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Biomedical subjects

J M Aranda

Publications and source records attributed to J M Aranda.

At least 37 records · Page 2Linked to original sources

Nurse practitioner role in a chronic congestive heart failure clinic: in-hospital time, costs, and patient satisfaction.

The purpose of this study was to compare in-hospital time, medical costs, and patient satisfaction before and after the introduction of a nurse practitioner in a chronic heart failure clinic. The records of all patients who attended the NP chronic congestive heart failure clinic were reviewed. Questionnaires were mailed to all available patients to evaluate satisfaction. We compared the number of hospitalizations, inpatient hospital days, and total yearly cost, 1 year before and 1 year after the institution of the chronic congestive heart failure clinic. Fifteen patients were seen an average of every 3 weeks for 7 to 48 months for a mean follow-up period of 24 months. Ages ranged from 48 to 86 years, for a mean age of 65. All but three patients had class IV congestive heart failure. Twelve patients had coronary disease, two valvular heart disease and one congestive cardiomyopathy. Seven of the 15 patients died during the follow-up period, all but one of progressive congestive heart failure. The number of yearly hospitalizations per patient decreased from 2.8 to 0.7 and yearly hospitalized days per patient from 62 to 9 (p less than .01). Total yearly medical cost decreased $131,175. Patient satisfaction was unanimous. In-hospital time and yearly medical costs decreased markedly and patient satisfaction increased after institution of the NP chronic congestive heart failure clinic.

Aged↗

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↗

Hemodynamic response to isometric handgrip in acute myocardial infarction.

Thirteen patients underwent right cardiac catheterization during the first 24 hours after the onset of symptoms of acute myocardial infarction. All had normal (less than 12 mm Hg) pulmonary arterial diastolic pressure or normal mean pulmonary wedge pressure (7.6 +/- 0.6 mm Hg). The patients did isometric forearm contraction to a measured level of 100 mm Hg. All patients had elevation of systemic systolic blood pressure, with a mean rise of 14.2 +/- 2.9 mm Hg; heart rate rose by 12 +/- 2 beats per minute. When compared to a control group, patients with acute myocardial infarction had a significant (P less than 0.005) elevation of 5.4 +/- 1.3 mm Hg in the pulmonary arterial diastolic or pulmonary wedge pressure. This may be a result of either increased left ventricular stiffness or decreased myocardial functional reserve. In the setting of acute myocardial infarction, patients with normal left ventricular filling pressures have abnormal ventricular performance. Isometric effort is poorly tolerated and should be avoided.

Adult↗

Terminating ventricular fibrillation by chest thump.

A 41-year-old man with a surgically closed atrial septal defect presented with anginalike symptoms of 5 years duration. While undergoing coronary arteriorgraphy, the patient sustained ventricular fibrillation which was converted successfully to sinus rhythm by a chest thump. This is the first reported case of such conversion. The mechanism of mechanical conversion from ventricular tachycardia, or fibrillation, to sinus rhythm may be that the mechanical stimulus interrupts a re-entry pathway or depresses ectopic impulses to allow the normal sinoatrial rhythm to emerge.

Adult↗

Programmed simultaneous biventricular stimulation in man, with special reference to its use in the evaluation of intraventricular reentry.

Programmed stimulation was alternatively performed exclusively from the right ventricular endocardium, exclusively from the left ventricular epicardium and simultaneously from both ventricles in 8 patients who did not have coronary artery disease or bundle branch block. A specially constructed QRS triggered pacemaker, (with a refractory period of 260 msec and an escape interval of 800 msec) connected to the right ventricular and left ventricular electrodes, was used to perform simultaneous biventricular stimulation. The latter had no untoward effects and was not more dangerous than exclusive right ventricular, or exclusive left ventricular, stimulation. In 3 patients, pacemaker-induced repetitive firing occurred during right and left ventricular pacing. Persistence of this phenomenon (in these 3 patients) during simultaneous biventricular stimulation is in keeping either with a microreentry occurring in the vicinity of the electrodes or with a macroreentry involving the bundle branches. A more precise evaluation of the reentry circuit requires that left ventricular pacing be performed from an endocardial (rather than from an epicardial) site. This study suggests that the pulse generator described in the present communication can be used to produce simultaneous atrial and ventricular activation (or pacing) by connecting one pole to an atrial electrode and the other pole to a ventricular electrode. This modality of stimulation can be effective in preventing or abolishing some types of reciprocating atrioventricular tachycardias.

Aged↗

Functional significance of electrocardiographic changes after left ventricular aneurysmectomy.

Electrocardiographic (ECG) changes after left ventricular aneurysmectomy were analyzed in 20 patients, thirteen of whom had additional aorto coronary saphenous vein bypass surgery. ECG changes were correlated with postoperative clinical and hemodynamic results. Out of 14 patients (Group I) who showed hemodynamic and/or clinical improvement, eight had decrease of chronic ST segment elevation that was associated in five with loss of pathologic Q waves. In the remaining six patients (Group II) who showed no hemodynamic or clinical improvement as well as in six patients in Group I, chronic ST segment elevation persisted or increased and in some, new pathologic Q waves developed after surgery. The study suggests that loss of pathologic Q waves and/or decrease of chronic ST segment elevation in patients who undergo a left ventricular aneurysmectomy with aorto coronary saphenous vein bypass surgery may reflect postoperative clinical, hemodynamic and angiographic improvement. On the other hand, failure of these ECG changes to occur or, conversely, increased ST segment elevation and/or appearance of new Q waves may have no predictive value. The mechanisms for these ECG changes are discussed.

Adult↗