Cardiac Cycle |Duration | Physiology & Wigger Diagram
-
Dr.
Arpita Biswas
- Dr.Rahul Kr. Jha
- Disclaimer
Table of Contents
Cardiac cycleΒ
The Heart cycle is defined as the sequence of coordinatedΒ phases taking place in the heart during each beat.Β The heart cycle is also denoted as the Cardiac cycle. Each heart beat consists of two major periods called systole( contraction) and diastole ( relaxation).
During systole
Β During the cardiac cycle, the heart contracts and pumps the blood to arteries is called the systolic phase.
During diastole
The heart relaxes and blood is filled in another part of the heart is called the diastole phase of the heart cycle.
Phases taking place in the heart cycle
1. Filling of Atrium
The filling of the atrium is the step of the Cardiac cycle and due to the blood pressure in the atrium, the valve ( both tricuspid and bicuspid ) opens passively, leading to the ventricle’s passive filling.
2. Atrial systole
For 0.1 sec the atrial contraction takes place called atrial systole.
3. Atrial diastole
This is the phase of the Cardiac cycle where the atrium relaxes and blood goes to the ventricles which isΒ the active filling of the ventricles.
4. Ventricle systole
The tricuspid and bicuspid valves close leading to ventricular contraction. The pressure exerted on the semilunar valve leads to the opening of them.
5. Ventricular diastole
The relaxation of ventricles is 0.5 sec and the transfer of blood to major vessels of the heart. The ventricles never push all the blood to the aorta and pulmonary artery . Simultaneously itΒ start filling the atrium.
Grade 0 (Zero) Muscle
The Grade 0 (Zero) muscle is completely quiescent on palpation or visual inspection.
Plus (+) and Minus (-) Grades
Use of a plus (+) or minus (-) addition to a manual muscle test grade is discouraged except in three instances: Fair+, Poor+, and Poor-.
Grade 3+ (Fair+) Muscle
The Grade 3+ muscle can complete a full range of motion against gravity, and the patient can hold the end position against mild resistance.
For example, a patient with weak wrist extensors at Grade 3 cannot use a wrist-hand orthosis (WHO ) effectively, but a patient with a Grade 3+ muscle can use such a device. Likewise, patient with only Grade 3 ankle dorsiflexion cannot use a shoe-insert type of ankle-foot orthosis functionally. The patient with Grade 3+ dorsiflexion can tolerate the added weight of the brace, which is comparable to the mild resistance used in the test.
Β
Grade 2+ (Poor+) Muscle
The 2+ Grade is clearly distinguished from Grade 2, which indicates that the full range is completed with no resistance.
Grade 2 – (Poor- ) Muscle
The Grade 2- (Poor-) muscle can complete a partial range of motion in the horizontal plane, the gravity-minimized position.
For example, a patient with infectious neuronitis (Landry-Guillain-Barre syndrome) who moves from muscle Grade 1 to Grade 2– demonstrates a quantum leap forward in terms of recovery and prognosis.
What is the available Range of Motion?
When any condition limits the joint range of motion, the patient can perform only within the range available.
In this circumstance, the available range is the full range of motion (ROM) for that patient at that time, even though it is not “normal.” This is the range used to assign a muscle testing grade. For example, the normal knee extension range is 135 Β° to 0Β° . A patient with a 20 Β° knee flexion contracture is tested for knee extension strength.
This patient’s maximal range into extension is -20Β°. If this range (in sitting) can be completed with maximal resistance, the grade assigned would be a 5 (Normal). If patient cannot complete that range, the grade assigned MUST be less than 3 (Fair). The patient then should be repositioned in the side-lying position to ascertain the correct grade.
SUBSCRIBE
subscribe to our newsletter and stay updated
X-ray
X-Ray Imaging Table of Contents X-ray imaging is a diagnostic medical procedure used in various clinical conditions such as fracture,.......
Wrist Complex
Wrist Complex Table of Contents Introduction The wrist joint consists of two compound joints : the radiocarpal and the midcarpal.......
Whirl Pool Bath
Whirl Pool Bath Table of Contents The principal of whirlpool bath therapy is to combine effects of temp with mechanical.......
What should we eat during periods to reduce pain?
Home During period, the right food choices can make a huge difference in how your body feels. Warm, comforting drinks.......
What is pain scale & how it works
What is pain scale & how it works ? What is a Pain scale? A pain scale is a tool.......
what is intermittent fasting ?
Home Table of Contents Intermittent fasting (IF) is an eating pattern cycle between periods of fasting and eating. People often.......