crustacean cardioexcitatory peptides may inhibit the heart in vivo
... upstream of the heart (Alexandrowicz, 1953), or infused into the sinus may affect heart function directly, by acting on either the cardiac ganglion or myocardium, or indirectly via the central nervous system (CNS). Nearly all the work on naturally occurring cardiac peptides has been carried out on i ...
... upstream of the heart (Alexandrowicz, 1953), or infused into the sinus may affect heart function directly, by acting on either the cardiac ganglion or myocardium, or indirectly via the central nervous system (CNS). Nearly all the work on naturally occurring cardiac peptides has been carried out on i ...
Physiology and Anatomy of the Heart - An
... These cells can initiate not only their own depolarization, but that of the rest of the heart as well, in a spontaneous and rhythmic way (automaticity) or (autorhythmicity) ...
... These cells can initiate not only their own depolarization, but that of the rest of the heart as well, in a spontaneous and rhythmic way (automaticity) or (autorhythmicity) ...
(aed) devices and cardiopulmonary resuscitation (cpr)
... heart function, most often caused by a sudden arrhythmia, such as ventricular fibrillation (VF). When this occurs, the heart’s electrical impulses suddenly become chaotic and ineffective. Blood flow to the brain abruptly stops and the victim collapses and quickly loses consciousness. Death usually f ...
... heart function, most often caused by a sudden arrhythmia, such as ventricular fibrillation (VF). When this occurs, the heart’s electrical impulses suddenly become chaotic and ineffective. Blood flow to the brain abruptly stops and the victim collapses and quickly loses consciousness. Death usually f ...
QT Interval: The Proper Measurement Techniques.
... should be applied to QT interval measurements. This allows QT measurements to be compared over time and to normal cut offs independent of heart rate. Many corrections exist, each with its own benefits and shortcomings. Unfortunately, no consensus exists on which correction is most effective (Table 1 ...
... should be applied to QT interval measurements. This allows QT measurements to be compared over time and to normal cut offs independent of heart rate. Many corrections exist, each with its own benefits and shortcomings. Unfortunately, no consensus exists on which correction is most effective (Table 1 ...
MAYO CLINIC HEALTH LETTER
... rate greater than 100 beats a minute — is called tachycardia. A slow heartbeat — a resting heart rate of less than 60 beats a minute — is called bradycardia. Rarely do slower heart rates cause the sensation of palpitations. Palpitations can be associated with many types of arrhythmias, ranging from ...
... rate greater than 100 beats a minute — is called tachycardia. A slow heartbeat — a resting heart rate of less than 60 beats a minute — is called bradycardia. Rarely do slower heart rates cause the sensation of palpitations. Palpitations can be associated with many types of arrhythmias, ranging from ...
MAYO CLINIC HEALTH LETTER Palpitations Reliable Information for a Healthier Life
... rate greater than 100 beats a minute — is called tachycardia. A slow heartbeat — a resting heart rate of less than 60 beats a minute — is called bradycardia. Rarely do slower heart rates cause the sensation of palpitations. Palpitations can be associated with many types of arrhythmias, ranging from ...
... rate greater than 100 beats a minute — is called tachycardia. A slow heartbeat — a resting heart rate of less than 60 beats a minute — is called bradycardia. Rarely do slower heart rates cause the sensation of palpitations. Palpitations can be associated with many types of arrhythmias, ranging from ...
Metabolic Studies on Cardiac Tissue Obtained by Needle Biopsy in
... what more difficult. This ultimately limits the number of successful biopsies in a single dog. As the needle may be passed through this area of fibrosis, a small piece of fibrous tissue is sometimes attached to the end of the specimen of cardiac muscle. This is easily distinguished from muscle by gr ...
... what more difficult. This ultimately limits the number of successful biopsies in a single dog. As the needle may be passed through this area of fibrosis, a small piece of fibrous tissue is sometimes attached to the end of the specimen of cardiac muscle. This is easily distinguished from muscle by gr ...
heart and seizure stuff SMA 31may2011
... are consistent with clinical reports of severe SMA cases that describe a number of cardiac defects. To fully address this disease, any new therapies or drugs must be effective in every tissue, not just motor neurons. The more we understand the disease, the better off we will be in terms of developin ...
... are consistent with clinical reports of severe SMA cases that describe a number of cardiac defects. To fully address this disease, any new therapies or drugs must be effective in every tissue, not just motor neurons. The more we understand the disease, the better off we will be in terms of developin ...
pdf Living with an ICD
... ICD system is prescribed by your physician. This treatment is not for everyone. Please talk to your doctor to see if it is right for you. Your physician should discuss all potential benefits and risks with you. Although many patients benefit from the use of this treatment, results may vary. For furt ...
... ICD system is prescribed by your physician. This treatment is not for everyone. Please talk to your doctor to see if it is right for you. Your physician should discuss all potential benefits and risks with you. Although many patients benefit from the use of this treatment, results may vary. For furt ...
life with an implantable defibrillator
... physician. This treatment is not for everyone. Please talk to your doctor to see if it is right for you. Your physician should discuss all potential benefits and risks with you. Although many patients benefit from the use of this treatment, results may vary. For further information, please call the ...
... physician. This treatment is not for everyone. Please talk to your doctor to see if it is right for you. Your physician should discuss all potential benefits and risks with you. Although many patients benefit from the use of this treatment, results may vary. For further information, please call the ...
Review - p - the Health Science Program
... created by passing of ions (charged particles) through the cell membrane. The electricity is than conducted, transmitted to other specialized cells that together with the pacemaker cells create the conductive system of the heart, the necessary wires and switches to stimulate cardiac muscle fibers fo ...
... created by passing of ions (charged particles) through the cell membrane. The electricity is than conducted, transmitted to other specialized cells that together with the pacemaker cells create the conductive system of the heart, the necessary wires and switches to stimulate cardiac muscle fibers fo ...
Anatomical Survey: Observation of Physical and Functional
... blood-containing chambers: two atria and two ventricles. Atria are filling chambers that collect incoming blood (either from the lungs via the pulmonary veins or the body via the inferior and superior vena cava). These chambers are closed off from the more inferior ventricles by a pair of valves (tr ...
... blood-containing chambers: two atria and two ventricles. Atria are filling chambers that collect incoming blood (either from the lungs via the pulmonary veins or the body via the inferior and superior vena cava). These chambers are closed off from the more inferior ventricles by a pair of valves (tr ...
Lazarus A. Remote, wireless, ambulatory monitoring of implantable
... The percentages of patients with specific events transmitted to the service center by HM in 3,039 recipients of dual chamber ICDs during a mean follow-up of 11.7 ± 9.3 months (range 1–49) are shown in Figure 2B, and are similar to those observed with single chamber ICDs, except for the detection of ...
... The percentages of patients with specific events transmitted to the service center by HM in 3,039 recipients of dual chamber ICDs during a mean follow-up of 11.7 ± 9.3 months (range 1–49) are shown in Figure 2B, and are similar to those observed with single chamber ICDs, except for the detection of ...
Heart Rate Variability Anatomy and Physiology
... fibers function as pacemakers and provide a conduction pathway for pacemaker potentials. The sinoatrial (SA) node and atrioventricular (AV) node are the two internal pacemakers that are primarily responsible for the heart rhythm. The electrocardiogram (ECG) records the action of this electrical cond ...
... fibers function as pacemakers and provide a conduction pathway for pacemaker potentials. The sinoatrial (SA) node and atrioventricular (AV) node are the two internal pacemakers that are primarily responsible for the heart rhythm. The electrocardiogram (ECG) records the action of this electrical cond ...
Inherited Cardiac Arrhythmias
... Background: The incidence of sudden cardiac death in persons under age 40 is roughly 3 per 100 000 persons per year in Germany and North America. Many of these deaths are found to be due to hereditary heart diseases, often a primary structural heart disease associated with arrhythmia or else a prima ...
... Background: The incidence of sudden cardiac death in persons under age 40 is roughly 3 per 100 000 persons per year in Germany and North America. Many of these deaths are found to be due to hereditary heart diseases, often a primary structural heart disease associated with arrhythmia or else a prima ...
Training - faculty at Chemeketa
... -PVC-Wide, Bizarre QRS Complex, Look at underlying rhythm. Can appear in couplets, triplets, or short runs of VT. Can be multi-focal or uni-focal. Caused by random firing within the ventricles. No atrial firing. -PAC-Conducted beat appearing in an otherwise normal rhythm. Stimuli originates within t ...
... -PVC-Wide, Bizarre QRS Complex, Look at underlying rhythm. Can appear in couplets, triplets, or short runs of VT. Can be multi-focal or uni-focal. Caused by random firing within the ventricles. No atrial firing. -PAC-Conducted beat appearing in an otherwise normal rhythm. Stimuli originates within t ...
ATRIAL FIBRILLATION DECISION AID
... the lower chambers (ventricles). This sequence allows priming of the pumping chambers and contributes as much as 20% of the output of the heart. In atrial fibrillation, the heart’s natural pacemaker, the sinus node, no longer generates an electrical impulse. Instead electrical activity occurs irregu ...
... the lower chambers (ventricles). This sequence allows priming of the pumping chambers and contributes as much as 20% of the output of the heart. In atrial fibrillation, the heart’s natural pacemaker, the sinus node, no longer generates an electrical impulse. Instead electrical activity occurs irregu ...
Influence of respiratory rate on the effectiveness of exercise
... called heart revolution (fig. 10.1.). systolic atrial fibrillation, which takes 0.1 seconds, the contraction of the ventricles, or The heart is a pump inlet - removal, blood ventricular systolic, which takes 0.3 flow is possible due to its rhythmic seconds, relaxation (recovery) of all hearts, contr ...
... called heart revolution (fig. 10.1.). systolic atrial fibrillation, which takes 0.1 seconds, the contraction of the ventricles, or The heart is a pump inlet - removal, blood ventricular systolic, which takes 0.3 flow is possible due to its rhythmic seconds, relaxation (recovery) of all hearts, contr ...
Electrophysiological recognition of an atrio
... patients with atrio-ventricular Mahaim fibres (AVMF). Pre-excitation, due to there being a shorter distance between the sino-atrial node (SAN) and the MF than there is between the SAN and AVN, gives rise to short PR intervals and a delta wave preceding the R wave (Figure 1). The R wave transition be ...
... patients with atrio-ventricular Mahaim fibres (AVMF). Pre-excitation, due to there being a shorter distance between the sino-atrial node (SAN) and the MF than there is between the SAN and AVN, gives rise to short PR intervals and a delta wave preceding the R wave (Figure 1). The R wave transition be ...
Development of a Training System for Cardiac Muscle Palpation
... pressure does not increase because the left atrium pressure is fixed. As the result, the cardiac output decrease in about 74 [%] when the virtual heart is pushed 8 [mm]. Fig.8 shows the performance for the response of the palpation system. In accord with the displacement of the manipulator operatio ...
... pressure does not increase because the left atrium pressure is fixed. As the result, the cardiac output decrease in about 74 [%] when the virtual heart is pushed 8 [mm]. Fig.8 shows the performance for the response of the palpation system. In accord with the displacement of the manipulator operatio ...
The normal range and determinants of the intrinsic heart rate in man
... published in 1969 [4]. In those studies it had already been established that heart rate becomes fixed under the combined presence of atropine and propranolol, which is considered to cause complete autonomic blockade. However, propranolol only partially interferes with the activity of the sympathetic ...
... published in 1969 [4]. In those studies it had already been established that heart rate becomes fixed under the combined presence of atropine and propranolol, which is considered to cause complete autonomic blockade. However, propranolol only partially interferes with the activity of the sympathetic ...
First use of cardiac contractility modulation (CCM) in a patient failing
... that the implantation is technically feasible, that the OPTIMIZER and CRT-D devices can coexist without interference and that acute haemodynamic and clinical improvements can be observed. The results suggest that systematic investigation of CCM treatment in CRT nonresponders is warranted. © 2007 Eur ...
... that the implantation is technically feasible, that the OPTIMIZER and CRT-D devices can coexist without interference and that acute haemodynamic and clinical improvements can be observed. The results suggest that systematic investigation of CCM treatment in CRT nonresponders is warranted. © 2007 Eur ...
Rate Control in Atrial Fibrillation: Avoiding Morbidity
... rhythm, while limited, may seem to have more sway. Finally, patients refractory to heart rate control, with very elevated ventricular rates despite medical therapy, would likely benefit from maintenance of sinus rhythm. The goals of therapy with rate control in atrial fibrillation are quite simple: ...
... rhythm, while limited, may seem to have more sway. Finally, patients refractory to heart rate control, with very elevated ventricular rates despite medical therapy, would likely benefit from maintenance of sinus rhythm. The goals of therapy with rate control in atrial fibrillation are quite simple: ...
The Syndrome of Dextroversion of the Heart
... easily recognized because it is practically always associated with some degree of abdominal situs inversus, rarely are there any other cardiac abnormalities, and the electrocardiographic changes it produces are diagnostic, with inverted P, QRS, and T waves in lead I. The second cause of dextrocardia ...
... easily recognized because it is practically always associated with some degree of abdominal situs inversus, rarely are there any other cardiac abnormalities, and the electrocardiographic changes it produces are diagnostic, with inverted P, QRS, and T waves in lead I. The second cause of dextrocardia ...