Post-operative cardiac arrest induced by co-administration of amiodarone and dexmedetomidine: a case report
© Ohmori et al. 2015
Received: 17 August 2015
Accepted: 13 October 2015
Published: 21 October 2015
We firstly report a postoperative hemodialysis patient who was co-administered with amiodarone and dexmedetomidine and developed severe bradycardia followed by cardiac arrest. A 79-year-old male patient underwent an amputation of the right lower extremity. The electrocardiogram of the patient showed a complete right bundle branch block with left anterior fascicular block before the anesthesia, and paroxysmal atrial tachycardia over 200 beats/min lasting 15 min was observed during surgery. After admission to the intensive care unit, the intensivist and the consultant cardiologist decided to treat tachycardia using amiodarone. The initial dosing of amiodarone and the maintenance infusion succeeded to decrease the heart rate. Approximately 2 h and a half after the start of dexmedetomidine infusion for sedation, the heart rate gradually declined and severe bradycardia suddenly followed by cardiac arrest was observed. Resuscitation was promptly initiated and the patient regained sinus rhythm without delay. In retrospective analysis, the monitoring record of the electrocardiogram revealed the marked atrioventricular conduction abnormalities. This is the first case report concerning a cardiac arrest induced by amiodarone and dexmedetomidine.
KeywordsAmiodarone Dexmedetomidine Cardiac arrest
Dexmedetomidine is one of well-known sedatives, and administration of dexmedetomidine has become a popular regimen in intensive care unit [1–3]. Dexmedetomidine has been considered as a preferable drug among intensivists because of it showing less respiratory and cardiovascular depression . Recently, the application of dexmedetomidine in clinical settings is expanding in Japan and in western countries . However, we previously reported that dexmedetomidine showed a fatal cardiovascular complication including cardiac arrest and reviewed the literature . Now, we firstly present another patient who developed severe bradycardia followed by cardiac arrest induced by the co-administration of amiodarone and dexmedetomidine.
The use of local anesthetics on the popliteal sciatic nerve block was planned. Using an ultrasound device, the nerve was identified, and the sufficient amount of analgesia was confirmed after the injection of 20 ml of 0.75 % ropivacaine and 20 ml of 2 % mepivacaine without any complications including paresthesia. Immediately after the beginning of surgery, the anesthesiologist administered propofol at a rate of 2 mg/kg/h; however, the blood pressure of the patient (94/60 mmHg) lowered to 62/42 mmHg, and the infusion was discontinued. During the anesthesia, sudden paroxysmal atrial tachycardia over 200 beats/min was observed. The tachycardia lasted approximately 15 min. The anesthesiologist started to prepare to administer an antiarrhythmic agent (detail was unknown), but the heart rate decreased before the intervention.
The dexmedetomidine infusion was continued for 2 h and a half. Then, the heart rate suddenly decreased to 40 beats/min. The complete atrioventricular block along with ectopic rhythm was followed by sinus arrest without escaped beat was occurred (Fig. 2, lower row). Cardiopulmonary resuscitation was promptly initiated. One milligram of epinephrine was administered three times during chest compression and emergency orotracheal intubation. Recovery of spontaneous circulation was observed within 8 min, and the patient regained sinus rhythm and appropriate blood pressure. Mechanical ventilation was started, and spontaneous respiration was observed. Continuous hemodiafiltration was applied for correcting volume abnormalities caused by resuscitation. Immediately after the resuscitation, blood gas analysis showed acidemia (pH 7.05) and hyperlactatemia (13.3 mmol/l); however, both abnormalities disappeared quickly. The infusion of dexmedetomidine was aborted.
Next morning, the patient’s trachea was extubated without any neurological complications. At post-operative day 3, slight liver dysfunction was revealed by laboratory examinations; however, the general condition was improved. The patient was moved to the general ward at post-operative day 6 and discharged to the former hospital at day 10 in good course.
This is the first case report describing a patient presenting cardiac arrest induced by amiodarone and dexmedetomidine. Both drugs are considered as negative chronotropic agents and would suppress the cardiac conduction system. The additive or synergistic interaction on the impulse conduction was strongly suspected for the etiology of cardiac arrest. The preoperative electrocardiogram of the patient showed conduction abnormality, e.g., complete right bundle branch block with left anterior fascicle block, and the conduction dysfunction might be a risk factor for administration of the drugs . We should pay more attention to the possibility of bradycardia; however, the heart rate of the patient showed a consistent tendency of tachycardia before the event.
Amiodarone is one of the most popular antiarrhythmic drugs and widely used . The applicable arrhythmia of amiodarone includes ventricular arrhythmia, e.g., ventricular premature beat, ventricular tachycardia, and supraventricular arrhythmia, e.g., tachycardia with atrial fibrillation. Although amiodarone showed a wide spectrum of antiarrhythmic effect, a variety of complications has been reported on the organs, including the heart, thyroid, liver, eyes, and lungs [8, 9]. The most common complication is bradycardia or conduction disturbance and sympathetic β blocking effect . Kim et al.  reviewed that amiodarone-induced bradycardia and atrioventricular block were common adverse effects of amiodarone owing to the calcium channel blocking activity. Amiodarone also significantly prolongs ventricular repolarization, i.e., QTc interval , and the effect was consistent with the change in the electrocardiogram of the current patient.
A fatal arrhythmia, ventricular tachycardia, is one of the most recommended conditions to administer amiodarone. We could not find any report describing that amiodarone itself induces cardiac arrest. Tsimogianni et al.  reported that administration of itraconazole provoked cardiac arrest in a patient administered with amiodarone. The patient received amiodarone for a treatment of ischemic stroke associated with atrial fibrillation. The administration of itraconazole induced hypotension and subsequent cardiac arrest. The same episode was observed 2 months later, and the antifungal treatment was changed to caspofungin.
Dexmedetomidine decreases heart rate. An incidence of severe bradycardia might be rare [13, 14]; however, we suspect that some of the cases with atrioventricular block induced by the administration of dexmedetomidine were overlooked [5, 15]. Moderate bradycardia with atrioventricular block would be misdiagnosed as a slow sinus rhythm in bipolar electrocardiography monitoring . Usually, intensivists might pay attention to the value of the heart rate, not the pattern of the electrocardiogram. Dexmedetomidine reduces heart rate without a prolongation of the QT interval; thus, QTc interval is shortened [17, 18]. Although the apparent antiarrhythmic effect of dexmedetomidine in human is not known, a possibility of preventing the effect against ventricular tachycardia was demonstrated in animal experiment . Recently, Narisawa et al.  demonstrated that dexmedetomidine sedation reduced the incidence of postoperative atrial fibrillation in cardiovascular surgery patients.
Administration of dexmedetomidine to a patient receiving negative chronotropic drugs should be re-considered, and further attention and intensive monitoring are absolutely required.
Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
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- Ozaki M, Takeda J, Tanaka K, Shiokawa Y, Nishi S, Matsuda K, et al. Safety and efficacy of dexmedetomidine for long-term sedation in critically ill patients. J Anesth. 2014;28:38–50.PubMed CentralView ArticlePubMedGoogle Scholar
- Adams R, Brown GT, Davidson M, Fisher E, Mathisen J, Thomson G, et al. Efficacy of dexmedetomidine compared with midazolam for sedation in adult intensive care patients: a systematic review. Br J Anaesth. 2013;111:703–10.View ArticlePubMedGoogle Scholar
- Pandharipande PP, Sanders RD, Girard TD, McGrane S, Thompson JL, Shintani AK, et al. MENDS investigators. Effect of dexmedetomidine versus lorazepam on outcome in patients with sepsis: an a priori-designed analysis of the MENDS randomized controlled trial. Cirt Care. 2010;14:R38.View ArticleGoogle Scholar
- Keating GM. Dexmedetomidine: a review of its use for sedation in the intensive care setting. Drugs. 2015;75:1119–30.View ArticlePubMedGoogle Scholar
- Takata K, Adachi YU, Suzuki K, Obata Y, Sato S, Nishiwaki K. Dexmedetomidine-induced atrioventricular block followed by cardiac arrest during atrial pacing: a case report and review of the literature. J Anesth. 2014;28:116–20.View ArticlePubMedGoogle Scholar
- Surawicz B, Childers R, Deal BJ, Gettes LS, Bailey JJ, Gorgels A, et al. AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: part III: intraventricular conduction disturbances: a scientific statement from the American Heart Association Electrocardiography and Arrhythmias Committee, Council on Clinical Cardiology; the American College of Cardiology Foundation; and the Heart Rhythm Society: endorsed by the International Society for Computerized Electrocardiology. Circulation. 2009;119:e235–40.View ArticlePubMedGoogle Scholar
- Kudenchuk PJ, Brown SP, Daya M, Morrison LJ, Grunau BE, Rea T, et al. Resuscitation Outcomes Consortium-Amiodarone, Lidocaine or Placebo Study (ROC-ALPS): rationale and methodology behind an out-of-hospital cardiac arrest antiarrhythmic drug trial. Am Heart J. 2014;167:653–9.PubMed CentralView ArticlePubMedGoogle Scholar
- Haffajee CI, Love JC, Alpert JS, Asdourian GK, Sloan KC. Efficacy and safety of long-term amiodarone in treatment of cardiac arrhythmias: dosage experience. Am Heart J. 1983;106:935–43.View ArticlePubMedGoogle Scholar
- Nademanee K, Singh BN, Hendrickson J, Intarachot V, Lopez B, Feld G, et al. Amiodarone in refractory life-threatening ventricular arrhythmias. Ann Intern Med. 1983;98:577–84.View ArticlePubMedGoogle Scholar
- Kim HL, Seo JB, Chung WY, Kim SH, Kim MA, Zo JH. The incidence and predictors of overall adverse effects caused by low dose amiodarone in real-world clinical practice. Korean J Intern Med. 2014;29:586–96.Google Scholar
- Kotake Y, Kurita T, Akaiwa Y, Yasuoka R, Motoki K, Kobuke K, et al. Intravenous amiodarone homogeneously prolongs ventricular repolarization in patients with life-threatening ventricular tachyarrhythmia. J Cardiol. 2015;161–7.
- Tsimogianni AM, Andrianakis I, Betrosian A, Douzinas E. Cardiac arrest provoked by itraconazole and amiodarone interaction: a case report. J Med Case Rep. 2011;5:33.
- Shah AN, Koneru J, Nicoara A, Goldfeder LB, Thomas K, Ehlert FA. Dexmedetomidine related cardiac arrest in a patient with permanent pacemaker; a cautionary tale. Pacing Clin Electrophysiol. 2007;30:1158–60.View ArticlePubMedGoogle Scholar
- Bharati S, Pal A, Biswas C, Biswas R. Incidence of cardiac arrest increases with the indiscriminate use of dexmedetomidine: a case series and review of published case reports. Acta Anaesthesiol Taiwan. 2011;49:165–7.View ArticlePubMedGoogle Scholar
- Nagasaka Y, Machino A, Fujikake K, Kawamoto E, Wakamatsu M. Cardiac arrest induced by dexmedetomidine. Masui. 2009;58:987–9.PubMedGoogle Scholar
- Aoyama Y, Nakahara K, Yoshida T, Shioya Y, Adachi Y, Matsuda N. Dexmedetomidine-induced atrioventricular block in a patient staying in intensive care unit. Jpn J Clin Anesth. 2015;39:653–4.Google Scholar
- Kato H, Krishna SG, Sebastian R, Smith K. Effect of dexmedetomidine on the QT interval in pediatric patients undergoing general anesthesia. J Anesth [Epub ahead of print].
- Kim HL, Seo JB, Chung WY, Kim SH, Kim MA, Zo JH. Effect of dexmedetomidine on the corrected QT and Tp-e intervals during spinal anesthesia. Yonsei Med J. 2014;55:517–22.PubMed CentralView ArticlePubMedGoogle Scholar
- Tsutsui K, Hayami N, Kunishima T, Sugiura A, Mikamo T, Kanamori K, et al. Dexmedetomidine and clonidine inhibit ventricular tachyarrhythmias in a rabbit model of acquired long QT syndrome. Cir J. 2012;76:2343–7.View ArticleGoogle Scholar
- Narisawa A, Nakane M, Kano T, Momose N, Onodera Y, Akimoto R, et al. Dexmedetomidine sedation during the nighttime reduced the incidence of postoperative atrial fibrillation in cardiovascular surgery patients after tracheal extubation. J Intensive Care. 2015;3:26.PubMed CentralView ArticlePubMedGoogle Scholar