The growth of CVD care infrastructure and human resources in the African region has yet to match up with the increasing burden of these diseases, and budget allocations in many of these countries still prioritise communicable diseases [17]. In this study, we shed light on the quality of ACS care offered in a tertiary hospital in northern Ghana using the 2017 AHA/ACC clinical performance and quality measures guidelines for adults myocardial infarction as a yardstick [19]. This guideline is intended to provide healthcare practitioners and their institutions with tools to assess the quality of care delivered and identify opportunities for improvement. The domains assessed include effective clinical care, patient safety, communication, coordination, efficiency, cost reduction and public health [19]. It is believed that implementing these measures by healthcare providers and facilities will ultimately improve the quality of care and outcomes of patients with acute myocardial infarction [19].
Atherosclerotic plaque disruption and superimposed platelet-rich thrombus formation are the main pathophysiological mechanisms causing ACS. Aspirin inhibits the formation of thromboxane A2, a potent platelet aggregation stimulator. In the Second International Study of Infarct Survival (ISIS-2) trial, aspirin therapy within the first 24 h after STEMI resulted in a 23% relative risk reduction in 5-week cardiovascular mortality [22]. The use of P2Y12 receptor inhibitors has incremental benefits to aspirin, and dual antiplatelet therapy has become the mainstay treatment strategy after ACS as this is associated with improved cardiovascular outcomes [23–25]. Compliance with prescribing aspirin or P2Y12 inhibitors at discharge was high. The lower rates of aspirin prescriptions within 24 hours of arrival could be attributed to delays in establishing the diagnosis of ACS, especially NSTEMI or UA. We observed that the median time to obtain cardiac troponin measurements was 24 hours (IQR 15–24 hours). Out-of-pocket payment for these tests, as well as system delays, are contributory. A rise or fall in cardiac troponins is essential to diagnose acute myocardial infarction in the correct clinical setting [26]. Whilst STEMI is usually readily diagnosed on ECG, patients with NSTEMI may present with nonspecific ECG changes making the timely measurement of troponin levels essential in the early diagnosis and risk stratification of these patients.
Despite the documented benefits of these medications in all patients with ACS, only about two-thirds of the patients in this study were discharged on a beta blocker or a high-intensity statin. Oral beta blockers also reduce cardiac automaticity and the risk of ventricular fibrillation following a myocardial infarction, in addition to their anti-ischemic and anti-anginal properties [27]. Statins, on the other hand, delay coronary atherosclerosis progression and can induce plaque regression and reduce cardiovascular events, including recurrent myocardial infarction, cerebrovascular events, and all-cause mortality [28]. These medications are now available as generics making them easily accessible and affordable. Their coverage under the Ghana National Health Insurance Scheme presents an opportunity to improve their uptake for patients with an indication such as ACS.
Left ventricular ejection fraction is one of the strongest predictors of survival after ACS [29]. Transthoracic echocardiography (TTE) is a noninvasive and relatively inexpensive means of assessing left ventricular function and identifying post-myocardial infarction complications to help guide therapy. However, due to the scarcity of skilled personnel and equipment in low-income countries like Ghana, ready access to TTE is limited and comes with substantial out-of-pocket patient costs [30]. It is noteworthy that for most of the period from January 2021 to March 2022, there was no in-hospital TTE service available at the study site, partly accounting for the low rate of in-hospital assessment of LVEF (38.2%) found in this study. Training of non-cardiologists to perform focused point-of-care echocardiography for estimation of LVEF can be a viable strategy to bridge this care gap [31].
Primary PCI has demonstrated superiority over fibrinolytic in terms of infarct artery patency, rates of recurrent ischemia, repeat revascularisation and overall clinical outcomes [32, 33]. Ghana, which has a population of about 32.8 million, has five PCI-capable hospitals, all located in the capital city along the country's coast [34]. The study site does not offer primary PCI, and the nearest PCI-capable facility is more than ten hours away by road. As a result, thrombolysis was the primary reperfusion strategy available for eligible patients with STEMI, and primary PCI was generally inaccessible to most patients presenting at the study site. Additionally, thrombolysis for STEMI was only recently available (in the last quarter of 2022) at the study site, with streptokinase being the main thrombolytic agent used because of the high cost of alternative agents. In addition to late presentation (median time after symptom onset was 24 hours), these limitations meant that almost all patients presenting with ACS were managed medically, with only three patients receiving reperfusion therapy.
Late presentation characterises ACS in many SSA countries. It can be attributed to a lack of patient education, poor or nonexistent emergency ambulance systems, low index of suspicion by physicians and failure to obtain ECGs on time [4, 35]. It is recommended that patients who present with STEMI to a non–PCI-capable hospital should receive timely fibrinolysis if timely transfer time for primary PCI (within ≤ 120 min of first medical contact) is not feasible [36, 37]. The survival benefit of fibrinolysis is greatest when administered within the first 2 hours of symptom onset and declines progressively after that. Thus, the benefit of fibrinolytic therapy is most effective when provided promptly with a recommended Door-to Needle time of ≤ 30 minutes [36–38]. Given the cost implications of cardiac catheterisation laboratories and the lack of sufficiently trained personnel to deliver primary PCI services in resource-poor settings like Ghana, it would seem more feasible, at least in the short term, to develop an efficient thrombolysis service to ensure eligible patients with STEMI have access to reperfusion therapy. Evidence shows that with adequate training, facilities without onsite cardiologists can adequately offer thrombolysis with encouraging door-to-needle times [39].
Some conservatively managed ACS patients have high-risk coronary artery disease though they may not exhibit symptoms at rest during their hospitalisation. Further risk stratification with a submaximal stress test (exercise-based or pharmacological) before discharge can be employed to identify patients needing invasive angiography and possibly revascularization [40]. No risk-stratifying tool such as the Global Registry of Acute Coronary Events (GRACE) score or the Thrombolysis in Myocardial Infarction (TIMI) score was employed in patients with NSTEMI in this study [41, 42]. Additionally, noninvasive stress tests were not performed or scheduled for conservatively managed patients with ACS, mainly because the study site could not offer these services.
No cardiac rehabilitation program existed within the study area at the time of the study. Cardiac rehabilitation programs offer supervised exercise training alongside other secondary prevention strategies and are designed to speed recovery and improve quality of life following acute cardiovascular events like myocardial infarction. Evidence abounds that timely referral of patients improves subsequent attendance and overall clinical outcomes [43]. Despite its proven benefits and the increasing burden of cardiovascular diseases, little emphasis has been placed on cardiac rehabilitation programs in the African region where it is almost nonexistent [44]. Available evidence, however, supports the feasibility and benefit of a cardiac rehabilitation program, whether in its comprehensive form or modified to suit the local context, in low-income countries in Africa [45, 46].
This study was limited by its retrospective design. Sources of error, such as improper or non-documentation of interventions or timelines, can only partially be eliminated. Another limitation was the involvement of a single study site. However, since TTH is the largest tertiary facility that serves as a referral centre in the northern part of Ghana, the result of this study is expected to closely reflect the current situation in northern Ghana.