An inflatable cuff wrapped around the upper arm is widely used in noninvasive blood pressure measurement.However, the mechanical interaction between cuff and arm tissues, a factor that potentially affects the accuracy...An inflatable cuff wrapped around the upper arm is widely used in noninvasive blood pressure measurement.However, the mechanical interaction between cuff and arm tissues, a factor that potentially affects the accuracy of noninvasive blood pressure measurement, remains rarely addressed. In the present study, finite element（FE） models were constructed to quantify intra-arm stresses generated by cuff compression, aiming to provide some theoretical evidence for identifying factors of importance for blood pressure measurement or explaining clinical observations. Obtained results showed that the simulated tissue stresses were highly sensitive to the distribution of cuff pressure on the arm surface and the contact condition between muscle and bone. In contrast, the magnitude of cuff pressure and small variations in elastic properties of arm soft tissues had little influence on the efficiency of pressure transmission in arm tissues. In particular, it was found that a thickened subcutaneous fat layer in obese subjects significantly reduced the effective pressure transmitted to the brachial artery, which may explain why blood pressure overestimation occurs more frequently in obese subjects in noninvasive blood pressure measurement.展开更多
目的探讨专利产品带刻度袖带测量粗臂围者血压的应用价值。方法采用带刻度袖带同时测量65例臂围>26 cm者的血压和臂围者。依据小号袖带高估粗臂围血压的理论进行校正:臂围每增加1 cm将实测收缩压相应减低1 mm Hg、实测舒张压相应减低...目的探讨专利产品带刻度袖带测量粗臂围者血压的应用价值。方法采用带刻度袖带同时测量65例臂围>26 cm者的血压和臂围者。依据小号袖带高估粗臂围血压的理论进行校正:臂围每增加1 cm将实测收缩压相应减低1 mm Hg、实测舒张压相应减低2/3 mm Hg;其中有48例受试者粗臂围与实测收缩压>140 mm Hg和(或)舒张压>90 mm Hg同时存在,按简化经验公式计算校正。将实测值和校正值与同步有创导管测压相比较。结果 65例受试者臂围在26～38 cm之间,平均(31.9±2.3)cm。校正收缩压和舒张压与导管测压结果接近[(143.5±9.6)mm Hg比(142.7±9.5)mm Hg;(84.6±6.8)mm Hg比(83.9±6.7)mm Hg,均为P>0.05];而实测收缩压和舒张压明显高于导管测压结果[(150.1±10.3)mm Hg比(142.7±9.5)mm Hg;(89.4±7.5)mm Hg比(83.9±6.7)mm Hg,均为P<0.01]。结论带刻度袖带测量粗臂围者血压校正结果更准确,能避免"袖带性高血压"。展开更多
基金supported in part by the National Natural Science Foundation of China (Grant 81370438)the SJTU Medical-Engineering Cross-cutting Research Project (Grant YG2015MS53)supported by the Hui-Chun Chin and Tsung-Dao Lee Chinese Undergraduate Research Program Endowment
文摘An inflatable cuff wrapped around the upper arm is widely used in noninvasive blood pressure measurement.However, the mechanical interaction between cuff and arm tissues, a factor that potentially affects the accuracy of noninvasive blood pressure measurement, remains rarely addressed. In the present study, finite element（FE） models were constructed to quantify intra-arm stresses generated by cuff compression, aiming to provide some theoretical evidence for identifying factors of importance for blood pressure measurement or explaining clinical observations. Obtained results showed that the simulated tissue stresses were highly sensitive to the distribution of cuff pressure on the arm surface and the contact condition between muscle and bone. In contrast, the magnitude of cuff pressure and small variations in elastic properties of arm soft tissues had little influence on the efficiency of pressure transmission in arm tissues. In particular, it was found that a thickened subcutaneous fat layer in obese subjects significantly reduced the effective pressure transmitted to the brachial artery, which may explain why blood pressure overestimation occurs more frequently in obese subjects in noninvasive blood pressure measurement.
