Baroreflex Loading Reveals Exaggerated Ventilatory Inhibition in Patients With Parkinson's Disease

Q: What is the clinical evidence from this study?

Study design: Observational. Population: Parkinson's disease (n=17). Intervention: Parkinson's disease vs. Healthy age-matched controls. Primary outcome: Overall pressure-ventilation slope across the modified-Oxford technique (p=0.203).

Jhenny V. Neri; Jeann L. Sabino‐Carvalho; Bruno M. Silva; Pedro Renato de Paula Brandão; Fabrício da Silva; Paul J. Fadel; Lauro Casqueiro Vianna

doi:10.1111/apha.70323

October 4, 2026Acta PhysiologicaOpen Access

Baroreflex Loading Reveals Exaggerated Ventilatory Inhibition in Patients With Parkinson's Disease

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Key result

Parkinson's disease linked to exaggerated ventilatory inhibition during baroreflex loading vs healthy controls.

P=0.203
n=17

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Why the study?

Does baroreflex loading alter ventilatory inhibition in patients with Parkinson's disease compared to healthy controls?

Key Points

To evaluate whether baroreflex-mediated ventilatory responses to transient blood pressure changes are altered in patients with Parkinson's disease.
Retrospective analysis of cardiovascular and ventilatory recordings in 8 patients with idiopathic Parkinson's disease (age 50 ± 5 years) and 9 age-matched controls (age 50 ± 6 years).
Participants underwent the modified-Oxford technique using sequential intravenous boluses of sodium nitroprusside and phenylephrine while respiratory rate and amplitude were tracked via pneumobelt.
At rest, patients with Parkinson's disease showed a significantly higher breathing rate (19.4 ± 1.3 vs. 13.6 ± 1.1 breaths·min−1) and shorter total respiratory cycle times (3.2 ± 0.2 vs. 4.8 ± 0.4 s; p = 0.008).
Phenylephrine-induced baroreflex loading caused a significantly steeper pressure–ventilation slope and markedly exaggerated ventilatory inhibition in Parkinson's disease compared to controls despite similar blood pressure increases.
Pressure–ventilation slopes did not differ significantly during nitroprusside unloading (controls: −0.44 ± 0.060 vs. Parkinson's: −0.83 ± 0.266; p = 0.197) or across the entire maneuver (controls: −0.55 ± 0.146 vs. Parkinson's: −0.94 ± 0.264; p = 0.203).

Study Design

Type

Observational (n=17)

Multicenter

Yes

Structured PICO

Does baroreflex loading alter ventilatory inhibition in patients with Parkinson's disease compared to healthy controls?

P

Population

17 middle-aged participants (8 with idiopathic Parkinson's disease and 9 age-matched healthy controls) underwent retrospective analysis of baro-ventilatory responses during the modified-Oxford technique.

E

Exposure

Modified-Oxford technique utilizing nitroprusside infusion for baroreflex unloading followed by phenylephrine infusion for baroreflex loading

C

Comparator

Age-matched controls without Parkinson's disease undergoing the same modified-Oxford technique

O

Outcome

Ventilatory inhibition and pressure–ventilation relationship slopes during baroreflex loading and unloadingsurrogate

Main Result

Absolute Event Rate: -0.94% vs -0.55%

p-value: p=0.203

Patients with Parkinson's disease exhibit exaggerated ventilatory inhibition in response to baroreflex loading, providing evidence of altered baro-ventilatory integration in this population.

Limitations

Small sample size
Ongoing levodopa treatment in patients
Ventilation was estimated from pneumobelt-derived respiratory rate and amplitude rather than measured directly
Retrospective secondary analysis of studies with different primary aims
small sample size
ongoing levodopa treatment
ventilation was estimated from pneumobelt-derived respiratory rate and amplitude rather than measured directly

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Implication

May indicate autonomic dysregulation in Parkinson's disease; leaves open diagnostic or prognostic utility pending larger studies.

Abstract

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Cite This Study

Neri et al. (2026) conducted an observational in Parkinson's disease (n=17). Parkinson's disease vs. Healthy age-matched controls was evaluated on Overall pressure-ventilation slope across the modified-Oxford technique (p=0.203). Patients with Parkinson's disease exhibited exaggerated ventilatory inhibition during baroreflex loading, demonstrating a significantly steeper pressure-ventilation slope compared to healthy controls.

synapsesocial.com/papers/6ac5a1af164a9ca62de5b350 https://doi.org/10.1111/apha.70323

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Baroreflex Loading Reveals Exaggerated Ventilatory Inhibition in Patients With Parkinson's Disease

Figures

Key Points

Study Design

Structured PICO

Main Result

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Baroreflex Loading Reveals Exaggerated Ventilatory Inhibition in Patients With Parkinson's Disease

Figures

Key Points

Study Design

Structured PICO

Main Result

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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