Reevaluating No-Flow Time in Elderly Patients Experiencing Out-of-Hospital Cardiac Arrest

By
Yohei Okada
September 1, 2026

Jama Network Open

Background

As the global population ages, out-of-hospital cardiac arrest (OHCA) is increasingly prevalent among older adults, who represent the majority of cases in developed countries. Advanced age has been consistently linked to poorer survival and neurological recovery outcomes.

Data Highlights

Age Group	No-Flow Duration (minutes)	95% Confidence Interval
65-74 years	14	14-14
75-84 years	11	10-11
85-94 years	2	0-4
95 years or older	0	0-0

Key Findings

Advanced age is associated with a significant reduction in the no-flow duration that corresponds to a favorable neurological outcome.
No-flow duration thresholds were identified as 14 minutes for ages 65-74, 11 minutes for 75-84, 2 minutes for 85-94, and 0 minutes for 95 and older.
The study utilized age-specific dynamic probability curves to assess neurological recovery probabilities across varying no-flow durations.
Measurement errors in no-flow duration may affect the precision of outcomes, as the timing relies on witness recall and EMS documentation.
Current guidelines emphasize the importance of minimizing no-flow time to improve survival rates in OHCA patients.

Clinical Implications

Clinicians should consider age-specific no-flow duration thresholds when making resuscitation decisions for older patients experiencing OHCA. Understanding the dynamic probabilities of neurological recovery can aid in evaluating the potential benefits of continuing resuscitation efforts.

Conclusion

The findings highlight the critical need for age-specific considerations in resuscitation protocols for older adults experiencing OHCA, particularly regarding no-flow duration and its impact on neurological outcomes.