The UK's National Lead for Structural Heart Intervention - Now Practicing in London

Many patients in the early stages of aortic stenosis misinterpret their symptoms as a normal part of ageing. As a result, breathlessness, fatigue, reduced stamina, or slower recovery after activity are often overlooked, delaying recognition of a progressive cardiac condition that requires medical attention. This rationalisation is reinforced by gradual symptom onset and the absence of early pain, often leading individuals to adapt their lifestyles rather than seek assessment. As a result, medical review is frequently delayed, allowing the disease to advance silently until symptoms become more disruptive, persistent, and clinically significant. By the time a diagnosis is made, intervention is often more urgent and complex, carrying higher health risks, fewer treatment options, and less flexibility in selecting the most appropriate therapeutic approach.

The biology: the narrowing of the aortic gateway

The aortic valve acts as the heart’s primary gateway, allowing oxygenated blood to pass from the left ventricle into the aorta and onwards to the rest of the body. In a healthy heart, this valve consists of three thin, flexible leaflets that open fully with each heartbeat and close securely to prevent backflow. With aortic stenosis, these leaflets gradually become thickened, stiffened, and calcified, losing their ability to open freely and efficiently during systole, thereby disrupting normal blood flow dynamics.

Age-related calcium deposition is the most common cause, although congenital valve abnormalities and previous inflammatory conditions can also contribute. As calcification progresses, the effective valve opening becomes smaller, increasing resistance to blood flow leaving the heart. This narrowing forces the left ventricle to work harder to maintain adequate circulation, placing sustained strain on the cardiac muscle over time and accelerating structural changes that compromise performance.

As the valve narrows further, the left ventricle must generate significantly higher pressure to eject blood through the restricted opening. This chronic pressure overload causes the muscular wall of the ventricle to thicken, a process known as left ventricular hypertrophy. While initially compensatory, this thickening reduces ventricular compliance, increases oxygen demand, and eventually compromises filling and pumping efficiency, setting the stage for symptomatic disease, heart failure, and poorer long-term prognosis without timely intervention.

Strategy 1: identifying the “SAD” triad of symptoms

Clinical recognition of aortic stenosis often relies on awareness of the classic symptom cluster known as the “SAD” triad (syncope, angina, and dyspnoea). These symptoms typically emerge as the condition progresses from moderate to severe, indicating that the obstruction has reached a level where the heart can no longer compensate effectively during physical or physiological stress, particularly during exertion or periods of increased demand.

Syncope refers to episodes of fainting or near-fainting, most commonly occurring during exertion or sudden changes in posture. Physical activity increases the body’s demand for blood flow, yet the narrowed valve restricts the heart’s ability to respond appropriately. This mismatch can result in a temporary reduction in blood supply to the brain, causing dizziness, light-headedness, or loss of consciousness, which should always prompt urgent clinical evaluation and specialist assessment.

Angina, or chest pain, occurs when the thickened heart muscle requires more oxygen than the coronary circulation can supply. Even in patients without coronary artery disease, the increased workload and reduced perfusion reserve of the hypertrophied ventricle can lead to chest discomfort. This pain is often exertional, pressure-like in nature, and may resolve with rest as myocardial demand decreases, potentially masking its cardiac origin.

Dyspnoea, defined as shortness of breath on exertion, reflects rising pressures within the heart and lungs. Impaired ventricular filling leads to increased pressure in the left atrium and pulmonary circulation, causing fluid congestion. Over time, activities such as walking uphill, climbing stairs, or carrying groceries become increasingly difficult, reducing independence, exercise tolerance, and overall functional capacity in daily life.

Strategy 2: the Significance of the heart murmur

A heart murmur is frequently the earliest objective sign of aortic stenosis and is often detected during routine clinical examination. General practitioners play a pivotal role in early identification, as careful auscultation can prompt timely referral for further investigation before symptoms become advanced or complications such as heart failure, arrhythmias, or sudden deterioration develop. The characteristic murmur associated with aortic stenosis is described as an ejection systolic murmur. It is generated by turbulent blood flow as blood is forced through the narrowed valve during ventricular contraction. Typically heard best at the upper right sternal edge, the sound may radiate to the carotid arteries in the neck, reflecting altered haemodynamics within the aorta and reduced valve opening.

While the loudness of the murmur does not always correlate with disease severity, its presence is clinically significant, particularly when accompanied by exertional symptoms or risk factors such as advanced age. The murmur serves as an audible marker of altered valve function and highlights the importance of regular cardiovascular examinations as part of routine preventive healthcare and ongoing patient monitoring.

Strategy 3: moving from diagnosis to treatment

Once aortic stenosis is suspected, echocardiography is the definitive diagnostic investigation. This non-invasive ultrasound assessment provides detailed visualisation of valve anatomy, leaflet mobility, and blood flow patterns. By measuring pressure gradients across the valve and calculating the valve area, clinicians can accurately classify disease severity and determine the appropriate timing of intervention, ensuring treatment is neither delayed nor premature. 

Echocardiography also evaluates left ventricular size, wall thickness, and systolic function, offering insight into the heart’s adaptive response to chronic pressure overload. These findings help guide clinical decision-making, particularly in determining whether symptoms are attributable to valve disease and whether intervention is likely to improve survival, functional capacity, and long-term quality of life.

Historically, surgical aortic valve replacement through open-chest surgery was the standard treatment for severe symptomatic disease. Although effective, it carries a higher procedural risk and prolonged recovery for some patients. The advent of transcatheter aortic valve implantation, or TAVI, has revolutionised management by allowing valve replacement via a catheter-based approach, avoiding sternotomy and enabling faster recovery with fewer complications and reduced hospital stays.

Quality of life post-treatment

Following successful valve replacement, most patients experience a significant and sustained improvement in quality of life. Relief from breathlessness and chest discomfort often occurs within weeks, allowing individuals to resume activities that had previously been limited or avoided due to symptoms, fear, or physical exhaustion and declining confidence, while regaining a greater sense of control over their daily routines and physical capabilities. Physical activities such as walking, gardening, and light exercise typically become easier as cardiac output improves and pulmonary congestion resolves. Many patients also report better functional outcomes, sleep quality, improved mood, and increased confidence in their physical abilities, contributing to overall well-being, independence, and renewed social engagement.

Shortness of breath should not be dismissed as a normal part of getting older. It can be an early warning sign of aortic valve disease, where delayed diagnosis may lead to serious complications. Ongoing follow-up is essential to monitor valve function, manage comorbid conditions, and optimise long-term outcomes. Cardiac rehabilitation and clear lifestyle guidance play an important role in supporting recovery and maintaining functional capacity. Timely treatment of aortic stenosis not only improves symptoms but also significantly enhances survival, highlighting the need for early assessment, accurate diagnosis, and patient-centred intervention supported by continuous clinical oversight. Book a valve assessment today to identify potential valve disease early, before symptoms progress.

A sudden, forceful thump in the chest that breaks the silence of the night can be deeply unsettling, often prompting an immediate fear that something is seriously wrong with the heart. Heart palpitations are one of the most common reasons people seek urgent medical reassurance, yet they sit within a complex overlap between normal cardiac physiology, heightened bodily awareness, and anxiety-driven responses. While some palpitations are entirely benign and transient, others may signal an underlying rhythm disturbance that warrants further evaluation. The challenge lies in distinguishing between sensations amplified by stress and those arising from genuine electrical irregularities within the heart. Understanding how and why palpitations occur is therefore critical, not only to reduce unnecessary fear but also to ensure that potentially significant cardiac conditions are identified early and managed appropriately.

The biology: your heart’s electrical conduction system

The heart functions through a structured electrical conduction system that maintains a stable rhythm across varying physical and emotional demands. The sinus node, located in the right atrium, acts as the natural pacemaker by generating regular electrical impulses. These impulses travel across the atria, pass through the atrioventricular node, and continue along the His-Purkinje network to the ventricles, resulting in a coordinated and efficient heartbeat. This system is dynamically regulated by the autonomic nervous system to match the body’s needs. Parasympathetic input slows the heart rate during rest, while sympathetic stimulation increases it during physical activity or emotional stress. These adjustments allow rapid adaptation to changes in posture, oxygen demand, and external stressors without compromising cardiac efficiency.

Palpitations occur when normal electrical timing is altered or becomes more noticeable. Ectopic beats, which are extra electrical impulses, are common and often harmless but can create the sensation of a skipped or forceful beat. Anxiety amplifies these sensations by activating the sympathetic nervous system, increasing adrenaline release and heightening awareness of cardiac activity, making benign rhythm changes feel more pronounced.

Strategy 1: deciphering the sensation

Understanding how a palpitation feels provides useful clues about its origin and potential significance. Duration, onset, frequency, and associated symptoms such as breathlessness, dizziness, or chest discomfort refine interpretation and support appropriate triage decisions clinically. Sensation alone cannot diagnose a rhythm disorder, but it helps to differentiate between common benign patterns and those that require further attention through structured clinical assessment and monitoring.

Ectopic beats (PVCs/PACs)

Premature ventricular contractions and premature atrial contractions are among the most frequent causes of palpitations encountered in clinical practice. They are often described as a skipped beat, a brief pause, or a sudden flopping sensation in the chest. The compensatory pause that follows the extra beat allows the heart to fill more fully, making the next contraction feel forceful. In the absence of structural heart disease, these ectopic beats are usually harmless, despite how dramatic or recurrent they may feel to patients.

Tachycardia

 A racing heart creates a distinctly different experience that is often more sustained and noticeable. Sinus tachycardia refers to a fast but regular rhythm driven by the sinus node, commonly associated with anxiety, physical exertion, dehydration, pain, or infection. Supraventricular tachycardia originates from abnormal electrical circuits above the ventricles and is characterised by sudden onset and termination. Patients may notice pounding in the neck, light-headedness, or a sense of internal vibration, reflecting rapid atrial contraction and altered blood flow perception internally.

Atrial fibrillation

Atrial fibrillation produces an “irregularly irregular” rhythm, with no predictable pattern between beats and variable pulse strength. Chaotic electrical activity in the atria replaces organised contraction, leading to inconsistent ventricular responses and reduced cardiac efficiency. This matters because it can impair blood flow and promote clot formation within the atria, increasing the risk of stroke and heart failure. Risk assessment considers age, symptoms, and comorbidities to guide decisions around anticoagulation and long-term rhythm or rate control. Early identification improves outcomes and significantly reduces preventable complications overall.

Strategy 2: identifying external triggers (zeitgebers)

Palpitations are frequently influenced by external and internal timing cues that shape physiological rhythms. Identifying these triggers can significantly reduce symptom burden and restore a sense of control for patients. Keeping a simple symptom diary linking activities, intake, and emotional state can reveal patterns that are not immediately obvious and support targeted intervention strategies.

The vicious cycle of anxiety and palpitations

Psychological interpretation plays a central role. An initial palpitation may trigger concern, which heightens vigilance towards the heartbeat. Catastrophic thinking intensifies physiological arousal, making further palpitations more likely. Education about benign rhythms can interrupt this cycle by reframing sensations as uncomfortable but not harmful. This cognitive shift reduces hypervigilance and supports more effective use of relaxation and coping strategies in daily life contexts.

Chemical triggers

Several commonly used substances alter cardiac excitability, often in combination with psychological stressors. Caffeine increases catecholamine release and shortens electrical refractory periods, encouraging ectopic activity. Nicotine stimulates the heart and raises blood pressure, while alcohol can destabilise atrial electrical conduction. Certain over-the-counter medications contain decongestants that act as stimulants and can provoke palpitations in sensitive individuals. Reading labels and seeking professional advice helps to minimise avoidable triggers effectively overall safely.

Strategy 3: The red flags checklist

Context matters when assessing risk. Age, existing medical conditions, and medication use all influence how palpitations should be interpreted. Syncope or near-syncope suggests transient reductions in cerebral blood flow and warrants urgent assessment. Even a brief loss of consciousness during palpitations should be treated as clinically significant and promptly investigated medically. Chest pain may indicate myocardial ischaemia, while exertion-linked rhythm changes suggest compromised cardiac reserve. A family history of sudden cardiac death or cardiomyopathy further increases risk and should not be overlooked. These contextual factors guide urgency and referral pathways appropriately in practice.

Strategy 4: The diagnostic toolkit

Diagnosis is a process rather than a single test, combining clinical history, physical examination, and targeted investigations to build a coherent picture of cardiac rhythm behaviour over time. Careful symptom correlation, risk assessment, and contextual interpretation are essential components of this process. This structured approach reduces unnecessary testing while ensuring serious conditions are not missed or underestimated clinically, particularly in patients with intermittent, stress-related, or activity-linked symptoms where timing is critical.

12-lead ECG

 A standard twelve-lead electrocardiogram records the heart’s electrical activity from multiple anatomical angles, providing a comprehensive baseline assessment of rhythm, rate, and conduction. It also allows evaluation of heart rate variability, conduction intervals, axis deviation, and repolarisation patterns that may predispose to arrhythmia under physiological or emotional stress. These findings inform risk stratification, referral urgency, and follow-up planning decisions carefully and objectively within established clinical frameworks.

Holter monitoring                                                  

Intermittent symptoms often require extended monitoring to capture relevant rhythm disturbances as they occur in real life rather than controlled settings. Holter monitors record continuous cardiac rhythm over twenty-four to forty-eight hours, while longer-term event monitors can be worn for several weeks. Advances in wearable technology enable assessment during normal daily activities, sleep, and exertion, improving symptom correlation, diagnostic yield, and overall clinical accuracy significantly.

When lifestyle changes aren’t enough

 Management decisions balance symptom severity, objective findings, and patient preference, ensuring treatment aligns with both clinical need and long-term quality of life goals. Lifestyle modification remains the foundation of care, with regular aerobic exercise improving autonomic balance and structured breathing techniques reducing sympathetic surges. Consistency, rather than intensity, is key to sustained benefit. When symptoms persist or impair daily functioning, beta-blockers may reduce adrenergic sensitivity, while other pharmacological or interventional therapies are considered selectively. In some cases, clear reassurance alone restores confidence and reduces symptom-focused anxiety.

If your heart rhythm feels wrong, uncertainty can be more distressing than the symptom itself, particularly when episodes recur without explanation, pattern, or identifiable triggers. Objective assessment replaces speculation with clarity, reassurance, and direction. If palpitations persist, evolve, or cause concern, do not leave it to guesswork or self-diagnosis. Book a consultation to ensure your heart health is guided by evidence rather than fear, allowing informed decisions and appropriate reassurance or treatment based on your individual risk profile, clinical findings, and symptoms.