Martin Stritesky

Comparison of Three Protocols for Tight Glycemic Control in Cardiac Surgery Patients

OBJECTIVE We performed a randomized trial to compare three insulin-titration protocols for tight glycemic control (TGC) in a surgical intensive care unit: an absolute glucose (Matias) protocol, a relative glucose change (Bath) protocol, and an enhanced model predictive control (eMPC) algorithm. RESEARCH DESIGN AND METHODS A total of 120 consecutive patients after cardiac surgery were randomly assigned to the three protocols with a target glycemia range from 4.4 to 6.1 mmol/l. Intravenous insulin was administered continuously or in combination with insulin boluses (Matias protocol). Blood glucose was measured in 1- to 4-h intervals as requested by the protocols. RESULTS The eMPC algorithm gave the best performance as assessed by time to target (8.8 ± 2.2 vs. 10.9 ± 1.0 vs. 12.3 ± 1.9 h; eMPC vs. Matias vs. Bath, respectively; P < 0.05), average blood glucose after reaching the target (5.2 ± 0.1 vs. 6.2 ± 0.1 vs. 5.8 ± 0.1 mmol/l; P < 0.01), time in target (62.8 ± 4.4 vs. 48.4 ± 3.28 vs. 55.5 ± 3.2%; P < 0.05), time in hyperglycemia >8.3 mmol/l (1.3 ± 1.2 vs. 12.8 ± 2.2 vs. 6.5 ± 2.0%; P < 0.05), and sampling interval (2.3 ± 0.1 vs. 2.1 ± 0.1 vs. 1.8 ± 0.1 h; P < 0.05). However, time in hypoglycemia risk range (2.9–4.3 mmol/l) in the eMPC group was the longest (22.2 ± 1.9 vs. 10.9 ± 1.5 vs. 13.1 ± 1.6; P < 0.05). No severe hypoglycemic episode (<2.3 mmol/l) occurred in the eMPC group compared with one in the Matias group and two in the Bath group. CONCLUSIONS The eMPC algorithm provided the best TGC without increasing the risk of severe hypoglycemia while requiring the fewest glucose measurements. Overall, all protocols were safe and effective in the maintenance of TGC in cardiac surgery patients.

Interventional treatment of pain in refractory angina. A review

BACKGROUND Refractory angina is characterized by repeated attacks of chest pain in patients on maximal anti-anginal pharmacotherapy, with a professional conscensus that further surgical or radiological revascularization would be futile. Refractory angina is a serious but relatively uncommon health problem, with a reported incidence of approximately 30 patients per million people/year. In this condition simply treating the associated pain alone is important as this can improve exercise tolerance and quality of life. METHODS An extensive literature search using five different medical databases was performed and from this, eighty-three papers were considered appropriate to include within this review. RESULTS AND CONCLUSION Available literature highlights several methods of interventional pain treatment, including spinal cord stimulation and video-assisted upper thoracic sympathectomy which can provide good analgesia whilst improving physical activities and quality of life. The positive effect of spinal cord stimulation on the intensity of pain and quality of life has been confirmed in nine randomized controlled trials. Other potential treatment methods include stellate ganglion blocks, insertion of thoracic epidural or spinal catheters and transcutaneous electrical nerve stimulation. These approaches however appear more useful for diagnostic purposes and perhaps as short-term treatment measures.

Hepatic tear as an elusive cause of hemoperitoneum complicating cardiac surgery

We report an unusual source of intra-operative bleeding in a patient undergoing cardiosurgical reoperation. After sternotomy, hematocrit dropped significantly. Only intra-thoracic bleeding from adhesions was considered to be responsible for the anemia. During reperfusion, abdominal wall was distended with a bluish bulge in the right hemidiaphragm. Immediate laparotomy revealed bleeding from a tear in the right hepatic lobe without any diaphragm injury. The tear was likely caused by blunt trauma from an oscillating saw. We emphasize cautious use of an oscillating saw in patients with hepatic congestion undergoing a repeat sternotomy. We propose that lifting the sternum in redo procedures might prevent the hepatic tear.

Use of high-thoracic epidural analgesia in pulmonary endarterectomy: a randomized feasibility study.

BACKGROUND The suitability of combined high-thoracic epidural anesthesia for pulmonary endarterectomy was studied. METHODS A prospective randomized clinical study was conducted in a university medical center from November 2005 to December 2006. The primary endpoint of this study was to evaluate perioperative hemodynamic data; secondary endpoints were to evaluate the duration of artificial ventilation, length of stay in the intensive care unit, and the impact on postoperative morbidity and mortality. RESULTS The 16 patients in the study group received high-thoracic epidural anesthesia plus general anesthesia; the 16 control patients received total intravenous anesthesia alone. Hemodynamic parameters and drug use, as well as the time to extubation, rate of complications, postoperative pain, the length of intensive care unit stay, and mortality, were recorded. The 2 groups were comparable with respect to hemodynamic stability during induction of anesthesia. The study group patients had significantly lower sufentanil consumption (mean +/- SD, 2.1 +/- 0.7 microg/kg versus 9.1 +/- 3.1 microg/kg; P <.001), a shorter period of artificial ventilation (34 +/- 35 hours versus 52 +/- 49 hours; P = .0318), and lower postoperative pain scores at 3 hours (0.10 +/- 0.26 versus 0.93 +/- 1.38; P = .015), 12 hours (0.14 +/- 0.53 versus 0.93 +/- 0.79; P = .002), and 24 hours (0.35 +/- 0.49 versus 1.33 +/- 1.04; P = .007). CONCLUSIONS This study has shown that combined epidural and general anesthesia is a suitable anesthetic option in patients who are selected for pulmonary endarterectomy. It provides hemodynamic stability and reduces the duration of tracheal intubation postoperatively and improves postoperative pain relief, although this option has not been shown to decrease either the length of the intensive care unit stay or mortality.

Port access video-assisted proximal anastomosis with the symmetry aortic connector in MIDCABG procedure

We present an alternative way to create a video-assisted port access proximal anastomosis in the ascending aorta with the Symmetry Bypass System Aortic Connector (St. Jude Medical ATG, St. Paul, MN). This technique was successfully used in a patient undergoing urgent minimally invasive direct coronary artery bypass grafting (MIDCABG), in whom the left internal mammary artery was not harvested owing to subtotal occlusion of the left subclavian artery. Port access use of mechanical anastomotic devices may increase the indications for minimally invasive coronary artery surgery.