The frontal plane QRS axis of the standard 12-lead electrocardiogram (ECG) is easily and accurately measured by the clinician. A simple method of estimating this axis is discussed. This axis is age-dependent. We reviewed the literature to determine if evidence exists of an association between an "abnormal" QRS axis and clinically significant myocardial disease. We also examined the literature for clinical correlation of a "normal" QRS axis with the absence of myocardial pathology. We found that although an abnormal QRS axis (falling outside the limits of +30 degrees and +90 degrees) occurs in a small number of normal individuals, its presence should prompt a thorough evaluation of all the parameters of the ECG to look for myocardial disease.

Cardiomyopathies↗

PubMedDate not supplied

Post-triathalon delirium.

This is a case presentation of acute delirium in a previously healthy man. It was originally discussed during Morbidity and Mortality Conference at The George Washington, Georgetown Residency Program in Emergency Medicine, December 1989.

Adult↗

PubMedDate not supplied

Neonatal Trichomonas vaginalis infection.

Clinical infection with Trichomonas vaginalis (T. vaginalis) in the neonate is an unusual occurrence. We present a case of T. vaginalis in a 2-week-old girl with vaginal discharge. Our patient had complete resolution of symptoms after treatment with metronidazole. We found few references in the medical literature on the treatment of this condition. This report discusses the pathogenesis and treatment of T. vaginalis in the neonate.

Female↗

PubMedDate not supplied

Task relevance enhances early transient and late slow-wave activity of distributed cortical sources.

The primary purpose of these studies was to link together concepts related to attention/working memory and feedforward/feedback activity using MEG response profiles obtained in humans. Similar to recent studies of attention in monkeys, we show early "spike-like" activity (<200 ms poststimulus), most likely reflecting an early transient excitatory response mixed with feedback influences, followed by "slow-wave" activity (>200 ms poststimulus) in MEG cortical response profiles evoked by a visual working memory task. We experimentally dissociated the early transient activity from the later sustained activity (predominantly feedback) by conducting an auditory size classification task. Words, representing common objects, evoked activity in occipital cortex (presumably due to imagery) even though visual stimuli were not present in this task. The initial "spike" was absent from the response profile obtained from occipital cortex, leaving only "slow-wave" activity, thereby allowing us to characterize or profile feedback activity in this situation. Attention or task relevance enhanced the initial "spike" and "slow-wave" activity in visually responsive areas. Prefrontal activity, along the superior frontal sulcus, evoked by the working memory task, was active later in time than initial activity in visual cortex and later than the earliest effect of attention modulation in visual cortex.

Acoustic Stimulation↗