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Ability of non‐invasive intermittent blood pressure monitoring and a continuous non‐invasive arterial pressure monitor (CNAP ™ ) to provide new readings in each 1‐min interval during elective caesarean section under spinal anaesthesia
Author(s) -
McCarthy T.,
Telec N.,
Dennis A.,
Griffiths J.,
Buettner A.
Publication year - 2012
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1111/j.1365-2044.2011.06996.x
Subject(s) - medicine , elective caesarean section , blood pressure , caesarean section , interval (graph theory) , anesthesia , cardiology , pregnancy , genetics , biology , mathematics , combinatorics
Summary We compared the ability of automated non‐invasive intermittent oscillometric blood pressure monitoring with a new device, CNAP TM (continuous non‐invasive arterial pressure) to provide a new blood pressure reading in each 1‐min interval between spinal anaesthesia and delivery during caesarean section. We also compared the accuracy of continuous non‐invasive arterial pressure readings with non‐invasive blood pressure measurements before spinal anaesthesia. Fifty‐nine women participated. The non‐invasive and continuous non‐invasive monitors displayed new blood pressure readings in a mean of 82% (11%) and 83% (13%) (p = 0.97) of the one‐minute intervals between spinal anaesthesia and delivery, respectively. Continuous non‐invasive arterial pressure was more likely to fail on two or more consecutive minutes (p = 0.001). From the pre‐spinal readings, the mean bias, defined as non‐invasive – continuous non‐invasive arterial pressure, and limits of agreement (±2SD mean bias) for systolic, diastolic and mean blood pressure respectively were +1.3 (±26.0), −2.9 (±21.8) and +2.6 (±20.4) mmHg. The new monitor has disadvantages compared with conventional non‐invasive intermittent blood pressure monitoring.