Continuous glucose monitoring systems reduce hypoglycemia incidence and severity across type 1 diabetes populations, yet evidence remains limited regarding impaired awareness of hypoglycemia restoration—particularly among older adults at highest complication risk. The WISDM study provides prospective data evaluating CGM impact on hypoglycemia perception over 52 weeks in this vulnerable cohort. 
This post-hoc analysis published in the Diabetes Care stratified participants by Clarke survey scores at baseline, 26 weeks (n=184), and 52 weeks (n=94), decomposing the composite Clarke-full score into Hypoglycemia Awareness Factor (HAF) assessing symptom recognition deficits and Severe Hypoglycemia Experienced Factors (SHEF) capturing prior severe event history. Investigators examined longitudinal trajectories across full cohort and impaired awareness of hypoglycemia subgroups, highlighting measurement instrument sensitivity to intervention effects.
SHEF Domain Shows Robust CGM Response
Both 26-week and 52-week assessments revealed statistically significant Clarke-SHEF reductions (P=0.02 and P<0.0001, respectively), reflecting diminished severe hypoglycemia exposure history. This domain improvement occurred independently of baseline awareness status, confirming CGM effectiveness in mitigating recurrent life-threatening events through proactive alerting.
Composite and Awareness Scores Demonstrate Heterogeneity
Clarke-full and Clarke-HAF scores remained statistically stable across timepoints in the overall cohort, underscoring limited sensitivity to detect subtle symptom recognition gains. However, within the baseline impaired awareness subgroup, Clarke-full scores improved significantly by 52 weeks while HAF remained unchanged, revealing domain-specific responsiveness patterns.
Clarke Limitations Warrant Instrument Refinement
Differential subscale performance highlights Clarke survey limitations for longitudinal CGM trials, where SHEF captures exposure reduction but HAF proves insufficiently granular for awareness restoration phenotyping. These findings challenge assumptions of uniform score responsiveness in older adults with longstanding type 1 diabetes.
Clinical Guidance for High-Risk Older Adults
Endocrinologists managing geriatric type 1 diabetes should prioritize CGM implementation for severe hypoglycemia prevention, recognizing variable impaired awareness recovery detectable only through composite scoring. Adjunctive behavioral interventions and prospective symptom inventory development may enhance awareness restoration beyond technological alerting alone. Serial Clarke assessments remain valuable for risk stratification despite measurement constraints.