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Growth Hormone Treatment Without a Needle Using the Preci-Jet 50

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Growth Hormone Treatment Without a Needle Using the Preci-Jet 50 Archives of Disease in Childhood 1997;76:65–67 65 Growth hormone treatment without a needle Arch Dis Child: first published as 10.1136/adc.76.1.65 on 1 January 1997. Downloaded from using the Preci-Jet 50 transjector P Bareille, M MacSwiney, A Albanese, C De Vile, R Stanhope Abstract Patients and methods A new delivery system (Preci-Jet 50) Twenty eight patients (11 girls, 17 boys) were which administers growth hormone randomly selected from the endocrine clinic at through the skin using high pressure and Great Ormond Street Hospital for Children. without a needle was evaluated. This All patients were receiving growth hormone device was inconvenient and painful com- treatment, 19 through an autoinjector and nine pared with a pen injection system. The with needles and syringes. None was using a conclusion is that the Preci-Jet is not the pen injector system at that time but nine had used one previously. The exclusion criteria panacea for solving the problem of com- were bleeding disorders and diseases of colla- pliance with subcutaneous growth hor- gen synthesis. Mean age was 10.1 (range mone injections. 5.7–16.7) years. The growth hormone dose ( 1997;76:65–67) Arch Dis Child range was from 15 to 30 IU/m2 body surface area/week. The subjects were randomly subdi- Keywords: growth hormone treatment; transcutaneous high pressure administration (jet); needle phobia. vided into two groups, A and B. Sex distribu- tion was similar in both groups but mean age diVered, with values of 8.7 and 11.2 years in groups A and B respectively. The study design The number of children treated with growth was for each group to have growth hormone hormone has increased dramatically over the treatment using either the pen (Kabi Pen last 10 years.1 Unfortunately, growth hormone manufactured by Pharmacia Upjohn) or the treatment must be given by daily subcutaneous Preci-Jet for six weeks followed by the alterna- injections often for several years, posing tive device. At the end of each six week period obvious problems of acceptance and the patients completed a questionnaire in the compliance.2 Two methods are commonly used presence of a growth research nurse, rating for administering growth hormone instead of both general convenience and pain on a scale of −5 to +5 (the highest score corresponding to the traditional syringe and needle: a pen http://adc.bmj.com/ injection3 system and an autoinjector.4 The lat- the most favourable response). At the end of ter have certainly improved acceptability of the study the patients continued growth growth hormone treatment. However, these hormone administration with the method of their choice. devices involve the use of a needle. Knowing Eight children (two of whom participated in that the mere sight of a needle may be sufficient the above trial) carried on using the Preci-Jet to cause distress, neither the pen nor the auto- for several months and were assessed sepa- injector have solved the problem of compliance rately. Their mean age at the onset of treatment on September 28, 2021 by guest. Protected copyright. for some children. One potential method of with the jet was 9.3 (range 4–12) years. avoiding the use of a needle is a transcutaneous The Preci-Jet 50 transjector was manufac- high pressure device (jet). Thus we have used a tured by Advanced Medical Technologies, Preci-Jet originally designed for insulin5 and Charlottetown, Prince Edward Island C1E later adapted for growth hormone administra- 1BO, Canada5 and is shown in fig 1. tion. This system administers the peptide hor- mone directly through the skin using high pressure and without a needle. It has been shown that plasma levels and absorption kinet- ics obtained with the Preci-Jet transjector are similar to those attained by cutaneous injection Great Ormond Street using a needle (personal communication: Hospital for Children Serono Laboratories data). These data are in NHS Trust, Great 6 Ormond Street, agreement with those reported for insulin. It is London WC1N 3JH therefore appropriate to consider using the P Bareille Preci-Jet in patients who have diYculty accept- Figure 1 The Preci-Jet 50 for transcutaneous administration of growth hormone. The nozzle for delivery M MacSwiney ing repeated injections. A Albanese of growth hormone is on the left of the device. A growth C De Vile In this study, we report the results of a hormone ampoule and attachment for filling the device is randomised crossover trial of Preci-Jet 50 illustrated. A centimetre rule is shown. The device propels R Stanhope fluid at high pressure through a fine orifice, which pierces against a pen injection system performed in 28 the epidermis and spreads within the subcutaneous tissues. Correspondence to: patients. Furthermore, we have evaluated the There are six pressure adjustment settings in the device and Dr Stanhope. the most suitable setting for skin thickness and site of longer term outcome of a further eight children transjection is found by trial and error for the individual Accepted 11 October 1996 who have used the Preci-Jet for up to two years. patient. 66 Bareille, MacSwiney, Albanese, De Vile, Stanhope pen p jet p jet p pen p Arch Dis Child: first published as 10.1136/adc.76.1.65 on 1 January 1997. Downloaded from +5 * +5 ** 0 0 Pain scoring for group B Pain scoring for group A 5 5 pen c jet c jet c pen c +5 # +5 ## 0 0 5 5 Convenience scoring for group A Convenience scoring for group B Figure 2 Individual results for pain scoring with the pen (pen p) or the jet (jet p) and for convenience scoring with the pen (pen c) or the jet (jet c) for groups A (n=12) and B (n=8); *p=0.04; **p=0.05; #p=0.04; ##p=0.02. In group B one child completed the study but did not answer the questionnaire. Means are designated by bars. Non-parametric methods (Wilcoxon survivor of malignant disease; his needle matched pairs signed ranks test) were used for phobia had been the consequence of chemo- statistical analysis. Ethical committee approval therapy. was obtained at Great Ormond Street Hospital and a consent form signed by the parents/ Discussion This study shows a preference for the pen guardians. http://adc.bmj.com/ delivery system over the Preci-Jet, although this only achieved a low level of statistical signifi- Results cance. The rejection of the Preci-Jet is very At the end of the study, 12 patients continued clear when one considers that only three with the pen whereas only two elected to use children of the 28 (one drop out and two who the Preci-Jet. Six returned to the autoinjector completed the trial) chose to continue with the and one to needle and syringe. Of the seven Preci-Jet. The drawbacks of the Preci-Jet far children who did not complete the trial, five outweighed the main potential advantage of the on September 28, 2021 by guest. Protected copyright. gave up the jet (excessive discomfort), one absence of a needle. Not only was it inconven- refused to surrender the jet, and another ient, but it was also traumatic and frequently stopped growth hormone treatment. caused bleeding and pain. Five children could The patients’ scoring of the two methods of not tolerate using the jet and therefore growth hormone administration is shown in fig withdrew from the trial. Nevertheless, a 2. The children found the pen less painful quarter of the patients appeared satisfied with (p<0.05) and more convenient (p<0.04). The the Preci-Jet (one drop out and six who main reasons given for their decision to give up completed the trial) but more than half of these the jet were bruising and bleeding (n=9) as well eventually elected to use another mode of as time consuming and complicated to operate administration. The jet device could be, in cer- (n=12). The absence of a needle was the main tain patients, a temporary way of administering lure for those who decided to carry on with the growth hormone before full acceptance of jet. alternative methods. Children who persisted In addition to the patients selected for the with the jet for one year or more were needle above trial, we have also used the Preci-Jet in phobic as the result of previous chemotherapy eight patients with needle phobia for an average for cancer or leukaemia. Despite this, they period of 8 (range 4–24) months. Only two eventually returned to another mode of admin- children were still using the Preci-Jet at the istration and overcame their fear of needles. time of inquiry and just for six months. All the We conclude that the Preci-Jet 50, despite its others eventually abandoned it because of fre- absence of a needle, cannot replace the classical quent bruises (predominant reason) and in- growth hormone delivery systems for the convenience. Two children had suVered from purpose of improving compliance. local skin blistering. One patient who had per- Nevertheless, this device may be beneficial to a sisted with the Preci-Jet for two years was a selected group of needle phobic patients, Preci-Jet 50 transjector for growth hormone treatment 67 2 Smith SL, Hindmarsh PC, Brook CGD. Compliance with particularly those who have received long term Arch Dis Child: first published as 10.1136/adc.76.1.65 on 1 January 1997. Downloaded from growth hormone treatment—are they getting it? Arch Dis chemotherapy for treatment of malignant Child 1993;68:91-3. disease. Further development of transcutane- 3 Gluckman PDG, Cutfield WS.
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