Minimally-invasive Assessment of Cardiac Output in Severe Preeclampsia
|First Submitted Date||April 23, 2007|
|First Posted Date||April 24, 2007|
|Last Update Posted Date||October 5, 2009|
|Start Date||April 2007|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures||Not Provided|
|Original Primary Outcome Measures||Not Provided|
|Change History||Complete list of historical versions of study NCT00465114 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures||Not Provided|
|Original Secondary Outcome Measures||Not Provided|
|Current Other Outcome Measures||Not Provided|
|Original Other Outcome Measures||Not Provided|
|Brief Title||Minimally-invasive Assessment of Cardiac Output in Severe Preeclampsia|
|Official Title||Minimally-invasive Assessment of Cardiac Output in Severe Preeclampsia: Radial Artery Wave Form Analysis Versus Trans-thoracic Echocardiogram|
Severe preeclampsia often presents with uncontrolled hypertension and therefore requires close monitoring of blood pressure and cardiac performance.
The purpose of the study is to compare two methods of measuring the performance of the heart in pregnant women: one by ultrasound of the heart, the other by assessing the pulse generated in the blood vessel of the wrist. We hope that the method using pulse analysis will be as effective as ultrasound, which is labour intensive and operator dependant.
Severe preeclampsia often presents with uncontrolled hypertension, which requires close monitoring of blood pressure and cardiac output. It will be very useful to know the cardiac output in this patient population, because it will guide the choice of antihypertensive drugs and measure their effect on cardiac output.
Traditionally pulmonary artery catheters were used to measure cardiac output. There are numerous problems with using this method in severe preeclampsia. These include technical difficulty inserting the catheter in an awake, edematous pregnant patient, potentially causing a pneumothorax, damaging the carotid artery or insertion site infection. There is also an increased risk for cardiac arrhythmias. Apart from the risks, the accuracy of the thermodilution measurements can be influenced by factors such as timing of the injection within the respiratory cycle, temperature of the injectate, speed of injection, and placement of the catheter. A readily available, accurate non-invasive cardiac output measurement technique, that will provide reliable data with fewer risks, is needed.
Doppler ultrasound (trans thoracic echocardiography) is the gold standard for measuring cardiac output non-invasively in pregnant patients. Unfortunately the method is operator dependant, not continuous and not always available when needed most.
Recently a device called the FloTrac has been introduced that measures cardiac output minimally invasively. Attached to an arterial line it measures cardiac output every 20 seconds via arterial waveform analysis. The standard of care for measuring blood pressure in severe preeclampsia requires the placement of an intra-arterial line. This group of patients is therefore ideal for measuring cardiac output with the FloTrac, especially since powerful intravenous anti-hypertensives are used to control blood pressure.
Our hypothesis is that the FloTrac will be comparable to Doppler Ultrasound for measuring cardiac output in severely preeclamptic patients.
|Study Design||Observational Model: Cohort
Time Perspective: Prospective
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Probability Sample|
|Study Population||Primary Care Clinic|
|Intervention||Procedure: Hemodynamic Monitoring|
|Study Groups/Cohorts||Not Provided|
|Publications *||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Estimated Completion Date||December 2007|
|Primary Completion Date||Not Provided|
|Ages||18 Years and older (Adult, Senior)|
|Accepts Healthy Volunteers||No|
|Contacts||Contact information is only displayed when the study is recruiting subjects|
|Listed Location Countries||Canada|
|Removed Location Countries|
|Other Study ID Numbers||07-06
|Has Data Monitoring Committee||No|
|U.S. FDA-regulated Product||Not Provided|
|IPD Sharing Statement||Not Provided|
|Responsible Party||Not Provided|
|Study Sponsor||Samuel Lunenfeld Research Institute, Mount Sinai Hospital|
|PRS Account||Samuel Lunenfeld Research Institute, Mount Sinai Hospital|
|Verification Date||October 2009|