Risk Factors for Hospital Mortality in Acute ST-Segment Elevation Coronary Syndrome Complicated by Cardiogenic Shock

Abstract

The aim. To study the risk factors for hospital mortality in patients with acute coronary syndrome with ST-segment elevation (STEACS) complicated by cardiogenic shock (CS).Materials and methods. A total of 104 patients with STEACS complicated by CS were studied. The follow-up group (group I) included 58 (55,8%) patients who died in hospital (mean age 71,8±7,31 years), the comparison group (group II) – 46 patients, who have been treated and discharged (mean age 59,5±6,18 years). All patients underwent general clinical studies, the level of troponins, lipids, glucose, creatinine in plasma was determined, electrocardiography and echocardiography were performed. Coronary angiography and percutaneous coronary intervention (PCI) were urgently performed. The method of binary logistic regression with the determination of the odds ratio and its 95% confidence interval for each reliable variable was used to identify risk factors for hospital mortality.Results. In group I patients with CS, compared with group II, patients over the age of 70 (32 (55,2%) vs 10 (22,7%), р=0,0004), with concomitant chronic kidney disease (32 (55,2%) vs 9 (19,6%), p=0,0002), postinfarction cardiosclerosis (30 (51,7%) vs 9 (19,6%), р=0,001) and chronic heart failure of III-IV functional class (32 (55,1%) vs 11 (23,9%), p=0,001) were significantly more often observed. Baseline levels of plasma leukocytes, troponin and creatinine were significantly higher in deceased patients with CS. Left ventricular ejection fraction below 40% was observed more often in the follow-up group than in the comparison group (46 (79,3%) vs 27 (58,7%), p=0,022). In group I, compared with group II, there was a higher incidence of three-vessel coronary lesions (36 (75%) vs 12 (26,1%), p=0,0001) and chronic coronary artery occlusion unrelated to STEACS (25 (52,1%) vs 12 (26,1%), р=0,009). The same trend was observed when assessing the average number of stenoses and occlusions of the coronary arteries. PCI was performed in 43 (74,1%) of the deceased and 43 (93,5%) of the surviving STEACS patients with CS (p=0,009). The follow-up group had a higher rate of unsuccessful PCI (30,2%) vs 3 (7%), р=0,001) and performed later than 6 hours after the onset of an angina attack (28 (65,1%) vs 6 (14%), р=0,0001).Summary. Hospital mortality in patients with STEMI complicated by CS was associated with the presence left ventricular ejection fraction less than 40%, three-vessel coronary lesion and performing PCI later than 6 hours from the beginning of the pain attack.