Hypertensive patients commonly have surgery cancelled due to inadequate blood pressure control. Preoperatively, it is important to assess for end organ damage, optimize blood pressure control, and determine if surgery should be postponed to improve damage. During surgery, blood pressure should be maintained within 20% of baseline through appropriate anesthetic agents, opioids, and vasodilators while carefully monitoring for hypotension due to anesthetic interventions or blood loss. Postoperatively, blood pressure medications may need to be resumed and fluids mobilized to prevent late hypertension.
2. • Commonest cause of case cancellation in a
preanesthetic clinic is
• Hypertension ± hypokalemia
3. Incidence
• The total incidence of hypertension in preoperative
phase was 10.16%.
• Among them 64.9% being male and 35.1% female.
Maximum incidence was found in age group 50-59 years
i.e. 26.6%.
• Among the case detected maximum patients i.e. 52%
were patients with newly diagnosed hypertension
• 61.1% were using calcium channel blockers.
6. • Primary - 95 %
• ( Without any cause )
• Secondary – 5 %
• renal
• Endocrine
• Neurogenic
• Coarctation etc..
7. Clinical picture ?? !!
• “Vasoconstricted” hypertension—in medical patient with
chronic renovascular hypertension, characterized by diastolic
hypertension and ↑ systemic vascular resistance
with normal or even decreased cardiac output and heart rate.
• “Hyperdynamic” hypertension—in postoperative surgical
patient, characterized by acute systolic hypertension; widened
pulse pressure; and increased cardiac output, heart rate
8. Why we need to know
• Is it primary or secondary ??
• End organ damage - associated
• A sudden intraoperative rise – ICH or LV failure !!
• Increased incidences of myocardial ischemic
episodes
• On induction changes more
• On intubation changes more
• Overall cardiac risk higher
9. What do we note as anesthetist ?
• Control of hypertension – adequacy ??
• Up to a Diastolic of 110 – OK
• 160/ 110 is ok for elective case – debate going
on
• Pharmacology of drugs !!
10. Drugs
• Beta blockers (with vasodilation) ( HR of 60)
• Calcium channel blockers
• ACE inhibitors
• ARBs
• Diuretics -- (more in ISH)
• Garlic and anticoagulation
11.
12. Does it matter ?
• co-existing hypertension may increase the incidence of
postoperative myocardial reinfarction in patients with a
history of myocardial infarction
• Incidence of neurologic complications in patients undergoing
carotid endarterectomy.
• In hypertensive patients who exhibit signs of target organ
damage, postponement of an elective procedure is justified if
that end-organ damage can be improved or if further
evaluation of that damage could alter the anesthetic plan.
13. • BP of 150/90
• But creatinine is 1.8 –
• Check if There is LVH
• Can we improve that ?
• Does it alter the anesthetic process and plan ?
14. Clinical pearls
• LVH is associated with systolic hypertension
more
• Renal end organ damage is associated with
more perioperative morbidity
• History of TIA,. Old CVA – look for fundus
15. • White coat hypertension
• NIBP can overestimate in elderly
hypertensives
• PAC – MGMCRI
White-coat hypertension (WCHT) is
defined as a nurse-taken blood pressure
of <140/90 when compared with a
physician-taken value of >160/95.
16. When to postpone ?
• Stage 3 hypertension – 180/ 110 or more
Stage 2 hypertension with end organ damage
• Eg. 170/106 with nephropathy (Creat - > 2)
• Patients with newly diagnosed mild
hypertension, treatment may be delayed till
after surgery.
17. Cancel ?? !!
• when canceling a procedure for adequate BP control,
one must be aware that this may take 3 to 4 weeks
and in some cases, up to two months.
• There is no benefit in postponing the procedure for
one or two days, which would only bring
inconveniences for patients and the hospital.
• End organ damage is different
18. What is the procedure
• Cosmetic surgery
• Or
• Oncological surgery
• Or
• Hip fracture
• Medico legal issues
Individualize
Vascular procedure , major
blood loss expected
Further cardiac evaluation
19. Now – any idea ??
• Diastolic more than 110 with dyslipidemia
with smoking with proteinuria
• Totally elective case – can wait
• How long to wait ??
• Aggressive treatment with anxiolytics, statins
and antihypertensives – 30 days !!
20. drugs – to continue or not
• The safety of β-blockers and their benefits (prevention of
hypertensive responses, dysrhythmias, and myocardial ischemia)
have been long established.
• ACE inhibitors – hypotension on induction common – but not to
discontinue – (plan regional – may stop the drug )
• Better to stop ACE inhibitors if major surgery with fluid shifts
expected
• Amlodipine – continue
• Diuretics also continue – but check on electrolytes and volume
status
21. Prys robert school of thoughts
• Patients with atherosclerotic disease, who present
with raised systolic pressure, but normal or low
diastolic pressure, should not be considered as true
hypertensive and should not have their surgery
delayed
22. Goldman and Caldera school
• Diastolic more than 110
• End organ damage
• Must to treat
23. Potassium
• Upto 3 =OK
• Less than 3 – can correct with oral or change of drugs
if not any urgency
• Otherwise – IV potassium correction
• Chronic diuretic use – can we correct ? Harmful !
• But chronic hypokalemia does not seem to increase
perioperative complications –
• more Useful in patients with cardiac illness
• With digoxin – act
25. Preoperative essence
• Primary or secondary
• Stage – treated or not – severe- white coat ?
• Target organ damage
• CVA , CAD , LVH , Creatinine
• X-ray in hypertensive breathless patients
ECG and
creatinine
26.
27. Premedication
• Anxiolysis
• Beta blockers CCBs to continue
• ARBs – can be discontinued – refractory
hypotension- possibly 10 hours
• Clonidine – better hemodynamics and
sedation – think of withdrawal also
• dexmed-Better in myocardial infarction,
myocardial ischemia) but an increased
incidence of hypotension and bradycardia
28. Intraoperative hypertension
• Intraoperatively esmolol, where available, may be very
valuable for controlling sudden tachycardia and
hypertension, but remember
• Labetolol - if the hypertensive event is due to an excess
of catecholamines, caused either by administration of
adrenaline or cocaine by the surgeon, or by endogenous
secretion (e.g. phaeochromocytoma).
30. Laryngoscopy and intubation
• Hypertensives made normal also show
exaggerated response
• Agent, fentanyl, IV lignocaine ,IV nitroprusside
IV esmolol – 15 seconds – put the tube
• Think of exaggerated hypotension than allow
a small increase in BP also !!
32. Maintenance of Anesthesia
• MAP – maintained between 20 % of baseline
is the aim than the technique
• Agent
• Vecuronium
• Regional
• Narcotics
• Nitroprusside
IPPV and hypocapnia can
decrease cardiac output
Hypocapnia can cause
hypokalemia in patients
receiving diuretics
33. Which case ?
• The monitoring can extend from simple
manual BP monitoring
• to intra-arterial BP monitoring to automatic
NIBP, ECG, pulse oximeter, capnography,
PAWP, transesophageal echocardiography, etc
• Monitor under the table
• Monitor blood loss
35. • During anesthesia, exaggerated decreases in blood
pressure seen with blood loss, positive pressure
ventilation, or sudden changes in body position
• Are we dealing with drugs affecting ANS
38. Regional anesthesia
• Nerve blocks – good
• Neuraxial – Acceptable
• less drastic fall – epidural
• Intrathecal narcotics
• Ephedrine better than phenylephrine to
counter hypo in neuraxial blocks
• Sometimes we need vasopressin
• May unmask hypovolemia
39. We don’t want these in post op period
• Hypoxemia
• Full bladder
• Shivering
• Pain
• Anxiety
40. Postoperative period- sometimes late
• Hypertension may also be the result of intravascular
volume overload from excessive intraoperative
intravenous fluid therapy, and persist 24 to 48 hours
until the fluid has been mobilized from the
extravascular space.
• Blood pressure can also rise due to discontinuation
of blood pressure medications postoperatively
41. Summary
• Hypertension – common cause of cancellation
• Stages and when to intervene
• 4-6 weeks to normalize autoregulation
• End organ damage
• Drugs to continue
• Premedicate
• Induce and intubate – smooth – 20 % BP
• IPPV and PaCO2 maintain
• Extubate smooth
• Drugs to continue
Thank you all
