The awareness of an abnormal heart rhythm is the definition of palpitations. It is one of the most common causes requiring a visit to the personal doctor (16%) and the second most common symptom after chest pain, that requires evaluation from a cardiologist. Patients describe the sensation in a variety of ways such as loss of a heartbeat, increased heart rate, sudden stop of the heart or “fluttering” in the chest area. This discomfort can also be felt in the neck or ear, especially during bedtime and is usually short-lived. It should be noted that normal heartbeat is perceived during intense physical activity or emotional stress. Although it is a very common phenomenon, little is known about the neurological mechanisms responsible for sensing the change in the heartbeat. It is possible that specialized receptors in the myocardium and pericardium recognize the change in rhythm and send the corresponding messages to higher brain centers for processing.
Causes
The causes of palpitations can be divided into five major categories as presented in the latest guidelines of the European Society of Cardiology Categories:
1. Cardiac Arrhythmias
i. Supraventricular / ventricular extrasystoles
ii. Supraventricular / ventricular tachycardias
iii. Bradyarrhythmias
iv. Pacemaker malfunction
2. Structural Heart Diseases
i. Prolapse of the mitral valve
ii. Severe mitral valve regurgitation
iii. Severe aortic valve regurgitation
iv. Congenital heart disease
v. Hypertrophic cardiomyopathy
vi. Mechanical prosthetic valves
3. Psychosomatic Disorders
i. Anxiety, panic attacks
ii. Depression
4. Systemic Diseases
i. hyperthyroidism
ii. hypoglycemia
iii. fever
iv. anemia
v. pregnancy
vi. hypovolemia, orthostatic hypotension,
vii. orthostatic tachycardia syndrome
viii. pheochromocytoma,
ix. arteriovenous communication
5. Effects of drugs and illicit substances
i. Sympathomimetic agents
ii. Vasodilators and anticholinergics
iii. Abrupt withdrawal of b-blockers
iv. Alcohol, cocaine, heroin, amphetamines, caffeine, nicotine, cannabis,
v. Weight loss drugs
Clinical presentation
The clinical presentation is diverse. Important information that the doctor must recognize is:
• The rhythm
• How the symptoms start and terminate
• The triggering causes
• How the patient perceives it
• The accompanying symptoms.
For example, extrasystoles are arrhythmic, start abruptly, usually occur at rest, and the patient experiences an extra heartbeat without any other symptoms. In contrast, the palpitations due to emotional stress, have normal rhythm with gradual onset, occur after emotional stress and the patient emphasizes more on the feeling of anxiety rather than the change in cardiac function, describing symptoms such tingling of the upper extremities or mouth. , atypical chest pain and shortness of breath.
In addition, palpitations after sudden changes in posture are often due to orthostatic hypotension or episodes of atrioventricular tachycardia. Arrhythmias that occur during exercise usually involve either monomorphic ventricular tachycardia or polymorphic catecholamine ventricular arrhythmia and require immediate investigation and treatment.
It is important to know that severe symptoms such as fatigue, angina or even syncope usually affect patients with ischemic or other cardiomyopathies. We must emphasize that syncope can occur rarely and in people with a structurally normal heart during supraventricular tachycardia.
Diagnostic approach
Obtaining a detailed history along with physical examination and electrocardiogram remain the cornerstone in the initial treatment of patients with palpitations. An individual history of ischemic cardiomyopathy, abnormal electrocardiogram findings (long QT syndrome, Brugada syndrome, left ventricular hypertrophy), and a family history of sudden cardiac death increase the chances that the palpitations are derived due to malignant arrhythmias.
In patients at low or moderate risk for arrhythmia but with frequent episodes of palpitations, a heart rate Holter placement can be performed for 24 hours to 7 days. This device is the size of a small mobile phone, is worn in a special case like a belt and the patient is asked to record a short diary of the time and the characteristics of the symptoms. Blood tests are usually necessary to rule out systemic diseases such as thyroid disease or anemia.
Cardiac ultrasound as well as other modern non-invasive techniques such as computed tomography of the heart and blood vessels and magnetic resonance imaging are important tools in the hands of the cardiologist to make the diagnosis and plan the correct and timely treatment of the patient.
Specialized examinations such as implantation of an implantable loop recorder (ILR) and invasive electrophysiological study are necessary in high-risk patients, with high clinical suspicion of the presence of severe arrhythmias but without having been recorded so far by other monitoring devices.
Therapeutic options
In the vast majority of patients with palpitations, the cause is benign and does not require extensive investigation or any specialized treatment. Reassuring the patient, avoiding the provocative causes and addressing the common risk factor is enough.
Lifestyle changes should be made, such as reducing caffeine, quitting smoking and avoiding alcohol consumption. Healthy eating, exercise and reducing stress are very important as well.
In special cases, antiarrhythmic drugs may be given to control symptoms such as β-blockers and calcium channel blockers. When the palpitations are due to severe and drug-resistant arrhythmias, catheter ablation is indicated and, if necessary, the placement of a pacemaker and / or an automatic implantable defibrillator.
References:
1. Raviele, A., Giada et al (2011). Management of patients with palpitations: a position paper from the European Heart Rhythm Association. Europace, 13(7), pp.920-934.