Atrial flutter has many clinical aspects that are similar to atrial fibrillation (ie, underlying disease, predisposing factors, complications, medical management). However, the underlying mechanism of atrial flutter makes it amenable to cure this arrhythmia with percutaneous catheter-based techniques.
Some patients have both atrial flutter and atrial fibrillation. The elimination of atrial flutter has been noted to reduce or eliminate episodes of atrial fibrillation. Left untreated, persistent atrial flutter can degenerate into chronic atrial fibrillation. Uncommon forms of atrial flutter have been noted during long-term follow-up in as many as 26% of patients with surgical correction of congenital cardiac anomalies.
In most studies, approximately 30% of patients have no underlying cardiac disease, 30% have coronary artery heart disease, and 30% have hypertensive heart disease. Other conditions are also associated with atrial flutter, including cardiomyopathy, hypoxia, chronic obstructive pulmonary disease, thyrotoxicosis, pheochromocytoma, electrolyte imbalance, and alcohol consumption.
Animal models have been used to demonstrate that an anatomical block (surgically created) or a functional block of conduction between the superior vena cava and inferior vena cava, similar to the crista terminalis in the human right atrium, is key to initiating and maintaining the arrhythmia.
In humans, the most common form of atrial flutter (type I [classic]) involves a single reentrant circuit with circus activation in the right atrium around the tricuspid valve annulus (most often in a counterclockwise direction), with an area of slow conduction located between the tricuspid valve annulus and the coronary sinus ostium (subeustachian isthmus).
The crista terminalis acts as another anatomic conduction barrier, similar to the line of conduction block between the 2 venae cavae required in the animal model. The orifices of both venae cavae, the eustachian ridge, the coronary sinus orifice, and the tricuspid annulus complete the barrier for the reentry circuit. Atrial flutter is often referred to as isthmus-dependent flutter. Usually the rhythm is due to reentry, there is an excitable gap, and the rhythm can be entrained.
Classic counterclockwise atrial flutter has caudocranial activation (ie, counterclockwise around the tricuspid valve annulus when viewed in the left antero-oblique fluoroscopic view) of the atrial septum.
Classic atrial flutter can also have the opposite activation sequence (ie, clockwise activation around the tricuspid valve annulus). Clockwise atrial flutter is much less common. This arrhythmia is still considered type I, isthmus-dependent, clockwise flutter.
Type II (atypical) atrial flutters are less extensively studied and electroanatomically characterized. Atypical atrial flutters may originate from the right atrium (surgical scars [ie, incisional reentry]) or from the left atrium (pulmonary veins [ie, focal reentry] or mitral annulus).
Left atrial flutter is common after incomplete left atrial ablation procedures and may result in faster ventricular rates than seen during atrial fibrillation. Thus, tricuspid isthmus dependency is not a prerequisite for atrial flutter. Often, the atrial rate is faster (340-350 bpm) in atypical flutter and the arrhythmia can not be entrained.
Atrial flutter is much less common than atrial fibrillation. From 1985-1990, of patients admitted to US hospitals with a diagnosis of supraventricular tachycardia, 77% had atrial fibrillation and 10% had atrial flutter. Based on a study of patients referred for tertiary care centers, the incidence of atrial flutter in the United States is estimated at 200,000 new cases per year.1
Prognosis depends on the patient's underlying medical condition. Any atrial arrhythmia can cause a tachycardia-induced cardiomyopathy. Intervening to control the ventricular response rate or to return the patient to sinus rhythm is important. Thrombus in the left atrium has been described in patients with atrial flutter (0-21%). Thromboembolic complications have also been described.
Due to conduction properties of the atrioventricular node, many people with atrial flutter will have a faster ventricular response (than those with atrial fibrillation). Heart rate is often more difficult to control with atrial flutter than with atrial fibrillation.
Atrial flutter is associated with a male predominance. In a study of 100 patients with atrial flutter, 75% were men. In another study performed at a tertiary care study, atrial flutter was 2.5 times more common in men.
Patients with atrial flutter, as with atrial fibrillation, tend to be older adults. In one study, the average age was 64 years (range 27-86 y).
The severity of symptoms and the patient's underlying cardiac condition dictate the initial management approach.
The most common symptom is palpitations. Other symptoms include fatigue, dyspnea, and chest pain.
Address symptoms of other noncardiac conditions (eg, hyperthyroidism, pulmonary disease) or cardiac conditions associated with atrial flutter that may be reversible.
The most common symptom is palpitations. Other symptoms include fatigue, dyspnea, and chest pain.
Assessing the onset of symptoms/palpitations is critical. Atrial flutter (of a duration >48 h) requires anticoagulation with warfarin or transesophageal echo to rule out thrombus in the left atrium prior to cardioversion to sinus rhythm. Thus, the duration of the episode and the onset of atrial fibrillation or flutter may affect the timing of cardioversion and the need to address anticoagulation.
Precipitating causes and modes of termination of the arrhythmia.
Previous response to pharmacologic therapy.
Often, atrial flutter is not as well tolerated as atrial fibrillation. This may be due to the rapid and difficult-to-control ventricular response, especially with minimal exertion.
Atrial flutter can cause hypotension, angina, congestive heart failure, and rarely syncope due to rapid ventricular response in the setting of compromised left ventricular function.
The general appearance and vital signs of the patient are important when determining the urgency with which to restore sinus rhythm. Thus, the initial cardiopulmonary evaluation and monitoring for signs of cardiac or pulmonary failure help guide initial management.
Evaluate the vitals with a close eye on heart rate, blood pressure, and oxygen saturation.
Palpate the neck/thyroid gland for goiter.
Evaluate the neck for jugular venous distention.
Auscultate the lungs for rales/crackles.
Auscultate/palpate the heart for extra heart sounds and murmurs, and palpate the point of maximum impulse.
Examine the extremities to access for lower extremity edema/perfusion.
Atrial flutter is most often associated with left ventricular dysfunction, rheumatic heart disease, congenital heart disease, and postcardiac surgery.
Thyroid disease, obesity, pericarditis, pulmonary disease, and pulmonary embolism have been associated with atrial fibrillation and atrial flutter. Rarely, mitral valve prolapse has been associated with atrial flutter.
Rarely, atrial flutter can be associated with an acute myocardial infarction.
Postcardiac surgery, atrial flutter may be reentrant as a result of natural barriers, atrial incisions, and scar.
Some patients develop atypical left atrial flutter after pulmonary vein isolation for atrial fibrillation.
Abu Zubair meriwayatkan dari Jabir bin Abdullah bahwa Nabi Muhammad SAW bersabda:
"Setiap penyakit ada obatnya. Jika obat yang tepat diberikan dengan izin Allah, penyakit itu akan sembuh".
(HR. Muslim, Ahmad dan Hakim).
Sabtu, 28 November 2009
Diposting oleh FX di 05.01
The Holy Al-Qur'an (English version)
- Surah 1 - Al Fatiha THE OPENING
- Surah 2 - Al Baqarah THE HEIFER
- Surah 3 - Ali 'Imran - THE FAMILY OF 'IMRAN
- Surah 4 - Al-Nisa' THE WOMEN
- Surah 5 - Al Ma'idah THE REPAST
- Surah 6 - Al An'am THE CATTLE
- Surah 7 - Al A'raf THE HEIGHTS
- Surah 8 - Al Anfal THE SPOILS OF WAR
- Surah 9 - Al Tawbah THE REPENTANCE
- Surah 10 - Yunus JONAH
- Surah 11 - Hud THE PROPHET HUD
- Surah 12 - Yusuf JOSEPH
- Surah 13 - Al Ra'd THE THUNDER
- Surah 14 - Ibrahim ABRAHAM
- Surah 15 - Al Hijr THE ROCKY TRACT
- Surah 16 - Al Nahl BEES
- Surah 17 - Al Isra' THE NIGHT JOURNEY
- Surah 18 - Al Kahf THE CAVE
- Surah 19 - Maryam MARY
- Surah 20 - TA HA
- Surah 21 - Al Anbiya THE PROPHETS
- Surah 22 - Al Hajj THE PILGRIMAGE
- Surah 23 - Al Mu'minun THE BELIEVERS
- Surah 24 - Al Nur THE LIGHT
- Surah 25 - Al Furqan THE CRITERION
- Surah 26 - Al Shu'ara' THE POETS
- Surah 27 - Al Naml THE ANTS
- Surah 28 - Al Qasas THE NARRATIONS
- Surah 29 - Al 'Ankabut THE SPIDER
- Surah 30 - Al Rum THE ROMANS
- Surah 31 - Luqman LUQMAN
- Surah 32 - Al Sajdah THE PROSTRATION
- Surah 33 - Al Ahzab THE CONFEDERATES
- Surah 34 - Saba' SHEBA
- Surah 35 - Fatir THE ORIGINATOR OF CREATION
- Surah 36 - Ya Sin YA SIN
- Surah 37 - Al Saffat THOSE RANGED IN RANKS
- Surah 38 - Sad SAD
- Surah 39 - Al Zumar CROWDS
- Surah 40 - Ghafir FORGIVER
- Surah 41 - Fussilat EXPOUNDED
- Surah 42 - Al Shura CONSULTATION
- Surah 43 - Al Zukhruf THE GOLD ADORNMENTS
- Surah 44 - Al Dukhan THE SMOKE
- Surah 45 - Al Jathiyah THE KNEELING DOWN
- Surah 46 - Al Ahqaf WINDING SAND-TRACTS
- Surah 47 - Muhammad MUHAMMAD
- Surah 48 - Al Fath THE VICTORY
- Surah 49 - Al Hujurat THE CHAMBERS
- Surah 50 - Qaf QAF
- Surah 51 - Al Dhariyat THE WINDS THAT SCATTER
- Surah 52 - Al Tur THE MOUNT
- Surah 53 - Al Najm THE STAR
- Surah 54 - Al Qamar THE MOON
- Surah 55 - Al Rahman THE MOST GRACIOUS
- Surah 56 - Al Waq'iah THE INEVITABLE
- Surah 57 - Al Hadid IRON
- Surah 58 - Al Mujadilah THE WOMAN WHO PLEADS
- Surah 59 - Al Hashr THE MUSTERING
- Surah 60 - Al Mumtahinah THAT WHICH EXAMINES
- Surah 61 - Al Saff THE BATTLE ARRAY
- Surah 62 - Al Jumu'ah FRIDAY
- Surah 63 - Al Munafiqun THE HYPOCRITES
- Surah 64 - Al Taghabun THE MUTUAL LOSS AND GAIN
- Surah 65 - Al Talaq DIVORCE
- Surah 66 - Al Tahrim PROHIBITION
- Surah 67 - Al Mulk THE DOMINION
- Surah 68 - Al Qalam THE PEN
- Surah 69 - Al Haqqah THE SURE REALITY
- Surah 70 - Al Ma'arij THE WAYS OF ASCENT
- Surah 71 - Nuh NOAH
- Surah 72 - Al Jinn THE SPIRITS
- Surah 73 - Al Muzzammil THE ENFOLDED ONE
- Surah 74 - Al Muddaththir THE ONE WRAPPED UP
- Surah 75 - Al Qiyamah THE RESURRECTION
- Surah 76 - Al Insan MAN
- Surah 77 - Al Mursalat THOSE SENT FORTH
- Surah 78 - Al Naba' THE GREAT NEWS
- Surah 79 - Al Nazi'at THOSE WHO TEAR OUT
- Surah 80 - 'Abasa HE FROWNED
- Surah 81 - Al Takwir THE FOLDING UP
- Surah 82 - Al Infitar THE CLEAVING ASUNDER
- Surah 83 - Al Mutaffifin THE DEALERS IN FRAUD
- Surah 84 - Al Inshiqaq THE RENDING ASUNDER
- Surah 85 - Al Buruj THE CONSTELLATIONS
- Surah 86 - Al Tariq THE NIGHT STAR
- Surah 87 - Al A'la THE MOST HIGH
- Surah 88 - Al Ghashiyah THE OVERWHELMING EVENT
- Surah 89 - Al Fajr THE DAWN
- Surah 90 - Al Balad THE CITY
- Surah 91 - Al Shams THE SUN
- Surah 92 - Al Layl THE NIGHT
- Surah 93 - Al Duha THE GLORIOUS MORNING LIGHT
- Surah 94 - Al Sharh THE EXPANSION OF THE BREAST
- Surah 95 - Al Tin THE FIG
- Surah 96 - Al Alaq THE CLINGING CLOT
- Surah 97 - Al Qadr THE NIGHT OF POWER
- Surah 98 - Al Bayyinah THE CLEAR EVIDENCE
- Surah 99 - Al Zalzalah THE EARTHQUAKE
- Surah 100 - Al 'Adiyat THOSE THAT RUN
- Surah 101 - Al Qari'ah THE GREAT CALAMITY
- Surah 102 - Al Takathur THE PILING UP
- Surah 103 - Al 'Asr TIME THROUGH THE AGES
- Surah 104 - Al Humazah THE SCANDALMONGER
- Surah 105 - Al Fil THE ELEPHANT
- Surah 106 - Quraysh THE TRIBE OF QURAYSH
- Surah 107 - Al Ma'un THE NEIGHBOURLY ASSISTANCE
- Surah 108 - Al Kawthar THE ABUNDANCE
- Surah 109 - Al Kafirun THOSE WHO REJECT FAITH
- Surah 110 - Al Nasr THE HELP
- Surah 111 - Al Masad THE PLAITED ROPE
- Surah 112 - Al Ikhlas THE PURITY OF FAITH
- Surah 113 - Al Falaq THE DAYBREAK
- Surah 114 - Al Nas MANKIND
- Acute Coronary Syndromes
- Angina Pectoris
- Anomalous Left Coronary Artery From the Pulmonary Artery
- Aortic Coarctation
- Aortic Dissection
- Aortic Regurgitation
- Aortic Stenosis
- Aortic Stenosis, Subaortic
- Aortic Stenosis, Supravalvar
- Ashman Phenomenon
- Atrial Fibrillation
- Atrial Flutter
- Atrial Myxoma
- Atrial Septal Defect
- Atrial Tachycardia
- Atrioventricular Block
- Atrioventricular Dissociation
- Atrioventricular Nodal Reentry Tachycardia (AVNRT)
- Benign Cardiac Tumors
- Brugada Syndrome
- Complications of Myocardial Infarction
- Coronary Artery Atherosclerosis
- Coronary Artery Vasospasm
- Digitalis Toxicity
- Dissection, Aortic
- Ebstein Anomaly
- Eisenmenger Syndrome
- First-Degree Atrioventricular Block
- HACEK Group Infections (Infective Endocarditis)
- Heart Failure - Decompensatio Cordis
- Holiday Heart Syndrome
- Hypertensive Heart Disease
- Junctional Rhythm
- Loeffler Endocarditis
- Long QT Syndrome
- Lutembacher Syndrome
- Mitral Regurgitation
- Mitral Stenosis
- Mitral Valve Prolapse
- Myocardial Infarction
- Myocardial Rupture
- Paroxysmal Supraventricular Tachycardia
- Patent Ductus Arteriosus
- Patent Foramen Ovale
- Pericardial Effusion
- Pericarditis Acute
- Pericarditis, Constrictive
- Pericarditis, Constrictive-Effusive
- Pulmonic Regurgitation
- Pulmonic Stenosis
- Right Ventricular Infarction
- Saphenous Vein Graft Aneurysms
- Second-Degree Atrioventricular Block
- Sinus of Valsalva Aneurysm
- Sudden Cardiac Death
- Tetralogy of Fallot
- Third-Degree Atrioventricular Block
- Torsade de Pointes
- Tricuspid Regurgitation
- Tricuspid Stenosis
- Unstable Angina
- Ventricular Fibrillation
- Ventricular Septal Defect
- Ventricular Tachycardia
- Wolff-Parkinson-White Syndrome