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Biomedical subjects

H J Marriott

Publications and source records attributed to H J Marriott.

At least 19 recordsLinked to original sources
PubMed1990

Differential diagnosis of supraventricular and ventricular tachycardia.

Few if any medical decisions are of more urgent importance than the accurate discrimination between ventricular tachycardia and supraventricular tachycardia with ventricular aberration, and probably no common diagnosis is more often missed. Yet the distinction can often be readily made with a knowledge of the several clues here described. These include QRS morphology, polarity and width; and clinical or electrocardiographic evidence of independent atrial activity. Knowledge and application of these serviceable clues should enable the clinician to establish a correct diagnosis in 90% of wide-QRS tachycardias without resorting to invasive studies.

Diagnosis, Differential↗
PubMed1989

Why are so many critical care nurses unable to recognize ventricular tachycardia in the 12-lead electrocardiogram?

We submitted the 12-lead electrocardiogram of an easily recognized ventricular tachycardia to more than 2500 critical care nurses for diagnosis. Seventy-eight percent of these failed to diagnose ventricular tachycardia, opting for supraventricular tachycardia with ventricular aberration. It was clear that only 0.5% of 2500 experienced nurses knew the three clues available for diagnosing ventricular tachycardia.

Critical Care↗
PubMed1985

Left bundle branch block with right axis deviation: a marker of congestive cardiomyopathy.

Three patients with primary congestive cardiomyopathy (COCM), complete left bundle branch block (LBBB) and right axis deviation in the standard leads are described. Review of 50 additional patients from the literature since 1950 indicates that the uncommon combination of LBBB and RAD is a marker of severe myocardial disease, especially COCM. The mechanism of production of this electrocardiographic pattern appears to be diffuse conduction system involvement in advanced myocardial disease.

Adult↗
PubMed1977

Improved ECG monitoring during cardiac catheterization using radiotransparent electrodes and chest leads.

Improved electrocardiographic monitoring during cardiac catheterization and angiography is achieved when precordial leads can be used and base line wander and muscle artifact are eliminated or reduced. This can be realized with the use of radiotransparent gold electrodes applied to the chest in C1 and C6 locations. Radiotransparency of the electrodes enables them to be situated on the chest wall throughout the diagnostic procedures without interfering with the radiographic image. The electrical stability of gold helps to eliminate base line drift; the precordial location is less subject to movement and muscle artifact and less restricting for the patient. The electrodes are made from gold film vacuum-deposited on 2 mil mylar with a copper wire five-thousandths of an inch in diameter mounted between two layers of plastic tape. The benefits of this arrangement have been observed in a series of ten patients undergoing cardiac catheterization.

Cardiac Catheterization↗
PubMed1976

Electrocardiographic changes in precordial leads during selective coronary angiography.

Precordial electrocardiographic leads V1, V2, V5, V6, and limb leads I and II were recorded simultaneously utilizing radio transparent electrodes and wire leads during coronary angiography in 35 patients with obstructive coronary disease and in 17 subjects with normal coronary angiograms. The pattern of electrocardiographic changes produced by injection of contrast material into either the right or left coronary artery was similar in both groups of patients. During injections into the left coronary artery a leftward shift of the QRS occurred. Injections into the right coronary artery also produced a leftward shift of depolarization forces but, in addition, the QRS became inferiorly directed more consistently than during left coronary injections. The changes produced by angiography in the pattern of repolarization consisted of a marked increase in T wave amplitude and the transient appearance of large U waves. The changes in T waves were consistently opposite in direction to those of the QRS. The polarity of the U wave coincided with that of the T wave in the majority of cases. No consistent differences in the pattern of electrocardiographic changes were observed in subjects with a dominant right coronary artery from those with a dominant left system nor in subjects with normal coronaries from those with occlusive coronary disease.

Angiography↗
PubMed1975

De subitaneis mortibus. XI. Young girl with palpitations.

A seventeen-year-old girl in apparent good health was found dead in bed one morning. Two clinical features of note were multiple premature beats present in her electrocardiograms for several years, and a tall thin habitus without stigmata of Marfan's syndrome. At necropsy examination the heart was grossly normal. At its margin abutting the central fibrous body the atrioventricular (A-V) node exhibited numerous fronds and outcroppings, some forming loop connections from one part of A-V node to another. Groups of A-V nodal cells detached from the A-V node were also found connected to the crest of the interventricular septum. There were large connections directly from the His bundle to the crest of the interventricular septum (Mahaim fibers). The A-V node artery was moderately narrowed but patent. The possible significance of these findings in the pathogenesis of re-entrant arrhythmias or ectopic automaticity is discussed.

Adolescent↗
PubMed1975

Atrial diastolic friction.

A typical triphasic pericardial rub was heard in a patient with acute myocardial infarction. Phonocardiograms during atrioventricular block demonstrated a fourth rub component in atrial diastole following every sufficiently isolated P wave.

Aged↗
PubMedDate not supplied

Ventricular tachycardia: noninvasive differentiation from supraventricular tachycardia.

The paramount importance of differentiating the wide-QRS tachycardias is stressed, and the alarming frequency of errors made by practicing physicians and cardiovascular nurses is documented. The most common causes of error are outlined, of which the most important is ignorance of diagnostically helpful QRS morphology in the electrocardiogram (EKG). The QRS contours and polarity that are useful in diagnosis are described in detail and illustrated. Finally, certain compromises in electrode placement that may be necessary in the operating room are suggested.

Diagnosis, Differential↗
PubMedDate not supplied

Potential benefits of a computer ECG interpretation system for primary care physicians in a community hospital.

One hundred fifteen ECGs from a hospital service were interpreted by 2 primary care physicians and 2 expert electrocardiographers. When their interpretations were compared with one another and with the Marquette MAC II ECG Interpretation Program, there was great variability. Computer ECG interpretations appeared to benefit primary care physicians most by providing a backup opinion. This second opinion was also of use to expert electrocardiographers. Additional long-term benefits that may be derived from computer systems include improvement of physician interpretation ability, reduction in interpretation time, and standardization of electrocardiographic nomenclature and criteria.

Diagnosis, Computer-Assisted↗