Background: Perioperative arrhythmia is a common general anesthesia complication of cardiothoracic surgeries. Sudden or acute onset of life threatening perioperative arrhythmias are rare clinical events in non-cardiac surgical patients.1,2 Electrolytes imbalance, particularly hypokalemia and dyskalemia, is one of the main possible underlining cause for the occurrence of these arrhythmias.3,4,5 We present two cases of severe hypokalemia leading to life threatening cardiac arrhythmias in the post-operative period. Case 1: A 30-year old healthy female patient without significant past medical history had emergency laparoscopic cholecystectomy and appendicectomy. Pre- and intra-operative periods were uneventful. Her pre-operative potassium level was 3.7 mmol/L. 18 hours post-operatively, she suddenly developed palpitations and went into ventricular fibrillation (VF) cardiac arrest. Cardiopulmonary resuscitation (CPR) was initiated followed by defibrillation which reverted the heart to a sinus rhythm. She was transferred to the intensive care unit (ICU) sedated and connected to the ventilator. In ICU, her serum electrolytes showed severe hypokalemia (serum potassium level 2.2 mmol/L) (Figure 1) so she was immediately started on 20 mmol of potassium chloride (KCl) over 30 minutes through central venous catheter (CVC) with complementary intravenous fluids with KCl. In the next 36 minutes she had four episodes of VF requiring CPR and defibrillation with a positive outcome. She received amiodarone infusion as well as continuous KCl supplementation and calcium gluconate 2 g. She received 100 mmol of KCl in 6 hours and a total of 220 mmol of KCl in 24 hours, and then she became stable. She was extubated after 48 hours. Echocardiogram and cardiac conduction studies showed no pathological changes. Cardiac conduction studies (electrophysiology study - EPS) were normal. She was discharged home and followed in the outpatient clinic. Case 2: A 78-year old known hypertensive male patient on angiotensin converting enzyme inhibitors was admitted to intensive care unit (ICU) for observation after laparoscopic cholecystectomy. Pre-operative serum electrolytes were within normal range. After one hour he started to have tachycardia and then went into pulseless ventricular tachycardia requiring defibrillation. His serum electrolytes results showed severe hypokalemia (2.4 mmol/L) (Figure 1) so this was corrected by rapid potassium chloride administration through CVC and supplementation of KCl in intravenous fluids. After 10 minutes he went into VF requiring defibrillation and a bolus of amiodarone. In the next 20 minutes he had three more episodes of VF requiring CPR and defibrillation.In six hours he required 90 mmol of KCl to reach a serum potassium level of 3.7 mmol/L. A total of 210 mmol of KCl was needed in 24 hours. He was extubated after 24 hours. He was transferred to the ward on day 3 and discharged home on day 6, and later followed in the outpatient clinic. Conclusion: Perioperative severe hypokalemia can lead to life threatening...

Necrotizing fasciitis (NF) is a surgical emergency characterized by a fulminant course and high mortality rate. NF is a severe form of soft-tissue infection. When NF is complicated with acute myocardial infarction (AMI), acute respiratory distress syndrome (ARDS), and acute kidney injury (AKI), the patient's chance of survival are diminished significantly. We present a case of NF of the abdominal wall with acute non-ST segment elevated myocardial infarction (NSTEMI). No such case has previously been reported according to our review of the literature. Case: A 52-year-old female with a known case of hypothyroidism presented to the emergency department with severe abdominal pain for two days. She gave the history of abdominal hernia repair ten days back. She had sinus tachycardia but other vitals were normal, with no fever or leucocytosis. Computed Tomography (CT) of the abdomen showed anterior abdominal wall collections. Septic workup was done, cefuroxime and metronidazole were started. Her abdominal wall collection was drained under image guidance. After a few hours, her blood pressure dropped and was not responding to fluid challenges so a noradrenaline infusion was started and she was transferred to the surgical intensive care unit (SICU). Her blood work showed lactic acidosis. Her abdomen was tender all over with swelling and induration of the abdominal wall. Antibiotics were changed to meropenem and clindamycin to broaden the spectrum in view of the septic shock and she was immediately taken for exploratory laparotomy. The operative findings were suggestive of necrotizing fasciitis of the anterior abdominal wall and a bold and thorough debridement was done. She was kept intubated and ventilated for a second look and further debridement was conducted after 24 hours. Six-hours post-surgical debridement, electrocardiographic (ECG) changes were noticed, 12-lead ECG showed ST-segment depression in leads II, III, aVF, and V5-6, with raised cardiac biomarkers and lower cardiac index (), diagnosed as NSTEMI. Heparin infusion, aspirin, and clopidogrel were started. Echocardiogram showed moderate left ventricular systolic dysfunction (ejection fraction: 45%) with septal dyskinesia. Dobutamine infusion (guided by the PiCCO study) was started, which improved her hemodynamic parameters. CT coronary angiography was inconclusive. These findings suggested that she suffered Type II myocardial infarction due to the stress. She developed oliguria which improved with the restoration of hemodynamics. Her lung condition also deteriorated (PaO2/FiO2 ratio dropped to 100), requiring maximum ventilatory support and she was managed as per ARDS guidelines. Blood culture showed growth of Group F Streptococci and Prevotella melaninogenica. Meropenem was continued as the growths were sensitive to it. By day six, she started to be weaned off from the ventilator and vasopressors. She was extubated on day nine and transferred to the ward on day ten. She was later discharged home to be followed up in the surgical outpatient clinic. Her length of stay was 15 days. On a six-month follow-up, she was functionally independent, on aspirin, clopidogrel, and thyroxin therapy. Conclusion: Our patient had NF of the anterior abdominal wall leading to septic shock and complicated by NSTEMI, ARDS, and AKI. Timely source control, close monitoring, quick, and effective interventions appear to have resulted in her excellent recovery.