| 1. |
- Emilsson, Kent, 1963-, et al.
(författare)
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Comparison between maximal early diastolic velocity in long-axis direction obtained by M-mode echocardiography and by tissue Doppler in the assessment of right ventricular diastolic function
- 2005
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Ingår i: Clinical Physiology and Functional Imaging. - Oxford : Blackwell. - 1475-0961 .- 1475-097X. ; 25:3, s. 178-182
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Tidskriftsartikel (refereegranskat)abstract
- Recently the maximal early diastolic velocity in long-axis direction of the right ventricle (RV) obtained by tissue Doppler imaging (MDV TDI) has been introduced in the assessment of RV diastolic function (RVDF). There are reasons to think that also the maximal early diastolic velocity in long-axis direction of the RV obtained using M-mode echocardiography (MDV TAM) could be used to assess RVDF. Therefore, 29 patients were examined with echocardiography and MDV TAM and MDV TDI were measured and compared. A good correlation (r = 0.76, P< 0.001) was found between MDV TAM and MDV TDI indicating that MDV TAM might be used in the assessment of RVDF. However, the velocities obtained by MDV TDI (126.7 &PLUSMN; 38.9 mm s(-1)) were significantly (P< 0.001) higher than the velocities obtained by MDV TAM (78.3 &PLUSMN; 27.8 mm s(-1)) and the agreement between MDV TAM and MDV TDI was rather poor probably mainly due to differences in the measuring technique. This means that reference values cannot be used interchangeably between MDV TAM and MDV TDI. If MDV TAM is going to be used in the assessment of RVDF new reference values have to be produced if today's technique and recommendations to measure MDV TAM and MDV TDI are used. However, as most new echocardiographs are equipped with PW-TDI technology it seems preferable to use this technique and compare obtained values with already established reference values.
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| 2. |
- Emilsson, Kent, 1963-, et al.
(författare)
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Isovolumetric relaxation time of the right ventricle assessed by tissue Doppler imaging
- 2004
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Ingår i: Scandinavian Cardiovascular Journal. - Oslo : Taylor& Francis. - 1401-7431 .- 1651-2006. ; 38:5, s. 278-282
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Tidskriftsartikel (refereegranskat)abstract
- Objectives-The isovolumetric relaxation time of the right ventricle (RV-IVRT) can be assessed using a method based on ECG and pulsed wave Doppler (PW). Recently pulsed wave Doppler tissue imaging (PW-DTI) has been introduced in the assessment.Design-RV-IVRT obtained by the two methods was compared in 20 consecutive patients as was the time from the R wave on the ECG to the onset of tricuspid flow (R-T), to the closure of the pulmonic valve (R-P), to the onset of early diastolic motion of the tricuspid annulus tissue (R-E) and to the end of the systolic motion (R-S).Results-RV-IVRT obtained by the PW method was significantly (p<0.001) shorter than RV-IVRT obtained by PW-DTI. R-S had significantly (p<0.001) shorter duration than R-P, while there was no significant difference between R-E and R-T.Conclusions-The methods are not measuring the same interval. Only the PW method measures RV-IVRT according to the usual definition. Different reference values have to be used if the methods are used in the assessment of RV diastolic function.
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| 3. |
- Kumar, Sanjay, et al.
(författare)
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Diastolic function improves after resolution of takotsubo cardiomyopathy
- 2016
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Ingår i: Clinical Physiology and Functional Imaging. - : Wiley-Blackwell. - 1475-0961 .- 1475-097X. ; 6:1, s. 17-24
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Takotsubo cardiomyopathy (TTC) is a condition of reversible left ventricular (LV) systolic dysfunction. However, the diastolic function (DF) manifestations of TTC have not been widely investigated. We performed a bicentric study with retrospective analysis of DF in patients with TTC, during onset and at follow-up.METHODS: Twenty-eight patients with TTC (64 ± 10 years, F 24) were included. All underwent echocardiograms acutely and at the recovery phase (average three months later). Diastolic and systolic function parameters were recorded, including E-wave velocity (E), A-wave velocity, E/A ratio, relaxation (e') and contractility (S') based on tissue Doppler velocities of the mitral annuli, ejection fraction (EF), left atrial (LA) size and DF stages.RESULTS: Recovery, including the mean difference with 95% confidence interval, was associated with tending improvement (i.e. uncorrected significance) in E [13 cm s(-1) (-24, -2·3), P = 0·02] and in E/A ratio [0·2 (-0·41, -0·02), P = 0·04], as well as significant improvement (after multiple comparison correction) in mean e' [2·0 cm s(-1) (-3·3, -1·2), P<0·001] and in A-wave duration [29 ms (-46·7, -12·7), P = 0·002]. LA area tended to decrease during recovery [-2 cm² (0·33, 2·4), P = 0·01]. Improvement in DF stages was significant between the phases (21% versus 58% defined as normal DF, P = 0·016). Improvement in LVEF correlated with improvement in mean e' (r = 0·52, P = 0·02).CONCLUSIONS: TTC is associated with an acute impairment of conventional DF variables, which improves during recovery. DF recovery seems to occur in parallel with systolic recovery in patients with TTC.
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| 4. |
- Loiske, Karin, 1978-, et al.
(författare)
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A comparison of right ventricular volume change during systole obtained using the monoplane Simpson's method in two-dimensional echocardiographic apical four-chamber view with right ventricular volume change obtained using a prisma model reflecting the systolic long-axis shortening of the right ventricle of the heart : a pilot study
- 2008
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Ingår i: Experimental and clinical cardiology. - Oakville, Ont. : Pulsus Group. - 1205-6626. ; 13:2, s. 75-78
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Forskningsöversikt (refereegranskat)abstract
- The right ventricle of the heart has a complex geometry, making it difficult to measure its function and volume. In the present study, right ventricular (RV) volume change during systole in two-dimensional echocardiographic apical four-chamber view was estimated using the monoplane Simpson's method. Measurements of volume change using the monoplane Simpson's method were compared with those obtained using a theoretical prisma model, which is believed to reflect RV systolic long-axis shortening. The mean volume change during systole obtained using the theoretical prisma model (10.2+/-3.2 mL) was significantly (P<0.001) smaller than that obtained using the monoplane Simpson's method (20.7+/-7.1 mL). This difference was probably due to the patient group studied, which had a mean (+/- SD) age of 58.6+/-14.1 years. In elderly individuals, systolic shortening in the short-axis direction has a greater impact on volume change during the heart cycle more than in younger individuals. However, not even the volume change during systole obtained using the monoplane Simpson's method in echocardiographic four-chamber view was able to determine the 'real' RV stroke volume. Thus, the volume change during systole in other echocardiographic views needs to be considered as well.
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| 5. |
- Loiske, Karin, 1978-
(författare)
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Echocardiographic measurements of the heart : with focus on the right ventricle
- 2011
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Echocardiography is a well established technique when evaluating the size and function of the heart. One of the most common ways to measure the size of the right ventricle (RV) is to measure the RV outflow tract 1(RVOT1). Several ways to measure RVOT1 are described in the literature.These ways were compared with echocardiography on 27 healthy subjects.The result showed significant differences in RVOT1, depending on the way it was measured, concluding that the same site, method and body positionshould be used when comparing RVOT1 in the same subject over time.One parameter to evaluate the RV diastolic function (RVDF) is to measure the RV isovolumetric relaxation time (RV-IVRT), a sensitive marker ofRV dysfunction. There are different ways to measure this. In this thesis two ways of measuring RV-IVRT and their time intervals were compared in 20 patients examined with echocardiography. There was a significant difference between the two methods indicating that they are not measuring the same interval.Another way to assess the RVDF is to measure the maximal early diastolicvelocity (MDV) in the long-axis direction. MDV can be measured bydifferent methods, hence 29 patients were examined and MDV was measured according to two methods. There was a good correlation but a poor agreement between the two methods meaning that reference values cannot be used interchangeably.Takotsubo cardiomyopathy is characterized by apical wall motion abnormalities without coronary stenosis. The pathology of this condition remains unclear. To evaluate biventricular changes in systolic long-axisfunction and diastolic parameters in the acute phase and after recovery, 13 patients were included and examined with echocardiography at admission and after recovery. The results showed significant biventricular improvementof systolic long-axis function while most diastolic parameters remainedunchanged.
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| 6. |
- Loiske, Karin, 1978-, et al.
(författare)
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Echocardiographic measurements of the right ventricle : right ventricular outflow tract 1
- 2010
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Ingår i: Clinical research in cardiology. - Berlin : Springer. - 1861-0684 .- 1861-0692. ; 99:7, s. 429-435
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Tidskriftsartikel (refereegranskat)abstract
- The size of the ventricles of the heart is important to establish during the clinical echocardiographic examination. Due to the complex anatomy of the right ventricle, it is difficult to measure its size at times. One of the most frequently used ways is to measure the right ventricular outflow tract (RVOT1), probably due to its good reproducibility. However, in the literature different ways are described to measure RVOT1, both at different sites and using different methods such as M-mode and 2D. The first aim of the present study was to exam if there is a significant difference in the outcome of RVOT1 using different sites and methods to measure it. The second aim was to study if there is a significant difference between the usually preferred left lateral decubitus position during the echocardiographic examination and the supine decubitus position, which the echocardiographer sometimes can be compelled to use if the patient is unable to lie in the left lateral decubitus position
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| 7. |
- Loiske, Karin, 1978-, et al.
(författare)
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Left and right ventricular systolic long-axis function and diastolic function in patients with takotsubo cardiomyopathy
- 2011
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Ingår i: Clinical Physiology and Functional Imaging. - Oxford : Wiley. - 1475-0961 .- 1475-097X. ; 31:3, s. 203-208
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Tidskriftsartikel (refereegranskat)abstract
- Aims: Takotsubo cardiomyopathy is characterized by apical wall motion abnormalities without coronary stenosis. Limited information is available on the genesis of the underlying reversible contractile disorder. Our objective in this prospective study was to investigate biventricular changes in systolic long-axis function and diastolic parameters in the acute phase and after recovery.Methods and results: Thirteen consecutive patients were examined by echocardiography and coronary angiography at admission and again by echocardiography after 3 months. Amplitudes, systolic and diastolic velocities of the mitral and tricuspid annuli and conventional diastolic parameters were measured. Systolic long-axis shortening of the left ventricle (LV) and right ventricle (RV) improved from 9·6 ± 2·2 mm to 11·2 ± 1·9 mm (P = 0·02) and from 21·3 ± 3·6 mm to 24·1 ± 2·8 mm (P = 0·02), respectively. LV systolic, early and late diastolic velocities measured by pulsed-wave tissue Doppler also improved, while additional conventional diastolic parameters of the LV and RV diastolic function were unchanged.Conclusions: Takotsubo cardiomyopathy temporarily affects systolic LV and RV function, while most diastolic parameters remain unchanged
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