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Biomedical subjects

J B Andersen

Publications and source records attributed to J B Andersen.

At least 91 records · Page 5Linked to original sources
PubMed1986

Nebulised sodium cromoglycate in the treatment of wheezy bronchitis. A multicentre double-blind placebo controlled study.

The efficacy of nebulised sodium cromoglycate (SCG) used as a prophylactic treatment of wheezy bronchitis in children aged 1 to 4 years was evaluated in a multicentre double-blind placebo controlled, group comparative study. Fifty-four patients completed the 10-week trial (29 treated with SCG and 25 treated with placebo), preceded by 4-8 weeks baseline. Nebulised SCG did not prove significantly superior to placebo in reducing day wheezing, day coughing, or sleep disturbance due to wheezing or coughing at night. Neither was there significant difference in the use of supportive medicine (beta 2-agonist and theophylline) between the groups. Extra doctor visits, hospital admissions, and parental preference did not show significant difference either.

Aerosols↗
PubMed1986

Peripheral airway pressure during high frequency ventilation.

Peripheral airway pressure (Pp) was measured during high frequency ventilation (HFV) (open system) (1-20 Hz) by retrograde catheters in eight excised dog lungs. Central airway pressure (Pc) and pleural pressure (Ppl) were measured simultaneously. We found a significant increase in peripheral end-expiratory pressure at frequencies 5 Hz and higher, when the minute ventilation was increased. Mean Pc and mean Pp remained unchanged during ventilation at different frequencies with constant minute ventilation, although tidal volume decreased. With increasing tidal volume Pc, Pp, and Ppl (mean) increased at all frequencies. The increase in end-expiratory pressure indicates an "auto-PEEP" effect, which may contribute to the better gas exchange described during HFV.

Animals↗
PubMed1985

Effect of subcutaneous salbutamol on postoperative pulmonary function in patients undergoing elective cholecystectomy.

In a double-blind study, 14 patients underwent elective cholecystectomy. The patients were randomly allocated to two groups of seven to receive either s.c. salbutamol 0.5 mg or placebo 0.5 mg immediately before extubation and every 6 h for 48 h. In the placebo group there was a significant reduction in mean arterial oxygen tension of seven patients 3, 27 and 51 h after surgery (P = 0.006, P = 0.01 and P = 0.02) compared with the mean value before operation. The reduction in mean arterial oxygen tension in the group receiving salbutamol was not significant 3 h after surgery (P = 0.13), whereas reduction was significant 27 and 51 h later (P = 0.01 and P = 0.02) compared with the mean value before operation. Mean arterial oxygen tension was significantly higher in the salbutamol group than in the placebo group 3 h after operation (P = 0.03), whereas it was not significant 27 and 51 h later (P = 0.48 and P = 0.55). Mean spirometric values showed significant reductions 27 and 51 h after operation in both groups compared with the pre-operative measurements. Smaller insignificant differences were found between the salbutamol and placebo groups 27 and 51 h after operation. However, mean FEV1 in the salbutamol group 51 h after operation was 22% higher in comparison with the placebo group. Our results suggest that salbutamol may reduce postoperative hypoxaemia during the first few hours after the operation, but not later on.

Adult↗
PubMed1985

Relieving dyspnea with an inexpensive and simple method in patients with severe chronic airflow limitation.

The effect of inspiratory resistive breathing training using a simple apparatus was tested in 27 optimally medicated consecutive outpatients with severe chronic airflow limitation, randomly assigned to a test and a control group. Patients trained in their homes for up to 10 min thrice daily and increments in resistance were made, if possible, every fortnight. The control group used the same apparatus, but without inspiratory resistance. Three months from the start of training, the following statistically significant differences between the 2 groups were observed: a marked decrease in dyspnea in the trained group, a 60% versus 22% rise in endurance time on a cycle ergometer at 2/3 of maximal work load, a fall in functional residual capacity, and a fall in respiratory frequency both at rest and during exercise.

Airway Resistance↗
PubMed1984

A clinical comparison of aerosol and powder administration of beclomethasone dipropionate in childhood asthma.

Forty children with childhood asthma were conducted through a double-blind cross-over study to compare the effect of 400 micrograms beclomethasone dipropionate administered as aerosol and powder (Rotacaps). Children with severe asthma derived more benefit from the steroid administered as aerosol judged from their peak flow performance in the morning, although neither evening peak flow nor symptom scores revealed any difference. It is concluded that the Rotacaps are an advantageous supplement to available medication for the treatment of asthmatic children, although it should be observed that, using equal amounts of BDP, powder administration seems less effective than aerosol.

Adolescent↗
PubMed1984

Clinical experience with inspiratory resistive breathing training.

Seventy-seven outpatients with disabling chronic obstructive pulmonary disease have been subjected to a 3-month regimen of inspiratory resistive breathing training using the PEP/RMT set (Astra Meditec). Pulmonary function and exercise tolerance on a cycle ergometer or the 12 min. walking distance were obtained pre- and post-training. A special dyspnoea scoring system was also applied. Sixty-three patients experienced significant benefit from training. Pulmonary function did not change, but a substantial increase in exercise tolerance and a decrease of dyspnoea were apparent, where training was successful.

Breathing Exercises↗
PubMed1984

Improving the ketchup bottle method with positive expiratory pressure, PEP, in cystic fibrosis.

We studied the acute effects of 4 different chest physical therapy regimens using a randomised cross-over design in 14 patients with cystic fibrosis. Treatment A consisted of postural drainage, percussion and vibration; treatment B of postural drainage and periodic application of a face mask with positive expiratory pressure (PEP); treatment C of PEP in the sitting position; treatment D of the forced expiration technique in the sitting position. In terms of sputum expectorated, treatments B and C were superior to treatment D and especially to treatment A (p less than 0.05). Skin oxygen tension, PSO2 was monitored continuously during and for 35 min after treatment. A substantial and prolonged decay in PSO2 was observed during treatment A, quite different from other patterns seen. During and even following treatment C, an increase in PSO2 was noted. PEP was well accepted by the patients, who preferred treatment C, and we suggest it is incorporated in chest physical therapy regimens if the therapeutic objective is to increase expectoration.

Adolescent↗
PubMed1982

Near-field absorption in a circular cylinder from electric and magnetic line sources.

A homogeneous, lossy circular cylinder is used as a simple model of a biological object in which interior heating is produced by the absorption of electromagnetic waves. For this model, we determined the optimum frequency, polarization, orientation and shape of applicators. Analytical and numerical results are given for both electric and magnetic line sources, with three different polarizations relative to the cylinder. Coupling efficiencies and contour plots are presented for a range of parameters. One particularly interesting result is the production of maximum energy deposition at the center of a cylinder of muscle tissue when exposed in the 100-MHz frequency range by the use of four applicators surrounding the cylinder.

Diathermy↗
PubMed1982

Noninvasive detection of sublobar bronchial obstructions. An experimental study.

The objective of this study was to develop a noninvasive radiographic method for detection of sublobar bronchial obstructions. The study was primarily done in dogs, where the obstruction was made experimentally. Inspiratory and expiratory films did not show any obvious density difference between lung parenchyma distal to the obstruction and the surrounding lung. A short application of positive end-expiratory pressure immediately followed by a forced expiration, created localized air trapping with relative radiolucency of the lung tissue distal to the obstruction. This method, easily applicable to human studies, may prove useful in early diagnosis of lung cancer with intraluminal obstruction and in detecting non-radiopaque airway foreign bodies. As an example of human application a case of lung cancer in a 57-year-old man is presented.

Animals↗
PubMed1982

A new mode of administration of nebulized bronchodilator in severe bronchospasm.

We studied the effect of adding positive end expiratory pressure, PEEP, during the administration of a nebulized bronchodilator in eight patients with acute respiratory failure and severe bronchospasm. Respiratory failure was diagnosed by means of an arterial blood gas analysis and bronchospasm by the presence of wheezing, dyspnea, cough and a forced expiratory volume in the first second, FEV1, of less than 0.7 L. A randomized cross over design was used, where each patient was subjected to two PEEP treatments and two control treatments with zero end expiratory pressure, ZEEP. The interval between each treatment was three hours. With ZEEP, FEV1 rose from 0.69 +/- 0.31 to 1.03 +/- 0.23 L and with PEEP from 0.66 +/- 0.28 to 1.50 +/- 0.48 L (P less than 0.05). Similar changes were seen in forced vital capacity and in peak flow. These results demonstrate that PEEP improves the efficacy of an inhaled, nebulized bronchodilator. This effect is probably mediated through a better distribution especially in peripheral airways.

Bronchial Spasm↗