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Biomedical subjects

R Betzu

Publications and source records attributed to R Betzu.

17 recordsLinked to original sources
PubMed1992

Diagnosis of atrial septal aneurysm by two-dimensional echocardiography--a case report.

A patient who was evaluated for a syncopal episode was found by two-dimensional (2D) echocardiography to have an aneurysm of the atrial septum. The atrial septal aneurysm appeared as a localized outpouching of the atrial septum that protruded into the left atrium during systole and into the right atrium during early diastole. The 2D echocardiography permits the definitive diagnosis of this condition by a noninvasive technique.

Diagnosis, Differential↗
PubMed1992

Is the morphology of ventricular premature beats a marker for left ventricular dysfunction?

The morphology of ventricular premature beats has been described as a marker for the presence or absence of myocardial disease. Furthermore, the premature beat has been reported to be a potential marker for a dilated and hypokinetic left ventricle. To verify this previously tested hypothesis, 37 healthy patients with ventricular premature beats on an electrocardiogram (ECG), Holter monitor ECG, or a stress test ECG were classified according to the ventricular premature beat morphology. Group 1 had ventricular premature beat QRS complexes with a smooth contour or with narrow (less than 40 msec) notching. Group 2 had ventricular premature beats with broad (greater than 40 msec) notching or shelves. All of these patients had normal or borderline normal ECGs and normal multiple-gated acquisition (MUGA) scans. Nine patients had type 1 ventricular premature beats, 20 patients had type II ventricular premature beats, and eight patients had both type I and type II ventricular premature beats. We conclude that the presence of group 2 ventricular premature beats is so frequent in patients with normal left ventricular ejection fractions that the use of this marker in identifying abnormal left ventricular function is suspect.

Adult↗
PubMed1991

Giant left atrium--a case report.

A seventy-seven-year old woman, with mitral stenosis, presented with cardiomegaly evident on her chest roentgenogram. The cardiac enlargement was due to a giant left atrium that distorted the cardiac structures. An echocardiogram and a first-pass nuclear angiogram were able to delineate the huge left atrium.

Aged↗
PubMed1990

Magnesium treatment of torsade de pointes--a case report.

An eighty-one-year-old woman received quinidine in order to convert atrial fibrillation to a sinus rhythm. The patient developed a prolonged QT interval on the EKG, as well as episodes of torsade de pointes. With the administration of intravenous magnesium sulfate, the abnormal rhythm was suppressed within minutes. Thus, magnesium should be the first drug used in patients with torsade de pointes and prolonged QT interval on the electrocardiogram.

Aged↗
PubMed1989

Effects of two cocktails on left ventricular diastolic function in normal men.

The effects of alcohol on diastolic function in normal males are unknown. Therefore, 12 male physicians had a Doppler echocardiogram performed in order to assess left ventricular diastolic performance. They then drank 4 ounces of whiskey, and forty-five minutes later a repeat Doppler echocardiogram was obtained. All the Doppler indexes of diastolic performance differed significantly after the ingestion of alcohol. The mean control D-F interval was 203 +/- 26 ms and after alcohol it was 237 +/- 51 (p less than 0.01). The mean control EF slope was 4.4 +/- 0.35 m/s2 and after alcohol it was 3.2 +/- 0.73 (p less than 0.01). The control E-F interval was 114 +/- 30 ms and it increased after alcohol to 150 +/- 37 (p less than 0.001). The mean control E wave was 0.54 +/- 0.10 m/s and after alcohol it was 0.43 +/- 0.07 (p less than 0.01). The mean control A wave was 0.30 +/- 0.04 m/s and after alcohol it was 0.35 +/- 0.04 (p less than 0.01). The mean control E/A ratio was 1.80 +/- 0.20 and it fell to 1.25 +/- 0.23 after alcohol ingestion (p less than 0.001). Thus, the results suggest that 4 ounces of whiskey can produce, in normal males, a significant impairment in diastolic function.

Adult↗
PubMed1988

Pulse generator failure due to blunt trauma.

This case describes a 69-year-old male who had a permanent pacemaker implanted for sick sinus syndrome. He was struck by a car with a resultant failure of the pulse generator. Trauma-related failure of a pulse generator is a rare event. Its recognition is imperative in the overall management of the trauma patient.

Accidents, Traffic↗
PubMed1988

The resting cardiointegram: correlation with stress thallium perfusion studies.

The cardiointegram is a noninvasive technique for the analysis of the electrical signals of the heart obtained by a transformation of the voltage versus time format by a series of integrations. The stress thallium perfusion study is a widely used test for the detection of coronary artery disease. In order to evaluate the correlation between the resting cardiointegram and the stress thallium 201 perfusion study, 20 patients with normal resting electrocardiograms underwent stress thallium tests and resting cardiointegrams. The cardiointegram was determined on two resting complexes of leads I, II, V4, V5, and V6 and called abnormal if five of ten complexes deviated outside a normalized template. There was concordance of the cardiointegram and the thallium study in 16 of 20 patients (80%). The sensitivity for the detection of coronary artery disease was 71%, and the specificity was 80%. The overall accuracy was 74%. Thus in patients with normal electrocardiograms, the cardiointegram is a useful noninvasive test for the detection of coronary artery disease.

Coronary Disease↗
PubMed1988

Routine reduction of pulse generator voltage.

The porous-tip electrode has led to a significant advancement in pacing system technology. Experience with 38 patients with unipolar tined CPI porous endocardial electrodes, is reported. All patients had programmable pulse generators, CPI model number 531. The voltage in this pulse generator can be reduced from 5 to 2.5 volts. The pulse width threshold (PWT) at implantation was 0.06 ms at 5 volts in all 38 patients, and the PWT at implantation varied between 0.06 and 0.16 ms at 2.5 volts, with a mean PWT of 0.092 +/- 0.026 ms. The 38 patients were restudied six months later. The mean PWT measured at 5 volts was 0.076 +/- 0.018 ms. The PWT measured at 2.5 volts varied between 0.08 and 0.30 ms with a mean PWT of 0.178 +/- 0.067 ms. Twenty-three patients were restudied one year after lead implantation. The PWT measured at 2.5 volts varied between 0.08 and 0.30 ms with a mean PWT of 0.156 +/- 0.061 ms. All of the pulse generators were reprogrammed to 2.5 volts. This permitted a substantial prolongation of the pulse generator life (three to five years) with an improvement in the cost effectiveness of the pulse generator.

Electrodes↗