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Biomedical subjects

G B Cintron

Publications and source records attributed to G B Cintron.

12 recordsLinked to original sources
PubMed2004

Heart failure in Parkinson's disease: analysis of the United States medicare current beneficiary survey.

OBJECTIVE: We sought to examine the prevalence of heart failure in elderly PD versus non-PD patients using a national sample of Medicare beneficiaries in the United States. SCOPE: The prevalence of heart failure in elderly PD patients was 2.27 times that of non-PD patients (19.4% versus 8.7%, 95% CI = 1.43-3.60, p 0.0005), and remained twice as high after excluding patients with stroke and possible vascular parkinsonism. CONCLUSIONS: In this cross-sectional study of a national Medicare database, heart failure occurred twice as frequently in elderly PD patients as in non-PD patients. Prospective studies are warranted to verify these findings.

Aged↗
PubMed1994

Normalization of circulating atrial natriuretic peptides in cardiac transplant recipients.

To assess whether heart transplantation (Htx) alters the marked elevation of circulating atrial natriuretic peptides usually found in patients with congestive heart failure (CHF), 14 subjects (nine with compensated and five with decompensated CHF), each with an ejection fraction < or = 28%, were evaluated. Immediately before and hourly for the first 12 hours after Htx, then daily for 21 days and every 1 to 4 weeks for 6 months, the circulating concentrations of the N-terminus (pro atrial natriuretic factor [ANF] 1-98), midportion of the N-terminus (pro ANF 31-67), and C-terminus (that is, ANF) of the 126 amino acid prohormone were measured. Increased (p < 0.001) levels of these peptides were found in superior vena cava, right atrial, and peripheral venous samples 1 hour after Htx in all subjects except one. The atrial natriuretic peptide levels correlated only with right atrial pressure (p < 0.01) in the first 24 hours. Circulating concentrations of these peptides returned to those of healthy adults between 5 and 12 days after Htx in 11 out of 14 Htx recipients. Thus successful Htx can restore the elevated circulating concentrations of atrial natriuretic peptides to those of healthy adults.

Adult↗
PubMed1993

Enalapril decreases prevalence of ventricular tachycardia in patients with chronic congestive heart failure. The V-HeFT II VA Cooperative Studies Group.

BACKGROUND: Patients with heart failure have a high prevalence of serious arrhythmias and sudden cardiac-death. METHODS AND RESULTS: Male patients aged 18-75 years with chronic heart failure were randomized to enalapril or hydralazine-isosorbide dinitrate. Short-term (4-hour to 8-hour) Holter tape recordings were performed before randomization, at 3 months, at 1 year, and yearly thereafter. Of 804 patients randomized to therapy, 715 had Holters at baseline. Couplets were noted in 56% versus 60% and ventricular tachycardia (VT) (three or more consecutive ventricular premature beats) in 27% versus 29% of patients randomized to enalapril versus hydralazine-isosorbide dinitrate, respectively. The presence of VT at 3 months, 1 year, and 2 years predicted significantly higher mortality during the subsequent year (p < 0.0001, p < 0.001, and p < 0.037, respectively). In the enalapril group, VT prevalence decreased by 27% at 1 year (p < 0.02). A decrease in prevalence of VT was not seen in the hydralazine-isosorbide dinitrate group. New VT was seen in 11% of enalapril patients versus 24% of hydralazine-isosorbide dinitrate patients at 1 year (p < 0.002). When compared with hydralazine-isosorbide dinitrate at 1 and 2 years, there was a 52% and 49% reduction, respectively, in sudden deaths in the enalapril group. Thus, at 1 and 2 years, the decrease in sudden deaths in the enalapril group coincided with the decrease in VT prevalence and the decrease in new VT emergence. CONCLUSIONS: In patients with heart failure, VT and couplets predict increased mortality. When compared with hydralazine-isosorbide dinitrate, enalapril decreases both the persistence of baseline VT at 3 months and the emergence of new VT at 1 and 2 years. The reduction in VT prevalence parallels a reduction in sudden death. The effect of enalapril on survival over hydralazine-isosorbide dinitrate may be related to its ability to reduce prevalence of ventricular arrhythmia.

Death, Sudden, Cardiac↗
PubMed1992

Effect of diuretic therapy on the electrocardiographic response to exercise.

For nearly 30 years clinicians have assumed that diuretic therapy, per se, even in the absence of clinical hypokalemia, can cause false-positive exercise ST-segment responses. The precept has stubbornly persisted in the literature and in the day-to-day interpretation of exercise tests in clinical settings. The assumption probably originated with very early studies of patients on diuretics, in which other causes of false-positive tests were not excluded. This study was undertaken to show that diuretic therapy alone is not sufficient to cause ST depression. Twenty healthy male volunteers, aged 18 to 35, with normal history and physical examinations, echocardiograms, electrocardiograms, serum electrolytes, renal function tests and exercise tests, took 50 mg of hydrochlorothiazide daily for four weeks. Exercise tests, serum electrolytes, and renal function tests were repeated at Weeks 2 and 4. The administration of the diuretic resulted in a statistically significant reduction in serum potassium (from 4.37 +/- 0.37 to 3.96 +/- 0.28, and 3.94 +/- 0.31 mEq/l at 2 and 4 weeks, respectively). There were no abnormal ST-segment shifts on any of the exercise tests. It is concluded that exercise-induced ST-segment shifts in otherwise healthy young male normokalemic subjects who are taking diuretics should not be ascribed to a false-positive response to diuretics.

Adolescent↗
PubMed1991

Spinal epidural hematoma causing cord compression after tissue plasminogen activator and heparin therapy.

Bleeding is the most serious complication of thrombolytic therapy and limits its usefulness. We have reported a case of epidural hematoma, a rare occurrence after combined therapy with tissue plasminogen activator (TPA) and heparin. We emphasize that in patients treated with thrombolytic agents, any trauma may increase the risk of bleeding. The sudden onset of back pain and neurologic deficits should alert the clinician to the possibility of spinal hematoma with cord compression.

Aged↗
PubMed1988

Effect of intravenous isosorbide dinitrate versus nitroglycerin on elevated pulmonary arterial wedge pressure during acute myocardial infarction.

To compare the acute and sustained effect of intravenous isosorbide dinitrate to intravenous nitroglycerin in patients with acute myocardial infarction and elevated pulmonary artery wedge pressure, 111 patients were randomized and studied within 96 hours of admission to the coronary care unit. All patients had a pulmonary artery wedge pressure greater than or equal to 10 mm Hg and received either isosorbide dinitrate (74 patients) or nitroglycerin (37 patients) for 24 to 48 hours. Blood pressure, heart rate, pulmonary artery wedge pressure, cardiac output, medication dose in micrograms per minute and retitration episodes were compared at baseline and at 6, 12, 18 and 24 hours. Both drugs significantly (p less than 0.05) lowered pulmonary artery wedge pressure and blood pressure and increased cardiac output. Isosorbide dinitrate required fewer retitration episodes and less increases in dosage than nitroglycerin at 24 hours. In the patient with acute myocardial infarction complicated by high pulmonary artery wedge pressure who requires intravenous nitrates for 24 hours, isosorbide dinitrate may offer the benefit of a more stable hemodynamic effect.

Aged↗
PubMed1988

Phantom angina.

Explore the source record for details and available documents.

Angina Pectoris↗
PubMed1981

Bedside recognition, incidence and clinical course of right ventricular infarction.

To evaluate the incidence, clinical characteristics and course of right ventricular infarction, 96 patients with an established diagnosis of acute myocardial infarction were evaluated during a 10 month study period. Of the 44 patients with acute inferior wall myocardial infarction, 16 had bedside evidence of right ventricular dysfunction. All had a positive Kussmaul's sign, and 12 had either a right ventricular third or fourth heart sound. Inspiratory elevation of right atrial and right ventricular end-diastolic pressures was documented in nine patients. Ventricular fibrillation developed in one patient and advanced atrioventricular block in three. All 16 patients survived and were alive 3 months after infarction. The hospital course and 3 month survival rate were not different from those of the usual patient with inferior wall infarction. Approximately one third of the patients with inferior wall myocardial infarction have bedside evidence of right ventricular infarction, which usually does not alter short-term prognosis.

Acute Disease↗
PubMed1977

Pericarditis mimicking tricuspid valvular disease.

A patient with rheumatoid disease initially had the physical findings of isolated tricuspid stenosis. Postmortem examination demonstrated adhesive pericarditis with localized hemopericardium which compressed the atrioventricular groove in the area of the tricuspid valve. Historical, physical, electrocardiographic, and cardiac catheterization features which suggested the diagnosis are discussed.

Arthritis, Rheumatoid↗
PubMedDate not supplied

Risk factors for late recurrent rejection after heart transplantation: a multiinstitutional, multivariable analysis. Cardiac Transplant Research Database Group.

BACKGROUND: Previous studies of allograft rejection have focused on early episodes and risk factors from pretransplant variables. METHODS: This multiinstitutional study compared early (< 1 year) and late (> 1 year) rejection episodes and risk factors for recurrent rejection from variables both before and after transplantation among 1251 patients who underwent primary heart transplantation and available follow-up of greater than 1 year. RESULTS: There were a total of 1882 rejection episodes over a mean follow-up of 26 +/- 0.3 months. The hazard function (instantaneous risk per patient per month) peaked at 1 month followed by a low constant risk of rejection after 12 months. By multivariable analysis, the most dominant risk factors for recurrent rejection during the first posttransplantation year were a shorter time interval since transplantation and a shorter time since a previous rejection episode. Other factors included young age, female gender, female donor, positive cytomegalovirus serology, prior infections, and OKT3 induction. In contrast, after the first year, the dominant risk factors for rejection were a greater number of rejections during the first year and the presence of prior cytomegalovirus infections. CONCLUSIONS: These data show a striking time dependency for rejection episodes among heart transplant recipients. Factors that increase risk for rejection in the first year differ from risk factors for rejection in subsequent years. These data suggest that it may be possible to tailor rejection surveillance protocols and immunosuppression intensity, according to specific patient and time-related risk factors.

Adolescent↗
PubMedDate not supplied

Pretransplantation risk factors for acute rejection after heart transplantation: a multiinstitutional study. The Transplant Cardiologists Research Database Group.

To better understand the phenomenon of acute rejection in the current era of heart transplantation, complete rejection data (918 rejection episodes) from 25 institutions were analyzed for all 911 patients undergoing primary heart transplantation between January 1, 1990, and July 1, 1991. During a mean follow-up of 8.1 months (maximum, 18 months), 54% of the patients had one or more rejection episodes. The mean cumulative number of rejection episodes per patient was 0.8 at 3 months, 1.10 at 6 months, and 1.3 at 12 months after transplantation. By univariate analysis, female donor hearts (irrespective of recipient sex) (p < 0.01) and the use of induction therapy (p < 0.01) were associated with greater cumulative rejection frequency. By multivariate analysis, younger donor age and female donor gender were risk factors for earlier rejection. Solution of the multivariate equation predicted an 85% probability of rejection at 1 month for a 5-year-old female with a female donor and 50% for a 50-year-old man with a male donor. Inferences: (1) In the current era, over 40% of patients appear to be free of rejection during the first year after transplantation. (2) Younger recipient age and female donors are associated with earlier onset of allograft rejection, but the precise immunologic basis for these observations remains unknown. (3) In this experience, induction therapy did not delay the onset of first rejection nor did it reduce the cumulative number of rejection episodes. Further studies are indicated to examine the need for induction therapy.

Actuarial Analysis↗