Evaluation of two health status measures in adults with growth hormone deficiency

State of the Art of Patient-reported Outcomes in Acromegaly or GH Deficiency: A Systematic Review and Meta-analysis

CONTEXT

Insight into the current landscape of patient-reported outcome (PRO) measures (PROM) and differences between PROs and conventional biochemical outcomes is pivotal for future implementation of PROs in research and clinical practice. Therefore, in studies among patients with acromegaly and growth hormone deficiency (GHD), we evaluated (1) used PROMs, (2) their validity, (3) quality of PRO reporting, (4) agreement between PROs and biochemical outcomes, and (5) determinants of discrepancies.

EVIDENCE ACQUISITION

We searched 8 electronic databases for prospective studies describing both PROs and biochemical outcomes in acromegaly and GHD patients. Quality of PRO reporting was assessed using the International Society for Quality of Life Research (ISOQOL) criteria. Logistic regression analysis was used to evaluate determinants.

EVIDENCE SYNTHESIS

Ninety studies were included (acromegaly: n = 53; GHD: n = 37). Besides nonvalidated symptom lists (used in 37% of studies), 36 formal PROMs were used [predominantly Acromegaly Quality of Life Questionnaire in acromegaly (43%) and Quality of Life-Assessment of Growth Hormone Deficiency in Adults in GHD (43%)]. Reporting of PROs was poor, with a median of 37% to 47% of ISOQOL items being reported per study. Eighteen (34%) acromegaly studies and 12 (32%) GHD studies reported discrepancies between PROs and biochemical outcomes, most often improvement in biochemical outcomes without change in PROs.

CONCLUSIONS

Prospective studies among patients with acromegaly and GHD use a multitude of PROMs, often poorly reported. Since a substantial proportion of studies report discrepancies between PROs and biochemical outcomes, PROMs are pivotal in the evaluation of disease activity. Therefore, harmonization of PROs in clinical practice and research by development of core outcome sets is an important unmet need.

Combined resistance and aerobic exercise intervention improves fitness, insulin resistance and quality of life in survivors of childhood haemopoietic stem cell transplantation with total body irradiation

PURPOSE

To investigate the effects of a supervised combined resistance and aerobic training programme on cardiorespiratory fitness, body composition, insulin resistance and quality of life (QoL) in survivors of childhood haematopoietic stem cell transplantation (HSCT) with total body irradiation (TBI).

PARTICIPANTS

HSCT/TBI survivors (n = 20; 8 females). Mean (range) for age at study and time since HSCT/TBI was 16.7 (10.9-24.5) and 8.4 (2.3-16.0) years, respectively.

METHODS

After a 6-month run-in, participants undertook supervised 45- to 60-minute resistance and aerobic training twice weekly for 6 months, with a 6-month follow-up. The following assessments were made at 0, 6 (start of exercise programme), 12 (end of exercise programme) and 18 months: Body composition via dual energy X-ray absorptiometry, homeostatic model assessment of insulin resistance (HOMA-IR), cardiorespiratory fitness (treadmill-based peak rate of oxygen uptake (VO₂ peak) test), QoL questionnaires (36-Item Short Form Health Survey (SF-36) and Minneapolis-Manchester Quality of Life Instrument (MMQL).

RESULTS

Results expressed as mean (standard deviation) or geometric mean (range). There were significant improvements in VO₂ peak (35.7 (8.9) vs 41.7 (16.1) mL/min/kg, P = 0.05), fasted plasma insulin (16.56 (1.48-72.8) vs 12.62 (1.04-54.97) mIU/L, P = 0.03) and HOMA-IR (3.65 (0.30-17.26) vs 2.72 (0.22-12.89), P = 0.02) after the exercise intervention. There were also significant improvements in the SF-36 QoL general health domain (69.7 (14.3) vs 72.7 (16.0), P = 0.001) and the MMQL school domain (69.1 (25.2) vs (79.3 (21.6), P = 0.03) during the exercise intervention. No significant changes were observed in percentage body fat, fat mass or lean mass.

CONCLUSION

The supervised 6-month combined resistance and aerobic exercise programme significantly improved cardiorespiratory fitness, insulin resistance and QoL in childhood HSCT/TBI survivors, with no change in body composition, suggesting a metabolic training effect on muscle. These data support a role for targeted physical rehabilitation services in this group at high risk of diabetes and cardiovascular disease.

Discontinuing long-term GH replacement therapy--a randomized, placebo-controlled crossover trial in adult GH deficiency

CONTEXT

Adult GH deficiency (GHD) is associated with impaired quality of life (QoL) and increased cardiovascular risk. Continued long-term efficacy in terms of QoL and cardiovascular risk factors has been indicated in open surveillance studies.

OBJECTIVES

The aim was to study the impact of discontinuation of long-term GH replacement on QoL, body composition, and metabolism.

DESIGN AND SETTING

We conducted a randomized, double-blind, placebo-controlled 4-month crossover trial in a referral center.

PATIENTS

Sixty adult hypopituitary patients with GHD and more than 3 yr of continuous GH replacement therapy (mean treatment duration, 10 yr) participated in the study.

INTERVENTION

Patients received GH or placebo.

MAIN OUTCOME MEASUREMENTS

We measured QoL using validated questionnaires; body composition using computer tomography, dual-energy x-ray absorptiometry, and bioelectrical impedance spectroscopy; and insulin sensitivity using the short insulin tolerance test.

RESULTS

Mean serum IGF-I decreased from 168 ± 52 to 98 ± 47 μg/liter during the placebo period (P < 0.001). Two QoL domains (emotional reactions and positive well-being) in the Nottingham Health Profile and Psychological General Well-Being questionnaires deteriorated during placebo, compared with GH treatment (P < 0.05). Waist circumference and sc and visceral fat mass increased, and extracellular water and muscle area decreased during the placebo period (all P < 0.05). C-reactive protein and total-, low-density lipoprotein-, and high-density lipoprotein-cholesterol increased, and insulin sensitivity improved during placebo, compared to GH treatment (P < 0.05).

CONCLUSION

After more than 3 yr of GH replacement therapy, a 4-month period of placebo treatment caused self-perceived deterioration in QoL and increased abdominal fat accumulation. Moreover, markers of systemic inflammation and lipid status deteriorated, whereas insulin sensitivity improved. Long-term continuous GH replacement is needed to maintain therapeutic effects of GH on QoL and cardiovascular risk factors.

Quality of life is decreased in female patients treated for microprolactinoma

OBJECTIVE

Most studies on treatment of microprolactinoma have focused on clinical and biochemical outcome rather than on functional and mental well-being. We evaluated this topic in female patients with microprolactinoma, because other pituitary adenomas are associated with decreased quality of life.

DESIGN

We conducted a cross-sectional study.

PATIENTS AND METHODS

To assess the impact of treatment for microprolactinoma on subjective well-being, quality of life was investigated in 55 female patients (mean age 45 +/- 10 years), treated for microprolactinoma in our center, using four validated, health-related questionnaires: Short-Form-36 (SF-36), Nottingham Health Profile (NHP), Multidimensional Fatigue Inventory (MFI-20), and Hospital Anxiety and Depression Scale (HADS). Patient outcomes were compared with those of 183 female controls with equal age distributions.

RESULTS

Anxiety and depression scores were increased when compared with controls for all subscales as measured by HADS, and fatigue for all but one subscale as measured by MFI-20. Patients treated for microprolactinoma had worse scores on social functioning, role limitations due to physical problems (SF-36), energy, emotional reaction, and social isolation (NHP) when compared with control subjects. Important independent predictors of quality of life were reproductive status and anxiety and depression scores according to the HADS.

CONCLUSION

Quality of life is impaired in female patients treated for microprolactinoma, especially due to increased anxiety and depression. These increased anxious and depressive feelings might be due to possible effects of hyperprolactinemia on the central nervous system. Failure to recognize this association may adversely affect patient-doctor relationships.

Quality of life and psychiatric sequelae following aneurysmal subarachnoid haemorrhage: does neuroendocrine dysfunction play a role?

OBJECTIVE

Patients who have sustained aneurysmal subarachnoid haemorrhage (SAH) often suffer persistent impairments in their quality of life (QoL) and psychological disturbances despite a good neurological outcome. In the light of the high prevalence of partial hypopituitarism in SAH survivors demonstrated in recent investigations, we aimed to determine whether neuroendocrine dysfunction has an impact on QoL and neurobehavioural symptoms in these patients.

DESIGN/PATIENTS

QoL, depression and psychological distress were assessed in 40 SAH survivors who had undergone endocrine function testing at least 1 year after the haemorrhage.

MEASUREMENTS

QoL was assessed using the Nottingham Health Profile (NHP), the Quality of Life Assessment of Growth Hormone Deficiency in Adults (QoL-AGHDA) and the Short Form-36 questionnaire (SF-36). The Beck Depression Inventory (BDI) and the Impact of Event Scale (IES) were used to evaluate depression and symptoms of current subjective distress in response to the SAH as a stressful life event, respectively.

RESULTS

In a stepwise multiple regression analysis, basal cortisol level was included as the first and often only predictor for several QoL domains assessing psychological aspects of well-being and depression whereas physical aspects of QoL were predicted primarily by neurological recovery from the SAH. Severe GH deficiency (GHD) was the first predictor for the criterion NHP subscale 'Energy' and highest stimulated ACTH level in the insulin tolerance test (ITT) was the first predictor for disturbed sleep as assessed with the NHP subscale 'Sleep'.

CONCLUSION

Our results provide preliminary data that neuroendocrine disturbances contribute to disturbed QoL, depression and sleeping disturbances in SAH patients.

Preliminary development of the new individualized HDQoL questionnaire measuring quality of life in adult hypopituitarism

OBJECTIVES

The objectives were (1) to report the preliminary development of the Hormone Deficiency-dependent Quality of Life (HDQoL) questionnaire, a new individualized questionnaire in which respondents rate personally applicable domains for importance and impact of hormonal deficiency and its treatment; (2) to evaluate the HDQoL's psychometric properties for adults with hypopituitarism including growth hormone deficiency (GHD).

METHODS

Internal consistency reliability, aspects of validity, and sensitivity to change of the HDQoL were investigated in: (1) a cross-sectional survey of 157 adults with treated or untreated GHD; (2) a randomized, placebo-controlled study of 3 months' growth hormone (GH) withdrawal from 12 of 21 GH-treated adults.

RESULTS

Thirteen of the original 18 HDQoL domains were relevant and important for GH-deficient adults. The shorter 13-item HDQoL had excellent internal reliability (Cronbach's alpha coefficient = 0.914, n = 109), and was sensitive to sex differences (cross-sectional study): women perceived worse present QoL than men [t(149.8) = 2.33, P = 0.021]. The HDQoL was sensitive to change (GH-withdrawal study) with a significant between-group difference in change in domain scores for things I can do physically[t(16) = 2.47, P = 0.025, 2-tailed], patients withdrawn from GH reporting greater negative impact of hormone deficiency on this domain at end-point. Qualitative work resulted in the addition of seven new HDQoL domains, including energy and bodily pain.

CONCLUSION

The HDQoL, although at an early stage of development, proved useful in identifying expected changes following GH withdrawal. The extended 20-item version is recommended for further evaluation in assessing the impact of hypopituitarism on QoL.

Psychometric properties of two measures of psychological well-being in adult growth hormone deficiency

Background

Psychometric properties of two measures of psychological well-being were evaluated for adults with growth hormone deficiency (GHD): the General Well-being Index, (GWBI) – British version of the Psychological General Well-being Index, and the 12-item Well-being Questionnaire (W-BQ12).

Methods

Reliability, structure and other aspects of validity were investigated in a cross-sectional study of 157 adults with treated or untreated GHD, and sensitivity to change in a randomised placebo-controlled study of three months' growth hormone (GH) withdrawal from 12 of 21 GH-treated adults.

Results

Very high completion rates were evidence that both questionnaires were acceptable to respondents. Factor analyses did not indicate the existence of useful GWBI subscales, but confirmed the validity of calculating a GWBI Total score. However, very high internal consistency reliability (Cronbach's alpha = 0.96, N = 152), probably indicated some item redundancy in the 22-item GWBI. On the other hand, factor analyses confirmed the validity of the three W-BQ12 subscales of Negative Well-being, Energy, and Positive Well-being, each having excellent internal reliability (alphas of 0.86, 0.86 and 0.88, respectively, N from 152 to 154). There was no sign of item redundancy in the highly acceptable Cronbach's alpha of 0.93 (N = 148) for the whole W-BQ12 scale. Whilst neither questionnaire found significant differences between GH-treated and non-GH-treated patients, there were correlations (for GH-treated patients) with duration of GH treatment for GWBI Total (r = -0.36, p = 0.001, N = 85), W-BQ12 Total (r = 0.35, p = 0.001, N = 88) and for all W-BQ12 subscales: thus the longer the duration of GH treatment (ranging from 0.5 to 10 years), the better the well-being. Both questionnaires found that men had significantly better overall well-being than women. The W-BQ12 was more sensitive to change than the GWBI in the GH-Withdrawal study. A significant between-group difference in change in W-BQ12 Energy scores was found [t(18) = 3.25, p = 0.004, 2-tailed]: patients withdrawn from GH had reduced energy at end-point. The GWBI found no significant change.

Conclusion

The W-BQ12 is recommended in preference to the GWBI to measure well-being in adult GHD: it is considerably shorter, has three useful subscales, and has greater sensitivity to change.

Which instrument is more suitable to assess health-related quality of life: Nottingham Health Profile or Short-Form-36?

BACKGROUND

Recent publications in rehabilitation research describe a new category of outcome measures, so-called patient-reported outcomes (PROs). This is an umbrella term for different degrees of subjective symptom intensity, treatment satisfaction and, particularly, health-related quality of life (HrQoL). Given the countless new developments in the field of HrQoL, it has become difficult to select the most appropriate or the best instrument for outcome-oriented studies. We evaluated and compared the two most frequently used questionnaires to assess HrQoL, namely the Nottingham Health Profile (NHP) and the MOS Short-Form-36 Health Survey (SF-36) with regard to their applicability in gerontology.

METHODS

A sample of active "elderly gymnasts" (mean age, 68 years) was compared with a "young" control group (mean age, 36 years). Both groups were asked to fill out the two questionnaires and enter on a visual analogue scale (VAS) their assessment of the suitability of each instrument for application in a scientific study.

RESULTS

While the control group generally favoured the SF-36 and rated this questionnaire significantly better than the NHP, the two survey instruments were given nearly the same rating by the elderly gymnasts. Younger experimental subjects particularly objected to the wording of the items (all of these were found to be negatively oriented) and the dichotomous response format of the NHP (it allows only yes-no answers in contrast to the SF-36 which offers several graded choices) while elderly patients considered this limited range of responses to be an advantage of the NHP.

CONCLUSIONS

The decision in favour of or against a survey instrument should always be made individually for each situation, based on the test criteria and the characteristics of the study population. In elderly patients with stronger symptoms, one may well decide in favour of the NHP despite its disadvantages (limited response format, floor effects, less frequent use of the questionnaire).

Decreased quality of life in patients with acromegaly despite long-term cure of growth hormone excess

The long-term impact of acromegaly on subjective well-being after treatment of GH excess is unclear. Therefore, we evaluated quality of life by validated questionnaires in a cross-sectional study of 118 successfully treated acromegalic patients. The initial treatment was transsphenoidal surgery in most patients (92%), if necessary followed by radiotherapy or octreotide. All patients were in remission at the time of assessment (GH, <1.9 mug/liter; normal IGF-I for age). General perceived well-being was reduced compared with controls for all subscales (P < 0.001) as measured by the Nottingham Health Profile and the Short Form-36. Acromegalic patients also had lower scores on fatigue (Multidimensional Fatigue Index) and anxiety and depression (Hospital Anxiety and Depression Scale). Radiotherapy was associated with decreased quality of life in all subscales except for the Hospital Anxiety and Depression Scale, and worsened quality of life significantly, according to the fatigue scores. Somatostatin analog treatment was not associated with improved quality of life. Independent predictors of quality of life were age (physical subscales and Nottingham Health Profile), disease duration (social isolation and personal relations), and radiotherapy (physical and fatigue subscales). In conclusion, patients cured after treatment for acromegaly have a persistently decreased quality of life despite long-term biochemical cure of GH excess. Radiotherapy especially is associated with a reduced quality of life.

Psychological effects of withdrawal of growth hormone therapy from adults with growth hormone deficiency

OBJECTIVE

Growth hormone (GH) is known to be required for physical well-being. Although it is also widely believed to be important for quality of life (QoL) and psychological health, there is less supportive evidence. The objective of this study was to investigate the psychological effects of discontinuation of GH replacement from adults with severe GH deficiency (GHD).

DESIGN

A double-blind, placebo-controlled trial in which GH replacement therapy was discontinued for 3 months from 12 of 21 GH-deficient adults, where nine continued with GH replacement.

PATIENTS

GH-treated adults (10 men, 11 women), all with severe GHD (peak GH < 7.7 mU/l on provocative testing), mean age 44.9 years (range 25-68 years).

MEASUREMENTS

Semi-structured interviews were given at baseline and end-point plus questionnaires that included a new hormone-deficiency specific, individualized, QoL questionnaire (HDQoL), the General Well-being Index (GWBI), the Well-being Questionnaire (W-BQ12), the Short-Form 36 health status questionnaire (SF-36), the Nottingham Health Profile (NHP) and the General Health Questionnaire (GHQ).

RESULTS

Three months after baseline the serum total IGF-I of placebo-treated patients fell from normal, age-related levels (mean 26.6 +/- 13.2 nmol/l) to levels indicative of severe GHD (11.6 +/- 6.6 nmol/l) (P<0.001). Psychological symptoms of GH withdrawal, reported in interviews at end-point by placebo-treated patients, included decreased energy, and increased tiredness, pain, irritability and depression. Patients who believed they knew which treatment they had received correctly identified the treatment (GH or placebo) at end-point (chi2=11.25, P<0.01). Significant between-treatment-group differences in change scores were found for SF-36 General Health (P<0.01), W-BQ12 Energy (P<0.01) and HDQoL do physically (P<0.05), indicating reduced general health, reduced energy and greater perceived impact of hormone deficiency on physical capabilities in the placebo-treated group at end-point relative to GH-treated patients.

CONCLUSION

Withdrawal of GH treatment from adults with severe GH deficiency has detrimental psychological effects.