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Surgery - Cardiac surgery and cardiovascular disease
Ischemic heart disease
Risk factors encompass male individuals over 45 years, female individuals over 55 years, a familial history of early myocardial infarction, current or treated hypertension, smoking, diabetes mellitus, and elevated cholesterol levels.
Evaluate severity—measure exercise tolerance; inquire about palpitations, orthopnea, utilization of anti-anginals, history of myocardial infarction, percutaneous coronary intervention, or coronary artery bypass grafting. The ECG is the primary regular screening test; yet, it appears normal in approximately one-third of individuals with confirmed ischaemia.
Symptomatic patients scheduled for major surgery should be consulted with a cardiologist to optimize their meds.
Myocardial infarction
The likelihood of a perioperative myocardial infarction is associated with previous medical history and risk factors. • Overall population incidence following abdominal surgery: 0.5%. • Incidence of pre-existing cardiovascular symptoms: 2%. • Incidence of prior myocardial infarction (MI): 5–10%. • Incidence following recent myocardial infarction: 25% (70% will succumb to reinfarction).
Methods for mitigating risk
Non-urgent surgery should be postponed for a minimum of six months after an acute myocardial infarction and potentially after acute ischemia.
Cancer surgery may be performed if the likelihood of disease progression is deemed to surpass the perioperative mortality rate.
Continue all standard cardiovascular medications up to and during surgery. Manage any emergent angina symptoms if surgery is required.
Continue antiplatelet therapy if not contraindicated.
Consider engaging critical care services (HDU) during the perioperative phase.
Valvular cardiac pathology
Cardiac murmurs are prevalent.
Solicit a transthoracic echocardiography (TTE) to assess the lesion and confer with a cardiologist on the anomalies.
Severe aortic stenosis presents a significant mortality risk; elective surgery should be deferred. High-gradient aortic stenosis is related with a 10% mortality rate during non-cardiac surgery.
Severe mitral stenosis may result in pulmonary edema and cardiac failure; hence, significant elective surgery should be deferred until the defect is rectified.
Aortic regurgitation (AR) necessitates management of fluid balance and heart rate. Antibiotic prophylaxis is indicated, however the procedure may proceed. Mitral regurgitation (MR) ought to be treated with diuretics and vasodilators. Left ventricular (LV) function is often exaggerated in.
Prosthetic valves present numerous complications. Mechanical valves necessitate anticoagulation. Discontinue warfarin five days before to surgery and initiate heparin bridging once the international normalized ratio (INR) falls below therapeutic levels.
Cease IV heparin 2 to 6 hours before to surgery and reinstate it as soon as postoperative bleeding is adequately controlled, until the INR reaches therapeutic levels.
Thrombosis is more probable in the presence of mechanical valves, compromised left ventricular (LV) function, a history of thromboembolic disease, and to a lesser extent in rate-controlled atrial fibrillation (AF).
In surgical procedures addressing life-threatening hemorrhage, such as from a bleeding peptic ulcer or intracranial hemorrhage, it may be essential to reverse anticoagulation for multiple days. Collaborate closely with cardiology. Prosthetic valves no longer necessitate antibiotic prophylaxis for procedures that induce bacteraemias; if uncertain, consult with cardiology.
Hypertension arterial
Preoperative management of blood pressure may diminish the propensity for perioperative ischemia. If hypertension is severe (>180 mmHg), surgical intervention should be postponed until adequate control is achieved. • Evaluate current antihypertensive management or initiate treatment: consult with the anaesthetist.
Examine for indications of end-organ damage (renal, neurological) and concomitant cardiovascular disease. • Investigate uncommon yet significant etiologies: phaeochromocytoma, hyperaldosteronism, coarctation of the aorta, renal artery stenosis.
Congestive heart failure
Heart failure correlates with adverse outcomes in non-cardiac surgery. Risk factors encompass ischemic and valvular heart disease.
• Identify: S3, pedal edema, elevated jugular venous pressure (JVP), bibasal crepitations. Request a chest X-ray (CXR) if suspicion is present.
Cardiac arrhythmias
Arrhythmias and conduction abnormalities are prevalent. Asymptomatic arrhythmias do not correlate with an elevated risk of cardiac problems; however, it is essential to investigate potential underlying diseases, such as ischemic heart disease, medication toxicity, and metabolic disturbances. High-grade conduction problems, such as total heart block, necessitate consultation with a cardiologist. Pacing may be warranted. Patients with a history of atrial fibrillation, especially those with a prior embolic stroke or structural heart abnormality, typically receive warfarin therapy. Solicit a cardiology evaluation preoperatively if rate control is inadequate.
• Permanent pacemakers or implantable cardioverter-defibrillators (ICDs). Diathermy may induce a pacemaker reset, entirely block pacing, and activate ICD discharge. Pacemakers and implantable cardioverter-defibrillators (ICDs) must be assessed by a cardiac technician both preoperatively and postoperatively. Pacemakers must be adjusted to fixed-rate pacing during surgery and subsequently reset postoperatively. ICDs must be deactivated to avert discharge, and external defibrillator pads should be placed on the patient.
When defibrillation or synchronized cardioversion is necessary, position the paddles as far as feasible from the pacemaker or ICD. The specific sort of diathermy employed must be taken into account. Monopolar is not unequivocally contraindicated; nevertheless, bipolar may be more advantageous.
Ischemic heart disease
Risk factors encompass male individuals over 45 years, female individuals over 55 years, a familial history of early myocardial infarction, current or treated hypertension, smoking, diabetes mellitus, and elevated cholesterol levels.
Evaluate severity—measure exercise tolerance; inquire about palpitations, orthopnea, utilization of anti-anginals, history of myocardial infarction, percutaneous coronary intervention, or coronary artery bypass grafting. The ECG is the primary regular screening test; yet, it appears normal in approximately one-third of individuals with confirmed ischaemia.
Symptomatic patients scheduled for major surgery should be consulted with a cardiologist to optimize their meds.
Myocardial infarction
The likelihood of a perioperative myocardial infarction is associated with previous medical history and risk factors. • Overall population incidence following abdominal surgery: 0.5%. • Incidence of pre-existing cardiovascular symptoms: 2%. • Incidence of prior myocardial infarction (MI): 5–10%. • Incidence following recent myocardial infarction: 25% (70% will succumb to reinfarction).
Methods for mitigating risk
Non-urgent surgery should be postponed for a minimum of six months after an acute myocardial infarction and potentially after acute ischemia.
Cancer surgery may be performed if the likelihood of disease progression is deemed to surpass the perioperative mortality rate.
Continue all standard cardiovascular medications up to and during surgery. Manage any emergent angina symptoms if surgery is required.
Continue antiplatelet therapy if not contraindicated.
Consider engaging critical care services (HDU) during the perioperative phase.
Valvular cardiac pathology
Cardiac murmurs are prevalent.
Solicit a transthoracic echocardiography (TTE) to assess the lesion and confer with a cardiologist on the anomalies.
Severe aortic stenosis presents a significant mortality risk; elective surgery should be deferred. High-gradient aortic stenosis is related with a 10% mortality rate during non-cardiac surgery.
Severe mitral stenosis may result in pulmonary edema and cardiac failure; hence, significant elective surgery should be deferred until the defect is rectified.
Aortic regurgitation (AR) necessitates management of fluid balance and heart rate. Antibiotic prophylaxis is indicated, however the procedure may proceed. Mitral regurgitation (MR) ought to be treated with diuretics and vasodilators. Left ventricular (LV) function is often exaggerated in.
Prosthetic valves present numerous complications. Mechanical valves necessitate anticoagulation. Discontinue warfarin five days before to surgery and initiate heparin bridging once the international normalized ratio (INR) falls below therapeutic levels.
Cease IV heparin 2 to 6 hours before to surgery and reinstate it as soon as postoperative bleeding is adequately controlled, until the INR reaches therapeutic levels.
Thrombosis is more probable in the presence of mechanical valves, compromised left ventricular (LV) function, a history of thromboembolic disease, and to a lesser extent in rate-controlled atrial fibrillation (AF).
In surgical procedures addressing life-threatening hemorrhage, such as from a bleeding peptic ulcer or intracranial hemorrhage, it may be essential to reverse anticoagulation for multiple days. Collaborate closely with cardiology. Prosthetic valves no longer necessitate antibiotic prophylaxis for procedures that induce bacteraemias; if uncertain, consult with cardiology.
Hypertension arterial
Preoperative management of blood pressure may diminish the propensity for perioperative ischemia. If hypertension is severe (>180 mmHg), surgical intervention should be postponed until adequate control is achieved. • Evaluate current antihypertensive management or initiate treatment: consult with the anaesthetist.
Examine for indications of end-organ damage (renal, neurological) and concomitant cardiovascular disease. • Investigate uncommon yet significant etiologies: phaeochromocytoma, hyperaldosteronism, coarctation of the aorta, renal artery stenosis.
Congestive heart failure
Heart failure correlates with adverse outcomes in non-cardiac surgery. Risk factors encompass ischemic and valvular heart disease.
• Identify: S3, pedal edema, elevated jugular venous pressure (JVP), bibasal crepitations. Request a chest X-ray (CXR) if suspicion is present.
Cardiac arrhythmias
Arrhythmias and conduction abnormalities are prevalent. Asymptomatic arrhythmias do not correlate with an elevated risk of cardiac problems; however, it is essential to investigate potential underlying diseases, such as ischemic heart disease, medication toxicity, and metabolic disturbances. High-grade conduction problems, such as total heart block, necessitate consultation with a cardiologist. Pacing may be warranted. Patients with a history of atrial fibrillation, especially those with a prior embolic stroke or structural heart abnormality, typically receive warfarin therapy. Solicit a cardiology evaluation preoperatively if rate control is inadequate.
• Permanent pacemakers or implantable cardioverter-defibrillators (ICDs). Diathermy may induce a pacemaker reset, entirely block pacing, and activate ICD discharge. Pacemakers and implantable cardioverter-defibrillators (ICDs) must be assessed by a cardiac technician both preoperatively and postoperatively. Pacemakers must be adjusted to fixed-rate pacing during surgery and subsequently reset postoperatively. ICDs must be deactivated to avert discharge, and external defibrillator pads should be placed on the patient.
When defibrillation or synchronized cardioversion is necessary, position the paddles as far as feasible from the pacemaker or ICD. The specific sort of diathermy employed must be taken into account. Monopolar is not unequivocally contraindicated; nevertheless, bipolar may be more advantageous.
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