Related Experiment Video
Updated: Aug 14, 2026

Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions
Published on: June 5, 2019
Tinnitus, heart rate variability, and some biochemical indicators
E Datzov1, S Danev, H Haralanov
1Department of Physiology, Psychology, and Ergonomics, National Center of Hygiene, Medical Ecology, and Nutrition, Sofia.
Abstract:
Twenty-three tinnitus patients between the ages of 25 and 66 years (mean age, 47.6) were examined completely in the neurootological clinic of the Medical University, Sofia. Heart rate variability measurements were obtained to reveal the relationship between tinnitus and the autonomic equilibrium. Some biochemical indicators (serotonin and the colored sedimentary uric reaction of Kimbarovski [CSURK]) also were followed up. For 19 patients with transitional disturbances in the vertebrobasilar blood circulation, the sympathetic portion of the autonomic nervous system predominates, and heart rate variability is suppressed. The higher suppression of heart rate variability and higher values of the health risk in four occupationally exposed patients are attributable to the higher expressed level of stress connected with the adverse work conditions. Changes in the health risk, CSURK, and serotonin blood values in four tinnitus patients also are discussed.
Related Concept Videos
Regulation of Pulse
Increased pulse rate
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
Factors Influencing Heart Rate
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
Heart Sounds
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V) valves at the...
Blood Studies for Cardiovascular System I: Cardiac Biomarkers
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies

