Headaches significantly impact patients' quality of life, with tension-type headaches and migraines being among the most prevalent types. There is growing evidence suggesting that blood pressure regulation and baroreceptor activity play a role in headache pathophysiology. Carotid sinus massage (CSM), particularly when combined with the modified Trendelenburg position, may modulate autonomic nervous system activity to relieve headache symptoms. An initial open-label pilot study (n = 17) was completed, and the results were published in a preprint server for health sciences, the Medical Research Archive (medRxiv), demonstrating the feasibility, safety, and promising preliminary efficacy of CSM+T. Based on these findings, a follow-up randomized, sham-controlled, parallel-arm trial will further evaluate the efficacy of the treatment.
This protocol includes two study phases: 1. Pilot Phase (Completed): A single-arm, open-label pilot study was conducted in 17 participants to assess the feasibility and safety of CSM+T for the relief of headaches. Results have been published in medRxiv and support continued investigation. 2. Parallel-Arm Phase (Planned): A randomized, sham-controlled, parallel-arm clinical trial will now be implemented to evaluate efficacy. This phase will enroll 18 participants (9 per arm) to detect a clinically meaningful difference in headache relief with 80% power (α = 0.05, two-sided), accounting for potential attrition.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
18
Manual stimulation of the carotid sinus area combined with head-down tilt positioning to activate baroreceptors for headache relief.
Light neck contact, avoiding carotid sinus pressure, paired with identical body positioning to mimic the experimental intervention.
Hospital Pedro T.Orellana, Trenque Lauquen
Trenque Lauquen, Buenos Aires, Argentina
RECRUITINGChange in headache pain intensity
Change in self-reported pain intensity using a 10-point Visual Analog Scale (VAS)
Time frame: Baseline to 15 minutes post-intervention
Change in blood pressure
Difference in systolic and diastolic blood pressure (mmHg) from baseline to 15 minutes after the intervention.
Time frame: Baseline to 15 minutes post-intervention
Change in heart rate
Difference in heart rate (beats per minute) measured before and after the intervention to assess autonomic or cardiovascular effects of the treatment.
Time frame: Baseline to 15 minutes post-intervention
Change in oxygen saturation
Difference in peripheral oxygen saturation (SpO₂, %) measured by pulse oximetry before and after the intervention.
Time frame: Baseline to 15 minutes post-intervention
Percentage of participants with complete pain relief (VAS = 0)
Proportion of participants reporting a Visual Analog Scale (VAS) pain score of 0-indicating complete headache relief-15 minutes after the intervention. VAS scores range from 0 (no pain) to 10 (worst possible pain)
Time frame: 15 minutes post-intervention
Headache recurrence rate
Proportion of participants who experience recurrence of headache symptoms within 24 hours following the intervention.
Time frame: 24 hours post-intervention
Incidence of adverse events
Number and type of adverse events reported within 24 hours of the intervention, including any hemodynamic instability, discomfort, or other complications.
Time frame: Up to 24 hours post-intervention
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