B. van den Berg

Burden of informal caregiving for stroke patients: Identification of caregivers at risk of adverse health effects

Background: We assessed the objective and subjective burden of caregiving for stroke patients and investigated which characteristics of the patient, the informal caregiver and the objective burden contribute most to subjective burden and to the condition of feeling substantially burdened. Methods: We studied a sample of 151 stroke survivors and their primary informal caregivers. We collected data through patient and caregiver interviews 6 months after stroke. Results: Both the level of subjective burden and the condition of feeling substantially burdened were associated with both caregiver’s and patient’s health-related quality of life, patient’s age, and the number of caregiving tasks performed. Conclusions: These conditions can be used in clinical practice to identify potentially vulnerable caregivers in need of support and at risk of adverse health effects. Monitoring stroke survivors as well as their family caregivers at discharge may help to prevent or alleviate caregiver burden.

What really matters: an inquiry into the relative importance of dimensions of informal caregiver burden

Objective: Prevailing measures of subjective caregiver burden either have no overall summary score or do not consider the relative importance caregivers attach to different dimensions of burden. Our aim was to assess which dimensions informal caregivers perceive as being important to their overall burden from care giving. Design: Cross-sectional. Subjects: Data were pooled from two Dutch samples of primary informal caregivers covering a wide range of chronic care-giving situations: caregivers for stroke survivors (n = 196) and caregivers for individuals with rheumatoid arthritis (RA) (n = 131). Main measures: Subjective burden of care giving was assessed using the Caregiver Reaction Assessment (CRA) and the Self-Rated Burden scale (SRB). Results: In the total sample four of the five dimensions of the CRA were found to contribute to the overall subjective burden experienced by informal caregivers. In the individual stroke and RA samples only two of the five dimensions emerged as relevant. SRB scores were significantly higher for caregivers of stroke patients, but no differences were found for the five dimensions of the CRA between the two samples. Conclusions: The dimensions of CRA are not equally important to the overall subjective burden of informal caregivers. To assess overall subjective burden, a measure based on a caregivers own assessment of burden such as SRB needs to be used in addition to prevailing measures.

Rate of progression and predictive factors for pulmonary outcome in children and adults with Pompe disease

Respiratory insufficiency is a serious threat to patients with Pompe disease, a neuromuscular disorder caused by lysosomal acid alpha-glucosidase deficiency. Innovative therapeutic options which may stabilize pulmonary function have recently become available. We therefore determined proportion and severity of pulmonary involvement in patients with Pompe disease, the rate of progression of pulmonary dysfunction, and predictive factors for poor respiratory outcome. In a single-center, prospective, cohort study, we measured vital capacity (VC) in sitting and supine positions, as well as maximum inspiratory (MIP) and expiratory (MEP) mouth pressures, and end expiratory CO(2) in 17 children and 75 adults with Pompe disease (mean age 42.7 years, range 5-76 years). Seventy-four percent of all patients, including 53% of the children, had some degree of respiratory dysfunction. Thirty-eight percent had obvious diaphragmatic weakness. Males appeared to have more severe pulmonary involvement than females: at a group level, their mean VC was significantly lower than that of females (p<0.001), they used mechanical ventilation more often than females (p=0.042) and the decline over the course of the disease was significantly different between males and females (p=0.003). Apart from male gender, severe skeletal muscle weakness and long disease duration were the most important predictors of poor respiratory status. During follow-up (average 1.6 years, range 0.5-4.2 years), three patients became ventilator dependent. Annually, there were average decreases in VC in upright position of 0.9% points (p=0.09), VC in supine position of 1.2% points (p=0.049), MIP of 3.2% points (p=0.018) and MEP of 3.8% points (p<0.01). We conclude that pulmonary dysfunction in Pompe disease is much more common than generally thought. Males, patients with severe muscle weakness, and those with advanced disease duration seem most at risk.

Expiratory time constants in mechanically ventilated patients with and without COPD.

Abstract Objective: In mechanically ventilated patients, the expiratory time constant provides information about the respiratory mechanics and the actual time needed for complete expiration. As an easy method to determine the time constant, the ratio of exhaled tidal volume to peak expiratory flow has been proposed. This assumes a single compartment model for the whole expiration. Since the latter has to be questioned in patients with chronic obstructive pulmonary disease (COPD), we compared time constants calculated from various parts of expiration and related these to time constants assessed with the interrupter method. Design: Prospective study. Setting: A medical intensive care unit in a university hospital. Patients: Thirty-eight patients (18 severe COPD, eight mild COPD, 12 other pathologies) were studied during mechanical ventilation under sedation and paralysis. Measurements and results: Time constants determined from flow-volume curves at 100%, the last 75, 50, and 25% of expired tidal volume, were compared to time constants obtained from interrupter measurements. Furthermore, the time constants were related to the actual time needed for complete expiration and to the patients pulmonary condition. The time constant determined from the last 75% of the expiratory flow-volume curve (RCfv75) was in closest agreement with the time constant obtained from the interrupter measurement, gave an accurate estimation of the actual time needed for complete expiration, and was discriminative for the severity of COPD. Conclusions: In mechanically ventilated patients with and without COPD, a time constant can well be calculated from the expiratory flow-volume curve for the last 75% of tidal volume, gives a good estimation of respiratory mechanics, and is easy to obtain at the bedside.

Metabolic and respiratory effects of enteral nutrition in patients during mechanical ventilation

AbstractThe effect of enteral feeding on O2-consumption (

Effect of continuous positive airway pressure (CPAP) in patients with chronic obstructive pulmonary chsease (COPD) depending on intrinsic PEEP levels

\dot V_{O_2 }

Effect of expiratory resistance on gas‐exchange and breathing pattern in chronic obstructive pulmonary disease (COPD) patients being weaned from the ventilator

) and CO2-production (