Novel treatments for congenital adrenal hyperplasia

Patients with classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency (21OHD) need life-long medical treatment to replace the lacking glucocorticoids and potentially lacking mineralocorticoids and to lower elevated adrenal androgens. Long-term complications are common, including gonadal dysfunction, infertility, and cardiovascular and metabolic co-morbidity with reduced quality of life. These complications can be attributed to the exposure of supraphysiological dosages of glucocorticoids and the longstanding exposure to elevated adrenal androgens. Development of novel therapies is necessary to address the chronic glucocorticoid overexposure, lack of circadian rhythm in glucocorticoid replacement, and inefficient glucocorticoid delivery with concomitant periods of hyperandrogenism. In this review we aim to give an overview about the current treatment regimens and its limitations and describe novel therapies especially evaluated for 21OHD patients.

Dual-release hydrocortisone and its benefits on cognitive function and quality of sleep

PURPOSE

Patients with adrenal insufficiency are usually treated with conventional hydrocortisone replacement therapy which fails to mimic the circadian rhythm of cortisol secretion. Dual-release hydrocortisone (DR-HC) resembles the daily normal cortisol profile improving metabolic parameters and quality of life. However, currently little is known about its impact on cognitive function. Aim of this study was to evaluate cognitive function and well-being in DR-HC treated patients compared to healthy controls and conventional HC treatment.

METHODS

Twenty adults with adrenal insufficiency treated with DR-HC (Plenadren®) underwent 10 neuropsychological tests, evaluating cognitive functions. Furthermore, demographic data, quality of life, symptoms of depression, and quality of sleep were evaluated by well-established questionnaires. Patients were compared by diagnosis (PAI/SAI) and dose (≥20 mg). In addition, eighteen DR-HC treated adults were compared to eighteen matched conventionally treated adults.

RESULTS

With respect to diagnosis patients with PAI performed significantly better on intellectual abilities (p = 0.038) and on executive functioning (p = 0.026) and reported a significant longer time to fall asleep (p = 0.026). Regarding DR-HC dosage, there were no significant differences in cognitive functions. Patients on high dose reported a better subjective quality of sleep (p = 0.028) than patients on low dose. In comparison to conventional HC treatment, patients with DR-HC tended to show better results in executive functioning (p = 0.099).

CONCLUSION

Patients with PAI reached better results in several cognitive functions and had a worse quality of sleep than patients with SAI. Our data suggest a positive impact of DR-HC on quality of sleep. DR-HC may be better for executive functioning.

Micro- and macrovascular function in patients suffering from primary adrenal insufficiency: a cross-sectional case-control study

BACKGROUND

Despite adequate glucocorticoid (GC) and mineralocorticoid (MC) replacement therapy, patients suffering from primary adrenal insufficiency (AI) have an increased mortality, mainly due to cardiovascular diseases. Only little knowledge exists on the contribution of MC substitution to the cardiovascular risk. Therefore, this study investigates the impact of plasma renin concentration on parameters of micro- and macrovascular function.

METHODS

26 patients with primary AI [female = 18, age: 51 (28; 78) years; BMI: 24 (18; 40) kg/m²; disease duration: 18 (5; 36) years] were included in this cross-sectional analysis. Intima media thickness (IMT) and pulse wave velocity (PWV) were investigated to assess macrovascular remodeling and arterial stiffness. Microvascular function was estimated by post-occlusive reactive hyperemia using laser Doppler fluxmetry. Baseline perfusion, biological zero, peak perfusion, time to peak and recovery time were recorded. Patients were grouped according to their median plasma renin concentration of previous visits (Renin_high vs Renin_low) and were compared to a group of healthy women [age: 44 (43; 46) years; BMI: 24.2 (21.8; 27.5)].

RESULTS

PWV was significantly higher in AI patients compared to controls [9.9 (5; 18.5) vs 7.3 (6.8; 7.7) m/s; p < .01], whereas no differences in microvascular function could be found. In Renin_low time to peak perfusion was significantly longer [6.0 (3; 15) vs 3.5 (1.5; 11) s; p < .05], whereas no differences in IMT and PWV were observed between Renin_high and Renin_low. No impact of GC dose was observed.

CONCLUSIONS

Microvascular function is not impaired in patients with primary AI under adequate replacement therapy, although higher renin concentrations are associated with subclinical improvements. No relation between RAAS activity and macrovascular function is observed, while arterial stiffness might be increased in primary AI.

Plasma renin levels are associated with cardiac function in primary adrenal insufficiency

BACKGROUND

Despite adequate glucocorticoid (GC) and mineralocorticoid (MC) replacement therapy, primary adrenal insufficiency (AI) is associated with an increased mortality, mainly due to cardiovascular disease. The role of MC replacement is not known. Therefore, we assessed whether renin concentrations during routine GC and MC substitution therapy are associated with heart function and morphology.

METHODS

Thirty two patients with primary AI were included in a cross-sectional case-control study. In total, 17 patients and 34 healthy controls (age: 48 ± 12 vs. 46 ± 18 years; BMI: 23 ± 3 vs. 24 ± 3 kg/m2) underwent magnetic resonance spectroscopy and imaging measurements to assess cardiac function, morphology, ectopic lipids, and visceral/subcutaneous fat mass. Patients were divided according to their actual plasma renin concentration at the study visit (Actual-Reninlow vs. Actual-Reninhigh) and their median plasma renin concentration of previous visits (Median-Reninlow vs. Median-Reninhigh).

RESULTS

Ejection fraction was higher (67 ± 5 vs. 55 ± 3%; p = 0.001) and left ventricular mass was lower (60 ± 9 vs. 73 ± 10 g/m2; p = 0.025) in Actual-Reninhigh. Median-Reninhigh was associated with lower cardiac mass (64 ± 9 vs. 76 ± 11 g/m2; p = 0.029). Blood pressure, glucose, and lipid metabolism, as well as ectopic lipid content, pericardial fat mass, and visceral/subcutaneous fat were not different between the groups. Compared with controls, ejection fraction was significantly lower in patients with AI (56 ± 4 vs. 63 ± 8%; p = 0.019). No differences were found in patients with ≤20 mg compared with >20 mg of hydrocortisone per day.

CONCLUSIONS

Higher renin concentrations are associated with more favorable cardiac function and morphology in patients with primary AI.

Usage of continuous glucose monitoring (CGM) for detecting an unrecognized hypoglycemia and management of glucocorticoid replacement therapy in adult patients with central hypoadrenalism

Patients with adrenal insufficiency require appropriate glucocorticoid replacement therapy; however, reliable biological parameters for optimizing glucocorticoid supplementation are limited. The physician has to rely primarily on clinical judgment, carefully taking into account signs and symptoms potentially suggestive of over- or under-replacement. We have found that some patients who are viewed as receiving sufficient doses of glucocorticoids occasionally exhibit morning headache or morning discomfort, which may be caused by unrecognized nocturnal hypoglycemia. Our aim in this study was to evaluate the usefulness of continuous glucose monitoring (CGM) for detecting unrecognized hypoglycemia and optimizing glucocorticoid replacement therapy in adult patients with central hypoadrenalism. Six patients with central hypoadrenalism of various etiologies were included in this study. All patients exhibited occasional morning headache or discomfort. We performed CGM to measure plasma glucose levels in all patients, and CGM identified unrecognized hypoglycemia episodes at midnight and early in the morning in five patients (83%). The CGM findings were used to fine-tune the dosing and regimens of glucocorticoid replacement and to re-evaluate glucose levels to avoid further unrecognized hypoglycemic events. This optimization of hydrocortisone supplementation prevented additional nocturnal hypoglycemia incidences in all cases. The addition of L-thyroxine with hydrocortisone continued to provide favorable glycemic control. Occasional symptoms also improved after maintenance in all patients. These findings demonstrated that CGM may represent a powerful tool for identifying unrecognized hypoglycemia and for optimizing supplementary hormones in patients with central hypoadrenalism, thereby improving their quality of life.

Self-management in adrenal insufficiency - towards a better understanding

Patients with adrenal insufficiency (AI) require life-long glucocorticoid (GC) replacement treatment and dose adjustment in stress situations to prevent life-threatening adrenal crises. Herein this study we evaluated the patients' healthcare situation and their knowledge on AI, comparing various aspects to a prior survey in 209 physicians. Using a questionnaire, we conducted a comprehensive survey among 33 AI patients who were treated at the endocrine outpatient clinics of two University Hospitals in Germany. The majority of AI patients (97%) named their treating physician as main source for information. Overall, 89.7% of interviewees were satisfied with their medical treatment; however, about 1/3 reported controversies with healthcare professionals regarding GC replacement in various situation. Two thirds of AI patients increased their substitution dose temporarily within the last 12 months. However, not all patients had an emergency ID, and only 64.5% an emergency kit. None of the interviewed patients identified the need for adjustment in all given situations correctly. Almost 80% of patients did not correctly identify all symptoms of GC over- and under-replacement. Interestingly, we found no significant differences between patients and physicians regarding specific aspects of GC replacement. We showed that: (i) AI patients have some knowledge gaps on modalities and adequacy of GC replacement therapy; (ii) long-term management of patients with AI remains a challenge requiring an experienced specialist; and (iii) further education of physicians as primary source of information is necessary. Additional education may help AI patients to empower them to adequate self-treatment.

Self-perceived health status of patients with adrenal insufficiency receiving glucocorticoid replacement therapy - French data from a worldwide patient survey

An international survey was undertaken to investigate current practices in glucocorticoid replacement therapy and self-perceived health status of patients with adrenal insufficiency, using a 39-item questionnaire. Results were published in 2012. We analyzed data from French patients, extracted from the database. Participants were recruited via a patient advocacy group to respond anonymously to a questionnaire developed by clinical experts. Ninety-four patients participated (primary adrenal insufficiency 79% and secondary adrenal insufficiency 16%). They were treated mainly with hydrocortisone (97.5%). Dosing regimens were once daily (8%), twice daily (38%), thrice daily (30%) or other (24%). Nearly 80% of the participants considered their affection to have an impact on their physical activity, work, family or social life and 38% reported absence from work/school in the last 3 months. Fatigue in the morning or during the day was a problem for 57% and 69% of respondents respectively. Eighty percent were concerned about long-term side effects of therapy, mainly osteoporosis (79%), fatigue (57%) and obesity (43%). Despite obvious biases in the survey, we should be alerted by the high number of patients' complaints and the clear signs of quality of life impairment in this population, and think about strategies to improve their management.