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I A Regragui

Publications and source records attributed to I A Regragui.

9 recordsLinked to original sources
PubMed1996

Effects of cardiopulmonary bypass temperature on pulmonary gas exchange after coronary artery operations.

BACKGROUND: Pulmonary dysfunction is one aspect of the postoperative morbidity associated with cardiopulmonary bypass. Normothermic systemic perfusion can result in shorter intubation times, which have been attributed to improved pulmonary gas exchange, but the influence of perfusion temperature on pulmonary gas exchange itself is not known. METHODS: Pulmonary gas exchange was assessed using alveolar-arterial oxygen pressure gradients in 45 patients undergoing routine coronary revascularization who were randomized to undergo cardiopulmonary bypass at 28 degrees C, 32 degrees C, or 37 degrees C. This was part of a more comprehensive study of the effects of temperature on bodily systems. The gradients were estimated preoperatively with the patients breathing air, again over a period between 2 and 4 hours postoperatively during mechanical ventilation with three different oxygen concentrations (30%, 40%, and 60%), and again 1 hour after extubation while breathing the same three oxygen concentrations. RESULTS: Preoperative alveolar-arterial oxygen pressure gradients on air were 24.4 +/- 8.2 mm Hg (mean +/- standard deviation) (28 degrees C), 24.5 +/- 20.4 mm Hg (32 degrees C), and 20.5 +/- 9.5 mm Hg (37 degrees C). Postoperatively, during ventilation and after rewarming, the gradients increased with the increase in inspired oxygen fraction concentrations (30% to 60%) from 67.1 +/- 12.0 mm Hg to 193.1 +/- 30.5 mm Hg (28 degrees C), from 76.4 +/- 20.6 mm Hg to 246.7 +/- 47.7 mm Hg (32 degrees C), and from 79.0 +/- 18.0 mm Hg to 222.9 +/- 40.5 mm Hg (37 degrees C), respectively. A similar pattern was noted 1 hour after extubation, when the gradients increased from 72.4 +/- 12.5 mm Hg to 256.6 +/- 26.5 mm Hg (28 degrees C), from 75.7 +/- 13.9 mm Hg to 252.7 +/- 38.3 mm Hg (32 degrees C), and from 69.1 +/- 19.3 mm Hg to 253.1 +/- 33.0 mm Hg (37 degrees C). There were no significant differences in alveolar-arterial oxygen pressure gradient between the three groups during ventilation or after extubation. CONCLUSIONS: Cardiopulmonary bypass perfusion temperature does not influence alveolar-arterial oxygen pressure gradients in the first 12 hours after routine coronary artery bypass grafting in patients with uncompromised pulmonary and left ventricular function.

Carbon Dioxide↗
PubMed1995

Mitral valve replacement after previous right pneumonectomy.

Adequate exposure of the mitral valve is essential to the safe and effective performance of valve replacement. We describe a successful mitral valve replacement performed in a patient who had undergone a right pneumonectomy. After a median sternotomy was made, the mitral valve was approached through an incision in the left atrial appendage that extended to the origin of the left superior pulmonary vein. The operation was uncomplicated, and the patient made an uneventful recovery.

Aged↗
PubMed1995

Cardiopulmonary bypass perfusion temperature does not influence perioperative renal function.

BACKGROUND: The recent introduction of normothermic cardiopulmonary bypass (CPB) perfusion has raised concerns regarding the associated risk of renal dysfunction through its potential to exacerbate the systemic inflammatory response and end-organ injury. This study was designed to investigate the influence of CPB perfusion temperature on renal function. METHODS: A prospective, randomized, controlled trial of CPB perfusion temperature (28 degrees C, 32 degrees C, and 37 degrees C) was performed in 30 patients undergoing routine coronary artery bypass grafting with normal preoperative renal function. Creatinine clearance was measured before induction of anesthesia, during CPB, and during every 12-hour period thereafter for 48 hours postoperatively. Glomerular and tubular function were assessed further by measurement of urinary creatinine, albumin, total protein, and retinol binding protein levels preoperatively, during CPB, and on days 1 and 3 postoperatively. RESULTS: Creatinine clearance increased on CPB by 51% (28 degrees C), 185% (32 degrees C), and 112% (37 degrees C) (all p < 0.01 versus preoperative values) and returned to preoperative values by 24 hours postoperatively in all three groups. Urinary albumin/creatinine ratios rose significantly from a mean of 0.4 +/- 0.1 (standard deviation) to 10 +/- 12.5 (28 degrees C), from 0.55 +/- 0.3 to 5.2 +/- 4.9 (32 degrees C), and from 0.96 +/- 0.8 to 7.8 +/- 7.0 (37 degrees C) during CPB (all p < 0.001) but decreased gradually thereafter. Also, urinary total protein/creatinine ratios rose significantly from a mean of 0.009 +/- 0.007 to 0.034 +/- 0.02 (28 degrees C), from 0.01 +/- 0.006 to 0.026 +/- 0.01 (32 degrees C), and from 0.011 +/- 0.008 to 0.033 +/- 0.02 (37 degrees C) during CPB (all p < 0.005); however, there was a further increase by 24 hours, and ratios decreased gradually thereafter. Similarly, urinary retinol binding protein/creatinine ratios rose significantly in all three groups during CPB (all p < 0.0001) and increased further by 24 hours. There was no statistically significant difference between the renal markers in the three temperature groups in any of the observations. CONCLUSION: These data suggest that cardiopulmonary bypass perfusion temperature does not influence renal function in patients undergoing coronary artery bypass grafting.

Aged↗
PubMed1995

Aprotinin use with hypothermic circulatory arrest for aortic valve and thoracic aortic surgery: renal function and early survival.

BACKGROUND AND AIM OF STUDY: Aprotinin is widely used during high risk cardiac surgery to reduce blood loss. Concern has been expressed about the safety of aprotinin in association with hypothermic circulatory arrest for surgery of the thoracic aorta and aortic valve. METHODS: A consecutive series of 19 patients undergoing surgery of the ascending aorta and/or the aortic arch using hypothermic circulatory arrest (15 - 20 degrees C) in conjunction with the use of aprotinin were studied prospectively from January 1993 to October 1994. The indications for operation were aortic dissection (n = 15) (11 acute) or annuloaortic ectasia (n = 4); 11 were emergency procedures. Ten patients underwent aortic valve replacement as part of a composite aortic root replacement and in seven patients aortic valve resuspension was possible. RESULTS: Mean total chest tube drainage was 878 +/- 548 ml (range 300 - 2,000 ml) with a mean usage of homologous blood of 2,328 +/- 1,600 ml. All but one patient survived (mortality 5.3%). None of the survivors experienced any adverse cardiac or neurological events. Serum creatinine rose significantly from a mean of 102 +/- 17 micromol/L preoperatively, to a mean of 172 +/- 100 micromol/L postoperatively (p<0.05), however, none of the patients became anuric or required dialysis and all values returned to preoperative levels by six weeks after surgery. Median intensive care stay was two days (range 1 - 20 days) and the median postoperative hospital stay was 11 days (range 6 - 50 days). CONCLUSION: These data suggest that aprotinin in conjunction with hypothermic circulatory arrest for surgery of the thoracic aorta and aortic valve has no adverse effect on early survival. However, significant though transient postoperative renal dysfunction was commonly observed in our experience.

Adult↗
PubMed1994

Transesophageal echocardiographic measurements of cardiac output in cardiac surgical patients.

Transesophageal echocardiography is becoming increasingly popular as a method of intraoperative monitoring because it can be performed continuously, does not transgress the sterile operative field, and provides data with regard to valve function, ventricular volumes, and contractility. Recently it was suggested that it can be used to measure cardiac output; however, controversy remains regarding its accuracy. Cardiac output was measured simultaneously by transesophageal echocardiography (using a 5-MHz pulse-wave Doppler, single-plane viewing probe) and by the thermodilution method in 21 patients undergoing open heart operations. The cardiac outputs measured by thermodilution correlated poorly (r = 0.45) with the transesophageal values derived from the left ventricular cross-sectional area, and the mean difference was 0.47 +/- 2.17 (standard deviation) L.min-1, giving limits of agreement of from -3.87 to +4.81 L.min-1. Cardiac outputs measured by thermodilution correlated well (r = 0.95) with transesophageal Doppler values derived from pulmonary artery flow velocity, with a mean difference of 0.12 +/- 0.45 L.min-1 and narrow limits of agreement of from -0.78 to +1.02 L.min-1. Based on our findings, transesophageal Doppler echocardiographic determination of cardiac output using pulmonary artery flow measurements can provide accurate hemodynamic data in patients undergoing cardiac operations.

Aged↗