QRS amplitude changes during heart filling and digitalization

Manoach, Mordechai; Grosman, Edith; Varon, Dalia; Gitter, S.

doi:10.1016/0002-8703(72)90160-3

Cited by 30 publications

(5 citation statements)

References 3 publications

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“…This result suggests that R-wave amplitude depends to a large extent on left ventricular ®lling volume, i.e. R-wave amplitude increases when the left ventricular ®lling volume increases as has been shown by Brody (1956) and (Manoach et al (1972). However, the percentage increase in R-wave amplitude in water was much larger than that of the I blood velocity.…”

Section: Discussionsupporting

confidence: 52%

Blood flow in the carotid artery during breath-holding in relation to diving bradycardia

Pan

Kinouchi

et al. 1997

European Journal of Applied Physiology

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The present study investigated the mechanism of diving bradycardia. A group of 14 healthy untrained male subjects were examined during breath-holding either out of the water (30-33 degrees C), in heat-out immersion, or in whole-body submersion (27-29 degrees C) in a diving pool. Blood velocity, blood volume flow in the carotid artery, diastolic blood pressure and electrocardiogram were measured and recorded during the experiments. The peak blood velocity increased by 13.6% (P < 0.01) and R-wave amplitude increased by 57.1% (P < 0.005) when the subjects entered water from air. End-diastolic blood velocity (Ved) in the carotid artery increased significantly during breath-holding, e.g. Ved increased from 0.20 (SD 0.02) m.s-1 at rest to 0.33 (SD 0.04) m.s-1 (P < 0.001) at 50.0 s in breath-hold submersion to a 2.0-m depth. Blood volume flow in the carotid artery increased by 26.6% (P < 0.05) at 30 s and 36.6% (P < 0.001) at 40 s in breath-hold submersion to a 2.0-m depth. Diastolic blood pressure increased by 15.4% (P < 0.01) at 60 s during breath-holding in head-out immersion. Blood volume flow, Ved and diastolic blood pressure increased significantly more and faster during breath-holding in submersion than out of the water. There was a good negative correlation with the heart rate: the root mean square correlation coefficient r was 0.73 (P < 0.001). It was concluded that an increased accumulation of blood in the aorta and arteries at end-diastole and decreased venous return, caused by an increase in systemic peripheral resistance during breath-holding, underlies diving bradycardia.

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Section: Discussionsupporting

confidence: 52%

Blood flow in the carotid artery during breath-holding in relation to diving bradycardia

Pan

Kinouchi

et al. 1997

European Journal of Applied Physiology

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“…In a canine model, Manoach et al [8] observed an increase of R-wave amplitude after improvement of LV function with digitalis. Therefore, re duction in myocardial stretching might be an additional factor in determining R-wave amplitude variations.…”

Section: Dear Sirmentioning

confidence: 97%

Dissociation between Alterations in Myocardial Perfusion and R-Wave Amplitude after Hemodialysis

Wizemann¹,

Krämer²,

Thormann³

1983

Nephron

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“…Progressive decrease in both systolic and diastolic heart volumes under the sympathetic drive of exercise may be responsible for this reduction in R wave amplitude (2). Administration of digitalis to animals resulted in an increase in R wave amplitude (13). Decreased heart rate and increased end-diastolic volume might explain this phenomenon (16).…”

Section: Discussionmentioning

confidence: 99%

Factors of Importance for QRS Complex Recovery after Acute Myocardial Infarction

Yusuf

Estrada-Yamamoto

Reyes

et al. 1982

Journal of Internal Medicine

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ABSTRACT. The regression of the ECG signs of myocardial infarction has been studied in 101 patients. A significant increase in R wave amplitude and decrease in Q wave depth on the standard ECG was observed over three months. In 21% of the patients, Q waves disappeared completely. In inferior infarction, these changes were more apparent in the lateral V leads than in the inferior limb leads. Patients with intraventricular conduction defects were excluded. Two factors associated with the Q and R wave changes have been identified. Lower heart rates appeared to facilitate the recovery of R waves, and smaller infarcts, as assessed by peak LDH, showed greater ECG recovery. This study raises the interesting possibility that modification of the heart rate may affect favourably the healing process after an acute myocardial infarction.

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QRS amplitude changes during heart filling and digitalization

Cited by 30 publications

References 3 publications

Blood flow in the carotid artery during breath-holding in relation to diving bradycardia

Blood flow in the carotid artery during breath-holding in relation to diving bradycardia

Dissociation between Alterations in Myocardial Perfusion and R-Wave Amplitude after Hemodialysis

Factors of Importance for QRS Complex Recovery after Acute Myocardial Infarction

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