Abstract
Objective This study aimed to investigate the ability of the immune system
assessment questionnaire (ISAQ) to predict adrenal crisis (AC) and infectious
events in patients with primary adrenal insufficiency (PAI).
Design This was a prospective single-centre study over three years.
Methods Patients answered the ISAQ at baseline and were seen every
4–6 months in the endocrine outpatient clinic. At each visit previous
infectious periods which required an increase in daily glucocorticoid dosage and
AC were reported and documented. Seventy-five patients with PAI (53 women; 43
patients with autoimmune PAI, 20 patients with salt-wasting congenital adrenal
hyperplasia and 12 patients who underwent bilateral adrenalectomy) were
analysed. Due to the COVID-19 pandemic and consecutive lockdown measures, the
data were analysed separately for March 2018 to March 2020 (period 1), and March
2020 to March 2021 (period 2).
Results During period 1 the ISAQ score significantly correlated with the
number of reported infectious events (r=0.351; p<0.01), but not
during period 2 (r=0.059, p=0.613), in which the number of
infectious events per patient-year significantly decreased (1.1±0.1 vs
0.4±0.1; p<0.001). The frequency of AC decreased from 8.8 to 2.4
per 100 patient-years between the two study periods. The ISAQ score was not
different between patients with or without AC.
Conclusions The ISAQ score does not identify patients prone to ACs. The
COVID-19 pandemic and consecutive lockdown measures significantly diminished the
frequency of infectious events and ACs.
Key words
Addison’s disease - ISAQ score - AddiQoL - adrenal crisis - COVID-19 - congenital adrenal hyperplasia