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  • Title: Incidence and type of cardiac arrhythmias in critically ill patients: a single center experience in a medical-cardiological ICU.
    Author: Reinelt P, Karth GD, Geppert A, Heinz G.
    Journal: Intensive Care Med; 2001 Sep; 27(9):1466-73. PubMed ID: 11685339.
    Abstract:
    OBJECTIVE: To determine the frequency and types of significant, sustained arrhythmias in a mixed ICU. DESIGN AND SETTING: Prospective, observational study in a medical-cardiological-postoperative ICU at a university hospital. PATIENTS: 133 consecutive patients with arrhythmias. MEASUREMENTS AND RESULTS: All patients had continuous ECG monitoring and automatic arrhythmia detection. We assessed: (a) sustained (>30 s) tachyarrhythmias; (b) all tachyarrhythmias requiring therapy; (c) bradycardias of fewer than 40 beats/min or requiring intervention. There were 310 arrhythmia episodes: 278 tachyarrhythmias (108 narrow-QRS complex, 168 wide-QRS complex; 179 regular, 97 irregular) and 32 bradycardias. Of the 278 tachycardias in 54 patients, 135 (48.6%) were ventricular. There were 13 episodes of torsade de pointes (4.67%) in five patients. Of the 278 tachycardiac episodes 83 were atrial fibrillation (29.8%, 63 patients), 10 atrial flutter (3.6%, 8 patients), 21 supraventricular tachycardias (7.55%, 7 patients), and 2 ectopic junctional tachycardia (0.72%, 1 patient). The number of patients showing significant arrhythmias was comparable over the years (11-12/1996: 4/28 [14.3], 1997: 52/302 [17.2%], 1998: 55/286 [19.2%], 22/140 [15.7%] 1-7/1999). The ICU stay was significantly longer in arrhythmia patients than in 623 patients without arrhythmias (median 4 vs. 14 days), and there was a trend towards higher mortality (40/133, 30.8%, vs. 132/623, 21.2%, P=0.061, log-rank). CONCLUSION: Only one-fifth of patients in this mixed ICU had significant arrhythmias, taking a contemporary definition of arrhythmias. Ventricular tachycardia and atrial fibrillation were the most frequent arrhythmias.
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