In patients with acute cervical pain, pulsatile arteries within 1–2 cm of active upper-trapezius trigger points show a higher Doppler pulsatility index than arteries near palpably normal sites in the same muscle.

Ballyns et al. (2011) directly demonstrated that pulsatile arteries within 1–2 cm of active upper-trapezius trigger points exhibited a significantly higher pulsatility index (median 8.3) compared to palpably normal control sites in the same muscle (median 3.0, P < .05). The strongest opposing consideration is that the measured vessels were conduit-caliber arteries (>1 mm) rather than microvessels, and the comparison was conducted within symptomatic patients lacking pain-free controls.

In Ballyns et al. (VASO-E022), Doppler examination revealed that arteries near active upper-trapezius trigger points exhibited a significantly higher pulsatility index (median 8.3) than palpably normal sites (median 3.0) in patients with cervical pain. The strongest opposing consideration is that pulsatility index exhibited high variance and poor classification performance in ROC analysis, and was measured in vessels 1–2 cm away from the point rather than in the local microvascular bed.

Ballyns et al. (2011) directly measured color Doppler waveforms in patients with cervical pain, finding a statistically significant elevation in pulsatility index near active upper-trapezius trigger points (median 8.3) compared to palpably normal sites (median 3.0, P < .05). The strongest opposing consideration is that the sample size was modest (n=44), comparisons were made within symptomatic patients rather than against pain-free controls, and pulsatility index exhibited high variance.

VASO-E022 anchors this directly with a significant pulsatility-index difference at active versus normal sites from a blinded-sonographer study. The strongest opposing consideration is that the same source concedes PI was a poor individual-site classifier due to variance, and the vessels interrogated are >1 mm conduits 1–2 cm away — the claim as a measurement statement holds, but its mechanistic reading does not follow.

The primary text directly reports that vessels near active sites had significantly higher pulsatility index (median 8.3 vs 3.0, P < .05) (VASO-E022), anchored with quotes from the open-access manuscript. The strongest opposing considerations: the comparison is within symptomatic patients with no pain-free controls (VASO-E026), the pulsatility index failed ROC classification of individual sites due to large variance (VASO-E024, VASO-E025), and the interrogated vessels are >1 mm conduit-scale, far from the arterioles the featured mechanism names — the group-level difference the claim states is solid; the latch reading of it is not.

VASO-E022 records the primary result directly: median PI 8.3 at active versus 3.0 at normal sites, significant at P < .05, from a study with blinded sonographers. The opposing considerations are that vessels interrogated are >1 mm conduits 1–2 cm from the point, PI had large variance and classified sites poorly, and there was no pain-free control group (VASO-E026).

VASO-E022 directly reports a significantly higher Doppler pulsatility index in arteries near active upper-trapezius sites than near palpably normal sites in the same symptomatic muscle. The anatomical distance and clinical population match the claim. The strongest opposing consideration is the large variance, poor individual classification, absence of pain-free controls, and use of vessels larger and farther from the point than the hypothesized microvascular compartment.

VASO-E022 directly reports a significantly higher median Doppler pulsatility index near active upper-trapezius sites than near palpably normal sites in patients with acute cervical pain. The vessels were within the stated distance, although generally larger than the microvessels invoked by the latch hypothesis. The strongest opposing consideration is VASO-E026: there was no pain-free control group, and large variance made pulsatility a poor classifier of site status.

VASO-E022 directly reports a significantly higher pulsatility index in arteries near active upper-trapezius sites than near palpably normal sites in the same symptomatic muscles. The population and spatial comparison match the claim closely. The strongest opposing consideration is the absence of pain-free controls and the large variance that made pulsatility a poor site classifier.

Ballyns 2011 reports significantly higher Doppler pulsatility index near active upper-trapezius sites (median 8.3) than near palpably normal sites (median 3.0) within the same symptomatic patients. No pain-free controls; large variance; vessels >1 mm and 1–2 cm distant. Strongest opposing consideration is that the index failed as an individual-site classifier and "normal" sites sit in symptomatic muscle.

Ballyns 2011 reports significantly higher Doppler pulsatility index near active upper-trapezius trigger points than near palpably normal sites in the same muscle (median 8.3 vs 3.0) (E022). Within-patient symptomatic cohort and large variance limit diagnostic use, yet the group difference is directly measured. Strongest opposing consideration is the absence of a pain-free control group and the conduit-scale vessels imaged.

Ballyns 2011 reports significantly higher Doppler pulsatility index near active upper-trapezius TPs (median 8.3) than normal sites (3.0) in acute cervical pain patients. Limited by within-patient symptomatic controls, large variance (PI not a good classifier), and conduit- scale vessels 1–2 cm from the point. Strongest opposing consideration: compression by contracture or transducer pressure can raise pulsatility without distal arteriolar latch.

The claim is a faithful restatement of a reported measurement: median pulsatility index 8.3 near active sites versus 3.0 near normal sites, P < .05, in 44 patients with acute cervical pain (VASO-E022), with sonographers blinded to clinical status. Its scope is properly hedged to the patient population and vessel distance. The strongest opposing consideration is that the source's own ROC analysis found PI a poor classifier of site type because of large variance, and that the "normal" comparison sites lay in symptomatic muscle with no pain-free control group (VASO-E024, VASO-E026), so the group-level difference may reflect a gradient within diseased muscle rather than a trigger-point property. Single study, unreplicated.

VASO-E022 reports exactly this: median pulsatility index 8.3 near active sites versus 3.0 near palpably normal sites in the same muscle, P < .05, with sonographers blinded to clinical status. It is a single unreplicated study whose own ROC analysis found the index a poor classifier because of large variance (VASO-E025), and whose "normal" comparison sites lie in symptomatic muscle with no pain-free control group (VASO-E026). The claim as worded is careful — patients with acute cervical pain, within-muscle comparison, 1–2 cm — and survives those caveats; what it does not survive is generalization to microvessels or to pain-free people.

VASO-E022 quotes the source directly: vessels near active sites had a significantly higher pulsatility index (median 8.3 versus 3.0, P < .05) than near palpably normal sites in the same muscle, in 44 patients with acute cervical pain. That is a real, blinded-sonographer measurement matching the claim's careful scope. The strongest opposing considerations are that this is a single study from the same NIH lineage as VASO-E006, that the source's own ROC analysis found pulsatility index a poor classifier of site type because of large variance (VASO-E024, VASO-E025), and that there was no pain-free control group, so the comparator is itself abnormal-adjacent tissue (VASO-E026).

Ballyns 2011 (VASO-E022, moderate) reports a median pulsatility index of 8.3 near active sites versus 3.0 near normal sites (P < .05) in 44 patients, with sonographers blinded to site class. The comparison is within symptomatic patients with no pain-free control group (VASO-E026), the index varied too widely to classify individual sites, and the vessels are pulsatile arteries or enlarged arterioles >1 mm, 1–2 cm from the point.

Ballyns 2011 reports a median pulsatility index of 8.3 near active sites against 3.0 near normal sites, P<.05 (VASO-E022). Qualified by the absence of a pain-free control group and the authors' statement that the findings do not represent normal variation (VASO-E026); the index varied too widely to classify sites; vessels were conduit-caliber and 1–2 cm from the point.

VASO-E022 supports (median pulsatility index 8.3 vs 3.0); VASO-E026 qualifies (no pain-free controls). Vessels are conduit-scale, 1–2 cm from the point.

VASO-E022 (supports): median pulsatility index 8.3 near active sites against 3.0 near normal sites, sonographers blinded. VASO-E026 (qualifies): no pain-free control group; the normal sites lie in symptomatic muscle and the authors say the findings do not represent normal variation.

Median pulsatility index 8.3 near active sites against 3.0 near normal sites, blinded sonographers (VASO-E022); all sites within symptomatic patients, no pain-free controls, and the authors say the findings do not represent normal variation (VASO-E026).

Median pulsatility index 8.3 near active sites against 3.0 near normal sites, sonographers blinded (VASO-E022, moderate). No pain-free control group; 'normal' sites sit in symptomatic muscle (VASO-E026, qualifies). The vessels are pulsatile arteries typically over a millimeter, 1–2 cm from the point.

Ballyns 2011 reports a median pulsatility index of 8.3 near active sites against 3.0 near normal sites (VASO-E022, moderate); qualified by the absence of a pain-free control group (VASO-E026). Vessels interrogated were conduit-scale, 1–2 cm from the point.

Pulsatility index median 8.3 near active sites against 3.0 near normal sites, sonographers blinded (VASO-E022, moderate); qualified because the 'normal' sites sat in symptomatic muscle with no pain-free control group and the index varied too widely to classify sites (VASO-E026).

Reported directly by the primary (VASO-E022): median pulsatility index 8.3 near active sites against 3.0 near normal sites, blinded sonographers. Qualified by VASO-E026: no pain-free controls, 'normal' sites in symptomatic muscle. The vessels are conduit-scale and the index could not classify individual sites.

Median pulsatility index 8.3 near active sites against 3.0 near normal sites, P<.05 (VASO-E022), in conduit-scale arteries; qualified by no pain-free control group (VASO-E026) and by the source's own finding that the index could not classify sites.

Ballyns 2011 reports a median pulsatility index of 8.3 near active sites against 3.0 near palpably normal sites (VASO-E022), in pulsatile arteries typically over a millimetre across, 1–2 cm from the point; there was no pain-free control group and the authors say the findings do not represent normal variation (VASO-E026).

Ballyns 2011 reports a median pulsatility index of 8.3 near active sites against 3.0 near normal sites (VASO-E022, moderate), in vessels typically over a millimeter across within 1–2 cm of the point. Capped by the same source: no pain-free control group, 'normal' sites in symptomatic muscle, and the authors' statement that the findings do not represent normal variation (VASO-E026).

Ballyns 2011 (VASO-E022, moderate): pulsatility index median 8.3 near active sites against 3.0 near normal sites, P < .05, sonographers blinded. Qualified by the same paper (VASO-E026): no pain-free control group, 'normal' sites in symptomatic muscle, so the finding does not represent normal variation; and the index varied too widely to classify individual sites. Vessels interrogated were pulsatile arteries typically over a millimeter, 1–2 cm from the point.

Ballyns et al. 2011 (VASO-E022) directly documented that arteries within 1–2 cm of active upper-trapezius trigger points had a significantly higher Doppler pulsatility index (median 8.3) compared to palpably normal sites in the same muscle (median 3.0, P < .05). The strongest opposing consideration is that normal comparator sites were situated within symptomatic patients who had trigger points elsewhere in the trapezius, meaning the findings do not reflect baseline variation in healthy, pain-free controls (VASO-E026).

The reported group-level difference is real (median PI 8.3 versus 3.0, P < .05, E022), and the claim as stated is scoped exactly to that finding. The strongest opposing considerations are that the same source reports no resistivity-index difference and that the pulsatility index was a poor site classifier due to large variance (E024, E025), and that all sites sat in symptomatic patients with no pain-free control group (E026). Single study, single lineage; not replicated.

VASO-E022 directly reports a significantly higher median pulsatility index in arteries near active upper-trapezius sites than near palpably normal sites in the same symptomatic patients. This establishes the study-specific comparison stated in the claim. The strongest opposing consideration is that there was no pain-free control group, the vessels were generally larger and farther from the point than the proposed microvessels, and pulsatility index classified individual sites poorly.

Ballyns 2011 directly reports significantly higher pulsatility index near active upper-trapezius TPs versus normal sites in the same muscle (E022). Limitations: within-patient symptomatic cohort, large variance, conduit-scale vessels 1–2 cm away. Strongest opposing consideration is that PI did not classify individual sites well and mechanical compression is an equal alternative explanation.

Ballyns et al. 2011 reports exactly this: in patients with acute cervical pain, vessels near active sites had a significantly higher pulsatility index (median 8.3) than those near palpably normal sites (median 3.0, P < .05) (E022). The claim correctly limits the comparison to sites within the same muscle. It is one study from one lineage, unreplicated in the ledger, so the generalization is provisional. Strongest opposing consideration: the index varied so widely that it could not classify individual sites, and the companion resistivity index showed no difference (E024, E025). The authors also list transducer pressure among causes of raised outflow resistance (E027), and the vessels were pulsatile arteries or enlarged arterioles typically over 1 mm, 1–2 cm from the point. This is a fragile group-level finding at conduit scale, not a microvascular signature.

A median pulsatility index of 8.3 near active points against 3.0 near normal sites (VASO-E022), from one blinded-sonographer study, capped by the absence of pain-free controls (VASO-E026). The vessels were arteries over a millimetre across, not microvessels.