The Effect of Enhanced External Counter Pulsation on Left Ventricular Systolic and Diastolic Function
Enhanced external counter pulsation (EECP) is a procedure performed on patients with ischemic heart disease. The treatment improves physical capacity and relieves angina pectoris. It is suitable for patients with persistent angina pectoris despite and for patients not amendable for coronary revascularization. Some studies demonstrate a relationship between diastolic and systolic blood pressure ratio (d/s ratio) and the effect of EECP.
The aim of the investigators study is to understand the effect of EECP on left ventricular systolic and diastolic function assessed by trans-thoracic echocardiography (TTE).
Hypothesis: EECP improves left ventricular systolic and diastolic function. There is a relationship between d/s ratio and aortic arterial stiffness EECP improves left ventricular diastolic function Standard TTE would be performed prior the EECP procedure, which lasts 60 min., and repeated every 15 minutes. Moreover the investigators would measure pulse wave velocity, a measure of aortic arterial stiffness, in order to investigate the relationship between the d/s ratio and arterial stiffness.
The patients would be recruited among former study patients who have undergone EECP before. 20 patients with the best acoustic conditions would be selected and invited to enroll into the study.
|Study Design:||Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
|Official Title:||The Effect of Enhanced External Counter Pulsation on Left Ventricular Systolic and Diastolic Function|
- Left ventricular longitudinal strain [ Time Frame: 60 minutes ] [ Designated as safety issue: No ]A measure of left ventricular shortening during systole assessed by speckle tracking with trans thoracic echocardiography
- Pulse wave velocity [ Time Frame: 60 minutes ] [ Designated as safety issue: No ]Pulse wave velocity is a measure of aortic arterial stiffness. The outcome is the relationhip between pulse wave velocity and d/s ratio
- left ventricular diastolic function [ Time Frame: 60 minutes ] [ Designated as safety issue: No ]EECP reduces left ventricular after load and increases cardiac output. Left ventricular diastolic function is assessed by tissue Doppler imaging
|Study Start Date:||March 2010|
|Estimated Study Completion Date:||November 2010|
|Estimated Primary Completion Date:||November 2010 (Final data collection date for primary outcome measure)|
Experimental: Enhanced external counter pulsation
One session of enhanced external counter pulsation (60 minutes)
Device: Enhanced external counter pulsation
While an individual is undergoing ECP, they have pneumatic stockings (also known as cuffs) on their legs and are connected to telemetry monitors that monitor their heart rate and rhythm.The cuffs should ideally inflate at the beginning of diastole and deflate at the beginning of systole. During the inflation portion of the cycle, the calf cuffs inflate first, then the lower thigh cuffs and finally the upper thigh cuffs. Inflation is controlled by a pressure monitor, and the cuffs are inflated to about 300 mmHg.
|Herning, Denmark, 7400|
|Principal Investigator:||Ashkan Eftekhari, MD PhD||Regionshospitalet Herning / Dept. Pharmacology Aarhus University|
|Study Chair:||Ole May, MD PhD||Regionshospitalet Herning|