Cardiovascular Journal of Africa最新文献

Objective: The association between pre-operative carotid intima-media thickness (CIMT) and early postoperative acute kidney injury (AKI) following isolated coronary artery bypass grafting (CABG) was investigated.

Methods: Data were sought retrospectively of 237 patients (166 male, 71 female; mean age 61.4 ± 8.1 years; range: 32-74), operated on for isolated CABG with cardiopulmonary bypass (CPB) in a single centre between June 2014 and December 2020, with a serum creatinine level < 1.5 mg/dl and normal carotid arteries on Doppler ultrasonography. AKI diagnosis was made according to the Kidney Disease Improving Global Outcomes 2012 Acute Kidney Injury Guideline. Patients were grouped as group 1 with AKI in the early postoperative period (n = 63) and group 2 without AKI ( n = 174). Univariate analyses were done to determine significant clinical factors, and subsequent multiple logistic regression analysis was done to determine independent predictors of AKI.

Results: AKI occurred in 63 (26.6%) patients. Pre-operative CIMT was significantly higher in the AKI group (p = 0.0001). Multivariate logistic regression analysis revealed that elevated pre-operative CIMT ( p = 0.005), C-reactive protein ( p = 0.001), erythrocyte sedimentation rate ( p = 0.005), neutrophil-lymphocyte ratio ( p = 0.0001) and platelet-lymphocyte ratio ( p = 0.0001) increased on the postoperative seventh day. C-reactive protein ( p = 0.04), postoperative first day platelet- lymphocyte ratio ( p = 0.0001), postoperative seventh day erythrocyte sedimentation rate ( p = 0.02) and intubation time ( p = 0.02) were independent predictors of early postoperative AKI following isolated CABG.

Conclusions: Pre-operative CIMT was found to be an independent predictor of AKI in the early postoperative period of isolated CABG.

Background: The clinical importance and recognition of myocardial infarction with non-obstructive coronary artery disease (MINOCA) is increasing. Nevertheless, no studies are investigating the risk of atrial fibrillation and ventricular arrhythmia in MINOCA patients. This study aimed to determine the risk of arrhythmia with electrocardiographic predictors in MINOCA patients.

Methods: In this study, patients diagnosed with MINOCA and stable out-patients without significant lesions in their coronary arteries were compared. Morphology-voltage-Pwave duration electrocardiography (MPV ECG) score was used to determine atrial arrhythmia risk. QT interval and QT dispersion T_peak-T_end time and T_peak-T_end/QT interval were used to determine ventricular arrhythmia risk.

Results: A total of 155 patients were included in our study. Seventy-seven of these patients were in the MINOCA group. There was no statistically significant difference between the two groups in MPV ECG score (1.95 ± 1.03 vs 1.68 ± 1.14, p = 0.128). P-wave voltage, P-wave morphology and P-wave duration, which are components of the MPV ECG score, were not statistically significantly different. The QRS complex duration (90.21 ± 14.87 vs 82.99 ± 21.59 ms, p = 0.017), ST interval (271.95 ± 45.91 vs 302.31 ± 38.40 ms, p < 0.001), corrected QT interval (438.17 ± 43.80 vs 421.41 ± 28.39, p = 0.005) and QT dispersion (60.75 ± 22.77 vs 34.19 ± 12.95, p < 0.001) were statistically significantly higher in the MINOCA group. The T_peak-T_end (89.53 ± 32.16 vs 65.22 ± 18.11, p < 0.001), T_peak-T_end/QT interval (0.2306 ± 0.0813 vs 0.1676 ± 0.0470, p < 0.001) and T_peak-T_end/corrected QT interval (0.2043 ± 0.6997 vs 0.1551 ± 0.4310, p < 0.001) ratios were also significantly higher in patients with MINOCA.

Conclusions: In the MINOCA patients, there was no increase in the risk of atrial fibrillation based on ECG predictors. However, it was shown that there could be a significant increase in the risk of ventricular arrhythmia. We believe this study could be helpful for specific recommendations concerning duration of hospitalisation and follow up in MINOCA patients.

Objectives: The optimal choice of surgery in coarctation of the aorta (CoA) remains controversial but it needs to be individualised. However, in most conditions, a surgical approach through thoracotomy maintains adequate exposure to create aortic patency. This study aimed to assess the efficiency and reliability of thoracal approaches in the treatment of CoA by examining the mid- and late-term outcomes, and determining the predictive factors for re-intervention.

Methods: Patients who underwent CoA repair through thoracotomy between September 2015 and February 2023 were included in the study, except for those with complex cardiac diseases. Medical records were retrospectively analysed and peri-operative course, follow-up findings on echocardiogram and physical examinations were obtained. The complication rate, postoperative arch gradient, need for antihypertensive medication use, and freedom from re-intervention were evaluated and then compared in terms of age at surgery.

Results: Overall, 98 patients including 50 neonates were reviewed. The most common surgical method was extended end-to-end anastomosis, performed in 53 patients. The median follow-up time was 4.6 years. There was one death in hospital and one late mortality in the cohort. Eight complications were observed in the cohort but all recovered well. Overall, 13 re-interventions, six redo surgeries and seven balloon angioplasties were carried out in 12 patients. Ten of the re-interventions were carried out within the first year of the initial surgery. One- and three-year freedom from re-intervention rates were 89.5 and 86.4%, respectively. However, there was no significant predictive factor for re-intervention. Comparisons according to the age at surgery did not differ, except for intensive care unit stay. The need for hypertensive medication was initially in 14 (14.2%) patients and then reduced to eight (8%) patients. The mean peak residual gradient on postoperative examination was 9 mmHg.

Conclusion: Thoracotomy provided feasible surgical access that led to satisfactory results with a low complication rate, negligible residual gradient, low incidence of hypertension and excellent rate for freedom from re-intervention in the treatment of CoA.

Background: Cardiovascular disease is the leading cause of mortality worldwide, with dyslipidaemia being one of the major risk factors. Point-of-care testing (POCT) allows for the rapid measurement of serum lipids. The aim of this study was to assess the accuracy of serum lipid measurement by the Fujifilm^™ NX700 POCT compared to a gold-standard clinical laboratory method (Medpace, Leuven, Belgium).

Methods: This was a prospective, observational study conducted at the Lipid Clinic at Charlotte Maxeke Johannesburg Academic Hospital from July to September 2022. Participants were known to have a lipid disorder, most commonly, familial hypercholesterolaemia. Samples sent for lipid measurement by standard laboratory methods were simultaneously measured by the Fujifilm^™ NX700 POCT.

Results: Lipograms evaluating total cholesterol (TC), triglycerides (TG), high-density lipoprotein cholesterol (HDL-C) and calculated low-density lipoprotein cholesterol (LDL-C) were obtained from 115 participants. No statistically significant difference was noted between the parameters tested on the different platforms. The Fujifilm^™ NX700 POCT correctly identified > 91% of serum lipid results as normal or abnormal, as defined by NCEP-ATP III criteria, and exhibited good sensitivity and specificity for each parameter. Lin's concordance correlation coefficient demonstrated a strong correlation for all parameters; TC (ρ_c = 0.9861), HDL-C (ρ_c = 0.95919), LDL-C (ρ_c = 0.98134) and TG (ρ_c = 0.92775). Bland-Altman plots identified low bias and a good level of agreement between the two test methods.

Conclusion: The Fujifilm^™ NX700 POCT compared favourably with gold-standard laboratory methods in the determination of serum lipid measurements, allowing for rapid screening at the primary healthcare level.

Background: Lipoprotein(a) [Lp(a) ] is associated with coronary artery disease due to its atherogenic and thrombogenic nature. In this study, we aimed to compare the level of Lp(a) in young and middle-aged patients with ST-elevation myocardial infarction (STEMI).

Methods: This retrospective study included 287 patients aged 20-65 years who presented to the emergency department for the first time due to STEMI. The patients were divided into two groups: 20-45 years (young group, n = 111) and 46-65 years (middle-aged group, n = 176). The groups were compared in terms of demographic characteristics, co-morbidities and laboratory findings.

Results: In the young group, smoking (99, 89.2% vs 130, 73.9%; p = 0.001), family history of coronary artery disease (75, 67.6% vs 80, 45.5; p < 0.001), serum Lp(a) level [38.1 ± 27.9 (93 ± 68) vs 23.5 ± 23.2 mg/dl (57 ± 56 nmol/l); p < 0.001], triglyceride level [219.1 ± 231.9 (2.48 ± 2.62) vs 170.2 ± 105.6 mg/dl (1.92 ± 1.19 mmol/l); p = 0.018), ejection fraction (52.4 ± 6.1 vs 47.2 ± 7.7%; p = 0.004) and single-vessel disease (83, 74.8% vs 110, 62.5%; p = 0.031) were higher than in the middle-aged group. In multivariable logistic regression analyses, family history (OR: 2.073, 95% CI: 1.210-3.549; p = 0.008), low high-density lipoprotin cholesterol level (OR: 1.032, 95% CI: 1.003-1.062; p = 0.029) and Lp(a) elevation (OR: 1.981, 95% CI: 1.871-3.991; p < 0.001) were possible independent risk factors for STEMI in young patients.

Conclusion: Lp(a) level was found to be a higher and a possible independent risk factor in young patients who presented with STEMI for the first time, compared to the middle-aged patient group. Lp(a) is a highly atherogenic molecule and it has been associated with stroke, heart failure, aortic stenosis, as well as coronary artery disease. Measurement of Lp(a) levels may be recommended in young patients with high cardiovascular risk.

Introduction: Single-ventricle physiology is a critical cardiac condition requiring early diagnosis and intervention. The objectives of this study were to report on the management and outcomes of patients diagnosed with single-ventricle physiology in central South Africa.

Methods: This study was a retrospective, observational analysis of patients presenting with single-ventricle physiology at the Universitas Academic Hospital in central South Africa between November 1997 and June 2021.

Results: Patients were referred from the Free State (54%) and Northern Cape (29%) provinces and Lesotho. One hundred and fifty-four patients presented with single-ventricle physiology: 114 received interventions and 40 were not eligible for intervention. Patients presented for the first time at a median age of 34.5 days, with patients from nearby districts presenting within a few days of birth. However, patients from outlying areas presented much later. Eighty-seven patients received systemic-to-pulmonary artery shunting or pulmonary artery banding. Sixty-three patients proceeded to bidirectional Glenn procedures, and 30 patients (26%) had full palliation to Fontan. Twenty-one patients died after stage 1, six after the Glenn procedure and two after the Fontan procedure. Overall, 34 (29.8%) patients were lost to follow up.

Conclusion: Patients in our study presented late and follow up of these patients was a challenge. The highest mortality rate occurs during the first stage of palliation. Outcomes from this study are comparable to other sub-Saharan studies.

Aim: The aim of this study was to investigate the value of partial oxygen pressure (PO₂) changes measured in the left atrium (LA) during transient pulmonary vein (PV) closure in patients undergoing cryoablation and its relationship with the diameter of the closed PV.

Methods: The study was carried out on a total of 25 cases. The grouping of PVs was made separately as the left superior, left inferior, left common, right superior, right inferior, right common and total PVs. PV measurement was made from angiographic images obtained after the cryoablation balloon was inflated and opaque. From the LA, the difference between the PO₂ values in the blood gases obtained before and during the temporary closure of each PV was evaluated as the PO₂ change. The difference of the lowest temperature reached during the closing of each PV from -36°C was termed the heat difference. The relationship of PO₂ change with PV diameter and the heat difference were investigated.

Results: There was no significant relationship between any of the PV diameters and PO₂ changes (p > 0.05). There was a significant relationship between heat differences and PO₂ changes in the left superior (p = 0.011), right superior (p = 0.049), right 'common' (p = 0.037) and total PVs (p = 0.001), but there was no significant relationship between heat differences and PO₂ changes in the left inferior, left 'common' and right inferior PVs (p > 0.05).

Conclusion: In the light of these data, PO₂ change could demonstrate the success of cryoablation, and was related with the cooling degree, but not with the PV diameter.

Background: The diagnostic and therapeutic efforts instituted by the state of Senegal since the results of the STEPwise survey in 2015 could and should be reinforced with an effective and targeted preventative approach against cardiovascular accidents. This study aimed to (1) identify the pathological population that contains the most incidents of stroke in Senegal, (2) identify the prevalence, and geographical and gender distribution of biological co-morbidities with hypertension, stroke and advice for a change in behaviour, and (3) research the factors associated with the occurrence of cardiovascular accidents specific to the Senegalese context.

Methods: This was a secondary analysis of the STEPwise WHO Senegal 2015 survey: a descriptive quantitative epidemiological study with an analytical aim.

Results: Biological co-morbidities with arterial hypertension as well as cardiovascular accidents affected more women than men. Biological co-morbidities with arterial hypertension predominated in urban areas, while cardiovascular accidents were more common in rural areas. The population with arterial hypertension and total hypercholesterolaemia simultaneously was at the top of a list of 25 pathological populations in terms of the proportion of cardiovascular accidents within them. In addition, total hypercholesterolaemia was found in the first three populations with the most cardiovascular accidents. Regarding advice for behavioural change, advice for smoking cessation was the most widespread. All advice was given mostly to the gender most affected by the health problem, but some advice was mostly addressed to the environment least affected by the problem. Therefore, despite being the most affected, the rural environment received the least advice for a change in behaviour with regard to the practice of any of the forms of the physical activities described, the consumption of oil of palm, the consumption of cubed sugar or sugary drinks, smoked and non-smoked tobacco and attempted smoking cessation. In multivariate analysis, it was found that arterial hypertension produced a 2.74 times greater risk of having a cardiovascular accident (adjusted odds ratio = 2.74; 95% confidence interval = 1.88-3.99; p < 0.001).

Conclusion: In Senegal, we need to pay more attention to arterial hypertension, dyslipidaemia, women and the rural environment in our ongoing fight against cardiovascular diseases and their risk factors.

Objective: We planned to reveal the relationship between OPG (osteoprotegerin) level and right heart function in hypertensive patients with normal ejection fraction, using strain analysis, which is a sensitive method in demonstrating subclinical dysfunction.

Methods: Between February and June 2018, 625 consecutive patients with a diagnosis of hypertension who applied to the cardiology out-patient clinic of our hospital were evaluated for our study and 175 eligible patients were included. The patients were divided into two groups according to their OPG level. Strain analysis was performed in the echocardiographic evaluation.

Results: The mean OPG value was 6.33 ± 1.87 pg/l. There were 93 patients (age 51.1 ± 8.5 years) in the low OPG group and 82 patients (age 54.6 ± 10.4 years) in the high OPG group. A significant difference was found between the two groups with regard to age (p = 0.016), statin use (p = 0.026), C-reactive protein level (p = 0.048), office systolic blood pressure (SBP) (p = 0.001) and office diastolic blood pressure (DBP) (p = 0.001). A significant difference was found between values of strain during reservoir phase (RASr) (p = 0.01), strain during conduit phase (RAScd) (p < 0.001) and peak strain rate during reservoir phase (pRASRcd) (p = 0.044). In multivariate regression analysis, age (OR: 1.162, 95% CI: 1.064-1.269, p = 0.001), office DBP (OR: 1.089, 95% CI: 1.020-1.161, p = 0.011) and RAScd (OR: 0.890, 95% CI: 0.815-0.972, p < 0.010) were found to be independent predictors of high OPG.

Conclusions: In our study, we found high OPG level was inversely correlated with right atrial strain values and linearly associated with high blood pressure. In order to take advantage of the negative indicators of high OPG, positive results can be obtained in strain values of the right heart by indirectly reducing the afterload of the right heart. This can be done by reducing high systemic blood pressure and providing tight blood pressure control.