The ADMIT series - issues in inhalation therapy. 6) Training tools for inhalation devices.

Inhaled medications are the preferred therapies for patients with asthma and COPD, but their effectiveness is limited by the patient's ability to use the device properly, an issue often neglected when these medications are prescribed. Correct inhaler technique must be taught and learnt, and requires educational and motivational programs aimed at patients and healthcare providers alike. Written instructions alone are manifestly insufficient: education must include practical demonstration and periodic re-assessment and reeducation, since correct technique and motivation usually deteriorate with time. Several devices are available on the market, the purpose of which is to train patients to use inhalers correctly. They are often directed at particular devices or groups of devices and/or particular critical aspects of technique. This paper reviews the devices currently available for training patients in the correct use of both pressurised metered-dose inhalers (pMDIs) and dry powder inhalers (DPIs).

The ADMIT series--issues in inhalation therapy. 5) Inhaler selection in children with asthma.

Many children with asthma do not use their inhalers correctly and consequently gain little or no therapeutic benefit from the treatment. The focus of inhalation therapy should be on those inhalers which are easiest to use correctly by various groups of children and the amount of tuition and training required to obtain a correct technique. It is recommended that clinicians focus on a limited number of inhalers. Most children can be taught effective inhalation therapy by using a pMDI, a pMDI with a spacer ,or a DPI. Most preschool children can be taught effective use of a pMDI and spacer with a valve system and a face mask. Therefore, this is the preferred mode of delivery in these age groups. When the child is capable of using the spacer without a face mask this administration technique should be adopted. In older children pMDIs are more difficult to use correctly than a pMDI with a spacer, a DPI ,or a breath-actuated pMDI. Because DPIs and breath-actuated pMDIs are more convenient to use these devices are normally considered the preferred inhalation devices in these age groups except for administration of beclometasone dipropionate, which for safety reasons should be delivered by a spacer.

The ADMIT series--issues in inhalation therapy. 3) Mild persistent asthma: the case for inhaled corticosteroid therapy.

Mild persistent asthma should be treated with continuous inhaled corticosteroids (ICS), which reduces exacerbations of disease, controls symptoms and reduces bronchial mucosal inflammation. Most patients can be controlled with low dosage ICS (

The ADMIT series--issues in inhalation therapy. 2. Improving technique and clinical effectiveness.

Aerosol inhalation is considered the optimal route for administering the majority of drugs for the treatment of obstructive airways diseases. A number of Pressurised Metered-Dose and Dry Powder Inhalers are available for this purpose. However, inhalation of therapeutic aerosols is not without difficulty; it requires precise instructions on the inhalation manoeuvre, which is different from spontaneous normal breathing. Also, the characteristics of the inhaler device have to be suitable for the user. Available data indicate a frequent lack of knowledge demonstrated by health professionals and patients on the inhalation manoeuvre and handling of inhalers, resulting in a reduction of therapeutic benefit. This paper reviews the literature concerning the fundamental aspects of inhaler devices, inhalation manoeuvre and device selection, in an attempt to increase the knowledge of, and to optimise the clinical use of, therapeutic inhalers.

Effect of incorrect use of dry powder inhalers on management of patients with asthma and COPD.

BACKGROUND: Incorrect usage of inhaler devices might have a major influence on the clinical effectiveness of the delivered drug. This issue is poorly addressed in management guidelines. METHODS: This article presents the results of a systematic literature review of studies evaluating incorrect use of established dry powder inhalers (DPIs) by patients with asthma or chronic obstructive pulmonary disease (COPD). RESULTS: Overall, we found that between 4% and 94% of patients, depending on the type of inhaler and method of assessment, do not use their inhalers correctly. The most common errors made included failure to exhale before actuation, failure to breath-hold after inhalation, incorrect positioning of the inhaler, incorrect rotation sequence, and failure to execute a forceful and deep inhalation. Inefficient DPI technique may lead to insufficient drug delivery and hence to insufficient lung deposition. As many as 25% of patients have never received verbal inhaler technique instruction, and for those that do, the quality and duration of instruction is not adequate and not reinforced by follow-up checks. CONCLUSIONS: This review demonstrates that incorrect DPI technique with established DPIs is common among patients with asthma and COPD, and suggests that poor inhalation technique has detrimental consequences for clinical efficacy. Regular assessment and reinforcement of correct inhalation technique are considered by health professionals and caregivers to be an essential component of successful asthma management. Improvement of asthma and COPD management could be achieved by new DPIs that are easy to use correctly and are forgiving of poor inhalation technique, thus ensuring more successful drug delivery.

Intravenous magnesium sulphate provides no additive benefit to standard management in acute asthma.

BACKGROUND: Treatment of acute asthma is based on rapid reversal of bronchospasm and airway inflammation. Magnesium sulphate (MgSO(4)) is known to have a bronchodilator effect on smooth muscle but studies have shown conflicting results on its efficacy in acute asthma, although its use is recommended in national and international guidelines. AIMS: To determine if intravenous MgSO(4), when used as an adjunct to standard therapy, improves the outcome in acute asthma. METHODS: A double blind, randomised placebo controlled trial comparing 1.2g MgSO(4) with standard therapy in adult patients with acute asthma. Patients had a PEF

A brief history of inhaled asthma therapy over the last fifty years.

This year is the 50th anniversary of the introduction into clinical use of the first modern inhaler for the management of asthma--the pressurised metered-dose inhaler (pMDI). The pMDI was initially used for the administration of the non-selective beta-agonists adrenaline and isoprenaline. However, the epidemic of asthma deaths which occurred in the 1960s led to these drugs being superseded by the selective short-acting beta-agonist salbutamol, and the first inhaled corticosteroid (ICS) beclomethasone. At the same time, sodium cromoglycate was introduced, to be administered via the first dry-powder inhaler--the Spinhaler--but owing to its relatively weak anti-inflammatory action its use is now very limited. Over the last 10 years, the long-acting beta-agonists (LABAs) have become an important add-on therapy for the management of asthma, and they are now often used with ICS in a single ICS/LABA combination inhaler.

How to achieve good compliance with inhaled asthma therapy.

Inability to use inhaler devices correctly is a major source of non-compliance in patients with asthma. The problem of coordinating dose release with inspiration seen with pressurised metered dose inhalers (pMDIs) is overcome by dry powder inhalers (DPIs), since they use inspiratory flow energy to carry the drug dose to the respiratory tract. The first DPIs were not popular because they were single dose devices and inconvenient to use. The introduction of multiple dose DPIs improved the image of the dry powder systems in the eyes of both the clinician and the patient. The continued development of DPIs has led to inhaler devices which include dose counters, are easy to use, are refillable and provide feedback to the patient on a correct inhalation. Criteria that may improve patient compliance with an inhaler include: correct use of the device by most patients; ease and convenience of device use; dose release even at low inspiratory flow rates; feedback of drug release which could instill confidence that the dose has been inhaled; cartridge refills and overall confidence in the device. The Novolizer has all the desirable features listed above and is expected to improve compliance if prescribed for the large number of patients who cannot use the conventional pMDI or less efficient DPSs.

Moving from CFC aerosol to HFA aerosol or dry powder inhalers: what do patients think?

BACKGROUND/OBJECTIVES: Environmentally friendly hydrofluoroalkane (HFA) pressurised metered-dose inhalers are currently being marketed to replace chlorofluorocarbon (CFC)-driven devices. It is uncertain whether these new formulations with different properties are acceptable to patients. Similarly, switching a patient to a dry powder inhaler (DPI) carries the risk of non-acceptance. METHODS: One hundred patients with obstructive airway disease on regular CFC aerosol inhaler medication underwent a standardised, structured interview. During the interview patients were asked to use a new HFA aerosol inhaler and three DPIs in random order. Patients' notions were recorded. RESULTS: Most patients (96) agreed to change from their CFC to the HFA inhaler, of those, only 12 did so with some reservation. Properties (taste, user-friendliness, design) of the HFA inhaler were rated favourably. DPIs represented an acceptable alternative to aerosol inhalers. In fact, 57 patients preferred a DPI over the HFA inhaler. Not all powder devices were equally acceptable. Replacing the CFC inhaler with patients' preferred alternative devices resulted in a more than 3-fold increase in costs. CONCLUSION: Concerns about the acceptability of reformulated CFC-free aerosol inhalers are ill founded. However, if given the choice, many patients prefer a DPI over the HFA inhaler. The transition offers an opportunity to review patients' current treatment and the proficiency of their inhaling technique. Moving to CFC-free inhalers will have revenue implications.