract: passive finger movement, a hand-related visuomotor stimulus, and tapping by the nonstroke index finger. The site and magnitude of cortical activation were similar when comparing the stroke hemisphere to findings in 19 control subjects. Patients activated each of 8 cortical regions with similar frequency as compared to controls, generally with a smaller activation volume. In some cases, clinical measures correlated with the size or the site of stroke hemisphere activation. The results suggest that, despite stroke producing contralateral hemiplegia, surviving regions of motor cortex actively participate in the same proprioceptive, visuomotor, and bilateral movement control processes seen in control subjects.

Dexter: a tool to facilitate impairment ratings

Calculating impairment in burn patients is crucial to understanding outcome. However, it is rarely reported after burns, presumably because the process of calculating impairment ratings is complicated and tedious. Computerized systems have been developed that facilitate the process, but it has not been established in burn patients that these systems reduce the time required to calculate impairment. We evaluated the Dexter Evaluation and Therapy System by Cedaron Medical Inc (Davis, CA). A sample of 10 manually recorded ratings was compared with 10 performed on the Dexter. Mean time for the manual technique was 65 +/- 35 minutes versus 37 +/- 13 minutes for the Dexter (P < .05, Mann-Whitney). The time taken to perform impairment ratings in burn survivors is significantly reduced by the use of the Dexter system. Time saving occurs primarily at three points: (1) electronic data entry directly from the measuring instruments, (2) compilation of data, and (3) rapid generation of reports.

Discharge disposition from acute care after traumatic brain injury: the effect of insurance type

OBJECTIVE

To determine if persons with traumatic brain injury (TBI) who are insured by Medicaid or health maintenance organizations (HMOs) are more likely to receive postacute care in skilled nursing facilities (SNFs) than in rehabilitation facilities, compared with persons insured by commercial fee-for-service (FFS) plans.

DESIGN

Retrospective cohort study.

SETTING

County hospital admitting 30% of all Washington State TBI patients.

PATIENTS

Patients with moderate to severe TBI discharged to rehabilitation facilities or SNFs between 1992 and 1997 (n = 1271); 56.3% were insured by Medicaid, 26.1% by FFS plans, and 17.6% by HMOs.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Disposition on discharge from acute care (rehabilitation facilities vs SNF); adjusted relative risk (RR) and confidence interval (CI) for different insurance types.

RESULTS

After accounting for confounding factors, Medicaid patients were 68% more likely (RR = 1.68, 95% CI = 1.34-2.11) and HMO patients were 23% more likely (RR = 1.23, 95% CI =.90-1.68) to go to a SNF than FFS patients. However, the latter difference was not statistically significant.

CONCLUSIONS

An association exists between insurance type and postacute care site. Efforts should be made to determine the effect this relationship has on the cost and outcomes for TBI patients.

The effects of movement velocity, mass displaced, and task certainty on associated postural adjustments made by normal and hemiplegic individuals

The activation times for trunk and leg muscles were examined in normal and left hemiplegic subjects who raised their right arms at different velocities in self-paced or reaction time conditions. Activity in these postural muscles preceded arm displacement, and they were activated in a similar sequence during all types of rapid movements. The presence and sequencing of associated postural adjustments were more variable during slow movements.

Local muscle blood flow and temperature responses to 915MHz diathermy as simultaneously measured and numerically predicted

The therapeutic benefits of diathermy are tied to the relationship thought to exist between tissue temperature and augmented blood flow (BF). To further define this relationship, simultaneous measurements of thigh muscle blood flow (MBF) and temperature have been made in 15 human subjects during 915MHz, direct-contact microwave diathermy (MWD) with simultaneous skin cooling. Tissue temperatures were measured invasively by special thermistor probes designed to minimize MW-induced artifacts, and the local rates of MBF were measured by monitoring the radioactive washout of injected Xenon133 (Xe133). The experimental results have shown that the initial MBF response is characterized by a "critical temperature" behavior such that rapid increases in MBF occur for tissues above approximately 42C when diathermy power is sufficient. A proportionality between tissue temperature and MBF has not been found. To provide more useful descriptions of the temperature fields and diathermic BF responses, two-dimensional numerical thermal simulations of six of the subjects' treatments were constructed and recorded. An average peak simulated MBF of 48ml/min-100g was found for these subjects, a level in excess of previous estimates for maximum perfusion during diathermy.