A feature of phasic coronary flow patterns recorded in conscious chronically instrumented dogs is the atrial cove--a transient depression of arterial flow that occurs during atrial systole. The association between the hemodynamic effects of atrial systole and the atrial cove was studied in anesthetized dogs and pigs with complete heart block. Many atrial coves are available for study in these p...

A closed Riemannian n-manifold M with Ricci M > n 1 has diameter < 7r ([M]), and equality holds only if M is isometric to the unit sphere S ~ ([Cn]). Given these results, it is natural to ask whether M is diffeomorphic to S n if the diameter of M is almost 7r. This question was answered negatively by Anderson and Otsu, who showed that even the topology of such a space can be different from the ...

A 59-year-old male with a history of traumatic C4 quadriplegia, seizure disorder, and adrenal insufficiency presented to our institution with recurrent seizures. During his hospital stay, he had labile body temperatures due to C4 spinal injury-mediated autonomic dysfunction. His M-Mode Echocardiogram revealed prolonged opening of aortic valve (AV) and late opening of mitral valve (MV) (Fig. 1A,...

We prove three optimal conformal geometric inequalities of C. Blatter type on every Riemannian Klein bottle. These inequalities provide conformal lower bounds on the area and involve lengths of homotopy classes of curves that are natural candidates to realize the systole.

In a previous communication (1) we have briefly described the electrocardiographic changes of the QT interval during exercise in normal subjects. On the average the corrected QT interval or K was 7% greater than that observed during rest, and with the onset of recovery it diminished by 9%o within the first two minutes and gradually returned to the original value at rest. There was no significan...

A case of stone heart syndrome is reported in a pregnant 27 year old West African patient, who suffered syncopal symptoms shortly before cardiac arrest. The electrocardiographic features were those of asystole, but direct examination of the heart at emergency thoracotomy in the A&E department revealed tetanic contracture of the organ. At necropsy, the heart was of normal weight but showed areas...

This letter is intended to extend the discussion of Bellamy's (1978) intriguing analysis of diastolic coronary artery pressure-flow relations in dogs during long diastoles. In reactive hyperemia (RH), he found practically linear diastolic pressure-flow relations. These linear pressure-flow relations led him to the conclusion that coronary resistance, R, remains constant during diastole, and con...