Optimal medical therapy, clinical outcome and its predictors in patients with acute coronary syndrome after discharge with secondary prevention medications at University of Gondar Comprehensive Specialized Hospital, North West Ethiopia, 2023: A retrospective follow-up study

Abstract

Background: The life-threatening diseases known as ACS (acute coronary syndrome) continue to produce considerable rates of morbidity and mortality despite breakthroughs in therapy. The study determined clinical outcome and its predictors in patients at the University of Gondar Comprehensive and Specialized Hospital (UOGCSH), North West Ethiopia.

Design, setting, and participants: A retrospective cohort study design was employed at UOGCSH from January 31, 2018 to February 1, 2023. The hospital used a systematic random sampling procedure to select study participants from the medical records of patients in chronic cardiac follow-up clinics.

Main outcome measures: Exposures were optimal medical therapy (OMT) versus non-optimal medical therapy collected from May to August 2023. Descriptive and analytical statistics were employed to compare study groups. A binary logistic regression model was employed to identify candidate variables for further analysis. Cox's proportional hazard model and log-rank test were employed, with a P-value < 0.05 used to evaluate statistical significance. A five-year all-cause mortality after discharge estimate was displayed by using Kaplan-Meier curves.

Results: Among 422 patients with ACS [mean age, 61.56 (SD = 9.686) years; 54.7% male], of whom only 59.2% (250) received optimal medical therapy at discharge. Age ≥ 65, atrial fibrillation, chronic kidney diseases, and cardiogenic shock were negative independent predictors of optimal medical therapy. On the other hand, male sex was independently associated with the use of optimal medical therapy. All-cause mortality occurred in 16.6% (n = 70) and major adverse cardiac events occurred in 30.8% (n = 130) of patients with a 95% CI of 0.132-0.205 and 0.264-0.355, respectively. Multivariate analyses indicated that OMT was significantly associated with reduced all-cause mortality (aHR: 0.431, 95% CI: 0.222-0.835; P = 0.013).

Conclusion: This study revealed that the use of preventive OMT in patients discharged with acute coronary syndrome was associated with a reduction in all-cause mortality. However, the use of this OMT is suboptimal.

Keywords: Acute coronary syndrome; Clinical outcome; Ethiopia; Gondar; Optimal medical therapy.

Fig. 1

Class diagnosis for acute coronary syndrome patients in UOGCSH from January 31, 2018 to February 1, 2023(n = 422)

Fig. 2

Discharge medications of acute coronary syndrome patients admitted from January 31, 2018 to February 1, 2023(n = 422)

Fig. 3

Kaplan Meier curve of (A) 5-year survival, and (B) major adverse cardiac events (MACE) between OMT and non-OMT group