Cardiac Magnetic Resonance in pregnant women
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1 Cardiac Magnetic Resonance in pregnant women Chen SSM, Leeton L, Dennis AT Royal Women s Hospital and The University of Melbourne, Parkville, Australia alicia.dennis@thewomens.org.au
2 Quantification of haemodynamics and myocardial tissue characteristics in healthy pregnant women and women with pre-eclampsia using cardiac magnetic resonance Chen SSM, Leeton L, Dennis AT Royal Women s Hospital and The University of Melbourne, Parkville, Australia alicia.dennis@thewomens.org.au
3 Disclosures None
4 Background Pre-eclampsia is a pregnancy specific hypertensive cardiovascular disorder Short term peripartum complications Long term cardiovascular problems Prevalence is not changing millions of women affected each year Dennis AT, Castro JM, Simmons SW, Carr C, Permezel M, Royse CF. Haemodynamics in women with untreated pre-eclampsia. Anaesthesia 2012;67(10): Dennis AT, Castro JM. Haemodynamics and hypertension in pregnant women is a unified theory of preeclampsia possible? Anaesthesia 2014;69(11):
5 Background Acute cardiac changes in women with pre-eclampsia: preserved ejection fraction increased cardiac output pericardial effusions reduced diastolic function increased left ventricular wall thickness Dennis AT, Castro JM, Simmons SW, Carr C, Permezel M, Royse CF. Haemodynamics in women with untreated pre-eclampsia. Anaesthesia 2012;67(10): Dennis AT, Castro JM. Haemodynamics and hypertension in pregnant women is a unified theory of preeclampsia possible? Anaesthesia 2014;69(11):
6 Background Acute cardiac changes in women with pre-eclampsia: preserved ejection fraction increased cardiac output pericardial effusions reduced diastolic function increased left ventricular wall thickness Dennis AT, Castro JM, Simmons SW, Carr C, Permezel M, Royse CF. Haemodynamics in women with untreated pre-eclampsia. Anaesthesia 2012;67(10): Dennis AT, Castro JM. Haemodynamics and hypertension in pregnant women is a unified theory of preeclampsia possible? Anaesthesia 2014;69(11):
7 Background Acute cardiac changes in women with pre-eclampsia: preserved ejection fraction increased cardiac output pericardial effusions reduced diastolic function increased left ventricular wall thickness Dennis AT, Castro JM, Simmons SW, Carr C, Permezel M, Royse CF. Haemodynamics in women with untreated pre-eclampsia. Anaesthesia 2012;67(10): Dennis AT, Castro JM. Haemodynamics and hypertension in pregnant women is a unified theory of preeclampsia possible? Anaesthesia 2014;69(11):
8 Background The left ventricular thickness (diameter) is used to calculate the left ventricular mass (American Society of Echocardiography method)
9 Background The left ventricular thickness (diameter) is used to calculate the left ventricular mass (American Society of Echocardiography method) Left ventricular mass = [1.04 ([LVID + PWT + IVST] 3 LVID 3 )]
10 Background The left ventricular thickness (diameter) is used to calculate the left ventricular mass (American Society of Echocardiography method) Left ventricular mass = [1.04 ([LVID + PWT + IVST] 3 LVID 3 )] Left ventricular internal diameter
11 Background The left ventricular thickness (diameter) is used to calculate the left ventricular mass (American Society of Echocardiography method) Left ventricular mass = [1.04 ([LVID + PWT + IVST] 3 LVID 3 )] Left ventricular internal diameter Posterior wall diameter
12 Background The left ventricular thickness (diameter) is used to calculate the left ventricular mass (American Society of Echocardiography method) Left ventricular mass = [1.04 ([LVID + PWT + IVST] 3 LVID 3 )] Interventricular septum diameter Left ventricular internal diameter Posterior wall diameter
13 Background The left ventricular thickness (diameter) is used to calculate the left ventricular mass (American Society of Echocardiography method) Left ventricular mass = [1.04 ([LVID + PWT + IVST] 3 LVID 3 )] Interventricular septum diameter Where 1.04 = specific gravity of the myocardium (g/ml) assuming uniformity in structure and composed of muscle Left ventricular internal diameter Posterior wall diameter
14 Background HOWEVER Echocardiography cannot differenciate between causes of increased wall thickness Dennis AT, Castro JM, Simmons SW, Carr C, Permezel M, Royse CF. Haemodynamics in women with untreated pre-eclampsia. Anaesthesia 2012;67(10): Dennis AT, Castro JM. Haemodynamics and hypertension in pregnant women is a unified theory of preeclampsia possible? Anaesthesia 2014;69(11):
15 Background HOWEVER Echocardiography cannot differenciate between causes of increased wall thickness?myocardial oedema or?fibrosis or?muscle
16 Background Short term peripartum problems?myocardial oedema may be responsible for the diastolic changes that predispose women to acute pulmonary oedema Long term cardiovascular problems?myocardial fibrosis (an acute injury during pre-eclampsia) may predispose women to heart failure, hypertension and ischaemic heart disease later in life
17 Background Short term peripartum problems?myocardial oedema may be responsible for the diastolic changes that predispose women to acute pulmonary oedema Long term cardiovascular problems?myocardial fibrosis (an acute injury during pre-eclampsia) may predispose women to heart failure, hypertension and ischaemic heart disease later in life Historically the only way to determine the characteristics of the myocardium was to biopsy it or to examine it post-mortem
18 Background Cardiac magnetic resonance (CMR) a new non-invasive imaging technique uses magnetic fields and radiofrequency signals with ECG gating to non-invasively image cardiac function and structure From Hurst s The Heart Chapter 21 Magnetic Resonance Imaging of the Heart. 12 th Edition 2008 McGraw Hill
19 Background CMR can determine the nature of the myocardial tissue this is known as Myocardial Tissue Characterisation There are no studies using CMR to characterise the myocardial tissue in women with preeclampsia
20 Hypothesis We hypothesized that the increased myocardial wall thickness observed with echocardiography in women with pre-eclampsia is due to myocardial oedema and not myocardial muscle
21 Aim We aimed to determine haemodynamics and myocardial structure (presence of oedema) using CMR in healthy pregnant women and in women with pre-eclampsia
22 Method TTE = transthoracic echocardiography
23 Method Modified and upgraded our MRI scanner to perform CMR Upskilled a MRI/CMR radiographer
24 Method Modified and upgraded our MRI scanner to perform CMR Upskilled a MRI/CMR radiographer PLAX PSAX A4C A5C 2D M-Mode Doppler (PW and TDI) (GE Vivid E9)
25 Method Modified and upgraded our MRI scanner to perform CMR Upskilled a MRI/CMR radiographer PLAX PSAX A4C A5C 2D M-Mode Doppler (PW and TDI) (GE Vivid E9) 2 and 4 chamber LVOT orientations left ventricular short-axis (GE Healthcare 3T CMR scanner)
26 Method Modified and upgraded our MRI scanner to perform CMR Upskilled a MRI/CMR radiographer PLAX PSAX A4C A5C 2D M-Mode Doppler (PW and TDI) (GE Vivid E9) 2 and 4 chamber LVOT orientations left ventricular short-axis (GE Healthcare 3T CMR scanner) GE EchoPac Software CMRtools (Cardiovascular Imaging Solutions, UK)
27 Method Modified and upgraded our MRI scanner to perform CMR Upskilled a MRI/CMR radiographer PLAX PSAX A4C A5C 2D M-Mode Doppler (PW and TDI) (GE Vivid E9) 2 and 4 chamber LVOT orientations left ventricular short-axis (GE Healthcare 3T CMR scanner) GE EchoPac Software CMRtools (Cardiovascular Imaging Solutions, UK) Myocardial signal intensities were measured from 16 LV segments (basal (6), mid-chamber(6), apical(4)) and averaged to obtain a global myocardial signal intensity. Myocardial oedema was defined as a myocardial:skeletal tissue intensity ratio of 2.0.
28 Results - Demographics 36 women underwent TTE and CMR (31 healthy pregnant women and 5 women with pre-eclampsia) Characteristic Healthy women Women with pre-eclampsia Age (years) 33 ± ± 3.4 Gestation (weeks) 36 ± ± 5.0 Body mass index (kg.m -1 ) 30 ± ± 2.1
29 Results Haemodynamics and myocardial tissue characteristics Variable Healthy pregnant Women with pre-eclampsia Systolic Blood Pressure (mmhg) 117 ± ± 14.7* Diastolic Blood Pressure (mmhg) 69 ± ± 9.2* LV end-diastolic volume (ml) 130 ± ± 31.5 LV end-diastolic volume index (ml.m -2 ) 65 ± ± 11.5 LV ejection fraction (%) 64 ± ± 6.0 LV mass (g) 127 ± ± 43.8 LV mass index (g.m -2 ) 65.4 ± ± 20.3 RV end-diastolic volume (ml) 131 ± ± 35.5 RV end-diastolic volume index (ml.m -2 ) 67 ± ± 32.4 RV ejection fraction (%) 55 ± ± 7.6 Cardiac output (ml.m -1 ) 6.6 ± ± 1.2 Cardiac index (ml.m -1.m -2 ) 3.4 ± ± 0.56 Heart rate (BPM) 75 ± ± 9.4 Myocardial:skeletal intensity 1.1 ± ± 0.47* Mitral valve E/se (TTE) 7.7 ± ± 1.1* *p<0.05
30 Results Haemodynamics and myocardial tissue characteristics Variable Healthy pregnant Women with pre-eclampsia Systolic Blood Pressure (mmhg) 117 ± ± 14.7* Diastolic Blood Pressure (mmhg) 69 ± ± 9.2* LV end-diastolic volume (ml) 130 ± ± 31.5 LV end-diastolic volume index (ml.m -2 ) 65 ± ± 11.5 LV ejection fraction (%) 64 ± ± 6.0 LV mass (g) 127 ± ± 43.8 LV mass index (g.m -2 ) 65.4 ± ± 20.3 RV end-diastolic volume (ml) 131 ± ± 35.5 RV end-diastolic volume index (ml.m -2 ) 67 ± ± 32.4 RV ejection fraction (%) 55 ± ± 7.6 Cardiac output (ml.m -1 ) 6.6 ± ± 1.2 Cardiac index (ml.m -1.m -2 ) 3.4 ± ± 0.56 Heart rate (BPM) 75 ± ± 9.4 Myocardial:skeletal intensity 1.1 ± ± 0.47* Mitral valve E/se (TTE) 7.7 ± ± 1.1* *p<0.05
31 Results Haemodynamics and myocardial tissue characteristics Variable Healthy pregnant Women with pre-eclampsia Systolic Blood Pressure (mmhg) 117 ± ± 14.7* Diastolic Blood Pressure (mmhg) 69 ± ± 9.2* LV end-diastolic volume (ml) 130 ± ± 31.5 LV end-diastolic volume index (ml.m -2 ) 65 ± ± 11.5 LV ejection fraction (%) 64 ± ± 6.0 LV mass (g) 127 ± ± 43.8 LV mass index (g.m -2 ) 65.4 ± ± 20.3 RV end-diastolic volume (ml) 131 ± ± 35.5 RV end-diastolic volume index (ml.m -2 ) 67 ± ± 32.4 RV ejection fraction (%) 55 ± ± 7.6 Cardiac output (ml.m -1 ) 6.6 ± ± 1.2 Cardiac index (ml.m -1.m -2 ) 3.4 ± ± 0.56 Heart rate (BPM) 75 ± ± 9.4 Myocardial:skeletal intensity 1.1 ± ± 0.47* Mitral valve E/se (TTE) 7.7 ± ± 1.1* *p<0.05
32 CMR 4 chamber view Woman with pre-eclampsia
33 Normal myocardium Healthy pregnant woman Myocardial oedema Woman with pre-eclampsia
34 Healthy pregnant woman LVEF 55% Woman with pre-eclampsia LVEF 75%
35 Conclusions We have established a CMR research program and undertaken the first study of CMR in women with pre-eclampsia Small numbers CMR can quantify haemodynamics and characterise myocardial tissue in healthy pregnant women and in women with preeclampsia
36 Conclusions Our data suggests that women with pre-eclampsia have a different myocardial wall composition and this may be due to oedema not muscle
37 Conclusions Our data suggests that women with pre-eclampsia have a different myocardial wall composition and this may be due to oedema not muscle This may explain the diastolic changes in women with preeclampsia
38 Conclusions Our next steps: Larger study including postpartum scanning Fibrosis studies
39 Acknowledgments Co-investigators Dr Sylvia Chen CMR cardiologist, Ms Liz Leeton, clinical research midwife ANZCA Mundipharma Research Award Royal Women s Hospital Department of Anaesthesia Royal Women s Hospital Department of Radiology Thank you
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