What is the clinical evidence from this study?

Study design: Cross-Sectional. Population: Type 1 Diabetes (n=30). Intervention: Type 1 Diabetes vs. Healthy non-diabetic controls. Primary outcome: Baseline transcutaneous tissue oxygenation (tcpO2) (p=0.034).

What does this research mean for the field?

Young adults with Type 1 diabetes exhibit reduced baseline tissue oxygenation and altered blood pressure hemodynamics during the Valsalva maneuver despite having preserved standard cardiovascular autonomic reflex functions. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

This research aims to explore the relationship between cardiovascular autonomic reflexes and microcirculatory function in young adults with type 1 diabetes.

June 2, 2026Open Access

Reduced Tissue Oxygenation and Altered Valsalva Hemodynamics in Young Adults with Type 1 Diabetes

Resultado clave

Young adults with type 1 diabetes exhibited reduced baseline transcutaneous tissue oxygenation (37.5 vs. 49.5 mmHg) and altered Valsalva hemodynamics compared to healthy controls.

Puntos clave

This research aims to explore the relationship between cardiovascular autonomic reflexes and microcirculatory function in young adults with type 1 diabetes.
Cross-sectional study with 15 adults with type 1 diabetes and 15 age-matched controls (20-40 years).
Participants underwent standardized cardiovascular autonomic reflex tests with continuous recordings of electrocardiograms and blood pressure.
Measurement of transcutaneous tissue oxygen and carbon dioxide pressures was conducted.
Individuals with type 1 diabetes had reduced baseline tissue oxygenation (37.5±3.75 mmHg) compared to controls.
During the Valsalva manoeuvre, systolic blood pressure responses were lower in individuals with type 1 diabetes in early phases I and II compared to controls.
A significant inverse association was found between early phase II diastolic response and baseline tissue oxygen levels.

Diseño del estudio

Tipo

Cross-Sectional (n=30)

Enmascaramiento

Open-label

Multicéntrico

PICO estructurado

Do young adults with Type 1 Diabetes exhibit altered microcirculatory function and cardiovascular autonomic reflexes compared to non-diabetic controls?

Población

30 young adults (20-40 years), comprising 15 with Type 1 Diabetes (T1D) and 15 age-matched non-diabetic controls.

Intervención

Standardized cardiovascular autonomic reflex tests (including the Valsalva manoeuvre) with continuous recordings of ECG, cardiac vagal tone, beat-to-beat blood pressure, and transcutaneous tissue oxygen (tcpO2) and carbon dioxide (tcpCO2).

Comparador

15 age-matched non-diabetic controls undergoing the same standardized cardiovascular autonomic reflex tests.

Resultado

Indices of microcirculatory function (baseline tcpO2) and hemodynamic responses (systolic and diastolic blood pressure) during the Valsalva manoeuvre.surrogate

Young adults with T1D exhibit reduced tissue oxygenation and altered Valsalva hemodynamics despite preserved standard autonomic reflex functions, indicating early microcirculatory changes.

Resultado numérico

Tasa de eventos absoluta: 37.5% vs 49.5%

valor p: p=0.034

Limitaciones

Limited sample size affecting generalizability
Relatively high prevalence of mild retinopathy in the cohort may introduce bias toward early-stage microvascular involvement
Lack of circulating catecholamine measurements to confirm the proposed hyperadrenergic response
Cross-sectional design prevents longitudinal assessment of autonomic dysfunction progression

Resumen

AimsCardiac autonomic neuropathy is currently an untreatable progressive complication of type 1 diabetes (T1D).Impaired microcirculation is a suspected cause of nerve degeneration in TID.We investigated whether cardiovascular autonomic reflexes often used as indices of nerve functions, are associated with indices of microcirculatory function in young adults with T1D compared with non-diabetic controls. MethodsIn a cross-sectional study, 15 adults with T1D and 15 age-matched controls (20-40 years) underwent standardized cardiovascular autonomic reflex tests.Continuous recordings of electrocardiogram, cardiac vagal tone, beat-to-beat blood pressure and transcutaneous tissue oxygen (tcpO₂) and carbon dioxide partial pressures (tcpCO 2 ) were done. ResultsDespite preserved baroreflex, parasympathetic, and sympathetic functions assessed using cardiovascular reflex tests, the individuals with T1D exhibited reduced baseline tcpO 2 compared to the controls (37.5±3.75 vs. mmHg). During theValsalva manoeuvre, individuals with T1D exhibited a reduced systolic blood pressure response in phase I (31±10 vs. 43±18 mmHg) and early phase II (-1±15 vs. -18±17 mmHg), and an increased systolic (31±15 vs. 18±14 mmHg) and diastolic (45±11 vs. 33±16 mmHg) response in late phase II compared to controls.The early phase II diastolic response was inversely associated with baseline tcpO 2 .

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