From what reason was the sinus aroused in interest and slow caused? 's general knowledge

From what reason was the sinus aroused in interest and slow caused? 's general knowledge
(1) Pathogenic factor
1.Cause of disease outside the heart Mostly adopt the nerve ' It is mainly the excitement of nervus vagus) , humoral mechanism nerve work or act on the intersection of sinus and room form and cause sinus to be aroused in interest and too slow directly outside heart.
( 1) Physiology: During normal sleep, for example: During noon and night sleep, because the tension of nervus vagus increases and can present the sinus aroused in interest and too slow, the heart rate can be in 40 times about min in 50 times about, specific min. Athletes can be in 50 times about min in daytime, it is specific and very low to 38 times about min at night. The physical labourer often presents the sinus aroused in interest and too slow too. It is obvious to young people and the elderly.
( 2) Nervus vagus the intersection of centre and excitability increase to: For instance press and rise in the cranium that meningitis, cerebral hemorrhage, brain tumour, encephalitis, brain traumatism,etc. cause, jaundice, neurosis, blood vessel inhibiting collapse and schizophrenia,etc., lead to the fact nervus vagus to be excited, make the intersection of sinus and room form self-disciplining, reduce and take place sinus nature to be aroused in interest too slow.
( 3) The excitement of diastaltic nervus vagus: Such as oppressing the eyeball, pressing carotid sinus, stimulating swallowing department, disgusting vomiting, holds one's breath, swallowing, coughing, worried vigorously, while making Valsalva movement, Muller and acting, it is obvious to illness such as gastrectasia, intestinal obstruction, secreting calculus, cholelithiasis of urine department, can cause the diastaltic nervus vagus, the excited kindling sinus is aroused in interest and too slow.
( 4) The supersession is reduced: Such as low temperature, severe malnutritive cachexia, pituitary function low lowering diseasing,etc. by the intersection of thyroid gland and function.
( 5) Medicine place to: Some medicine can make the intersection of nervus vagus and excitability increase or inhibit the intersection of sinus and room from form function and cause sinus nature to be aroused in interest too slow directly, profit give up blood-pressure drug such as flat, Verticil, guanethidine for instance, receptor blocks medicine, foreign digitalis, the Kui 's,etc..
( 6) The crisis of some infectious diseases or convalescence: Such as typhoid fever, diphtheria, influenza,etc..
( 7) The electrolyte is disorderly: The intersection of hyperkalemia and disease, uremia or sour person who changes alkalinity of blood.
( 8) Peptic ulcer amalgamates the sinus aroused in interest and too slow: Peptic ulcer, in having illness coming on in the mechanism, the secretion of the gastric acid is mainly controlled by the tension of nervus vagus, it is interesting too slow that it can cause the sinus that when increasing in its excitability.
( 9) The family sinus is aroused in interest and too slow.
The sinus due to the factors is aroused in interest and too slow, most with the hyperfunction phenomenon of nervus vagus outside the heart, nerve nature, the heart rate is not very steady. When the tension of autonomic nerve changes, often have a change of heart rate after such as deeplying breathe, movement, injecting atropines,etc., one can be slightly lengthened among P-R.
2.The sinus room forms the function to damage Mean, marry, damage by the intersection of sinus and room ' For instance inflammation, ischemic, poison or the intersection of regression and damage,etc. that change) And the sinus caused is aroused in interest and too slow. In addition, it is obvious that damages the cardiac muscle, such as membrane inflammation, ill, myocardium infarction of cardiac muscle, cardiac muscle are hardened etc. in the myocarditis, pericarditis, heart. Also may be that a passing sinus room form inflammation, ischemic and poisoning due to damage.
3.Acute myocardium sinus getting aroused in interest infarction slow incidence 20%-40%, have illness coming on early most high incidence (especially lay infarction of wall) in acute myocardium infarction .
(2) Onset mechanism
Getting aroused in interest sinus slow the intersection of emergence and department form, get up, fight cell because of the intersection of sinus and room 4 phase rising speed slow down and most great the intersection of relaxation and issues of the intersection of electric potential and negative value increase, move etc. at the threshold potential level, enable the sinus room marry the self-disciplining intensity, lower.
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