Foundations
Medical studentsWhy blood pressure is not flow, and the three levers that set stroke volume.
- 1Flow is not pressure
- 2Preload, afterload, contractility
- 3Frank–Starling in one picture
- 4Indexing to body size
Free hemodynamics education
Hemodynamics, made visible.
Learn to read cardiac output, stroke volume and vascular resistance, and to act on them at the bedside. A live simulator and interactive teaching cases today, short video lessons soon, with a clinician who works with these numbers every day.
Learning paths
Start where you are. Finish confident at the bedside.
Five tracks of four short lessons. Pick the one that matches your work.
Shock states
ResidentsTell the four kinds of shock apart from their hemodynamic fingerprint.
- 1Hypovolemic
- 2Distributive and septic
- 3Cardiogenic
- 4Reading the pattern
Fluid responsiveness
ICU and emergencyGive fluid to those who will respond, and stop before it harms.
- 1Who will respond?
- 2Passive leg raise
- 3Stroke volume variation
- 4When to stop
Paediatric and neonatal
Paediatric and neonatal teamsChildren are not small adults: their own numbers, their own shock.
- 1Not small adults
- 2Indexed normal values
- 3Septic shock in children
- 4The preterm circulation
Non-invasive monitoring
Anaesthesia and ICUFrom four skin sensors to a number you can trust, and when not to.
- 1How Electrical Cardiometry works
- 2Placing the four sensors
- 3Reading the screen
- 4Trusting the trend
Video lessons coming soon Each lesson is being recorded with Dr. Nassef. Until then, every track links to something you can practise today.
Live simulator
Move the levers. Watch the circulation answer.
Change heart rate, preload, contractility and resistance, and see stroke volume, cardiac output and blood pressure respond on the Frank–Starling curve. Load a septic, hypovolemic or cardiogenic patient and try to fix them.
ECG
dZ/dt
HR bpm78
SV mL71
CO L/min5.5
SVR1080
Illustrative monitor: sample numbers, not a live patient.
Interactive cases
Decide first. Then see what the numbers do.
Each case gives you a patient, the hemodynamic profile and one decision. Choose, get the reasoning, and keep the teaching point.
Fever, confusion and a low blood pressure
High output, low resistance. Fluid, vasopressor or inotrope first?
Breathless, with a wet chest
Low output, high resistance, high thoracic fluid. What helps the heart?
A 28-week preterm on day two
Is the circulation coping? What the trend tells you that blood pressure can't.
The technology
From four skin sensors to a stroke volume
Electrical Cardiometry™ follows the blood in the aorta beat by beat, without a catheter. Here is the idea in four steps.
A tiny current
Four sensors on the neck and left chest send a safe, high-frequency current and measure how easily it passes.
Cells line up
Between beats, red cells in the aorta lie randomly. When the valve opens, they align with the flow and conductivity rises.
Speed of change
How fast that change happens gives the peak acceleration of aortic blood and the ejection time.
Stroke volume
From those, Osypka's patented algorithm estimates stroke volume and output; the same signal gives indices of contractility.
Your educator
Dr. Yasser Nassef
A physician and researcher (MD, PhD) at the Institute of Medicine, Chung Shan Medical University in Taiwan, who has spent his career making the circulation visible. He trains clinicians across Asia and the Middle East to monitor hemodynamics non-invasively and to act on what they see, and publishes on non-invasive monitoring in septic shock, hypertension and COPD.