Stress-Radionuclide Ventriculography in the Evaluation of CABG Patients

1984 ◽  
pp. 211-215
Author(s):  
L. Fridrich ◽  
A. Gaszner ◽  
M. Pichler
Keyword(s):  
Radionuclide Ventriculography ◽  
Cabg Patients

Effects of Rest and Exercise on Cardiac Blood Volume Determinations

1997 ◽  
Vol 36 (08) ◽  
pp. 259-264
Author(s):  
N. Topuzović
Keyword(s):  
Radionuclide Ventriculography ◽  
Left Ventricular ◽  
Peak Exercise ◽  
Volume Determination ◽  
Group I ◽  
Lv Volumes ◽  
Group Ii ◽  
Lv Volume

Summary Aim: The purpose of this study was to investigate the changes in blood activity during rest, exercise and recovery, and to assess its influence on left ventricular (LV) volume determination using the count-based method requiring blood sampling. Methods: Forty-four patients underwent rest-stress radionuclide ventriculography; Tc-99m-human serum albumin was used in 13 patients (Group I), red blood cells was labeled using Tc-99m in 17 patients (Group II) in vivo, and in 14 patients (Group III) by modified in vivo/in vitro method. LV volumes were determined by a count-based method using corrected count rate in blood samples obtained during rest, peak exercise and after recovery. Results: In group I at stress, the blood activity decreased by 12.6 ± 5.4%, p <0.05, as compared to the rest level, and increased by 25.1 ± 6.4%, p <0.001, and 12.8 ± 4.5%, p <0.05, above the resting level in group II and III, respectively. This had profound effects on LV volume determinations if only one rest blood aliquot was used: during exercise, the LV volumes significantly decreased by 22.1 ± 9.6%, p <0.05, in group I, whereas in groups II and III it was significantly overestimated by 32.1 ± 10.3%, p <0.001, and 10.7 ± 6.4%, p <0.05, respectively. The changes in blood activity between stress and recovery were not significantly different for any of the groups. Conclusion: The use of only a single blood sample as volume aliquot at rest in rest-stress studies leads to erroneous estimation of cardiac volumes due to significant changes in blood radioactivity during exercise and recovery.

New Hybrid Method for Left Ventricular Ejection Fraction Assessment from Radionuclide Ventriculography Images

2020 ◽  
Vol 16 ◽  
Author(s):  
Halima Dziri ◽  
Mohamed Ali Cherni ◽  
Dorra Ben Sellem
Keyword(s):  
Left Ventricular Ejection Fraction ◽  
Left Ventricle ◽  
Ejection Fraction ◽  
Positive Predictive Value ◽  
Roc Curve ◽  
Radionuclide Ventriculography ◽  
Left Ventricular ◽  
The Other ◽  
Left Ventricular Ejection ◽  
Ventricular Ejection Fraction

Background: In this paper, we propose a new efficient method of radionuclide ventriculography image segmentation to estimate the left ventricular ejection fraction. This parameter is an important prognostic factor for diagnosing abnormal cardiac function. Methods: The proposed method combines the Chan-Vese and the mathematical morphology algorithms. It was applied to diastolic and systolic images obtained from the Nuclear Medicine Department of Salah AZAIEZ Institute.In order to validate our proposed method, we compare the obtained results to those of two methods of the literature. The first one is based on mathematical morphology, while the second one uses the basic Chan-Vese algorithm. To evaluate the quality of segmentation, we compute accuracy, positive predictive value and area under the ROC curve. We also compare the left ventricle ejection fraction estimated by our method to that of the reference given by the software of the gamma-camera and validated by the expert, using Pearson’s correlation coefficient, ANOVA test and linear regression. Results and conclusion: Static results show that the proposed method is very efficient in the detection of the left ventricle. The accuracy was 98.60%, higher than that of the other two methods (95.52% and 98.50%). Likewise, the positive predictive value was the highest (86.40% vs. 83.63% 71.82%). The area under the ROC curve was also the most important (0.998% vs. 0.926% 0.919%). On the other hand, Pearson's correlation coefficient was the highest (99% vs. 98% 37%). The correlation was significantly positive (p<0.001).

scholarly journals Cerebral microbleed distribution following cardiac surgery can mimic cerebral amyloid angiopathy

2021 ◽  
Vol 3 (2) ◽  
pp. e000166
Author(s):  
Michele De Sciscio ◽  
Paul De Sciscio ◽  
Wilson Vallat ◽  
Timothy Kleinig
Keyword(s):  
Cardiac Surgery ◽  
Valve Replacement ◽  
Cerebral Amyloid Angiopathy ◽  
Artery Bypass ◽  
Area Under The Curve ◽  
Subcortical White Matter ◽  
Amyloid Angiopathy ◽  
Receiver Operator Curve Analysis ◽  
Cerebral Amyloid ◽  
Cabg Patients

Background and aimsHaving anecdotally noted a high frequency of lobar-restricted cerebral microbleeds (CMBs) mimicking cerebral amyloid angiopathy (CAA) in patients with previous cardiac surgery (especially valve replacement) presenting to our transient ischaemic attack (TIA) clinic, we set out to objectively determine the frequency and distribution of microbleeds in this population.MethodsWe performed a retrospective comparative cohort study in consecutive patients presenting to two TIA clinics with either: (1) previous coronary artery bypass grafting (CABG) (n=41); (2) previous valve replacement (n=41) or (3) probable CAA (n=41), as per the Modified Boston Criteria, without prior cardiac surgery. Microbleed number and distribution was determined and compared.ResultsAt least one lobar-restricted microbleed was found in the majority of cardiac surgery patients (65%) and 32/82 (39%) met diagnostic criteria for CAA. Valve replacement patients had a higher microbleed prevalence (90 vs 51%, p<0.01) and lobar-restricted microbleed count (2.6±2.7 vs 1.0±1.4, p<0.01) than post-CABG patients; lobar-restricted microbleed count in both groups was substantially less than in CAA patients (15.5±20.4, p<0.01). In postcardiac surgery patients, subcortical white matter (SWM) microbleeds were proportionally more frequent compared with CAA patients. Receiver operator curve analysis of a ‘location-based’ ratio (calculated as SWM/SWM+strictly-cortical CMBs), revealed an optimal ratio of 0.45 in distinguishing cardiac surgery-associated microbleeds from CAA (sensitivity 0.56, specificity 0.93, area under the curve 0.71).ConclusionLobar-restricted microbleeds are common in patients with past cardiac surgery, however a higher proportion of these CMBs involve the SWM than in patients with CAA.

Factors associated with return to work after coronary artery bypass grafting (CABG)

2021 ◽  
Vol 28 (Supplement_1) ◽  
Author(s):  
A Raynaldo
Keyword(s):  
Diabetes Mellitus ◽  
Logistic Regression ◽  
Coronary Artery ◽  
Return To Work ◽  
Coronary Artery Bypass ◽  
Functional Capacity ◽  
Artery Bypass ◽  
Bypass Graft ◽  
Factors Associated ◽  
Cabg Patients

Abstract Funding Acknowledgements Type of funding sources: None. Background. Postoperative CABG patients will generally experience improvement in symptoms and functional capacity. Post-CABG patients are expected to be productive again in order to have a positive impact on both patient and the society socio-economically, in addition to other parameters such as morbidity, mortality and serious adverse events. Purpose to determine the factors that associated with return to work in CABG patients in one General Hospital. Methods. We analyzed data from Adam Malik Hospital registry of 68 patients who had undergone CR after coronary artery bypass graft (CABG) in 2017-2020. The outcomes assessed were work status in 6 month after CABG. Patients’ characteristics, sociodemographic, clinical parameters of functional capacity using 6 minutes of walk test (6MWT), T2DM, Hypertension and cholesterol level were assessed. Factors associated with return to work were identified using multivariable logistic regression. Results We identified 68 patients undergoing isolated CABG (2017–2020). One year after discharge for CABG, 40 (58.8%) patients had returned to the workforce. Factors associated with return to work  were identified using bivariate logistic regression. Diabetes mellitus (odds ratio, 10.192; 95% confidence interval, 0.063–0.515). Conclusion Almost 2 from 3 patients after CABG returned to work within 6 months. Diabetes mellitus and functional capacity were associated with a lower likelihood of returning to work.

scholarly journals The beneficial effects of physical preoperative and postoperative training for the cognitive function in cardiosurgical patients

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
O Trubnikova ◽  
I Tarasova ◽  
E Moskin ◽  
Y Argunova ◽  
D Kupriyanova ◽  
...  
Keyword(s):  
Cardiac Surgery ◽  
Cognitive Function ◽  
Physical Training ◽  
Training Group ◽  
Aerobic Exercise Training ◽  
Funding Source ◽  
Beneficial Effects ◽  
Preoperative Training ◽  
Cabg Patients ◽  
Cycling Training

Abstract Background and aim The cardiac surgery patients have an increased risk of postoperative cognitive dysfunction (POCD). The positive healing effects of physical exercise was demonstrated early in patients with cognitive impairment. The aim of the study was to evaluate the effect of physical preoperative and postoperative training for the cognitive function in patients undergoing on-pump coronary artery bypass grafting (CABG). Methods We analyzed the neurophysiological data from 125 male coronary artery disease (CAD) patients who participated in two sub-studies: the patients with a short preoperative course of treadmill training (n=33) and with postoperative aerobic exercise training (n=92). The study of preoperative physical training included CABG-candidates, which were divided into 2 groups: with (n=17) and without training (n=16). The preoperative physical training consisted of a 5–7 day course of intensive training on a treadmill. The study with postoperative aerobic exercise training enrolled CAD patients, undergoing on-pump CABG, which were divided into 2 groups: with supervised cycling training (n=39) and without training (n=53). Three-week trainings course began on the 14-th day after CABG. The patients with and without preoperative and postoperative physical training were comparable in terms of preoperative characteristics and intraoperative parameters. The patients were underwent the neuropsychological and EEG examination to assess postoperative changes in neurophysiological performance. Results The patients with preoperative treadmill training had the POCD incidence at 7–10 days after GABG in 44% cases vs. 74% - in the group without training. The relative risk of POCD developing in the patients with preoperative training was: OR=0.24, 95% CI: 0.07–0.81, Z=2.297, p=0.02. Additionally, the patients with preoperative training demonstrated a lower power in the theta (4–6 Hz) and beta1 (13–20 Hz) frequency ranges 7–10 days after CABG. The patients with postoperative cycling training also demonstrated better cognitive function at 1 month after CABG compared to the patients without training. The incidence of POCD was 21% in the cycling training group vs. 44% – in the group without training. The relative risk of POCD developing was: OR=0.23, 95% CI: 0.09–0.60, Z=3.041, p=0.0024. Also, it was found that the postoperative cycling training group showed a lower percentage theta power increase at 1 month after CABG. Conclusion Both the short preoperative and three-week postoperative physical training course can produce beneficial effects on the postoperative neurophysiological status in CABG patients. The engagement of physical training in the rehabilitation program of CABG patients can improve cognitive functioning after cardiac surgery. Funding Acknowledgement Type of funding source: Foundation. Main funding source(s): RFBR and Kemerovskaya region

scholarly journals Prognostic utility of early systolic lengthening by speckle tracking in patients undergoing coronary artery bypass graft

2021 ◽  
Vol 22 (Supplement_1) ◽  
Author(s):  
P Brainin ◽  
S Lindberg ◽  
F Olsen ◽  
S Pedersen ◽  
A Iversen ◽  
...  
Keyword(s):  
Coronary Artery ◽  
Coronary Artery Bypass Graft ◽  
Speckle Tracking ◽  
Prognostic Value ◽  
Artery Bypass ◽  
Bypass Graft ◽  
Artery Bypass Graft ◽  
Positive Strain ◽  
All Cause Mortality ◽  
Cabg Patients

Abstract Funding Acknowledgements Type of funding sources: Public grant(s) – National budget only. Main funding source(s): The Independent Research Fund Denmark Background Early systolic lengthening (ESL), a paradoxical stretch of myocardial fibers, has been linked to myocardial viability and contractile dysfunction. We assessed the long-term prognostic potential of ESL in coronary artery bypass graft (CABG) patients. Methods We retrospectively included patients (n = 709; mean age 68 years; 85% men) who underwent speckle tracking echocardiography (median 15 days) prior to CABG. Endpoints were cardiovascular death (CVD) and all-cause mortality. We assessed amplitude of ESL (%), defined as peak positive strain, and duration of ESL (ms), determined as time from Q-wave on the ECG to peak positive strain. We applied Cox proportional hazards models adjusted for the clinical risk tool, EuroSCORE II. Results During median follow-up of 3.8 years [IQR 2.7 to 4.9 years], 45 (6%) experienced CVD and 80 (11%) died. In survival analyses adjusted for EuroSCORE II, amplitude of ESL was associated with CVD (HR 1.37 [95%CI 1.13 to 1.66], P = 0.001) and all-cause mortality (HR 1.31 [95%CI 1.13 to 1.54], P = 0.001). Similar findings applied to duration of ESL and CVD (HR 1.17 [95%CI 1.08 to 1.26], P &lt; 0.001) and all-cause mortality (HR 1.14 [95%CI 1.07 to 1.21], P &lt; 0.001). The prognostic value of ESL amplitude was modified by sex (P interaction &lt; 0.05), such that it was greater in women for both endpoints (Figure 1A-B). When adding ESL duration to EuroSCORE II, the net reclassification index improved significantly for both CVD and all-cause mortality. Conclusions Assessment of ESL provides independent and incremental prognostic information in addition to the EuroSCORE II for CVD and all-cause mortality in CABG patients. The prognostic value was greater in women. Abstract Figure. Prognostic value of ESL amplitude by sex

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