Discussion: The findings of this study represent the first demonstration of a sustained BP lowering effect associated with a procedure to correct the alignment of the Atlas vertebra. The improvement in BP following the correction of Atlas misalignment is similar to that seen by giving two different antihypertensive agents simultaneously. Moreover, this reduction in BP persisted at 8 weeks and was not associated with pain or pain relief or any other symptom that could be associated with a rise in BP.

Measure	Control			Treatment				P-value
Arterial blood pressure	Pre	Post		Pre	Post
Systolic BP	145.3	142.1	-3.2	147	129.8	-17.2	14.0	<0.0001
Diastolic BP	91.0	89.2	-1.8	92.5	82.2	-10.3	8.4	0.002
Pulse Rate	73.3	73.8	0.5	73.6	73.3	-0.3	-0.8	0.80
Alignment variables
Degree of pelvic distortion frontal plane	3.8	3.7	0.1	3.6	0.04	3.6	-3.5	<0.0001
Degree of pelvic distortion transverse plane	1.4	1.3	0.1	2.0	0.3	1.7	-1.6	0.0003
Lateral displacement of C-7	0.6	0.5	0.1	1.0	0.04	0.9	-0.8	0.002
Weight Differential	11.4	9.2	2.6	13.9	6.8	7.0	-4.5	0.10
% of weight differential	5.5	4.3	1.3	6.8	3.4	3.4	-2.1	0.12

Abbreviation: BP, blood pressure.

^a All values are expressed as means.

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