Vol 2 | Issue 1 | Jan-Apr 2016 | page:21-22 | Amarja Sachin Nagre, Nagesh Jambure, Vasanti Kelker, Sanhita Kulkarni, Amruta Tilwe.
Authers: Amarja Sachin Nagre, Nagesh Jambure, Vasanti Kelker, Sanhita Kulkarni, Amruta Tilwe.
 MGM Medical College and MCRI, Aurangabad, Maharashtra, India.
Address of Correspondence
Dr Amarja Sachin Nagre
MD DM FCA Cardiac Anaesthesia
Assistant Professor and Consultant
Mahatma Gandhi Mission Medical College And MCRI
Email – firstname.lastname@example.org
Introduction: Patient with permanent pacemaker for non cardiac surgery with incision over the pacemaker device and using magnet during the procedure are important features of our case.
Case Report: 60 years male, diabetic,hypertensive with H/o myocardial infarction 15 years back with pacemaker implanted in 2012 came for deltopectoral flap surgery.Intraoperative conversion of the pacemaker to asynchronous mode using magnet and various precautions to avoid pacemaker malfunction are the highlights of this case management.
Conclusion: Successful management of a patient with permanent pacemaker using magnet is possible with utmost care and precautions.
Keywords: Pacemaker, magnet, asynchronous.
Patients with permanent pacemaker for non cardiac surgery pose a considerable challenge .Challenges increase as distance of surgical site from the pacemaker decreases. We present a case with incision over the pacemaker device making it more complicated and usage of magnet during the procedure makes it noteworthy.
A 60 years old male presented with uncontrolled diabetes on oral hypoglycemic agents, hypertensive with H/o myocardial infarction 15 years back and pacemaker implanted for complete heart block before 3 years with pulse generator in right infraclavicular region. Patient had infection at local site so pulse generator was placed in left infraclavicular region. Recurrence of infection occurred exposing the pacemaker and hence patient was posted for deltopectoral flap under general anaesthesia. Preoperative assessment was done. Patient had good effort tolerance. Pulse : 64/minBP : 140/94 mm Hg. Blood investigations: Hb :15.9 gm% TLC :6290/cumm Fasting BSL :96mg/dl, Na :140 mEq/L, K : 3.8 mEq/L. ECG : Rate :62/minute, ST elevation in II and III. 2D ECHO showed ejection fraction: 55 % with grade II diastolic dysfunction. Pacemaker details-DDDR Pacemaker, inserted in 2012,Vitatron E60A1DR with pulse rate : 60-120 bpm and with adequate battery life.
All emergency drugs, defibrillator and temporary pacemaker were kept ready. Standard monitoring with ECG, NIBP,SpO2 and ETCO2 was done. Pacemaker was set to ASYNCHRONOUS mode using MAGNET at pulse rate of 70 bpm. Pre-oxygenation with 100% oxygen and induction was done with Inj. fentanyl 3µg/kg,Inj. propofol 0.5 mg/kg and Inj. vecuronium 0.1 mg/kg, intubated and mechanically ventilated with volume control mode. Maintainance of anesthesia was done with oxygen, air and isoflurane. Intraoperatively, Ringer lactate 1000 ml and 1 gm paracetamol infusion was given. Normotension, normocapnia, normothermia was maintained. Bipolar cautery was used in short bursts. Reversal was done with inj neostigmine 0.05 mg/kg and inj glycopyylorate 0.01 mg/kg .Pacemaker was reset to preoperative settings. All measures were taken to prevent shivering. 24 hours ICU monitoring was done and patient was discharged on 3rd postoperative day.
Pacemakers interpret electromagnetic interference (EMI) as intrinsic cardiac activity, not triggering the paced rhythm. EMI can damage the pulse generator. Dual chamber pacemakers are more susceptible than single chamber. Precautions to be taken are reprogramming to asynchronous mode by using magnet. The magnet is placed over the pulse generator to convert it in a non-sensing asynchronous mode with a fixed pacing rate called as magnet rate .Magnets are thus used to protect the pacemaker dependent patient during EMI such as electrocautery .Also, if pacemaker details are not available magnet may identify particular model with the help of magnet rate, which varies among different manufacturers and thus provide clue for its identification . Other precautions to be taken in these patients are shivering and myoclonic movements to be avoided. Also avoid succinylcholine, etomidate, ketamine, direct muscle stimulation, TENS, peripheral nerve stimulator. Electrocautery: Bipolar cautery preferred as current loops between the electrodes only  and does not pass through the whole body. Electrocautery should not be used within 15 cms of pacemaker device. Grounding plate should be away from pacemaker on same side of operative field and close to the surgical site, and it should not cross the body. Cautery should be used as short burst of < 2 sec with gap of minimum 10 seconds. Peripheral pulse must be continuously assessed. Increased risk of pulseless electrical activity remains. If malignant ventricular tachyarrythmias develop cardioversion or defibrillation is indicated with antero-posterior position of pads and away from the pacemaker site.
Safe and efficient management of a patient with pacemaker is possible by understanding the implantable system, pacemaker battery life and its indication. Need for conversion to asynchronous mode by using magnet and appropriate use of electrocautery should be done.
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|How to Cite this Article: Nagre AS,Jambure N, Kelker V, Kulkarni S, Tilwe A. Successful management of a patient with pacemaker for flap surgery of exposed pulse generator device using magnet. Journal of Anaesthesia and Critical Care Case Reports Jan-Apr 2016; 2(1):21-22.|