Blood Pressure Measurement by Arterial Tonometry in Controlled Hypotension

Noninvasive assessment of left ventricular pressure–area relationship using transesophageal echocardiography and tonometry during cardiac and abdominal aortic surgery

“…This device records radial arterial pressure by compressing the radial artery between the radius bone and the pressure sensor. The compressing force was adjusted so as not to narrow the artery but establish a steady contact with the artery through the flat surface of the sensor, with the force level adjust to be equivalent to the intravascular pressure [16]. A median sternotomy was performed, and a micromanometer catheter (Micro-Tip pressure transducer, MPC-500; Miller, Houston, TX, USA) was advanced into the LV through the right upper pulmonary vein.…”

“…Automated echocardiographic measures of the LV cavity area have been shown to closely correlate with changes in LV volume [7][8][9][10][11][12][13][14]. Based on the assumption that LV pressure is similar to that of the aorta and femoral artery during the ejection phase, Gorcsan et al [9] constructed LV pressure-area loops using automated echocardiographic LV area and recording femoral arterial pressure, and demonstrated a good correlation between end-systolic pressure-area relationship using LV pressure and femoral arterial pressure.Arterial pressure waveforms can be measured noninvasively and continuously by the use of arterial tonometry [15][16][17]. Arterial tonometry provides accurate and reliable real-time monitoring of blood pressure even during induced hypotension [16].…”

“…Arterial pressure waveforms can be measured noninvasively and continuously by the use of arterial tonometry [15][16][17]. Arterial tonometry provides accurate and reliable real-time monitoring of blood pressure even during induced hypotension [16].…”

“…Arterial tonometry provides accurate and reliable real-time monitoring of blood pressure even during induced hypotension [16]. The purpose of this study was to evaluate LV performance intraoperatively by online pressure-area relationship using ABD of TEE and arterial tonometry in a manner similar to pressure-volume analysis.…”

Performance of a tonometer for arterial pressure measurement during anesthesia in the elderly

“…Although tonometric arterial pressure has been measured in various clinical situations [1][2][3], how arterial tonometry is affected by the degeneration associated with aging has not been clarified. In addition, in older patients, preoperative complications such as hypertension and diabetes mellitus may exist, which are regarded as promoters of atherosclerosis [4].…”