2017年12月30日 星期六

Atrial fibrillation management

signs: breathlessness/dyspnoea, palpitation, syncope, dizziness, chest discomfort, transient ischemic attack
symtoms: irregular pulse, entricular rate >120bmp, no P-wave on ECG, rapid or irregular QRS

Acute or recent-onset AF (lone AF)

定義:recent-onset AF, 48小時
處置: 

  • Haemodynamic compromise (such as symptomatic hypotension, acute heart failure, unstable angina, loss of consciousness or shock): Electrical direct current (DC) cardioversion+heparin (成功率高達但一年內復發機率也高)
  • Haemodynamic stable:Pharmacological cardioversion: flecainide(有CAD建議用), amiodarone(有LVH建議用) or propafenone(有心臟病不能用)



Persistent and permanent AF 
(1)Rhythm control 建議用在:
Are symptomatic有症狀的
Are under 65 or 70 years of age年輕的Present with AF for the first time (ie, lone AF)第一次心房顫動的Present with AF secondary to a precipitating factor(that has been treated or corrected)心房顫動不是原發性的
Have congestive heart failure 有心衰竭的

一般 persistence AF會做elective DC cardioversion (在做之前必須先吃抗凝血藥4週,例如warfarin INR>2 for 4 weeks) 如果此次cardioversion失敗,在下一次預計cardioversion前先吃四週antiarrhythmic medicine (such as amiodarone or sotalol) 會提升成功機會。如果再失敗,就必須長期服用抗心律不整藥,此時beta blocker是首選。
如果beta blocker無法控制,考慮加上second line:

Amiodarone (in the presence of structural heart disease)(increase refractory peroid)
Flecainide or sotalol (in the absence of structural heart disease) 




(2)Rate control (ventricular thickness >5cm the successful chance is thin for cardioversion)
目標:60 to 80 beats/min at rest / 90 and 115 beats/min during moderate exercise (目標依年紀可調整)
  
NICE 建議rate control用在:

Are over 65 years of age 年紀大的
Have coronary artery disease有冠心病Have contraindications to antiarrhyth micmedicines  有藥物禁忌症
Are unsuitable for cardioversion 不適合做cardioversion

藥品有:

Standard beta-blockers (such as atenolol or bisoprolol) 
Rate-controlling calcium channel blockers (such as verapamil or diltiazem) 
Digoxin只建議用在sedentary病人or合併有心衰竭的AF



Paroxysmal AF (self-limiting)
處置:
infrequent but symptomatic:pill-in-the-pocket 
例如:flecainide or propafenone (使用前要排除有left-ventricular dysfunction or valve disease) 


more frequent episodes
beta blocker
若控制不佳,考慮加上第二種藥:Flecainide, propafenone, setalol (保留在有CAD), amiodarone (保留在有structural heart disease )




Wyse DG, Waldo AL, DiMarco JP, et al. A comparison of rate control and rhythm control in patients with atrial fibrillation. New England Journal of Medicine 2002;347:1825–33.

沒有留言:

張貼留言