🫀 Ischaemic Heart Disease: From Endothelium to Infarction

Ischaemic heart disease (IHD), also referred to as coronary artery disease (CAD), describes a state in which myocardial oxygen supply is insufficient to meet myocardial metabolic demand.

At face value, that is a simple supply–demand mismatch. In reality, it reflects a complex, progressive, inflammatory disease of the coronary arteries that evolves over decades before becoming clinically apparent.

The heart extracts a very high proportion of oxygen from coronary blood at rest. Unlike skeletal muscle, it cannot simply extract much more when demand rises. When the myocardium needs more oxygen — during exercise, stress, tachycardia — the only way to meet that demand is to increase coronary blood flow.

Anything that limits the ability of coronary arteries to increase flow becomes clinically important.

To understand IHD properly, we need to follow the biology.

 

Electrophysiology of the Heart ✨🧠

The heart isn’t just a pump — it’s a beautifully coordinated electrical organ. 
Every beat begins with ions moving across membranes in a precisely coordinated sequence.

If you understand the ions, you understand the ECG.
If you understand the ECG, you understand arrhythmias.

Let’s build it from the ground up.

Understanding the Cardiovascular System: Structure, Function, and Clinical Relevance 🫀

As medical students, mastering the cardiovascular system is essential—not just for exams, but for your future clinical practice. Let’s break down the heart’s anatomy, physiology, and key concepts in a structured, detailed way to help you build a strong foundation. Ready to dive in? 

Principles of Managing Dehydration 💧

Dehydration is a common but potentially serious clinical condition that reflects a failure of the body to maintain fluid and electrolyte balance — a core example of disrupted homeostasis.

Even small fluid deficits can impair circulation, organ perfusion, and cellular function, particularly in infants, older adults, and unwell patients.

Dehydration: More Than Just Feeling Thirsty 💧

Water is essential for life, and maintaining fluid balance is a core component of homeostasis. The body works continuously to keep its internal environment stable, but illness, exertion, heat exposure, or inadequate intake can quickly disrupt this balance.

Dehydration exists on a spectrum — from mild physiological stress to life-threatening hypovolaemic shock — with progressively worsening signs and symptoms as circulating volume falls.

🩺 Anatomical terminology: the shared language of medicine🔬

No matter where you are up to in your training, anatomical terminology is the foundation of precise communication in medicine.

Instead of saying “towards the head” or “away from the body”, clinicians use standardised terms that mean the same thing to everyone — in any hospital, clinic, or country.

This shared language eliminates ambiguity and reduces the risk of miscommunication.

Understanding Vital Signs: A Clinical Perspective

 Vital signs provide immediate, objective insights into a patient’s physiological status and are often the earliest indicators of deterioration or underlying pathology. As healthcare professionals, accurate measurement and interpretation of these parameters is essential for guiding assessment and clinical decision-making.

Homeostasis: Keeping the Internal Environment stable

 

Underneath every diagnosis is a simple, powerful question:
What has disrupted the body’s ability to maintain balance?
That balance is called homeostasis.

Laptop or pen and paper? Whiteboards and mind maps? The science behind effective learning

 Have you ever found yourself staring at neatly typed lecture notes, wondering why the information doesn’t seem to stick? You were there, you took notes diligently—so why isn’t your recall better? Are you just a bad student?

The answer lies in how your brain processes and encodes new material. Note-taking isn’t just about capturing information—it’s about engaging with it in ways that enhance understanding and memory. The method you use matters more than you might think.

Let’s explore the science behind different note-taking strategies and active learning techniques that can help strengthen retention, improve comprehension, and boost recall.

What is a Cell? The Foundation of Life

Cells are the fundamental units of life, forming the structural and functional basis of all living organisms. In the human body, they are highly specialised, working collectively to maintain homeostasis, metabolism, communication, and survival.

When cells are exposed to physiological stress — such as dehydration, heat, or reduced oxygen availability — their ability to maintain normal function can be compromised. Understanding how cells are structured and how they function provides a foundation for understanding disease, and for the physiology, pathology, and pharmacology you will encounter throughout the course.

Each cell contains key organelles, each with distinct roles essential for function and coordination.