They are driven by the body’s imperfect striving for internal equilibrium that is kept slightly off-balance by inefficiencies in the cardiovascular regulatory system. These changes are not caused by any contact between the cuff and the torso. There are individuals who display what appear to be RBPF, but for whom there is a delay in the cardiovascular response by about 2-3 s after the associated inhalation and exhalation. The solution is to reposition the arm or cuff so that the cuff no longer comes in contact with the torso. If the result is an increase in the tracing baseline during a scoring window, it can complicate the analysis of the data. The torso can transfer mechanical pressure to the cuff during breathing which will appear as a regular slow wave in the tracing.
When the inhalations and exhalations track exactly with the changes in the cardiovascular data, and they occur simultaneously, the cause is likely that the blood pressure cuff is in direct contact with the torso. In the past, this was mistakenly but routinely called “vagus roll,” but is more correctly labeled “respiratory blood pressure fluctuations,” or RBPF ( Handler and Reicherter, 2008). This is a good point to discuss the regular undulations sometimes seen in the cardiovascular channel that appear to be associated with the examinee’s breathing.
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