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Biomedical subjects

D M Rose

Publications and source records attributed to D M Rose.

At least 73 records · Page 4Linked to original sources
PubMed1988

Coronary artery bypass in septuagenarians. Analysis of mortality and morbidity.

Elective coronary artery bypass surgery can be performed with an expected operative mortality of 1-3%. However, the effects of age on morbidity and mortality in patients undergoing this procedure remain controversial. To analyze morbidity and mortality in septuagenarians undergoing isolated coronary artery bypass surgery, we compared the results in 685 septuagenarians with those in 3,142 patients under the age of 70 years, all of whom underwent this procedure from January 1981 to December 1986. A larger percentage of elderly patients had triple-vessel disease (89% vs. 71%), left main coronary artery obstruction (34% vs. 16%), and ejection fractions less than 45% (68% vs. 41%). A larger percentage of septuagenarians had perioperative myocardial infarction (8% vs. 2%), required prolonged ventilatory support (10% vs. 3%), and had major neurological complications (4% vs. 1%). Mortality rates were significantly higher in elderly patients (7% vs. 2%) but did not correlate with the severity of coronary artery disease, the anginal pattern, or the diminishment of ventricular function. Major causes of mortality were pulmonary failure, renal failure, or both, sepsis, and neurological complications. These data suggest that elderly patients have an increased risk of cardiac and noncardiac morbidity and mortality after coronary artery bypass surgery. Higher mortality rates in this age group appear attributable to noncardiac organ failure. Late follow-up studies failed to show any significant difference among patients based on age alone.

Aged↗
PubMed1987

Reperfusion ventricular fibrillation during coronary artery bypass operations and its association with postoperative enzyme release.

Elevated creatine kinase MB level is the most common marker of myocardial infarction in patients who have had a recent coronary bypass operation. This study was performed to determine whether there is any relationship between reperfusion rhythms, their treatment, and postoperative creatine kinase MB concentrations. Twenty patients were monitored during coronary bypass operations. Four patients had no reperfusion ventricular fibrillation and no elevation of creatine kinase MB postoperatively. Of the 16 remaining patients, all had ventricular fibrillation and 12 had an elevation of postoperative creatine kinase MB (p less than 0.015). There was also a 75% correlation between the time in ventricular fibrillation and postoperative creatine kinase MB level. There was no correlation between other measured parameters, such as cross-clamp time, bypass time, or the number of defibrillations. It is concluded that reperfusion ventricular fibrillation is associated with release of creatine kinase MB, and the time in ventricular fibrillation is correlated with the postoperative creatine kinase MB level.

Aged↗
PubMed1987

Anesthetic and supportive management during experimental pulsatile flow perfusion studies in calves.

The purpose of this study was to determine the factors influencing successful experimental cardiopulmonary bypass studies using pulsatile flow perfusion and the medications and methodology necessary to produce successful bypass in calves. In six calves showing no cardiopulmonary pathology prior to bypass procedures, successful anesthesia and surgical intervention was accomplished. Animals were maintained on 5 hours of pulsatile flow bypass perfusion. Successful recovery from the procedures was accomplished. In two calves with pre-existing pulmonary pathology, anesthetic and surgical intervention was accomplished with the utilization of extensive anesthetic management and cardiac supportive medications until the animals could be initiated into 5 hours of pulsatile flow bypass perfusion, in spite of major pulmonary dysfunction. In these two animals, attempts to resuscitate upon termination of pulsatile flow perfusion were unsuccessful due to pre-existing excessive lesions in the lungs. This study shows a contrast between complete success of a pulsatile flow system in normal subjects versus the ultimate failure in experimental animals with pre-existing pulmonary pathology. The inability of experimental calves with a diseased lung to resume spontaneous cardiopulmonary function after the challenges of thoracic intervention indicates the unsuitability of animals with marked pre-existing pulmonary disease status for use in cardiopulmonary bypass studies.

Anesthesia, General↗
PubMed1987

Results of open heart surgery in patients with recent cardiogenic embolic stroke and central nervous system dysfunction.

Patients undergoing open heart surgery who have had recent cardiogenic embolic stroke or have central nervous system dysfunction pose a difficult management problem. There is always the risk that cardiopulmonary bypass and heparinization may exacerbate the neurologic injury. There is no clear data indicating what is a safe interval of time from the onset of neurologic symptoms to the time of surgery. Since 1982 we have operated on 15 patients with recent (2 to 28 days, mean 12.7 +/- 7.9 days) neurologic injury. Indications for surgery included recurrent embolization, sepsis, and hemodynamic deterioration. Three patients were comatose with no focal neurologic signs at the time of surgery, and 12 patients had focal neurologic deficits. All patients had preoperative computed tomographic scans. Embolic cerebral infarctions were documented in 12 patients, one patient had evidence of intracranial hemorrhage, and one patient had a subdural hematoma. Fourteen patients had native or prosthetic valvular endocarditis and one patient had a left atrial myxoma. All patients underwent corrective cardiac surgery. One patient died in the postoperative period from multisystem failure; all other patients have been followed since discharge (6 months to 4 years). All surviving patients demonstrated improvement in their neurologic symptoms and eight patients had complete neurologic recovery. The results of this study indicate that open heart surgery can be safely performed in patients with recent neurologic injury.

Adolescent↗
PubMed1986

Cryopreserved homologous saphenous vein: early and late patency in coronary artery bypass surgical procedures.

Autologous saphenous vein has proved to be a satisfactory conduit for use in coronary artery bypass grafting. Unfortunately, it is not always available, and substitute material must sometimes be used. When satisfactory autologous veins were not available and the internal mammary arteries were unsuitable, cryopreserved homologous saphenous veins were used in 28 patients. A total of 76 grafts were constructed. Cryopreserved homologous veins were used for 61 grafts, autologous saphenous veins for 11 grafts, and the internal mammary artery for 2 grafts. Coronary angiography was performed 8 to 12 days postoperatively in 16 patients. Of the 31 homografts studied, 8 were occluded (26%), 3 were stenotic (9%), and 20 were normal (65%). The one internal mammary artery and six autologous veins studied were all patent. Six patients underwent late catheterization 6 to 12 months postoperatively. Thirteen homografts were studied at late catheterization: 11 were occluded, 1 was severely stenotic, and 1 was mildly stenotic. At late catheterization, the one internal mammary artery studied was patent, and the one autologous saphenous vein was 95% occluded. Results of both early and late catheterization performed on 18 patients demonstrated that of the 35 homografts studied, 17 (49%) were occluded, 3 (9%) had greater than 70% stenosis, 1 (3%) had mild disease, and 14 (40%) were free of disease. One year follow-up data obtained on 26 patients revealed that 4 patients (15%) died of cardiac causes, 2 patients (8%) died of noncardiac causes, 11 patients (42%) have recurrent angina, and 9 (35%) are asymptomatic. It is concluded that use of cryopreserved homologous saphenous veins for coronary artery bypass grafting should be avoided if at all possible.

Adult↗
PubMed1986

Clinical tests for carpal tunnel syndrome: an evaluation.

Five clinical tests in common use for diagnosis of carpal tunnel syndromes have been shown to have little diagnostic value, either individually or in various combinations. No physical sign is useful in the diagnosis of this condition, which should be suspected on the basis of presenting symptoms and confirmed by electrodiagnosis using standard median nerve conduction tests.

Carpal Tunnel Syndrome↗
PubMed1986

Postoperative ST-segment elevation in coronary artery bypass surgery.

Using Holter monitors, 50 patients were monitored for vasospasm following coronary artery bypass surgery. Transient 2 mm ST-segment elevation was considered to be diagnostic or coronary vasospasm. Four patients (8 percent) had evidence of coronary vasospasm. Over 30 variables, including preoperative demographic information and medication, intraoperative technique, and postoperative medication, were subjected to multiple stepwise regression analysis. This analysis failed to show any association between preoperative prophylaxis with either nifedipine or nitrates (or other variables) and the postoperative development of coronary vasospasm. We conclude that the incidence of coronary vasospasm is more common than previously thought, and that a nifedipine or nitrate withdrawal, in this study, was not associated with an increased incidence of postoperative coronary vasospasm.

Aged↗
PubMed1986

Acute spinal cord ischemia: prevention of paraplegia with verapamil.

Although irreversible damage to the central nervous system has been considered inevitable after 6 min of circulatory deprivation, there has been evidence for almost 20 years that this may be the consequence of postischemic events. Recent investigations have implicated calcium-mediated phenomena as responsible for damage to neuronal cells in the reperfusion period. We studied the effect of verapamil on the neurologic sequelae of spinal cord ischemia using somatosensory evoked potential monitoring in a canine preparation of spinal cord ischemia. Ten mongrel dogs weighing between 20 and 30 kg each were divided into two groups. The experimental group was pretreated with 0.4 mg/kg verapamil and the control group received no treatment. The thoracic aorta was then occluded. Flow was restored 17 min after there was complete loss of somatosensory evoked potentials. Experimental dogs received additional doses of verapamil upon reperfusion and at 1, 2, 3, 4, 5, 6, and 10 hr after reperfusion. Four of five verapamil-treated dogs were able to walk postoperatively, whereas all of the control dogs suffered dense paraplegias (p = .02). We conclude that verapamil can ameliorate the sequelae of spinal cord ischemia and that this preparation is suitable for the study of the mechanisms of ischemic neuronal damage in an area outside the brain.

Animals↗
PubMed1986

Strategy for treatment of acute evolving myocardial infarction with pulsatile left heart assist device. Can this modality increase survival and enhance myocardial salvage?

This article describes the technique of left heart bypass in the treatment of both experimental and clinical acute myocardial infarction. A new technique of closed-chest percutaneous left heart bypass that can be used in patients with acute evolving myocardial infarction and cardiogenic shock is also described.

Acute Disease↗
PubMed1986

Surgical results for mitral regurgitation from coronary artery disease.

Results of coronary artery bypass grafting with and without mitral valve replacement were analyzed retrospectively in 101 patients with preoperative ischemic mitral regurgitation to determine the effects of severity and surgical treatment of mitral regurgitation on survival. Between 1980 and 1984, a total of 1,475 patients (mean age 59, 77% male) underwent coronary bypass. These patients were divided into three groups: (1) patients without ischemic mitral regurgitation who underwent isolated coronary bypass (1,374; 93%), (2) patients with ischemic mitral regurgitation who underwent isolated coronary bypass without valve replacement (85; 6%), and (3) patients with ischemic mitral regurgitation who underwent combined mitral valve replacement and coronary bypass (16; 1%). Preoperatively, patients with ischemic mitral regurgitation compared to those without regurgitation were significantly older (+6 years, p less than 0.001), had more severe coronary artery disease (p less than 0.001), a higher incidence of congestive heart failure (24% versus 5%, p less than 0.001) and recent myocardial infarction (16% versus 8%, p less than 0.01), and a lower mean ejection fraction (45% versus 61%, p less than 0.001). Operative mortality was significantly increased in patients with ischemic mitral regurgitation who underwent coronary bypass alone (p less than 0.01) and in those who underwent coronary bypass and mitral valve replacement (p less than 0.01)--11% and 19%, respectively--than in the coronary bypass patients without ischemic mitral regurgitation (3.7%). The severity of mitral regurgitation (0 to 4+) proved to be the most significant predictor of operative mortality. The actuarial survival rate at 5 years for the coronary bypass patients without ischemic mitral regurgitation was 85% compared to 91% (p less than 0.05) for the coronary bypass patients without ischemic mitral regurgitation. These results indicate that patients with ischemic mitral regurgitation have a higher prevalence of cardiac risk factors and are at an increased risk of operative mortality. Although the severity of the ischemic mitral regurgitation was strongly predictive of early survival, it proved to have an unexpectedly modest effect on long-term survival after surgical treatment.

Actuarial Analysis↗
PubMed1986

Efficacy of right ventricular unloading during right coronary artery occlusion in an experimental model.

This investigation examined the efficacy of right atrial-pulmonary artery bypass (RA-PA) during acute ischemia of the right ventricle. The right coronary artery (RCA) was ligated in 25 open chest, open pericardium sheep. Control animals (n = 15) were resuscitated with only intravenous fluids. In the experimental animals (n = 10) RA-PA bypass was initiated 5 minutes after right coronary occlusion. Sixty percent (9/15) of the control animals died within 90 minutes of RCA occlusion from refractory ventricular arrhythmia or right ventricular failure. Four of 10 RA-PA animals died within 2 hours of RCA occlusion from severe pulmonary hemorrhage and arterial oxygen desaturation when high flow rates (2.5 to 3.5 L/min) were initially instituted. In these animals, lung histologic findings demonstrated extensive hemorrhage into the alveolar spaces. After 6 hours of RCA occlusion in the six surviving control animals, there were significant increases in central venous pressure and right ventricular end-diastolic cord length (relative ventricular volume change measured by ultrasonic crystal analysis), and a significant decrease in the cardiac output. In contrast, during RCA occlusion in the six surviving animals on RA-PA bypass, cardiac output was well maintained, and there was a significant decrease in central venous pressure and end-diastolic length. The percent of change from baseline in end-diastolic length correlated inversely with the percent of change from baseline in cardiac output (r = -0.81, p less than 0.01). By crystal violet and triphenyltetrazolium chloride dye techniques, the mean percentage area of necrosis to area of risk was significantly less for the RA-PA group compared with the control group (5.6% versus 67.1%, p less than 0.0001). In this experimental model, RA-PA bypass effectively unloaded the acutely ischemic right ventricle, maintained systemic cardiac output, and significantly reduced right ventricular infarction size. Further investigations with this ventricular support modality are needed to determine its effects on pulmonary pathophysiology.

Animals↗
PubMed1986

Selective surgical management of perforated duodenal ulcer.

In an effort to clarify the preoperative indications and factors predisposing to an increased operative morbidity for "definitive" ulcer procedures, the medical records of 114 patients with perforated duodenal ulcers were reviewed. One hundred nine patients underwent operation, with 55 patients treated with ulcer closure (Group 1) and 54 underwent a "definitive" operation (Group 2). Thirty-two complications developed in 27 patients (25%), with major infectious complications occurring in 9 per cent and 7.5 percent in the simple ulcer closure and definitive surgery groups, respectively. This study demonstrates that preoperative shock, operation delayed greater than 48 hours, and patient age greater than 60 years were significant factors increasing morbidity. The importance of peritoneal soilage and positive cultures are unreliable in predicting subsequent clinical infection and do not contraindicate definitive surgical management.

Adolescent↗
PubMed1985

Analysis of morbidity and mortality in patients 70 years of age and over undergoing isolated coronary artery bypass surgery.

With increasing frequency more elderly patients are referred for coronary artery bypass surgery. The operative results of 201 patients 70 years of age and over were compared with the results of 1242 patients under 70 years operated on since 1981. A larger percentage of the elderly patients had triple-vessel disease (66.2% vs 51.0%, p less than 0.001), left main coronary artery obstruction (34.8% vs 16.3%, p less than 0.01), and an ejection fraction of less than or equal to 45% (30.8% vs 21.1%, p less than 0.001). An increase percentage of the patients 70 years of age and over had perioperative myocardial infarction (7.9% vs 4.1%, p less than 0.05), required prolonged ventilatory support (7.9% vs 3.1%, NS), and had major neurologic complications (4.0% vs 1.1%, p less than 0.001). The mortality rate was significantly higher in the elderly patients (5.9% vs 1.9%, p less than 0.01) but did not correlate with degree of coronary artery disease, anginal pattern, or preoperative ventricular function. Only 2 of 12 deaths in the elderly patients were from cardiac causes. This data would suggest that elderly patients have an increased risk for significant cardiac and noncardiac morbidity and mortality following coronary artery bypass surgery and that the higher mortality rate in this age group may be a result of noncardiac organ failure.

Age Factors↗
PubMed1985

Efficacy of percutaneous transluminal coronary angioplasty compared with single-vessel bypass.

The use of percutaneous transluminal coronary angioplasty has been increasing rapidly. When the procedure is successful, the clinical relief of symptoms is similar to that achieved with direct coronary artery bypass. It has been suggested that the angioplasty procedure, however, can accomplish these results with potentially less morbidity and mortality, along with a shorter hospital stay. In order to evaluate the results of percutaneous transluminal coronary angioplasty with single-vessel coronary artery bypass, we performed a retrospective review. From January, 1982, to December, 1983, a total of 198 angioplasty procedures were performed. They were successful in 142 patients (71.7%). Emergency bypass was performed in 21 (10.6%) of the 56 patients who had undergone unsuccessful angioplasty procedures. Perioperative myocardial infarction occurred in eight of these patients (38.1%). There were no operative deaths, but there was one death after angioplasty. Elective bypass was performed in 28 of the patients who had angioplasty procedures, with no perioperative myocardial infarctions or operative deaths. Recurrent symptoms developed in 31 (21.8%) of the 142 patients who had undergone initially successful angioplasty. From 1982 to 1983, single-vessel bypass was performed in 143 patients. The internal mammary artery was utilized in 102 patients and the autogenous saphenous vein in 41 patients. There were no perioperative myocardial infarctions or deaths. No patients developed recurrent symptoms during the study interval. Percutaneous transluminal coronary angioplasty is an acceptable alternative to coronary artery bypass in patients with localized lesions that are sufficiently serious to cause symptoms and warrant surgical bypass. However, the angioplasty procedure, when compared to single-vessel coronary artery bypass, may result in an increased incidence of acute myocardial infarction and in a significantly (p less than 0.001) increased incidence of early recurrence of symptoms.

Adult↗
PubMed1984

Surgical therapy of a dissecting aortic aneurysm involving a right-sided aortic arch.

Dissecting aortic aneurysm involving a right-sided aortic arch is apparently quite rare. A patient with this unusual entity is described. By performing an extraanatomic bypass, the aneurysm was excluded between stainless steel staples. The patient was discharged from the hospital 21 days postoperatively. Although the reasons for the extreme rarity of this entity are not clear, precise anatomic definition is required for successful surgical therapy.

Aortic Dissection↗
PubMed1984

Patterns of severe pancreatic injury following cardiopulmonary bypass.

Severe pancreatic complications following cardiac surgery are rare, but 14 patients with severe pancreatitis have been encountered since 1971. Six of these developed acute fulminating pancreatitis following cardiac surgery and each of these died within 21 days following operation. Seven patients had less severe pancreatitis, resulting in pancreatic abscess formation and five in this group expired. One patient developed a pancreatic pseudocyst following mild acute pancreatitis and expired 4 months later. Although the etiologic mechanisms are unclear, possible factors include: prolonged cardiopulmonary bypass, "the low cardiac output syndrome," and inadequately treated or unrecognized postoperative pancreatitis. The diagnosis is based on physical examination, upper gastrointestinal series, and the abdominal CT scan. Despite aggressive surgical therapy, pancreatitis following cardiopulmonary bypass is an extremely serious condition.

Abscess↗