Acta medica Scandinavica. Supplementum
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Acta Med. Scand. Suppl. · Jan 1982
Randomized Controlled Trial Clinical TrialSelf-control of interbeat interval and pulse transit time at rest and during exercise. A preliminary report.
Attempts were made to establish self-control of interbeat interval (IBI) and pulse transit time (PTT) by providing appropriate biofeedback information to volunteers at rest and during dynamic and isometric exercise. Product feedback (IBI X PTT) was found more reliable than simple heart rate (HR) and systolic blood pressure (SBP) during dynamic exercise. ⋯ Possible reasons for this failure are discussed. Preliminary results of feedback training given to 7 anginal patients suggest that such procedures might help to lower nitroglycerin consumption, decrease the frequency of anginal attacks and increase exercise tolerance.
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Acta Med. Scand. Suppl. · Jan 1982
Haemodynamic effects of prenalterol in patients with severe congestive heart failure--NYHA III-IV.
In 12 patients with severe congestive heart failure due to ischaemic heart disease (n = 6) and due to congestive cardiomyopathy (n = 6) the haemodynamic effects of a new beta 1-agonist, prenalterol, were studied. Left ventricular (LV) function was studied before and 20 min after infusion of 12 mg prenalterol. Heart rate was kept constant by atrial pacing at a rate of 100 min-1 unless intrinsic heart rate exceeded it. ⋯ Our study could demonstrate, even in patients with severe heart failure, a sustained positive inotropic effect of prenalterol leading to an improved left ventricular contractility, relaxation and compliance. LV power and work was enhanced. The increase of oxygen demand seemed to be counterbalanced by an improved perfusion of particularly subendocardial layers indicated by an increased transmyocardial pressure gradient.
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Effort-related chest pain and chest pain fulfilling the criteria of the Rose questionnaire for angina pectoris are often used as evidence for coronary heart disease. In patients with different kinds of oesophageal dysfunction (OD) the frequency of chest pain of angina-like type was studied and compared to that in the general population. ⋯ The chest pain was effort-related in 70% and in almost half of the cases their chest pain was classified as angina pectoris according to the Rose questionnaire. Since angina-like chest pain is a predominant symptoms in patients with OD and OD is far more common than angina pectoris due to myocardial ischemia in the general population, it is reasonable to assume that the oesophagus and not the heart is the most common source of angina-like chest pain.
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Acta Med. Scand. Suppl. · Jan 1976
Experiences with a new myocardial electrode for permanent cardiac pacing.
The first experiences with a new myocardial sutureless screw-in electrode for cardiac pacing are reported. A brief description of the technique is given. The electrode can be inserted quickly and safely under direct vision through a small anterior thoracotomy using a special inserter tool. ⋯ We have observed defective or unstable pacing with endocardial electrode in a high proportion of patients in our series early after the implantation and even after many years of perfect pacing. When there are problems with an endocardial lead an epi- or myocardial electrode can be used. This paper reports experiences with a new sutureless myocardial electrode (Medtronic model 6917).