Measuring Cardiac Output and Stroke Volume Using the Physioflow Impedance Device in Pregnant Patients

The Physioflow Impedance device employs a continuous non-invasive method of measuring ten cardiac hemodynamic parameters including flow, resistance, contractility and fluid content. It involves the application of electrocardiogram (ECG) leads on the neck and the thorax to measure resistance of pulsatile blood flow. Its benefits are that it is non-invasive, low cost, and easy to operate. Thoracic impedance has been validated against the gold standard method of PAC. Although the Physioflow device has been validated in non-pregnant patients, its use in pregnant patients is very limited.

Moderate to severe hypotension, experienced by these awake patients, can cause significant undesirable symptoms of dizziness, shortness of breath, nausea and vomiting, and also compromise fetal well-being. The etiology of hypotension is multi-factorial,and it is postulated that decreases in cardiac output (CO), stroke volume (SV) and/or systemic vascular resistance (SVR) may precede decreases in blood pressure. Continuous measurement of CO and SV by the Physioflow Impedance device may provide a better understanding of the cause of hypotension so that future management of these patients may include pharmacological interventions used prior to hypotension in order to avoid any undesirable symptoms.

Inclusion criteria

• Women undergoing elective cesarean section
• Women classified as ASA 1 & 2

Exclusion criteria

• Patients unable to communicate in English
• Patients with significant cardiac disease
• Height less than 4 feet or greater than 7 feet
• Weight less than 67 lbs or greater than 341 lbs