Influence of Deep Breathing on Heart Rate Variability in Patients with Ischemic Heart Disease
HRV was assessed in 121 consecutive patients on 3-7 days after admission. Patients were instructed to take 6 deep respirations in 1 minute while changes in heart rate were measured and calculated by an electrocardiographic recorder automatically. The test result was defined as a difference between the shortest and longest heart rate interval: HRV = [60.000/Short R-R interval (msec)] - [60.000/Long R-R interval (msec)], measured in beats per minute. HRV was less than 10 beats/min in 27% of the patients, between 10 to 20 beats/min in 46% of patients, and more than 20 beats/min in 27% of patients. HRV less than 10 beats/min was in 35% of patients with myocardial infarction, 27.6% in patients with coronary artery stenosis and 18.4% in patients without coronary artery stenosis. The value of HRV during deep breathing test was found to be lower in patients with coronary artery stenosis ≥ 50 % comparing to the patients with coronary artery stenosis ≤30% (respectively 14.2±1.0 and 19.6±2.1; p=0.02). That has shown diminished vagal-cardiac activity in patients with coronary artery disease. Ill. 2, bibl. 9 (in English; summaries in Lithuanian, English and Russian).
Authors retain copyright and grant the journal the right of the first publication with the paper simultaneously licensed under the Creative Commons Attribution 4.0 (CC BY 4.0) licence.
Authors are allowed to enter into separate, additional contractual arrangements for the non-exclusive distribution of the paper published in the journal with an acknowledgement of the initial publication in the journal.
Copyright terms are indicated in the Republic of Lithuania Law on Copyright and Related Rights, Articles 4-37.