To save content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about saving content to .
To save content items to your Kindle, first ensure no-reply@cambridge.org
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Neonates with ductal-dependent congenital heart disease (CHD) will receive a continuous infusion of a prostaglandin E1 analogue such as alprostadil prior to surgical correction. Alprostadil can cause apnoea, which may be mitigated in practice with the use of caffeine citrate. Caffeine citrate can lead to tachyarrhythmias, which could be detrimental in this patient population. The purpose of this study was to determine if the practice of utilising caffeine citrate in neonates with ductal-dependent CHD receiving continuous alprostadil infusions is safe. In this single-centre, retrospective, cohort study of neonates admitted to the congenital heart service from November 2017 to September 2024, patients were included if they had ductal-dependent CHD and a gestational age greater than or equal to 35 weeks. Neonates that received continuous infusion of alprostadil alone were compared to those that received alprostadil in addition to caffeine citrate. The primary outcome was the frequency of sustained tachycardia during treatment. Seventy-five patients were included for review in each cohort. The median number of incidences of sustained tachycardia per patient was 7 (interquartile range 1–20) in the alprostadil plus caffeine citrate group and 4 (interquartile range 0–18) in the alprostadil alone group (p = 0.293). Other arrhythmias during the treatment course were common and similar between each cohort. Utilising caffeine citrate was not associated with a statistically significant increased incidence of tachycardia in neonates with ductal-dependent CHD on alprostadil infusions at the University of Florida.
Neonatal ectopic atrial tachycardia is a rare arrhythmia that may be resistant to conventional therapy. We report a neonate with persistent foetal tachycardia refractory to flecainide and digoxin. Ivabradine resulted in rapid and sustained heart rate reduction without haemodynamic compromise. This case supports ivabradine as a therapeutic option in neonatal automatic tachycardias when standard treatments fail.
This chapter presents a case of an 89-year-old female with fever and altered mental status. The patient presents with systemic inflammatory response syndrome (SIRS) due to pneumonia. The case presents the medical interventions to mitigate progression to multiorgan dysfunction or septic shock.
The chapter describes a case of a 28-year-old female brought in by her boyfriend, who reports that the patient had a seizure. The patient is drowsy but arousable to painful stimuli and has vomitus on her clothes. The primary survey reveals dry and cool skin, normal capillary refill, and tachypnea. The patient is diagnosed with intentional tricyclic antidepressant (TCA) toxicity after admitting to taking a large number of pills. The critical actions include administering IV fluids, obtaining an EKG, alkalizing the serum, and managing TCA-induced seizures. The chapter provides pearls on the treatment of TCA toxicity, including the use of crystalloid fluids for hypotension and the greatest risk of seizures and arrhythmias occurring within the first 6−8 hours after ingestion.
This chapter presents a case of a 50-year-old male with community-acquired pneumonia triggering sudden worsening of underlying hyperthyroidism. The case highlights the identification of hyperthyroidism despite several vital sign changes that could be due to either his pneumonia or underlying hyperthyroidism, as well as medical intervention to treat hyperthyroidism without worsening the disease process.
William Fawcett, Royal Surrey County Hospital, Guildford and University of Surrey,Olivia Dow, Guy's and St Thomas' NHS Foundation Trust, London,Judith Dinsmore, St George's Hospital, London
Perioperative cardiac arrest occurs in about 1 in 3,000 anaesthetics. The majority occur in older, frailer patients (1 in 1,200), and in high-risk or emergency surgery. The cause may be the result of underlying medical disease – usually cardiac, secondary to surgery – usually due to haemorrhage or secondary to an anaesthetic cause – usually due to hypoxia and hypercapnia, typically resulting from airway problems.
The Resuscitation Council has issued algorithms to guide management of basic and advanced life support in both adults and children. Advanced life support secures the airway and supports the circulation using drugs with the aim of the return of spontaneous circulation. Two main types of arrhythmia occur in a cardiac arrest:
Non-shockable: pulseless electrical activity (PEA) – a QRS complex without a palpable pulse and asystole
Shockable: ventricular fibrillation (VF) or pulseless ventricular tachycardia (VT)
Potentially reversible causes of cardiac arrest should be actively sought and treated. There are special circumstances after 28 weeks of pregnancy which require attention and are described. A traumatic cardiac arrest resuscitation algorithm is discussed.
Sinus tachycardia due to hyperthyroidism is generally treated with beta-blockers. But some patients do not respond to beta-blockers or may have non-tolerable side effects or have contraindications. We presented a case with persistent sinus tachycardia secondary to hyperthyroidism refractory to maximal doses of propranolol. After ivabradine treatment, her heart rate was < 100 bpm within 24 hours. There were no electrocardiogram changes or side effects. The use of ivabradine is promising and can be considered in cases where tachycardia cannot be controlled in children with hyperthyroidism.
Congenital junctional ectopic tachycardia is a rare arrhythmia that occurs in patients without previous cardiac surgery. In this report, we wanted to present a 6-hour-old newborn with congenital junctional ectopic tachycardia resistant to conventional anti-arrhythmic medications, who was successfully treated with ivabradine and amiadarone combination.
Case:
A six-hour-old newborn girl was hospitalised in neonatal ICU because transient tachypnoea of the newborn. She was tachycardic, and supraventricular tachycardia was noticed. There was no answer to the adenosine esmolol treatment; even synchronised direct cardioversion intravenous amiodarone was started. Junctional ectopic tachycardia was diagnosed. We have added propranolol to the treatment and followed patient for 2 days. On the fourth day, junctional ectopic tachycardia rhythm still persisted; therefore, ivabradine treatment was added to the treatment. On the following day, the heart rhythm was slowed to 110/min, and propranolol was stopped; intravenous amiodarone treatment was changed to the oral form. The rhythm turned into sinus; two days after starting ivabradine and oral amiodarone.
Conclusion:
Tachyarrhythmia originating in the atrioventricular node and atrioventricular junction including the bundle of His complex are junctional ectopic tachycardia. Congenital junctional ectopic tachycardia is rare, and it is mostly resistant to the conventional treatment.
Ivabradine is a new anti-arrhythmic agent, used extensively to decrease sinus rate in the treatment of cardiac failure. Ivabradine may be an option for the resistant congenital ectopic tachycardia
The ECG is a non-invasive representation of the activity of the cardiac electrical conducting system. ECGs are widely available in all hospitals and therefore interpretation is of great importance. ECGs allow assessment of cardiac rate, recognition of conduction blocks, myocardial ischaemia, life-threatening arrhythmias, and the effects of drugs. Therefore ECGs provide a wealth of information allowing safe and appropriate treatment strategies for patients. This chapter summarises the most salient features of common arrhythmias seen in clinical practice.
This is a presentation of the FEP of a 23 y.o. patient. The patient had a Duration of Untreated Psychosis (DUP) of 6 months and Duration of Untreated Illness (DUI) of six years. The therapeutic response and the adverse effects of Paliperidone are being described.
Objectives
To investigate the tolerance of Paliperidone in a patient with FEP.
Methods
The patient was assessed regularly by the psychiatric team consisting of a CT doctor and one General Adult Consultant. Appropriate psychological assessments and investigations took place.
Results
Upon admission the patient appeared guarded. She also presented with weight loss and dehydration. Initial PANSS score was 173, positive subscale 41. The patient was initially treated with monotherapy 6mg of Paliperidone. However, the heart rate was around 100 bpm culminating as high as 156 bpm. The ECG indicated sinus tachycardia. The patient presented with serious EPSs and diarrhea. Simpson-Angus Scale score 10. Metoprolol 25mg was prescribed twice a day. The clinical team proceeded in cross titration replacing Paliperidone with Olanzapine. A brain CT scan was also performed, unremarkable. After 10 days of therapy the PANSS score reduced to 102, positive subscale 21.
Conclusions
Initial sinus tachycardia is a common adverse effect of Paliperidone. However in this case the tachycardia was refractory in time even after the 7th day, making an alternative SGA trial necessary.
Post-surgical bleeding after tonsillectomy occurs in 2–7 per cent of cases. This study examined whether heart rate and haematocrit changes are associated with the amount of bleeding.
Method
In this retrospective analytical study, data were collected from the medical charts of patients admitted with post-surgical bleeding.
Results
Over the course of 10 years, there were 218 cases of post-operative bleeding in children aged under 18 years. There was a significant increase in heart rate after the bleeding had started, and a significant decrease in both haemoglobin and haematocrit levels (p < 0.05). There was no significant correlation between the differences in haemoglobin and haematocrit and changes in heart rate.
Conclusion
No correlation was found between the differences in haemoglobin and haematocrit levels and the changes in heart rate from before the surgery to after the bleeding had started. The monitoring of paediatric patients’ heart rate after tonsillectomy surgery solely for the purpose of predicting acute blood loss is therefore discouraged.
Since clinical practice suggests that panic disorder may not be a homogeneous condition, a study was carried out to test the possible existence of different groups or subgroups of panic patients.
Subjects and methods
Thirty-two panic patients (DSM-III-R) underwent lactate challenge in our laboratory and were assessed for heart rate, blood pressure, sweating and Acute Panic Inventory.
Results
During the lactate challenge, patients complaining mainly of ‘cardiorespiratory’ symptoms (N = 12) showed tachycardia and localized sweating. Conversely, patients complaining mainly of ‘pseudoneurological’ symptoms (N = 16) showed bradycardia and generalized sweating. In both groups, Acute Panic Inventory scores were significantly higher during than before the panic attack, but the distribution of the scores was markedly different.
Discussion and Conclusion
The results suggest that panic disorder may be a heterogeneous condition. Implications of these results to other phobic disorders, to Klein’s false suffocation alarm theory and to the ‘extended amygdala model’ are discussed.
Second-generation antipsychotic medications (SGAs) have advanced the treatment of schizophrenia over the past 30 years. However, a number of potentially life-threatening cardiac side-effects associated with these treatments concern and can discourage prescribers from administering these evidence-based treatments. This review provides a practical, psychiatrist-oriented understanding of the relative frequencies, mechanisms, investigations and treatments associated with these cardiac toxicities. We aim to highlight that these are relatively rare complications of an effective class of drug and to promote the advantages of early involvement of cardiologists in the psychiatric multidisciplinary team to guide the investigation and management of these conditions.
LEARNING OBJECTIVES
After reading this article you will be able to:
• understand the relative incidence of cardiotoxic side-effects of the various SGAs
• perform preliminary investigations to diagnose the common cardiotoxic side-effects of SGAs
• understand the treatments for these cardiac side-effects and the role of cardiologists involved the care of these patients.
Supraventricular tachycardia is the most common significant arrhythmia in children. If prolonged, it may cause heart failure and progress to cardiogenic shock warranting prompt treatment. The recommended interventions following vagal manoeuvres are intravenous adenosine and in the unstable patient electrical cardioversion. We present an infant with an unstable supraventricular tachycardia that was resistant to electrical cardioversion and recommended doses of adenosine. He reverted to sinus rhythm with a higher dose of adenosine, suggesting that such doses may be required in refractory supraventricular tachycardia.
This chapter discusses the diagnosis, evaluation and management of pelvic trauma. The most commonly used classification system for pelvic fractures is the Young-Burgess system. This system categorizes injuries on the basis of mechanism of injury and can be used to predict the risk of blood loss. Severely injured patients are often hypotensive and require early intubation and fluid resuscitation. It is important to keep pelvic fractures high in the differential diagnosis when evaluating any patient with multiple injuries. Tachycardia is usually the first abnormal vital sign that may lead to the diagnosis of acute blood loss in severe pelvic trauma. The primary goal is early reduction of pelvic volume, which decreases venous hemorrhage through tamponade and clot formation, thereby improving mortality. Circumferential wrapping of the pelvis with a sheet is an easy and inexpensive option for pelvic binding. Commercially available pelvic binders are also an excellent option.
This chapter discusses the diagnosis, evaluation and management of small bowel obstruction (SBO). It details the specific types of small bowel obstruction. Common causes of small bowel obstruction include hernias, neoplasms, intussusception, and others. Thorough history should be taken, with particular attention paid to prior SBOs, abdominal surgeries, hernias, cancer, and opiate use. The vital signs of SBO are: fever, tachycardia, hypotension, and tachypnea. The examination of the abdomen is performed by visually inspecting the abdomen for scars and distension. Rectal examination is considered with evaluation for occult blood, although diagnostic yield may below and classically the rectal vault will be empty. In laboratory evaluation findings are not specific to bowel obstruction. Results may show evidence of dehydration, acidosis, renal failure, and leukocytosis. Antibiotics are indicated with evidence of ischemia, perforation, or severe disease, although there is no good evidence supporting or refuting the use of empiric broad-spectrum antibiotics.
To confirm the efficacy of pre-hospital administration of adenosine, using a 6 milligram (mg) initial dosing regimen, for the treatment of paroxysmal supraventricular tachycardia (PSVT).
Methods:
Urban, suburban, rural emergency medical services (EMS) system in Clark County, Washington with advanced life support (ALS) patient transports. Concurrent, paramedic Medical Incident Report (MIR) review was conducted for 102 patients receiving prehospital adenosine during a 42-month period. Patients were administered 6 mg of adenosine using an intravenous (IV) bolus followed by 10 ml of balanced salt solution flush. If the patient's rhythm remained unchanged, the dosing regimen was increased to 12 mg followed by a 10 ml flush. This was repeated once more if the rhythm remained unchanged, to a total maximum dose of 30 mg. Medical direction for administration of adenosine was in the form of standing orders rather than direct (on-line) medical control.
Results:
Seventy-four of 102 patients had PSVT as determined by physician analysis of the initial six-second electrocardiographic rhythm strip (ECG) recording. Sixty-six of these patients converted their cardiac rhythm from PSVT using adenosine; 46 (70%) converted with the initial 6 mg bolus. Fifteen patients converted after receiving the second dose (12 mg); and five patients required 30 mg.
Conclusion:
These results show that for paramedics, adenosine is an effective treatment for PSVT. An initial bolus of 6 mg converts the majority of cases. Eighty-nine percent of cases of confirmed PSVT converted with adenosine administration.
Chagas' cardiomyopathy is the most frequent and severe clinical manifestation of chronic Chagas' disease, and is associated with poor prognosis and high mortality rate. Cardiac arrhythmias may cause palpitations, lightheadedness, dizziness, and syncope. Autonomic dysfunction results in marked heart rate abnormalities, especially bradycardia. Sudden death is an occasional complication that may be precipitated by exercise and can be explained by ventricular tachycardia or fibrillation or complete heart block. Mural thrombi form in cardiac chambers and may result in systemic emboli. Stroke is the most important complication of embolism in Chagas' cardiomyopathy. The most commonly used diagnostic test is based on complement fixation, immunofluorescence, or enzyme-linked immunofluorescence assays. Chagas' disease can be diagnosed with greater sensitivity by the detection of Trypanosoma cruzi-specific sequence of DNA. Chagas' disease patients with acute ischemic stroke may also benefit from recombinant tissue plasminogen activator (rtPA).
Radiofrequency catheter ablation is standard treatment for children with re-entrant supraventricular tachycardias. Autonomic changes have been noted after such ablation for atrioventricular nodal re-entry tachycardia, but not as well documented with atrioventricular re-entry over an accessory pathway.
Methods and results
In 10 normal paediatric volunteers and 12 children referred for electrophysiologic testing and radiofrequency ablation of supraventricular tachycardia, non-invasive autonomic function tests and tilt-table testing were performed, and the variability in 24-h heart rate was analysed. Patients with supraventricular tachycardia underwent these tests both 24–72 h before and 24 h after ablation. Patients with tachycardia underwent additional autonomic testing to assess the sensitivity of baroreceptors and the intrinsic heart rate with autonomic blockade immediately before and after ablation. One non-invasive autonomic function test, namely handgrip, demonstrated significant differences (p < 0.05) in diastolic blood pressure before and after ablation, though these values did not differ from controls. Significant decreases were noted in two indexes of the variability of heart rate before and after ablation (p < 0.05). Certain tilt test variables also demonstrated significant differences between controls and those with tachycardia subsequent to ablation. Intracardiac testing demonstrated changes (p < 0.05) in sinus cycle lengths, effective refractory periods and/or blood pressures at baseline and during testing of the sensitivity of baroreceptors before and after ablation. These changes were consistent with increased sympathetic or decreased parasympathetic tone. With autonomic blockade, these differences were abolished.
Conclusions
Catheter ablation of accessory pathways in children was associated with changes consistent with increased sympathetic or decreased parasympathetic tone. These autonomic changes persisted 24 h after the ablation procedure.