CARDIAC CYCLE
... in the great arteries The A/P valves open – Further contraction of the ventricles causes – blood flow at a relatively constant pressure ...
... in the great arteries The A/P valves open – Further contraction of the ventricles causes – blood flow at a relatively constant pressure ...
CARDIAC CYCLE
... in the great arteries The A/P valves open – Further contraction of the ventricles causes – blood flow at a relatively constant pressure (this is because the aorta is compliant as well – and increase in volume causes only a small increase in pressure) ...
... in the great arteries The A/P valves open – Further contraction of the ventricles causes – blood flow at a relatively constant pressure (this is because the aorta is compliant as well – and increase in volume causes only a small increase in pressure) ...
Hypertrophic Cardiomyopathy (HCM)
... So why don’t we just do genetic testing on everyone for HCM? More than 700 different genetic abnormalities have been identified in patients with HCM, so which ones do we test for? However, if someone in the family has this condition, the specific genetic abnormality of that individual can be identif ...
... So why don’t we just do genetic testing on everyone for HCM? More than 700 different genetic abnormalities have been identified in patients with HCM, so which ones do we test for? However, if someone in the family has this condition, the specific genetic abnormality of that individual can be identif ...
1551962 Targeting Toll-Like Receptor 4 (TLR4) Protects Against
... Bar-Ilan University, Ramat Gan, Israel; 3Rabin Medical Center, Tel Aviv University, Petah Tikva, Israel Toll like receptors are expressed in immune cells and cardiac muscle. We examined whether the cardiac TLR4 is involved in the acute myocardial dysfunction caused by septic shock and myocardial isc ...
... Bar-Ilan University, Ramat Gan, Israel; 3Rabin Medical Center, Tel Aviv University, Petah Tikva, Israel Toll like receptors are expressed in immune cells and cardiac muscle. We examined whether the cardiac TLR4 is involved in the acute myocardial dysfunction caused by septic shock and myocardial isc ...
Download Hopkins Pulse Summer 2014 as a PDF
... The remedy can the lower chambers, or ventricles. The pulse causes the ventricles to contract near-simultaneously to pump blood be as simple as up and out of the ventricles and into the lungs and body. adjusting the In people with atrial fibrillation, the electrical impulses device, modifying come f ...
... The remedy can the lower chambers, or ventricles. The pulse causes the ventricles to contract near-simultaneously to pump blood be as simple as up and out of the ventricles and into the lungs and body. adjusting the In people with atrial fibrillation, the electrical impulses device, modifying come f ...
Chapter 18 Powerpoint B
... 1 Pacemaker potential This slow depolarization is due to both opening of Na+ channels and closing of K+ channels. Notice that the membrane potential is ...
... 1 Pacemaker potential This slow depolarization is due to both opening of Na+ channels and closing of K+ channels. Notice that the membrane potential is ...
Fulltext - Jultika
... inversions. In contrast, inverted T-waves in other leads than V1–V3 were associated with higher risk of cardiovascular mortality and SCD. Altogether 2.1% of the study participants presented with a prolonged PR interval > 200 ms. No rise in overall mortality, SCD, or hospitalizations due to heart fai ...
... inversions. In contrast, inverted T-waves in other leads than V1–V3 were associated with higher risk of cardiovascular mortality and SCD. Altogether 2.1% of the study participants presented with a prolonged PR interval > 200 ms. No rise in overall mortality, SCD, or hospitalizations due to heart fai ...
pacemaker basics
... extends into the endocardial tissue – Allows for lead positioning anywhere in the heart’s chamber – The helix is extended using an included tool ...
... extends into the endocardial tissue – Allows for lead positioning anywhere in the heart’s chamber – The helix is extended using an included tool ...
PDF Version
... use of ECG is not fool-proof. There are certain conditions that cannot be identified with ECG (e.g. coronary artery anomalies), and some athletes may die of acquired disorders such as myocarditis which may not have been present during the PPS. Therefore, measures should be taken to protect all athle ...
... use of ECG is not fool-proof. There are certain conditions that cannot be identified with ECG (e.g. coronary artery anomalies), and some athletes may die of acquired disorders such as myocarditis which may not have been present during the PPS. Therefore, measures should be taken to protect all athle ...
Egan Ch 17 Interpreting the Electrocardiogram
... ventricles is completely blocked • Atria & ventricles are paced independently & there is no relationship between P waves & QRS ...
... ventricles is completely blocked • Atria & ventricles are paced independently & there is no relationship between P waves & QRS ...
Pathologie et conséquences cliniques de l`insuffisance cardiaque
... Especially important in Right Heart Disease where the loading conditions are often abnormal. The hope is that such an index would better predict long term survival or recovery after corrective surgery ...
... Especially important in Right Heart Disease where the loading conditions are often abnormal. The hope is that such an index would better predict long term survival or recovery after corrective surgery ...
Atrial Fibrillation: Management Strategies
... Predictors of Recurrence in Patients Undergoing Cryoballoon Ablation for Treatment of Atrial Fibrillation: The Independent Role of Sleep-Disordered Breathing ...
... Predictors of Recurrence in Patients Undergoing Cryoballoon Ablation for Treatment of Atrial Fibrillation: The Independent Role of Sleep-Disordered Breathing ...
1 1. CONTRACTILITY OF THE MYOCARDIUM The performance of
... Stimulate the rat ventricular strip at 0.2 Hz (for toad heart use 1/30 Hz). Determine the minimum length at which active tension is first developed. Choosing a time base appropriate to display the twitch optimally, position the first response near the bottom of the screen. Now stretch the muscle by ...
... Stimulate the rat ventricular strip at 0.2 Hz (for toad heart use 1/30 Hz). Determine the minimum length at which active tension is first developed. Choosing a time base appropriate to display the twitch optimally, position the first response near the bottom of the screen. Now stretch the muscle by ...
Reem A Heart
... atrioventricular (AV) bundle (bundle of His). extends into the interventricular septum and then divides into one right and two left bundle branches. Conduct the impulse to conduction fibers called Purkinje fibers in the heart apex. Purkinje fibers are larger than other cardiac muscle fibers. Mus ...
... atrioventricular (AV) bundle (bundle of His). extends into the interventricular septum and then divides into one right and two left bundle branches. Conduct the impulse to conduction fibers called Purkinje fibers in the heart apex. Purkinje fibers are larger than other cardiac muscle fibers. Mus ...
Chapter 12 Practice Test 2012
... a) AV bundle b) SA node c) AV node d) Purkinje fibers 41. ____ The following are the components of the conducting system of the heart: (1) Purkinje cells (2) AV bundle (3) AV node (4) SA node (5) bundle branches. The sequence in which an action potential would move through this system is… a) 1, 4, 3 ...
... a) AV bundle b) SA node c) AV node d) Purkinje fibers 41. ____ The following are the components of the conducting system of the heart: (1) Purkinje cells (2) AV bundle (3) AV node (4) SA node (5) bundle branches. The sequence in which an action potential would move through this system is… a) 1, 4, 3 ...
Editor – Dean F. Connors, MD, PhD
... prevents high ventricular rates. Some DDD pacemakers are programmed to enter the DDI mode when high atrial rates occur. The fourth position, rate modulation, increases the patient’s heart rate in response to “patient exercise”. A number of mechanisms (vibration, respiration, and pressure) are used t ...
... prevents high ventricular rates. Some DDD pacemakers are programmed to enter the DDI mode when high atrial rates occur. The fourth position, rate modulation, increases the patient’s heart rate in response to “patient exercise”. A number of mechanisms (vibration, respiration, and pressure) are used t ...
CVS_Part2
... Angina pectoris Stable angina, the most common form and therefore called typical angina pectoris, appears to be caused by the reduction of coronary perfusion to a critical level by chronic stenosing coronary atherosclerosis; this renders the heart vulnerable to further ischemia whenever there is ...
... Angina pectoris Stable angina, the most common form and therefore called typical angina pectoris, appears to be caused by the reduction of coronary perfusion to a critical level by chronic stenosing coronary atherosclerosis; this renders the heart vulnerable to further ischemia whenever there is ...
notes - Anatomy with Dr. Mumaugh
... Coronary arteries: Myocardial cells receive blood from the right and left coronary arteries Veins of Coronary Circulation : As a rule, veins follow a course that closely parallels that of coronary arteries Nerve Supply of the Heart Conduction system of the heart: composed of modified cardiac m ...
... Coronary arteries: Myocardial cells receive blood from the right and left coronary arteries Veins of Coronary Circulation : As a rule, veins follow a course that closely parallels that of coronary arteries Nerve Supply of the Heart Conduction system of the heart: composed of modified cardiac m ...
Congestive Heart Failure
... Diphtheria myocarditis – due to a toxin rather than bacterial invasion. There is some inflammation, myocyte changes (see the big nucleolus). Myocyte necrosis (not shown) also happens. ...
... Diphtheria myocarditis – due to a toxin rather than bacterial invasion. There is some inflammation, myocyte changes (see the big nucleolus). Myocyte necrosis (not shown) also happens. ...
AEMED A 20-Year-Old Patient with Idiopathic Non
... in our patient, individuals with idiopathic ventricular tachycardia of outflow origin are typically hemodynamically stable and usually present with symptoms of dizziness or palpitations. These tachycardias may either occur as repetitive monomorphic non-sustained ventricular tachycardia attacks, as i ...
... in our patient, individuals with idiopathic ventricular tachycardia of outflow origin are typically hemodynamically stable and usually present with symptoms of dizziness or palpitations. These tachycardias may either occur as repetitive monomorphic non-sustained ventricular tachycardia attacks, as i ...
cardiovascular complications of scorpion stings and the effects of
... complications.9 We did not encounter any patients during the prospective study period with serious neurologic complications who did not have some cardiovascular manifestations. The spectrum of cardiovascular complications that we encountered included electrocardiographic features simulating myocardi ...
... complications.9 We did not encounter any patients during the prospective study period with serious neurologic complications who did not have some cardiovascular manifestations. The spectrum of cardiovascular complications that we encountered included electrocardiographic features simulating myocardi ...
Muscular System Module 6: Cardiac Muscle Tissue
... blood into the vessels of the circulatory system. Similar to skeletal muscle, cardiac muscle is striated and organized into sarcomeres, possessing the same banding organization as skeletal muscle (Figure 1 (Cardiac Muscle Tissue )). However, cardiac muscle bers are shorter than skeletal muscle ber ...
... blood into the vessels of the circulatory system. Similar to skeletal muscle, cardiac muscle is striated and organized into sarcomeres, possessing the same banding organization as skeletal muscle (Figure 1 (Cardiac Muscle Tissue )). However, cardiac muscle bers are shorter than skeletal muscle ber ...
Electrocardiography
Electrocardiography (ECG or EKG*) is the process of recording the electrical activity of the heart over a period of time using electrodes placed on a patient's body. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscle depolarizing during each heartbeat.In a conventional 12 lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles (""leads"") and is recorded over a period of time (usually 10 seconds). In this way, the overall magnitude and direction of the heart's electrical depolarization is captured at each moment throughout the cardiac cycle. The graph of voltage versus time produced by this noninvasive medical procedure is referred to as an electrocardiogram (abbreviated ECG or EKG).During each heartbeat, a healthy heart will have an orderly progression of depolarization that starts with pacemaker cells in the sinoatrial node, spreads out through the atrium, passes through the atrioventricular node down into the bundle of His and into the Purkinje fibers spreading down and to the left throughout the ventricles. This orderly pattern of depolarization gives rise to the characteristic ECG tracing. To the trained clinician, an ECG conveys a large amount of information about the structure of the heart and the function of its electrical conduction system. Among other things, an ECG can be used to measure the rate and rhythm of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart's muscle cells or conduction system, the effects of cardiac drugs, and the function of implanted pacemakers.