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Biomedical subjects

J M Ramírez Isunza

Publications and source records attributed to J M Ramírez Isunza.

8 recordsLinked to original sources
PubMedDate not supplied

[Electroechocardiography correlation in the diagnosis of left ventricular hypertrophy in patients with systemic arterial hypertension].

To evaluate the surface (12 derivations) electrocardiogram in its possibility to predict left ventricular hypertrophy, the diastolic thickness of the posterior wall of the left ventricle was determined by M mode echocardiography in 12 normal persons and 47 hypertensive patients. In all cases the echocardiographic findings concerning diastolic thickness of the free wall of the left ventricle were studied as well as their relation ship to several electrocardiographic criteria mentioned in literature as indicative of left ventricle hypertrophy. The sensitivity, specificity and precision were calculated for each EKG criterion. The electrocardiographic criteria in general are little sensitive, highly specific and very variable in its accuracy. The most sensitive criteria found as indicative of left ventricle hypertrophy were the T positive wave in V1 higher than the T in V6 and the intrinsecoid deflection time inscription higher than 0.04 sec.

Cardiomegaly↗
PubMedDate not supplied

[Charges disease in the state of Aguascalientes. Isolation of a new strain of Trypanosoma cruzi in the state of Aguascalientes. (I)].

In 1974, two adult specimens of triatoma were obtained in the municipality of Calvillo, Aguascalientes. Tripomastigotes were found by studying their excreta in the microscope. Since no reports of naturally infected triatoma were reported from Aguascalientes, we decided to further study this finding. Additional triatoma specimens were collected from this municipality and their excreta was infected to albino mice. Twenty one days later the animals had parasitemia and with tripomastigotes, some of them died. The survivors were sacrificed and their heart was obtained for histological sections all of them had nests of amastigotes. Cultures were performed from the blood of infected animals employing as a nest NNN (Novy, Mc Neal, Nicolle), and epimastigotes and tripomastigotes grew. The lesions found in the histological study, the evolutive forms of the parasite in the transmitting insect and the host, strongly suggest the presence of trypanosoma cruzi.

Animals↗
PubMedDate not supplied

[Late perforation of the right ventricle by displacement of pacemaker electrodes (report of 2 cases)].

We report two cases of late perforation of the right ventricle due to arrow head endocardial electrodes, used for pacemaker stimulation in patients with complete atrio-ventricular block. Comments on the treatment of this complication are made. In one case the electrode was removed and the myocardium sutured. In the second case the distal part of the electrode was left in the pericardial cavity. In both cases epicardial electrodes were placed to continue the stimulation changing the site of implantation of the power source.

Aged↗
PubMedDate not supplied

[The response of ventricular tachycardia to adenosine administration].

Ten patients with ventricular tachycardia were studied. Two groups were formed. Group A included 5 patients with idiopathic ventricular tachycardia and group B included 5 patients with coronary heart disease. In all patients an electrophysiologic study was performed and monomorphic sustained ventricular tachycardia was induced through programmed stimulation. All patients received 12 mg of intravenous adenosine. The response was satisfactory in 3 of 5 patients in group A, with the presence of sinus rhythm. No response was seen in the other 2 patients. None of the patients in group B responded to the administration of intravenous adenosine. We concluded that adenosine may be useful in patients with cyclic AMP-mediated triggered activity ventricular tachycardia, in contrast to the coronary heart disease patients in which the mechanism is reentry. This interpretation is supported by results obtained in 15 experiments in canine heart.

Adenosine↗