What is the clinical evidence from this study?

Study design: Observational. Population: Obstructive sleep apnea (n=34). Intervention: Obstructive apnea events vs. Baseline (nonapnea) minutes. Primary outcome: Heart rate change (MD -2.66, 95% CI -2.92 to -2.41, p=< 0.001).

What question did this study set out to answer?

To determine if ECG-derived autonomic features distinguish apnea from nonapnea events and how they change before event onset.

July 2, 2026Clinical Physiology and Functional Imaging

Obstructive apnea events linked to a ~3 bpm heart rate reduction and increased RMSSD.

Q: What are the key findings of this study?

Obstructive apnea events were associated with a minute-level heart rate reduction of -2.66 bpm (95% CI -2.92 to -2.41; p<0.001) and increased RMSSD compared to baseline minutes.

Q: What question did this study set out to answer?

To determine if ECG-derived autonomic features distinguish apnea from nonapnea events and how they change before event onset.

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Why the study?

OSA is linked to arrhythmia and cardiovascular morbidity, but the cardiac response to individual obstructive events is incompletely characterized at minute-scale resolution.

Do ECG-derived autonomic features distinguish apnea from nonapnea minutes at minute-scale resolution?

Population

34 subjects from the PhysioNet Apnea-ECG learning set

Comparison

Apnea vs nonapnea minutes (baseline, preapnea, post-apnea)

Design

Secondary analysis of an ECG database

Key result

Obstructive apnea events were associated with a minute-level heart rate reduction of -2.66 bpm (95% CI -2.92 to -2.41; p<0.001) and increased RMSSD compared to baseline minutes.

Authors

PKPratyush Kumar KAK Abhishek PSPankti Shah

Discussion

Member takes

Overview

Apnea-linked HR reduction may aid event detection; leaves open whether features improve clinical OSA screening.

Key Points

To determine if ECG-derived autonomic features distinguish apnea from nonapnea events and how they change before event onset.
Secondary analysis of PhysioNet Apnea-ECG data with 34 subjects, mean age 47.0 ± 9.7 years.
Computed heart rate, SDNN, RMSSD, pNN50, and RR irregularity from QRS-derived RR intervals for 1-min segments.
Minutes classified as baseline, preapnea, apnea, or post-apnea; associations tested using mixed-effects regression.
Apnea minutes had a heart rate reduction of -2.66 bpm (95% CI: -2.92 to -2.41, p < 0.001) and RMSSD increase of +19 ms (95% CI: 15-23, p < 0.001) versus baseline.
In multivariable modelling, SDNN was the dominant feature (β = +0.472); RMSSD showed a sign reversal (β = -0.416) with significant collinearity.
Preapnea minutes showed directionally similar but smaller changes; post-apnea minutes showed partial normalization.

Study Design

Type

Observational (n=34)

Structured PICO

Do ECG-derived autonomic features distinguish apnea from nonapnea minutes at minute-scale resolution?

Population

34 subjects (mean age 47.0 years, 11.8% female) from the PhysioNet Apnea-ECG database analyzed for minute-level autonomic dynamics around obstructive apnea events.

Exposure

Minute-level ECG-derived autonomic feature analysis during apnea events

Comparator

Nonapnea minutes (baseline, preapnea, post-apnea)

Outcome

ECG-derived autonomic features (mean heart rate, SDNN, RMSSD, pNN50, and RR irregularity rate)surrogate

Main Result

Mean Difference: -2.66 (95% CI -2.92–-2.41)

p-value: p=< 0.001

Obstructive apnea is associated with a reproducible minute-level autonomic signature of bradycardia and increased RR variability, with detectable shifts preceding event onset.

Limitations

Findings require validation in cohorts with linked cardiovascular outcomes.
Findings require validation in cohorts with linked cardiovascular outcomes

Cite This Study

Kumar et al. (2026) conducted an observational in Obstructive sleep apnea (n=34). Obstructive apnea events vs. Baseline (nonapnea) minutes was evaluated on Heart rate change (MD -2.66, 95% CI -2.92 to -2.41, p=< 0.001). Obstructive apnea events were associated with a minute-level heart rate reduction of -2.66 bpm (95% CI -2.92 to -2.41; p<0.001) and increased RMSSD compared to baseline minutes.

synapsesocial.com/papers/6a4600a29ed1343031310bb2 https://doi.org/10.1111/cpf.70080

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July 2, 2026Clinical Physiology and Functional Imaging

Obstructive apnea events linked to a ~3 bpm heart rate reduction and increased RMSSD.

View Full Paper

Ask AI

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Why the study?

OSA is linked to arrhythmia and cardiovascular morbidity, but the cardiac response to individual obstructive events is incompletely characterized at minute-scale resolution.

Do ECG-derived autonomic features distinguish apnea from nonapnea minutes at minute-scale resolution?

Population

34 subjects from the PhysioNet Apnea-ECG learning set

Comparison

Apnea vs nonapnea minutes (baseline, preapnea, post-apnea)

Design

Secondary analysis of an ECG database

Key result

Obstructive apnea events were associated with a minute-level heart rate reduction of -2.66 bpm (95% CI -2.92 to -2.41; p<0.001) and increased RMSSD compared to baseline minutes.

Authors

PKPratyush Kumar KAK Abhishek PSPankti Shah

Discussion

Member takes

Overview

Apnea-linked HR reduction may aid event detection; leaves open whether features improve clinical OSA screening.

Key Points

To determine if ECG-derived autonomic features distinguish apnea from nonapnea events and how they change before event onset.
Secondary analysis of PhysioNet Apnea-ECG data with 34 subjects, mean age 47.0 ± 9.7 years.
Computed heart rate, SDNN, RMSSD, pNN50, and RR irregularity from QRS-derived RR intervals for 1-min segments.
Minutes classified as baseline, preapnea, apnea, or post-apnea; associations tested using mixed-effects regression.
Apnea minutes had a heart rate reduction of -2.66 bpm (95% CI: -2.92 to -2.41, p < 0.001) and RMSSD increase of +19 ms (95% CI: 15-23, p < 0.001) versus baseline.
In multivariable modelling, SDNN was the dominant feature (β = +0.472); RMSSD showed a sign reversal (β = -0.416) with significant collinearity.
Preapnea minutes showed directionally similar but smaller changes; post-apnea minutes showed partial normalization.

Study Design

Type

Observational (n=34)

Structured PICO

Do ECG-derived autonomic features distinguish apnea from nonapnea minutes at minute-scale resolution?

Population

34 subjects (mean age 47.0 years, 11.8% female) from the PhysioNet Apnea-ECG database analyzed for minute-level autonomic dynamics around obstructive apnea events.

Exposure

Minute-level ECG-derived autonomic feature analysis during apnea events

Comparator

Nonapnea minutes (baseline, preapnea, post-apnea)

Outcome

ECG-derived autonomic features (mean heart rate, SDNN, RMSSD, pNN50, and RR irregularity rate)surrogate

Main Result

Mean Difference: -2.66 (95% CI -2.92–-2.41)

p-value: p=< 0.001

Obstructive apnea is associated with a reproducible minute-level autonomic signature of bradycardia and increased RR variability, with detectable shifts preceding event onset.

Limitations

Findings require validation in cohorts with linked cardiovascular outcomes.
Findings require validation in cohorts with linked cardiovascular outcomes

Cite This Study

synapsesocial.com/papers/6a4600a29ed1343031310bb2 https://doi.org/10.1111/cpf.70080

Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

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