The document describes the cardiac cycle, which consists of atrial systole, isovolumetric contraction, rapid ejection, reduced ejection, isovolumetric relaxation, rapid ventricular filling, and reduced ventricular filling. During atrial systole, the atria contract and push a small amount of additional blood into the ventricles. Isovolumetric contraction occurs as the ventricles contract but their volume does not change. Rapid ejection follows as the semilunar valves open and blood is rapidly pumped out. During reduced ejection, blood ejects more slowly until pressure in the ventricles falls below arterial pressure. Isovolumetric relaxation happens as the ventricles relax but their volume does not change. Then
This presentation describes the normal cardiac cycle referred to pressure-time curves for aorta, the left ventricle and left atrium, the electrocardiogram and the phonocardiogram.
This presentation describes the normal cardiac cycle referred to pressure-time curves for aorta, the left ventricle and left atrium, the electrocardiogram and the phonocardiogram.
Describe events in cardiac cycle.
Describe atrial, ventricular and aortic pressure changes during cardiac cycle.
Describe the changes in ventricular volume & stroke volume during cardiac cycle.
Relate ECG changes to the phases of cardiac cycle.
Describe the functions of cardiac valves and relate their state to the production of heart sounds during cardiac cycle.
med_students0
This presentation is an overview of the description of the 4 stages of the cardiac cycle (atrial diastole, atrial systole, ventricular systole, ventricular diastole) as well as explaining the mechanism of the cardiac cycle.
Describe events in cardiac cycle.
Describe atrial, ventricular and aortic pressure changes during cardiac cycle.
Describe the changes in ventricular volume & stroke volume during cardiac cycle.
Relate ECG changes to the phases of cardiac cycle.
Describe the functions of cardiac valves and relate their state to the production of heart sounds during cardiac cycle.
med_students0
This presentation is an overview of the description of the 4 stages of the cardiac cycle (atrial diastole, atrial systole, ventricular systole, ventricular diastole) as well as explaining the mechanism of the cardiac cycle.
Def: The cardiac events that occur from
beginning of one heart beat to the beginning of
the next.
■ first assembled by Lewis in 1920 but first
conceived by Wiggers in 1915 Atria act as PRIMER PUMPS for
ventricles & ventricles provide major
source of power for moving the blood
through the vascular system.
■ Initiated by spontaneous generation of
AP in SA node (located in the superior lateral wall of
the right atrium near the opening of the superior vena cava)
CARDIAC CYCLE, ECG AND HEART SOUNDS.pptxthiru murugan
CARDIAC CYCLE, ECG AND HEART SOUNDS: BY Wincy Thirumurugan..
“Cardiac cycle refers to the series of events that take place when the heart beats.”
Each cycle is initiated by spontaneous contraction in the SA node and then transmit through the A-V bundle and branches into the ventricles results completion of one cycle.
EVENTS OR PHASES OF CARDIAC CYCLE: Diastolic phase (Diastole) in this phase the heart chamber are in the state of relaxation and fills with blood that receives from the veins [IVC, SVC,PULMONARY VEINS]
Systolic phase (Systole) in this the heart chambers are contracting and pumps the blood towards the periphery via the arteries. [ Pulmonary artery and aorta]
PHASES OF THE CARDIAC CYCLE
The different phases of the cardiac cycle involve:
Atrial diastole - Atrial relaxation
Atrial systole -Atrial contraction
Isovolumic relaxation -ventricular relaxation in the early phase but blood will not move and the Atrio ventricular valves will be closed
Ventricular filling - ventricular relaxation, the Atrio ventricular valves will be open allows filling blood in the ventricles
Isovolumic contraction of ventricle – ventricular systole in the early phase but no movement of the blood. The semilunar valves will be closed.
Ventricular ejection -ventricular contraction and send blood out of the ventricles through opened semilunar valves.
6. Ventricular Filling Stage: second phase. Rapid Filling, Slow Filling & Last Rapid Filling Duration of Cardiac Cycle:
In a normal person, a heartbeat is 72 beats/minute.
An Electrocardiogram (ECG) is a medical test that detects cardiac (heart) abnormalities by measuring the electrical activity generated by the heart as it. The machine that records the patient’s ECG is called an electrocardiograph.
contracts.
PLACEMENT OF ECG LEADS
ECG WAVES:
The P wave is caused by spread of depolarization through the atria, After the onset of the P wave, The QRS waves Occurs as a result of electrical depolarization of the ventricles, the ventricular T wave represents the stage of repolarization of the ventricles, The 'U' wave is a wave comes after the T wave of ventricular repolarization and may not always be observed.
HEART SOUNDS: First Heart Sound (S1)
The first heart sound results from the closing of the mitral and tricuspid valves. Second Heart Sound (S2): The second heart sound is produced by the closure of the aortic and pulmonic valves. Third Heart Sound (S3):
The third heart sound, also known as the “ventricular gallop,” occurs just after S2 when the mitral valve opens, allowing passive filling of the left ventricle. The S3 sound is actually produced by the large amount of blood striking a very compliant LV.
[Compliance heart means how easily the chamber of heart or the lumen of blood vessels expands when it is filling with the blood]
Fourth Heart Sound (S4):
The fourth heart sound, also known as the “atrial gallop,” occurs just before S1 when the atria contract to force blood into the LV.
CARDIAC CYCLE-The cardiac cycle is the performance of the human heart from th...zaaprotta
The cardiac cycle refers to all of the events that occur from the beginning of one heartbeat to the beginning of the next and can be divided into two parts: a period of relaxation known as diastole and a period of contraction known as systole.
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Basavarajeeyam is an important text for ayurvedic physician belonging to andhra pradehs. It is a popular compendium in various parts of our country as well as in andhra pradesh. The content of the text was presented in sanskrit and telugu language (Bilingual). One of the most famous book in ayurvedic pharmaceutics and therapeutics. This book contains 25 chapters called as prakaranas. Many rasaoushadis were explained, pioneer of dhatu druti, nadi pareeksha, mutra pareeksha etc. Belongs to the period of 15-16 century. New diseases like upadamsha, phiranga rogas are explained.
Basavarajeeyam is a Sreshta Sangraha grantha (Compiled book ), written by Neelkanta kotturu Basavaraja Virachita. It contains 25 Prakaranas, First 24 Chapters related to Rogas& 25th to Rasadravyas.
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
Adv. biopharm. APPLICATION OF PHARMACOKINETICS : TARGETED DRUG DELIVERY SYSTEMSAkankshaAshtankar
MIP 201T & MPH 202T
ADVANCED BIOPHARMACEUTICS & PHARMACOKINETICS : UNIT 5
APPLICATION OF PHARMACOKINETICS : TARGETED DRUG DELIVERY SYSTEMS By - AKANKSHA ASHTANKAR
Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
3. ATRIAL SYSTOLE - Heart
Prior to atrial systole, blood has
been flowing passively from the
atrium into the ventricle through
the open AV valve.
During atrial systole the atrium
contracts and tops off the volume
in the ventricle with only a small
amount of blood. Atrial contraction
is complete before the ventricle
begins to contract.
4. ATRIAL SYSTOLE
Pressures & Volumes
The "a" wave occurs when the
atrium contracts, increasing atrial
pressure (yellow).
Blood arriving at the heart cannot
enter the atrium so it flows back
up the jugular vein, causing the
first discernible wave in the
jugular venous pulse.
Atrial pressure drops when the
atria stop contracting.
During atrial systole the atrium
contracts and tops off the volume
in the ventricle with only a small
amount of blood.
Atrial contraction is complete
before the ventricle begins to
contract.
5. ATRIAL SYSTOLE
ECG
An impulse arising from the SA node results in depolarization and
contraction of the atria (the right atrium contracts slightly before the
left atrium).
The P wave is due to this atrial depolarization.
The PR segment is electrically quiet as the depolarization proceeds
to the AV node.
This brief pause before contraction allows the ventricles to fill
completely with blood.
6. ATRIAL SYSTOLE
Heart Sounds
A fourth heart sound (S4) is abnormal and is associated with the end
of atrial emptying after atrial contraction.
It occurs with hypertrophic congestive heart failure, massive
pulmonary embolism, tricuspid incompetence, or cor pulmonale.
8. ISOVOLUMETRIC CONTRACTION
Heart
The atrioventricular (AV) valves
close at the beginning of this
phase.
Electrically, ventricular systole is
defined as the interval between
the QRS complex and the end of
the T wave (the Q-T interval).
Mechanically, ventricular systole
is defined as the interval between
the closing of the AV valves and
the opening of the semilunar
valves (aortic and pulmonary
valves).
9. ISOVOLUMETRIC CONTRACTION
Pressures & Volumes
The AV valves close when the
pressure in the ventricles (red)
exceeds the pressure in the atria
(yellow).
As the ventricles contract
isovolumetrically -- their volume
does not change (white) -- the
pressure inside increases,
approaching the pressure in the
aorta and pulmonary arteries
(green).
10. ISOVOLUMETRIC CONTRACTION
ECG
The electrical impulse propagates from the AV node through the His
bundle and Purkinje system to allow the ventricles to contract from
the apex of the heart towards the base.
The QRS complex is due to ventricular depolarization, and it marks
the beginning of ventricular systole. It is so large that it masks the
underlying atrial repolarization signal. the ventricles to fill completely
with blood.
14. RAPID EJECTION
Pressures & Volumes
While the ventricles continue
contracting, the pressure in the
ventricles (red) exceeds the pressure
in the aorta and pulmonary arteries
(green); the semilunar valves open,
blood exits the ventricles, and the
volume in the ventricles decreases
rapidly (white).
As more blood enters the arteries,
pressure there builds until the flow of
blood reaches a peak.
The "c" wave of atrial pressure is not
normally discernible in the jugular
venous pulse. Right ventricular
contraction pushes the tricuspid valve
into the atrium and increases atrial
pressure, creating a small wave into
the jugular vein. It is normally
simultaneous with the carotid pulse.
19. REDUCED EJECTION
Pressures & Volumes
After the peak in ventricular and
arterial pressures (red and
green), blood flow out of the
ventricles decreases and
ventricular volume decreases
more slowly (white).
When the pressure in the
ventricles falls below the pressure
in the arteries, blood in the
arteries begins to flow back
toward the ventricles and causes
the semilunar valves to close.
This marks the end of ventricular
systole mechanically.
20. REDUCED EJECTION
ECG
The T wave is due to ventricular repolarization. The end of the T
wave marks the end of ventricular systole electrically.
24. ISOVOLUMETRIC RELAXATION
Pressures & Volumes
Throughout this and the previous
two phases, the atrium in diastole
has been filling with blood on top
of the closed AV valve, causing
atrial pressure to rise gradually
(yellow).
The "v" wave is due to the back
flow of blood after it hits the
closed AV valve. It is the second
discernible wave of the jugular
venous pulse.
The pressure in the ventricles
(red) continues to drop.
Ventricular volume (white) is at a
minimum and is ready to be filled
again with blood.
26. ISOVOLUMETRIC RELAXATION
Heart Sounds
The second heart sound (S2, "dup") occurs when the semilunar
(aortic and pulmonary) valves close. S2 is normally split
because the aortic valve closes slightly earlier than the
pulmonary valve.
31. RAPID VENTRICULAR FILLING
Heart Sounds
A third heart sound (S3) is usually abnormal and is due to rapid
passive ventricular filling. It occurs in dilated congestive heart
failure, severe hypertension, myocardial infarction, or mitral
incompetence.
34. REDUCED VENTRICULAR FILLING
Pressures & Volumes
Ventricular volume (white)
increases more slowly now. The
ventricles continue to fill with
blood until they are nearly full.