Key result
POTS is linked to splanchnic hyperemia and hypervolemia during Valsalva, driving excessive phase II BP reduction.
Why the study?
Thoracic hypovolemia and splanchnic hypervolemia characterize certain POTS patients during orthostatic stress and are associated with abnormal blood pressure responses during the Valsalva maneuver.
Does splanchnic hyperemia and hypervolemia explain aberrant blood pressure responses during the Valsalva maneuver in patients with postural tachycardia syndrome?
Population
17 POTS patients aged 15-23 years and 10 healthy volunteers
Comparison
POTS patients vs healthy volunteers during Valsalva maneuver
Design
Case-control study with impedance plethysmography
Authors
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Reduced splanchnic resistance drives aberrant Valsalva responses in POTS; supports non-autonomic mechanisms and leaves open targeted mechanistic trials.
Case-Control (n=27)
Does splanchnic hyperemia and hypervolemia explain aberrant blood pressure responses during the Valsalva maneuver in patients with postural tachycardia syndrome?
Splanchnic hyperemia and hypervolemia contribute to the excessive phase II blood pressure reduction during the Valsalva maneuver in POTS patients, suggesting mechanisms beyond autonomic dysfunction.
Stewart et al. (2005) conducted a case-control in Postural tachycardia syndrome (n=27). Postural tachycardia syndrome vs. Healthy volunteers was evaluated on Changes in splanchnic blood flow, resistance, and volume during Valsalva maneuver. Postural tachycardia syndrome is associated with splanchnic hyperemia and hypervolemia during the Valsalva maneuver, contributing to excessive phase II blood pressure reduction.