Single-Stitch Fixation of Coronary Artery Perfusion Cannulas

A relatively simple and safe method for fixation of coronary perfusion cannulas is described and illustrated.     

Treatment of Malignant Pleural Effusion: A Method Using Tube Thoracostomy and Talc

Our experience with a simple bedside method for controlling recurrent symptomatic malignant pleural effusion is presented. The method consists of intercostal tube thoracostomy, instillation of a suspension of talc, and waterseal suction drainage. Based on our experience, we believe certain criteria should be met before undertaking talc pleurodesis. In properly selected patients the results with tube thoracostomy and talc pleurodesis have been uniformly good in preventing fluid recurrence and return of disabling symptoms. The technique and results are discussed.     

Selective intracavitary and coronary profound hypothermic cardioplegia for myocardial preservation: a new technique.

A technique is described for selective intracavitary and coronary hypothermic perfusion during cardiac bypass with cardioplegia to facilitate cardiac operations. A cold perfusate (Plasmalyte 148 and mannitol, 12.5 gm/L at 8 degrees to 10 degrees C) is administered with the aid of a low-flow perfusion pump into the left ventricular cavity and coronary circulation through an apical perfusion-venting (Per-Vent) catheter. This perfusate cools the myocardium rapidly and homogeneously to a temperature of 15 degrees to 20 degrees C. Within this temperature range, complete cardioplegia occurs and the safe ischemia period can be extended to 120 minutes. This method was applied in 50 unselected consecutive adult patients undergoing aortocoronary saphenous vein bypass grafting or aortic or mitral valve replacement. All patients survived and had excellent recovery of ventricular function.     

Pacemaker wire extension for permanent and temporary pacing

A pacemaker wire extension was designed and used for temporary pacing in the postoperative period following open-heart operations. When permanent pacing became indicated, the exteriorized extension was removed and the pacemaker was connected to the permanent electrode and placed subcutaneously. This extension wire eliminated repeat thoracotomy following tricuspid valve replacement and enabled us to implant one reliable set of wires to the myocardium. The extension is easily removed using firm traction (Cordis) or local anesthesia (Medtronic).     

Tracheal Blood Supply

Perioperative and late follow-up hemodynamic cardiovascular studies to assess the effects of direct myocardial revascularization on cardiac function objectively have been completed on 51 patients. Analysis of the data delineated three distinct groups based on the pattern of their early postoperative recovery. Group I patients (12) had a hyperdynamic cardiovascular response to operation and returned to a normal physiological range of cardiac function within 24 hours. Group II patients (24) initially had moderate to severe myocardial decompensation postoperatively but responded to inotropic support and moved into the normal physiological range within 24 to 48 hours. Group III patients (15) had severe, prolonged myocardial decompensation with little response to inotropic support. There were no early deaths in Group I, 1 early iatrogenic death in Group II, and 2 deaths from sepsis, 1 in Group I and 1 in Group II. All 7 cardiogenic deaths occurred in Group III patients. Late follow-up studies 4 to 23 months postoperatively have been completed on 29 patients. These showed cardiovascular stability in the mean values in Groups I and II. Significant improvement in mean cardiac function was seen in surviving Group III patients.     

Pericardial Decompression

Pericardial tamponade and chronic pericardial effusion were treated in 32 patients by creating a subxiphoid pericardial window under local anesthesia in preference to pericardiocentesis or pericardiectomy. Chest roentgenograms, fluoroscopy, and cardiac catheterization as standard clinical methods of diagnosis have been largely replaced by echocardiography as the most sensitive method for detecting pericardial effusion. Eleven patients had pericarditis of viral, uremic, or purulent origin. Two had intrapericardial hemorrhage following catheter perforation of the heart. Four had pericardial effusion associated with cardiomyopathy and rheumatoid arthritis. In the remaining 15 patients malignancy was the cause of tamponade. In 10 patients we attempted to control the effusion initially with pericardiocentesis. Five of these (50%) required an additional procedure. In 22 patients subxiphoid pericardial decompression was the primary method of treatment; there were no fatalities during or immediately following operation. None of these patients has had any recurrence of tamponade or effusion for up to three years.     

Improved cardiovascular hemodynamics with atrioventricular sequential pacing compared with ventricular demand pacing

To determine the advantages of atrioventricular (AV) sequential pacing over ventricular demand pacing, paired cardiovascular hemodynamic studies were performed in each pacing mode at a constant heart rate. The paired studies included determination of ejection fraction (EF) by echocardiography and gated blood pool radionuclide scanning, and of cardiac output (CO) by the indicator-dilution method. There was no significant difference in EF with either pacing mode. Determined by echocardiography, EF with AV sequential pacing was 57% compared with 56% with ventricular demand pacing; by the gated blood pool method, EF with AV sequential pacing was 58% compared with 57% in the ventricular mode. Significant improvement with AV sequential pacing was seen in CO (4.75 L/min from 3.75 L/min; p less than 0.01); stroke volume (58 ml from 48 ml; p less than 0.02); arteriovenous oxygen content difference (4.9 vol% from 5.6 vol%; p less than 0.01); total peripheral resistance (1,724 dynes sec cm-5 from 2,025 dynes sec cm-5; p less than 0.01); and cardiac contractility, as reflected by mixing time (6.9 seconds from 8.0 seconds; p less than 0.02). No significant changes were noted in mean arterial or atrial pressure or in systemic oxygen consumption. In a second group of 6 patients, similar paired studies were done in AV sequential pacing modes before and after therapeutic reduction of total peripheral resistance. A significant increase in CO (43%) was observed following reduction in total peripheral resistance. We conclude that AV sequential pacing improves CO more effectively than ventricular demand pacing. Cardiac output can be further enhanced in patients with congestive heart failure by pretreatment with agents to reduce total peripheral resistance.     

A permanent experimental model for reversible myocardial anoxia

A new permanent preparation for studying myocardial response to reversible ischemia was defined and characterized in 46 dogs. The left mammary artery was anastomosed to the second diagonal branch of the left anterior descending coronary artery. The artery distal to the anastomosis served as the sole vascular supply for a myocardial pedicle created by a simultaneous incision and suture technique. The venous drainage was left intact, draining blood to the great cardiac vein and coronary sinus.The pedicles so constructed were an anatomically defined myocardial segment with an independent yet controllable vascular supply that maintained viable, functioning tissue. Functional continuity with surrounding myocardium was preserved. There was no damage to adjacent tissue. Overall ventricular function was maintained, and permanent preparations were readily available for study. Occlusion of the mammary artery for a 15-minute period produced structural and functional changes that were completely reversible with 30 minutes of revascularization. Sixty minutes of occlusion produced severe morphological and functional damage that was only slightly reversible. Additional applications of the model are discussed.     

Internal Mammary Artery Cannulation

A technique of internal mammary artery cannulation is described. This approach offers a safe method for arterial monitoring in infants undergoing thoracotomy for palliative cardiac procedures.     

Decompression of the heart with siphon drainage

A simple technique for inducing intracavitary hypothermic cardioplegia and decompressing the left heart through the ascending aorta is presented. The technique is based on siphon drainage, which eliminates the dangers of air embolism.     

Epicardial atrial pacing

A modification of the technique for placing a permanent epicardial electrode to the atrium is described. It results in long-term atrial pacing and low sensing thresholds. The method requires meticulous surgical technique but is reliable, safe, and free from serious or long-term complications.     

Cold blood--potassium cardioplegia

A technique is described for providing myocardial protection utilizing oxygenated blood that is drawn from the pump oxygenator and passed through two disposable cardioplegic cooling coils, which are joined in series and submerged in ice slush. A potassium-containing cardioplegic solution is run into the oxygenated blood at the level of the cooling coils. The amount of blood used in the blood-potassium cardioplegic mixture is controlled using a screw clamp. This method has been used with excellent results in 150 consecutive patients undergoing aortocoronary saphenous vein bypass grafting.     

Comparison of myocardial preservation techniques for aortocoronary bypass surgery.

The myocardial properties of three different techniques for cardiac arrest during aortocoronary bypass surgery were analyzed. Ventricular fibrillation and moderate total body hypothermia (30–33°C) (Group I) was found to be an insecure method of preservation. It produced a high incidence of focal irreversible ultrastructural changes (7 of 10 patients), high post-bypass CK-MB levels (mean 85.54 U/liter) indicative of myocardial damage, and impaired clinical and physiologic recovery courses. Six out of ten patients needed inotropic support, three had prolonged stay in ICU, and three patients showed Type III (unacceptable) recovery trajectories, one of whom died of myocardial decompensation four weeks after surgery. This method, which was the most common one used in our institution, was completely abandoned as a result of these studies. Potassium induced cardioplegia combined with methylprednisolone sodium succinate, hypertonic glucose and intermittent moderate topical cooling (25–27°C) of the heart (Group III) offered a generally acceptable form of myocardial protection, as only one patient showed irreversible ultrastructural changes. The mean post-bypass CK-MB level was only moderately elevated (mean 22.32 U/liter), but seven of ten patients needed inotropic support. There were no Type III recovery trajectories and two patients showed an optimal Type I recovery. Only one patient had a prolonged stay in ICU, and another patient exhibited electrocardiographic evidence of a perioperative myocardial injury pattern. Selective intracavitary profound hypothermic arrest (15–18°C) (SIPHA) offered the best myocardial protection as evidenced by remarkably well preserved ultrastructure and significantly (P< 0.005) lower post-bypass CK-MB levels (mean 7.85 U/L). All SIPHA patients had acceptable physiologic recovery trajectories of the Type I or Type II with minimal need for inotropic support (one patient), and none had a Type III recovery.These data also suggest that the major determinant of a successful myocardial preservation is the level of myocardial layer temperature, being best at the lowest temperature (15–18°C), worst at the highest temperature (30–33°C) and intermediate at 25–27°C. Additional injury may also be induced by ventricular fibrillation which by itself increases myocardial metabolic demands.     

A Modified Sternal Retractor for Exposure of the Internal Mammary Artery

This report describes the use of a modified chest wall rake retractor used to provide better exposure of the internal mammary artery (IMA). The instrument is easy to use and has been associated with minimal complications. It facilitates the harvesting of the IMA for use in coronary artery bypass grafting and provides better visualization of the retrosternal area for control of hemostasis.     

Chylothorax after Myocardial Revascularization with Internal Mammary Graft

Chylothorax following an intrapericardial cardiac operation is rare, and we are aware of only 12 reported cases. Nine followed median sternotomy for treatment of congenital heart disorders or acquired valvular disease; more than expected were reoperations (23%). This report documents that this complication may also occur following myocardial revascularization with internal mammary graft and describes the anatomy that makes this possible. This rare complication is important because of the high morbidity of prolonged tube drainage and the fact that nearly half of the affected patients underwent reoperation (5 of 13). Dilated lymphatics exuding chyle have been found at operations undertaken to control lymph fistulas and were located in anterior thymic tissue previously divided by electrocautery. Awareness of the significance of lymph encountered during cardiac operations, particularly during reoperation and near the origin of the internal mammary artery, may alert the surgeon that the stage is set for a disabling complication. Electrocautery may be an unreliable means of control as lymph contains little coagulable material; suture is recommended instead.     

Late Patency of the Internal Mammary Artery as a Coronary Bypass Conduit

From January, 1972, through August, 1977, 472 patients had internal mammary artery (IMA) coronary bypass, of which 100 were double-IMA bypasses. We selected those patients having a widely patent IMA one year postoperatively who then had a second catheterization 49 to 105 (mean, 64) months following operation. None of the 93 patients who met these criteria was specifically recalled for this study; they all had follow-up catheterizations for multiple other reasons. All of the 91 left IMA and 22 right IMA bypasses (total, 113) were patent at late catheterization, but 1 right IMA was diffusely narrowed. One left IMA had acute angulation with 50% stenosis proximal to the distal anastomosis, which was unchanged over the follow-up interval. There were 100 patent saphenous vein bypasses at one year and 87 at late catheterization.Late closure of coronary bypass grafts is secondary to progression of coronary disease, atherosclerosis of the bypass conduit, or intimal proliferation. Because we have not encountered the latter two causes of conduit closure, IMA grafts remain our graft of choice for nonemergent operations in patients under 60 years of age having revascularization of the left anterior descending coronary artery system.     

Correction of transposition of the great arteries in infants under surface-induced deep hypothermia

Thirty-five infants with transposition of the great arteries underwent primary surgical repair. There were 2 deaths in the 20 infants with uncomplicated transposition of the great arteries and 5 deaths among the 15 infants with complex transposition. Patients with pulmonary vascular disease and an intact ventricular septum present a higher risk, but it is our policy to repair the defect in these patients since normal hemodynamics and full oxygen saturations following correction protect them against cerebrovascular accidents.     

Experience with Internal Mammary Artery Grafts in 298 Patients

The internal mammary artery (IMA) was used as a graft in 298 patients undergoing coronary bypass procedures. Two patients died during the operative period and 2 others died one year later. Most of the survivors are free of angina. Of the IMAs restudied 9 to 24 months postoperatively, 95% were patent. This group included nearly all the patients having angina after operation. There are some situations in which the IMA may have inadequate flow in comparison to the vein graft. These results suggest the IMA is an excellent graft in most coronary bypass procedures.     

Aorta-to-Right Pulmonary Artery Anastomosis Causing Obstruction of the Right Pulmonary Artery: Management During Correction of Tetralogy of Fallot

Sixteen of 18 patients undergoing intracardiac repair of tetralogy of Fallot following ascending aorta-to-right pulmonary artery shunt procedures required patch reconstruction of the right pulmonary artery because of significant obstruction at the site of the shunt. Patch reconstruction was required in all patients having had shunts done at less than 1 year of age. The operative mortality in this group of patients was higher than that in patients undergoing repair of tetralogy alone or repair plus ligation of a prior Blalock-Taussig shunt, but it was lower than that associated with repair plus obliteration of a previous Potts anastomosis. The ascending aorta-to-right pulmonary artery shunt appears to be the best procedure for palliation of severely symptomatic infants with tetralogy in whom the anatomy is not suitable for either primary repair or a subclavian-to-pulmonary artery shunt. Cardiac catheterization and angiocardiography should be performed prior to subsequent total correction to demonstrate the direction of flow and the anatomical configuration of the right pulmonary artery.