Nadzheludochkovaya extrasystole
Nadzheludochkovaya extrasystole - a certain type of heartbeat, in which the ectopic focus of automatism is formed in the myocardium of the atria or in the atrioventricular junction. Nadzheludochkovaya extrasystole can be found in people who do not have cardiac pathologies and, conversely. The cause of this condition can be an increased concentration of catecholamines that are involved in circulation, various pathologies of the pericardium and the effect of the pulmonary heart.
Sometimes cardiac atrial contractions can trigger atrial fibrillation and tachycardia in the area above the ventricles. In addition, when impulses develop only in one part of the atrium, monomorphic P-shaped teeth are formed with the same shape, and when pulses appear in different regions, polymorphic or poly-focal ectopic teeth P with different shapes are formed. But the ectopic impulse, which is conducted through the atrioventricular junction, is characterized by a certain delay, that is, an elongated complex of the P-R interval is formed.
In the electrocardiogram, the supraventricular extrasystole is a premature deformed P tooth with subsequent changes in the QRST complex. And after a heart contraction, an incomplete pause of compensatory character is formed, which is somewhat larger than the R-R interval. In some cases, the atrial extrasystole is blocked. Nadzheludochkovaya form of arrhythmia from the atrioventricular node is characterized by extraordinary complexes that have negative P-teeth in certain leads, recorded before the QRS complex and after it, or when it is layered. For cardiac contractions of the atria, the deformations of this complex are inherent in connection with the blockade of the conducting system.
With existing heart disease, patients are constantly monitored to timely identify a permanent form of heart rate abnormality. In this case, antiarrhythmic drugs of the first, second and fourth classes, as well as cardiac glycosides are used. And in the absence of pathological diseases of the heart, it is desirable to stop drinking coffee, tea, alcohol and smoking.
Nadzheluduchkovaya extrasystole causes
To date, there is a variety of causes of supraventricular extrasystole. In general, supraventricular disorders of the heart can be divided into extrasystoles of a functional and organic nature. Some authors consider functional atrial contractions to be only arrhythmias of neurogenic origin that arise in people who have a healthy heart. Indeed, in this category of people in the study of ECG, this arrhythmia is detected in 60% of cases. And they mostly appear when the sinus node is weakened. However, in addition to neurogenic causes, discrete, toxic, dyshormonal, medicinal, etiological factors are isolated, that is, those that are caused by mild forms of dystrophic disturbances in the myocardium and occur during the restoration of metabolic processes.
Neurogenic atrial contractions include hyperadrenergic, vagal and hypoadrenergic cardiac contractions. In the first case, supraventricular extrasystole occurs with emotional excitement, intense physical and mental work of a person, with alcohol, nicotine, spicy food, etc. Very often cardiac contractions develop in patients suffering from neuroses, VSD, diencephalic disorders. But hypoadrenergic extrasystoles are quite problematic to detect. A deficiency in the heart muscle of norepinephrine is characterized by a pathogenetic factor in the presence of myocardial dystrophy of alcoholic-toxic genesis. Also, many athletes with existing myocardial dystrophy on the background of chronic physical overstrain may develop supraventricular extrasystole.
Strengthened vagal stimulation also affects the formation of this arrhythmia. But if interruptions in cardiac contractions appear during sleep, food intake, in a horizontal position, then it can be argued that the cause of the formation of these cardiac contractions is considered to be too great an effect on the heart of the vagus nerve. Very often these reflexes come out of the sliding hernia, the gastric bladder, the diverticula of the esophagus. Other sources of heart irritation include: intestine, gall bladder, abdominal neoplasms, prostate cancer and uterine fibroids, etc.
Functional form of supraventricular extrasystole includes atrial arrhythmias of practically healthy children and young people of high growth. Some of them exhibit changes in the chest, Marfan syndrome, a mid-located heart. These features often occur in combination with VSD, which is the reason for the development of supraventricular extrasystole.
The arrhythmogenic effects of hypokalemia in combination with iron deficiency and anemia, hyperkalemia, hypoproteinemia, sodium retention and water ions, as well as hypertension, are also well known. In addition, thyrotoxic dystrophy plays a significant role in the formation of supraventricular extrasystoles. But tonziglennaya form of cardiac muscle dystrophy is manifested only by single extrasystoles and the cause of their occurrence can be unclear for a long time.
The organic nature of the development of supraventricular extrasystole includes cardiac arrhythmias in the presence of IHD, myocarditis, cardiomyopathies, heart defects, especially with mitral valve stenosis. The second subgroup of this arrhythmia includes patients with triscuspid valve prolapse, a slight defect in the septum between the atria, idiopathic extension of the LA and atrial trunk against diabetes mellitus, obesity and chronic alcohol poisoning.
Nadzheludochkovaya extrasystole symptoms
This is a definite form of arrhythmia, in which the process of cardiac excitation is noted as a result of a pulse that occurs outside the queue, and originating from the atrioventricular junction or atrium.
At the heart of the main mechanism of the development of atrial cardiac contractions is the riientri process in some parts of the heart muscle or the conducting system, which have conductivity of various forms and blockade of this pulse in one direction.
Another mechanism of development of supraventricular extrasystole is pathological automatism of the conduction of the cardiac system, increased activity of myocardial membranes in early diastole or late systole. In clinical practice, one of the most common causes of supraventricular extrasystoles is considered to be violations in vegetative equilibrium, where sympatotonia predominates. These disorders are caused by meteorological, emotional factors and the influence of nicotine, alcohol and coffee on the patients' body. As a rule, supraventricular extrasystole can occur in healthy people up to thirty times a day.
The symptomatic pattern is mainly composed of subjective sensations, which are not always expressed with cardiac contractions of the atria. Suffice hard to tolerate it with patients diagnosed with BPH, but with organic heart defeats this kind of arrhythmia is transferred somewhat easier.
Basically, supraventricular extrasystole is manifested by a stroke, a push of the heart in the chest area from the inside as a result of vigorous contraction of the heart after a compensatory pause. Sometimes there is a turning or tumbling of the heart, a malfunction in his work in the form of fading. For the functional form of the extrasystole, hot flashes, discomfort, weakness, feelings of anxiety, sweating and lack of air are characteristic.
Frequent supraventricular extrasystoles contribute to a reduction in cardiac output, which in turn reduces blood circulation in the coronary vessels, kidneys and brain. And with ischemic heart disease develops angina;At signs of an atherosclerotic defeat of vessels of a brain patients complain of a twisting of a head, fainting states, paresis and aphasia.
In the electrocardiogram with atrial extrasystole prematurely appears tooth P and complex QRS;Deforms and changes the polarity of this tooth;An incomplete compensatory pause is determined;There is a little-changed extrasystolic complex QRS;The shape of the tooth P varies from complex to complex.
Nadzheludochkovaya extrasystole single
This form of supraventricular extrasystole is called premature electrical activation of the heart as a result of impulses that are located in the atria, hollow or pulmonary veins, as well as in the atrioventricular junction. A single supraventricular extrasystole is considered safe and can appear in absolutely healthy people. This type of arrhythmia occurs more often than other forms.
Single supraventricular extrasystole can develop due to various diseases of SSH, endocrine pathologies and other diseases that are accompanied by cardiac symptoms. In healthy people, this arrhythmia is provoked by stressful situations, physical stress, intoxication and iatrogenic factors.
Nadzheluduchkovaya extrasystole single is of two types - atrial and from the atrioventricular node. Atrial form is characterized by the formation of an ectopic focus of excitation in the atria, which is transmitted upward to the sinus node and downward into the ventricles. This type of arrhythmia is caused by organic cardiac lesions and is noted in the horizontal position of the patient.
For nadzheludochkovoy extrasystole AV-connection is characterized by two types of heartbeats. In the first case, the atria are excited, and then the ventricles. And according to the clinical characteristics, they resemble the atrial extrasystole. In the second case, both the atria and the ventricles are stimulated simultaneously.
Symptomatic of a single supraventricular extrasystole is composed of too strong heart pushes and strokes. Patients complain about a malfunction in the heart, when it fades and stops. At the moment of a compensatory pause, the head may become dizzy, there is weakness in the whole body, the patient has nothing to breathe, there is a compressive feeling behind the chest and pain in the heart.
This type of arrhythmia can be detected with cardiac listening, as well as ECG.
Nadzheluduchkovaya extrasystole treatment
Sometimes this arrhythmia can proceed benignly and does not need the appointment of treatment. If possible, they are trying to eliminate the cause of supraventricular extrasystole.
Indications for the use of antiarrhythmic drugs are poorly tolerated this form of arrhythmia, a high risk of ventricular fibrillation and frequent cardiac contractions, more than a thousand per day. Do not use antiarrhythmic therapy for idiopathic arrhythmia, absent symptoms, borderline heart rate and intolerance drugs.
The main goal of the treatment is the need to suppress supraventricular extrasystole and to facilitate the course of symptoms, as well as to reduce the risk of atrial fibrillation.
Indications for hospitalization are the acutely occurring frequent cardiac contractions in the presence of organic atrial lesions.
Non-pharmacologic therapy of supraventricular extrasystoles implies the exclusion of causative factors and psychotherapeutic effects.
But when choosing antiarrhythmic drugs pay attention to the etiology, the number and prognostic value of supraventricular extrasystole. Basically, treatment is started with beta-blockers( Propranol, Atenolol, Metoprol, Bisoprolol, Betaxolol, Nebivolol).Then appoint Verapamil, Diltiazem( calcium antagonists).Especially these two groups of drugs are effective in the trigger form of arrhythmia. And only then they start using antiarrhythmic drugs, taking into account all contraindications( Dizopiramid, Allapinin, Quinidine, Propafenone, Etatsizin).
Holter monitoring is used to evaluate the effectiveness of these drugs. In addition, at the same time sanitize the foci of chronic infection with Chloroquine or Hydroxychloroquine in combination with NSAIDs and small doses of glucocorticoids. And also prescribe sedatives and benzodiazepines with vegetotropic or antiarrhythmic action.
Surgical method of treatment is used for frequent and drug-sensitive arrhythmia in the form of radiofrequency ablation.
Nadzheludochkovaya extrasystole is not dangerous for patients, but sometimes it can be hard to tolerate, and also cause other arrhythmias.
The prognosis of supraventricular extrasystole is directly related to the severity of the underlying cardiac pathology, heart rate and risk of flutter or atrial fibrillation.
