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Hypertension and Correlation to Cerebrovascular Change: A Brief Overview
Published in Ayman El-Baz, Jasjit S. Suri, Cardiovascular Imaging and Image Analysis, 2018
Heba Kandil, Dawn Sosnin, Ali Mahmoud, Ahmed Shalaby, Ahmed Soliman, Adel Elmaghraby, Jasjit S. Suri, Guruprasad Giridharan, Ayman El-Baz
An intra-arterial catheter is an invasive technique that provides direct, real-time continuous monitoring, typically in a hospital setting, and is considered the reference standard for blood pressure measurement. An arterial line is a thin catheter with a pressure transducer that is inserted into an artery (femoral, brachial, radial, etc.). A pressurized saline slow infusion system in the tubing allows a continuous slow flush through the catheter tip into the bloodstream. Distortion or deformation of a dome diaphragm on the pressure transducer varies with the changes in pressure of the saline column, which varies with arterial pressure pulsation. The diaphragm distortion causes changes in resistance in the transducer electrical circuit [20].
Correlation between time lag of arterial–plethysmographic waveforms and systemic vascular resistance: a prospective study
Published in Journal of Medical Engineering & Technology, 2018
Radhakrishnan Muthuchellappan, Ramesh V. J., Umamaheswara Rao Ganne S., Thennarasu K., Anjana Jacob, Sripathy G., Bhadrinarayan V., Mohanvelu K.
Patients were recruited after approval of institute ethics committee and written informed consent from the patients/their legal representatives. The study was performed according to Good Clinical Practices and in accordance with the Declaration of Helsinki. American Society of Anesthesiologists grades I and II adult patients aged 18–60 years undergoing intracranial surgery and requiring mannitol intra-operatively and arterial and central venous line placement for their routine intraoperative anaesthetic management were included in this study. Patients who had a history of hypertension and diabetes and patients on psychotropic medications were excluded. All patients were operated upon in supine position. To achieve uniformity, in the majority of patients’ arterial line was placed in the radial artery and the pulse oximeter probe was put in the corresponding thumb.
A custom made interface to integrate recording of pulse rate and blood pressure during urodynamics investigations
Published in Journal of Medical Engineering & Technology, 2018
Ian J. S. Boddy, Simon Fulford, Charlotte R. Kemp
The device is limited by its use of a sphygmomanometer cuff to record blood pressure and a pulse oximeter to record PR. The cuff can cause discomfort, have difficulty detecting the blood pressure at times and can only provide intermittent rather than continuous data. The pulse oximeter may also have difficulty detecting the pulse and have a tendency to fall off at vital moments. However, both devices are non-invasive and therefore preferable in our opinion to the alternative of an invasive arterial line, monitoring pulse and blood pressure continuously.