torsade de pointes

tor·sade de pointes

(tōr-sad' dĕ pwant'), This word, referring not to individual QRS complexes but to an overall pattern of variation in their form, is properly used in the singular, not the plural (torsades de pointes).
"Twisting of the points," a form of ventricular tachycardia nearly always due to medications and characterized by a long QT interval and a "short-long-short" sequence in the beat preceding its onset. The QRS complexes during this rhythm tend to show a series of complexes points up followed by complexes points down, often with a narrow waist between and no definite T waves; at one time referred to as "cardiac ballet."
[Fr. torsade, fringe, twist, or coil, + pointe, point or tip (euphonious for "wave burst")]

torsade de pointes

French, torsade–twist, Cardiology A form of polymorphic ventricular tachycardia with prolonged Q-T intervals initiated by a premature ventricular depolarization striking near the apex of a delayed T wave; torsades have irregular rates of 200-250/min with marked variability in amplitude and direction of a QRS wave that seems to twist around an isoelectric baseline; torsades may spontaneously resolve or evolve to ventricular tachyarrhythmia and may be nonspecific or due to drugs–eg, adrenergics, antihistamine, phenothiazine, procainamide, quinines, sotalol, and tricyclic antidepressants, electrolyte imbalance–eg, hypokalemia, hypomagnesemia, CNS hemorrhage or trauma, long Q-T wave syndrome, liquid diet, and underlying heart disease Management Isoproterenol.

tor·sade de pointes

(tōr-sahd' dĕ pwahnt')
Literally, "twisting of points," a form of ventricular tachycardia nearly always due to medications and characterized by a long QT interval and a "short-long-short" sequence in the beat preceding its onset. The QRS complexes during this rhythm tend to show a series of complexes points up followed by complexes points down, often with a narrow waist between.
[Fr. torsade, fringe, twist, or coil, + pointe, point or tip]

torsade de pointes

(tor-sad'de pwont')
A rapid, unstable form of ventricular tachycardia in which the QRS complexes appear to twist, or shift, electrical orientation around the isoelectric line of the electrocardiogram. It often occurs as a life-threatening effect of a medication (such as quinidine, amiodarone, or a tricyclic antidepressant) that prolongs the Q-T interval but may also complicate congenital long QT syndromes. Intravenous magnesium sulfate may be used to treat this arrhythmia.
Synonym: polymorphic ventricular tachycardia
References in periodicals archive ?
15% patients were having severe hypomagnesaemia and all of these patients have torsade de pointes as the presenting arrhythmia suggesting that severe hypomagnesaemia is an important cause of torsade de pointes.
Electrocardiography abnormalities such as atrial flutter, atrioventricular block, torsade de pointes, sinus tachycardia, QT prolongation, ST elevation, and T wave inversion were detected in seven patients.
Cardiac conduction defects or arrhythmias preceding SCD in KSS patients include QT-prolongation, Torsade de pointes, or polymorphic ventricular tachycardia.
A long QT interval, Brugada pattern or early repolarisation pattern suggests polymorphic VT (PMVT) or torsade de pointes.
The patients are likely to develop ventricular arrhythmias causing Torsade de pointes, syncope and sudden death.
The long QT interval syndromes and torsade de pointes.
QTc prolongation by psychotropic drugs and the risk of torsade de Pointes.
Torsade de pointes induced by short-term oral amiodarone therapy.
Dose-related effects of methadone on QT prolongation in a series of patients with torsade de pointes.
When the QT interval is prolonged, this means that electrical activity is spreading through the heart slightly slower, and this may carry a risk of triggering a rare condition of abnormal electrical activity known as torsade de pointes.
El bloqueo de salida de potasio prolonga la fase 3 del potencial de accion miocardico (repolarizacion), que resulta en un aumento de la duracion del intervalo QT, que incrementara el riesgo de desarrollar torsade de pointes [11].
Tricyclic antidepressants, QT interval prolongation, and torsade de pointes.