ĐÁNH GIÁ KHẢ NĂNG GẮNG SỨC BẰNG NGHIỆM PHÁP GẮNG SỨC ĐIỆN TÂM ĐỒ Ở BỆNH NHÂN NHỊP CHẬM XOANG

Abstract

Objectives: Assess exercise capacity by electrocardiographic stress test in patients with sinus bradycardia and investigate some factors related to exercise capacity in this group of patients. Methods: The study was conducted at the Vietnam Heart Hospital and Hanoi Heart Hospital from January 2020 to September 2021. 60 patients with sinus bradycardia less than 50 beats/min as shown on resting surface electrocardiogram were included in the study. The patients enrolled in the study were evaluated clinical, subclinical, and evaluated for exercise capacity by electrocardiographic stress testing. Results: The mean age of the study group was 55.12±13.89 years old. Male/Female ratio: 1.50/1. Patients in the study had a maximum exercise capacity of 7.78±3.59 METs. The mean heart rate at maximum exertion was 129.90±29.22 beats per min. The mean heart rate recovery after exercises 1 minute was 27.72±16.72 beats per min. The Chronotropic index (CI) was 0.64±0.25. The systolic and diastolic blood pressures at maximum exertion were respectively155.31±20.42 mmHg and 88.13±9.13 mmHg. The rate of failure to achieve 85% of the predicted maximum exercise capacity was 53.3%. There were 53.3% patients who had chronotropic incompetence (CI<0.8). Multi linear regression analysis showed that the factors of age, gender, and bradyarrhythmia were strongly correlated with the patient's exercise capacity. The analyzation of data to yield the equation: Maximum exercise capacity (METs) = 18.857 – 0.637 x Age (years) – 0.238 x Gender (Male = 0; Female = 1) – 2,696 x Bradycardia and Conduction Disorders. (R² = 0.793; p < 0.001).