Determinants of an abnormal response to exercise in patients with asymptomatic valvular aortic stenosis.

Aim: Patients with asymptomatic aortic stenosis (AS) and abnormal haemodynamic responses to exercise testing are at increased risk of cardiac events. This study assesses the Doppler echocardiographic determinants of a positive exercise test in a cohort of asymptomatic patients with AS.

Methods And Results: One hundred and twenty-eight patients with AS underwent quantitative Doppler echocardiographic measurements at rest and during exercise test.

[How I explore ... value of isotopic techniques in the detection of sepsis in valvular prostheses].

Vascular graft infection is a rare but serious complication of vascular surgery. The diagnosis is frequently difficult. White blood cell imaging (111In or 99mTc-HMPAO) is an adequate technique for detecting vascular graft infection.

[Severe bradyarrhythmia during myocardial perfusion scintigraphy with injection of dipyridamole (Persantine)].

We describe two cases of severe bradyarrhythmias (one complete AV dissociation; one sinus bradycardia) observed after the intravenous injection of dipyridamole.