Day to day variations in morphology and duration of fragmented ventricular potentials during the late post-myocardial infarction phase in conscious dogs

The relationship between the inducibility of ventricular tachyarrhythmiasand the presence of fractionated epicardial ventricular electrograms(‘late potentials’) was studied daily between days3 and 8 after experimental myocardial infarction in 15 consciousdogs. Before each programmed stimulation, epicardial infarctzone electrograms were recorded from implanted ‘composite’electrodes during sinus rhythm. There was considerable dailyvariation in the morphology and duration of delayed ventricularactivation, but no significant difference in duration of infarctzone electrograms was seen between studies resulting in ventricularfibrillation (108±62ms, mean±SD), sustained ventriculartachycardia (87±18ms), nonsustained (94 ±41 ms)or no tachycardia (78±5 ms). Although fractionated ventricularelectrograms were commonly recorded early after infarction,their presence and duration could not predict the inducibilityof malignant ventricular tachyarrythmias. Similar limitationsmay apply in clinical practice to the use of surface signalaveraging of ventricular late potentials in the early post-myocardialinfarction period.     

Effect of Benoxinate HCI on Human Conjunctival Oxygen Uptake

ABSTRACT Human in vivo conjunctival oxygen uptake (CJOU) was measured before and after instillation of one drop of 0.4% benoxinate HCI. No statistically significant difference in CJOU was found before and after instillation of this anaesthetic. This finding suggests that it is valid to use 0.4% benoxinate HCI in small doses to increase patient compliance and improve technical accuracy during CJOU measurements.     

Pseudophakos: Where Do We Stand?

ABSTRACT Pseudophakos is reviewed with particular reference to the associated complications and risk factors. The risk/benefits are compared with those of spectacles, daily wear and extended wear contact lenses. Each is seen as having its place depending on the individual needs, expectations and risks.     

Traumatic Damage Prevented by Contact Lens Wear

ABSTRACT A PMMA contact lens broke in half on the cornea after impact by a small nail. No damage to the eye was detected when the patient was examined three days after the accident.