Med Biol Eng Comput - Effect of respiration on Korotkoff sounds and oscillometric cuff pressure pulses during blood pressure measurement.


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Blood pressure (BP) measurement accuracy depends on consistent changes in Korotkoff sounds (KorS) for manual measurement and oscillometric pulses for automated measurement, yet little is known about the direct effect of respiration on these physiological signals. The aim of this research was to quantitatively assess the modulation effect of respiration on Korotkoff sounds and oscillometric pulses. Systolic and diastolic blood pressures were measured manually from 30 healthy subjects (age 41???12?years). Three static cuff pressure conditions were studied for two respiratory rates. Cuff pressure [with oscillometric pulses (OscP)], ECG, chest motion respiration [respiration signal (Resp), from magnetometer] and Korotkoff sounds (KorS, from digital stethoscope) were recorded twice for 20?s. The physiological data were evenly resampled. Respiratory frequency was calculated from Resp (fR), OscP (fO) and KorS (fK) from peak spectral frequency. There was no statistically significant difference between fR and fO or fK. Respiratory modulation was observed in all subjects. OscP amplitude modulation changed significantly between the two respiratory rates (p?<?0.05) and between the three cuff pressures (p?<?0.0001), and decreased significantly with decreasing cuff pressure (p?<?0.05). The phase shift between Resp and modulation of OscP was statistically significant with respiratory rates (p?<?0.05), but not with cuff pressures. It is accepted that BP in individuals is variable and that this relates to respiration; we now show that this respiration modulates oscillometric pulse and Korotkoff sound amplitudes from which BP is measured.

Resumo Limpo

blood pressur bp measur accuraci depend consist chang korotkoff sound kor manual measur oscillometr puls autom measur yet littl known direct effect respir physiolog signal aim research quantit assess modul effect respir korotkoff sound oscillometr puls systol diastol blood pressur measur manual healthi subject age year three static cuff pressur condit studi two respiratori rate cuff pressur oscillometr puls oscp ecg chest motion respir respir signal resp magnetomet korotkoff sound kor digit stethoscop record twice s physiolog data even resampl respiratori frequenc calcul resp fr oscp fo kor fk peak spectral frequenc statist signific differ fr fo fk respiratori modul observ subject oscp amplitud modul chang signific two respiratori rate p three cuff pressur p decreas signific decreas cuff pressur p phase shift resp modul oscp statist signific respiratori rate p cuff pressur accept bp individu variabl relat respir now show respir modul oscillometr puls korotkoff sound amplitud bp measur

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