Device to aid in the administration of glyceryl tri-nitrate sublingual spray for patients with angina and impaired manual dexterity.

This is an adaptive study. The objective is to field test a device for assisting with the administration of angina spray in patients who have difficulty using proprietary GTN spray devices and evolve the prototype based on this experience so that a final version can be produced. Firstly patients will be selected for the study because they have expressed difficulty using the proprietary GTN spray devices. Alternatively they will have been observed to be experiencing difficulty using the devices. The Christchurch Hospital cardiac rehabilitation programme or Arthritis Society will provide useful settings for these patients to be identified. The cardiac rehabilitation programme provides aftercare for patients who have been in hospital having experienced a cardiac event for example myocardial infarction. It is hoped that sufficient patients will be identified in this manner for a meaningful trial of the device to be undertaken. If insufficient numbers of patients are identified an alternative avenue would be through General Practice. Once identified, patients will be shown and instructed in the use of the device, and if they are interested in becoming part of the trial will be given a prototype device to use. Patients will be followed up to obtain their feedback about the use of the device, with information being sought on the ease of administration, durability, ease of changing to a new spray once expired or used up, and other issues that may arise. Modifications to the device can then be made based upon feedback obtained..