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OBJECTIVES: Colorado issued a month long statewide lockdown on March 26, 2020, during the initial surge of the COVID-19 pandemic. The impact of this mandate on non–COVID-19 ICU admission rates and outcomes is unclear. DESIGN: We performed a retrospective analysis of all medical ICU admissions in the University of Colorado Health System in four predefined periods: 1) prepandemic (2 mo prior to lockdown period 1); 2) mandated lockdown from March 26 to April 26, 2020 (period 2); 3) between surges (period 3); and 4) nonmandated lockdown surge (between November 1, 2020, and March 31, 2021, period 4). SETTING: Nonsurgical ICU admissions at the University of Colorado Health Systems, including 10 hospitals throughout Colorado. SUBJECTS: All ICU admissions in four predefined time periods. MEASUREMENTS AND MAIN RESULTS: We included 13,787 patients who were admitted during the four study periods. The 28-day mortality rates for non–COVID-19 ICU admissions following index ICU admission were 13.6%, 18.0%, 13.5%, and 16.0% across periods 1–4, respectively. However, the increased odds in non–COVID-19 ICU mortality during the mandated lockdown period relative to prepandemic 1 (odds ratio [OR], 1.39; 95% CI, 1.11–1.72; p = 0.0.04) was attenuated and nonsignificant after adjustment for demographics, comorbidities, diagnosis flags, and severity (OR, 1.15; 95% CI, 0.89–1.48; p = 0.27). Similar results were found in time-to-event analyses. The most common diagnosis in each time period was acute respiratory failure (ARF), and we found it to have increased during lockdown (p < 0.001), whereas sepsis admissions increased during and decreased after lockdown (p = 0.004). Admissions for alcohol withdrawal syndrome (AWS) increased during lockdown and 6 months afterwards (p = 0.005). CONCLUSIONS: For non-COVID-19–related ICU admissions, mortality rate was similar before, during, and after Colorado’s month long lockdown after confounder adjustment, including typical ICU admission flags. Primary admission diagnoses shifted throughout the predefined study periods with more admissions for severe critical diagnoses (i.e., ARF, sepsis, AWS) occurring during the mandated lockdown and nonmandated lockdown periods compared with the prepandemic and between surge period. This would suggest that the perceived increase in mortality during the lockdown for non–COVID-19 ICU admissions may be related to a shift inpatient demographics.

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A 62-year-old woman with a history of partially treated Graves disease and hypertension presented with approximately 3 weeks of worsening fatigue, lower extremity myalgias, and shortness of breath. Her medical history included a thyroid radiofrequency ablation several years earlier. Following the ablation, she was found to have some residual thyroid activity, negating the need for therapy. She was lost to follow-up after months of normal thyroid-stimulating hormone values. On this presentation, the patient was noted to be in atrial fibrillation with a rapid ventricular rate, and although she presented alert and oriented initially, she developed progressive inattentiveness and confusion while in the ED. The patient was transferred to the medical ICU for further management of her rapid heart rate and progressive delirium.