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Perioperative Pain Management of Patients Presenting for Cardiac Surgery 347
serious side effects following on-pump cardiac surgery [63]. Another study demon-
strated a decreased time to extubation and decreased postoperative pain scores
with magnesium sulfate administration during elective CABG surgery [64]. These
studies demonstrate promise for magnesium as a non-opioid analgesic, but further
high-quality studies are necessary to draw firm conclusions.
Intravenous Lidocaine
Perioperative infusions of intravenous lidocaine have been shown to improve pain
control after certain types of surgery. The mechanism of action for intravenous lido-
caine in improving perioperative pain control is complex and still being fully eluci-
dated but is felt to be related to its ability to attenuate the proinflammatory effects of
surgery rather than its effect on sodium channels [65]. Lidocaine infusions utilized for
abdominal surgery have been found to reduce pain scores and postoperative opioid
requirements [66]. Doses greater than or equal to 2 mg/kg/h were associated with
decreased pain scores and opioid consumption in the first 24 h, however smaller
doses were not. There is evidence that perioperative lidocaine administration may
decrease the duration of ileus and decrease the incidence of postoperative nausea
and vomiting [67]. In addition, toxicity related to the use of perioperative lidocaine
infusions appears to be exceedingly rare [68]. The data for the use of periopera-
tive lidocaine infusions in the setting of cardiac surgery is not as supportive. Insler
et al. found no difference in pain scores or opioid consumption in cardiac surgery
patients receiving an intraoperative lidocaine infusion [69]. However, Wang et al.
did demonstrate a lower incidence of postoperative cognitive dysfunction in cardiac
surgery patients receiving an intraoperative lidocaine infusion [70].Basedonthis
limited data, perioperative lidocaine infusions are not currently recommended for
analgesia in cardiac surgery patients. Given the positive data in other surgical popu-
lations, further study may help define a role for this adjunct in the future in t he cardiac
surgery patient.
6 Regional Techniques
Multimodal analgesia techniques with regional anesthesia are becoming increasingly
popular for ERAS to improve patient outcomes and satisfaction. Historically,regional
techniques in cardiac surgery consisted of thoracic epidurals, paravertebral blocks,
and intercostal blocks. However, with the introduction of and increased availability
of ultrasound imaging, there are various fascial plane blocks that may now represent
reasonable analgesic options for cardiac surgeries.
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348 E. R. Simon et al.
Thoracic Wall Innervation
Understanding the anatomy of the thoracic wall and its innervation is crucial to
understanding the regional interventions available for the cardiac surgery patient.
The thoracic wall is primarily innervated by the intercostal nerves, which derive
from the anterior rami of spinal nerves T1-11. The intercostal nerves run between
adjacent ribs. The anterior ramus of T12 is a subcostal nerve because it enters the
abdominal wall [71, 72]. The typical intercostal nerve traverses laterally behind the
sympathetic trunk, entering the intercostal space between the parietal pleura and
intercostal membrane. In the costal groove, it runs with the intercostal vessels. Near
the midaxillary line, the lateral cutaneous branches emerge. The lateral cutaneous
branch pierces through the muscles of the lateral thoracic wall to divide into anterior
and posterior branches and innervate the skin of the lateral thoracic wall. Near the
sternum, the intercostal nerves cross anterior to the internal thoracic artery to become
anterior cutaneous branches. The anterior cutaneous branch is the terminal branch.
It divides into medial and lateral branches to supply sensory innervation to the skin
of the anterior thoracic wall [71, 72].
Thoracic Epidural Analgesia
Thoracic epidural analgesia (TEA) has been considered the gold standard for post-
operative pain management after thoracic surgeries. Epidural analgesia can also
be beneficial for cardiac surgery. However, utilization is controversial due to the
theoretical increased risk of epidural hematoma and consequent neurologic damage
associated with full systemic heparinization for cardiopulmonary bypass. There is
also a risk of hypotension from the sympathectomy that may compromise cardiac
perfusion. Sympathectomy and resulting afterload reduction may be specifically
contraindicated in patients with severe aortic stenosis or hypertrophic cardiomy-
opathy. Despite concerns, epidural analgesia may reduce the risk of postoperative
complications, such as pneumonia, respiratory failure, myocardial infarction, renal
injury, arrhythmias, decrease mechanical ventilation time, and decrease the amount
of time that patients spend in the ICU. Epidural analgesia may also attenuate the
surgical inflammatory response and provide cardioprotective effects by increasing
myocardial oxygen availability and decreasing myocardial oxygen consumption due
to the sympathectomy [73, 74].
In a 2019 Cochrane review, it was concluded that thoracic epidural analgesia does
not change the risk of mortality or pneumonia compared to systemic analgesia in
cardiac surgery [73]. Epidural analgesia may decrease the risk of myocardial infarc-
tion, respiratory depression, and atrial arrhythmias, reduce the duration of tracheal
intubation, and decrease pain scores at 6, 24, 48, and 72 h following surgery. Epidural
analgesia may increase the risk of hypotension and the need for vasopressor boluses,
but there is no difference in vasopressor infusions. No increased risk for epidural
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Perioperative Pain Management of Patients Presenting for Cardiac Surgery 349
hematoma was found, however, there were not enough participants to sufficiently
evaluate the risk of hematoma formation following epidural catheter placement. The
American Society of Regional Anesthesia and Pain Medicine (ASRA) guidelines
are limited by insufficient available data to determine the increased risk of neuraxial
hematoma formation encountered when using neuraxial techniques with full anti-
coagulation required for cardiac surgery. Perioperative anticoagulation guidelines
provided by ASRA are intended to apply to neuraxial and deep blocks including
paravertebral blocks [73].
Paravertebral Block
The thoracic paravertebral space is located on either side of the vertebral column.
The anterolateral boundary is formed by the parietal pleura, the base is formed by the
vertebral body, intervertebral disc, and the intervertebral foramen, and the posterior
boundary is formed by the transverse process and superior costotransverse ligament.
A paravertebral block (PVB) produces an ipsilateral motor, sensory, and sympathetic
nerve block by anesthetizing the intercostal nerves in the paravertebral space, as well
as local anesthetic extension into the intercostal space laterally and epidural space
medially [75].
There are various ultrasound-guided PVB techniques, including transverse or
sagittal transducer orientation and in-plane or out-of-plane approaches. In general, the
needle will be directed between adjacent transverse processes and traverse the supe-
rior costotransverse ligament with anterior deflection of the parietal pleura observed
when local anesthetic is injected into the paravertebral space. The block level should
be near the dermatome for the incision and either multiple levels or a single injection
of a larger volume of local anesthetic can be performed to cover the desired area of
analgesia [75].
PVBs may be beneficial for minimally invasive procedures, thoracotomy inci-
sions as well as midline sternotomy incisions given the location of neural blockade.
Complications following paravertebral blockade include vascular puncture, hypoten-
sion, pleural puncture, pneumothorax, inadvertent epidural or spinal anesthesia, and
local anesthetic systemic toxicity (LAST). PVBs are considered a deep block and
are therefore subject to the same anticoagulation guidelines as those that exist for
epidural catheter placement [75].
There are limited studies evaluating the role of PVBs in cardiac surgery. The few
studies that are available have demonstrated that bilateral PVBs can be effective and
safe. The use of PVBs can facilitate early extubation and decrease opioid usage [76–
78]. They have been shown to reduce pain scores, decrease intraoperative opioid use,
facilitate extubation, and provide similar analgesia to epidurals [79]. Studies have also
shown that PVBs can decrease the incidence of nausea, vomiting, hypotension, and
urinary retention [80, 81]. PVBs are becoming more popular for minimally invasive
cardiac surgery through a thoracotomy or video-assisted thoracoscopic approach.
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350 E. R. Simon et al.
Pectoralis I and II Blocks
Pectoralis I (Pecs I) nerve block involves depositing local anesthetic between the
pectoralis major and pectoralis minor muscles to block the lateral and medial pectoral
nerves, which innervate the pectoralis muscles. Pectoralis II (Pecs II) nerve blocks
involves depositing local anesthetic between the pectoralis muscles and a second
injection between the pectoralis minor and serratus anterior muscles. Pecs II blocks
the pectoral nerves, upper intercostal (3–6) nerves, as well as the intercostobrachial,
thoracodorsal and long thoracic nerves.
These nerve blocks are performed in-plane with needle trajectory medial to lateral.
The ultrasound transducer is positioned sagittal with an inferolateral angle at the
midclavicular area. The transducer is then moved laterally to obtain the appropriate
images. Pecs I is performed at the level of ribs 2–3. The first injection of Pecs II is
similar to Pecs I, while the second injection is at the anterior axillary line at the level
of the fourth rib [82].
Pecs I use is limited and primarily for more superficial, anterior chest wall surg-
eries that include disruption of the pectoralis muscles (i.e. placement of a submus-
cular ICD). Pecs II is more useful in the setting of cardiac procedures and may be
utilized to provide analgesia for anterolateral chest surgeries, such as breast surgery,
subcutaneous implantable cardiac defibrillators (SICD), video assisted thoracoscopic
surgery (VATS), and anterior thoracotomies. Pecs blocks do not anesthetize anterior
cutaneous branches and therefore may be better indicated for antero-lateral inci-
sions and procedures. Complications are rare but include pneumothorax, infection,
vascular puncture, and local anesthetic systemic toxicity [82].
There have been limited studies on Pecs blocks in the setting of cardiac surgery.
These blocks are performed in a supine position so they can be useful as rescue
blocks in patients who have limited mobility secondary to lines, chest tubes, and
mechanical ventilation. A study of 40 patients undergoing coronary artery bypass
grafting or valve surgeries via midline sternotomy found that bilateral Pecs II blocks
helped with early extubation, improved pain scores at rest and with cough, and
improved incentive spirometry flow rates compared with no Pecs blocks [81, 83].
Serratus Anterior Plane Block
The serratus anterior plane (SAP) block can be performed superficially or deep
to the serratus anterior muscle to anesthetize the anterolateral chest wall (T2–9
dermatomes). This block targets the lateral cutaneous branches of the thoracic inter-
costal nerves as well as intercostobrachial, long thoracic, and thoracodorsal nerves.
At the level of the fifth rib, the superficial plane is formed by the anterior aspect of
the serratus anterior muscle and the posterior aspect of the latissimus dorsi muscle.
The deep plane is formed by the posterior aspect of the serratus anterior muscle and
the external intercostal muscles and ribs [84].
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Perioperative Pain Management of Patients Presenting for Cardiac Surgery 351
The SAP block is performed at the level of the fifth rib around the midaxillary
line. The transducer is oriented in the coronal plane and tilted posteriorly to identify
the latissimus dorsi lying superficial to the serratus anterior muscle. An in-plane
technique is used with anterior to posterior needle trajectory and local anesthetic can
be injected above or below the serratus anterior muscle [84].
Common indications for the SAP block include lateral rib fractures, VATS,
thoracotomy, SICD placement, and breast surgery. Complications are rare but
include pneumothorax in addition to other known complications inherent to regional
techniques [84].
This block spares the midline chest area; thus, no studies have been performed
for sternotomies. Two studies have shown that this block can be safe and efficacious
in cardiac device implantation [81]. Several studies found that this block can reduce
pain scores and opioid consumption for minimally invasive cardiac surgery [85–87].
Erector Spinae Plane Block
The erector spinae plane (ESP) block is a paraspinal fascial plane block where l ocal
anesthetic is injected between the erector spinae muscle and thoracic transverse
processes. The mechanism of action is not fully understood. It blocks the dorsal and
ventral rami of the thoracic spinal nerves for multi-dermatomal sensory block of
anterior, posterior, and lateral thoracic walls. Local anesthetic may also diffuse into
the paravertebral and epidural spaces [88].
The ESP block can be performed at either a single level or multiple levels for
adequate analgesic coverage. The block spreads over multiple vertebral levels and
therefore a single injection of a large volume of local anesthetic may provide diffuse
analgesia. The ultrasound transducer is placed in a paramedian sagittal orientation and
moved laterally until transverse processes are visible. Usually an in-plane approach
is used with local anesthetic injected below the erector spinae muscle to effectively
“lift” this muscle off the transverse processes below [88].
This block can be used for a wide variety of surgical procedures in the anterior,
posterior, and lateral thoracic areas. Complications are rare, but include pleural punc-
ture, pneumothorax, and other complications associated with regional techniques
[88].
ESP blocks are not well studied in cardiac surgery, but have been shown to
decrease opioid consumption, pain scores, duration of time in the ICU, and time
to extubation [89–91]. One prospective study of 50 patients demonstrated that ESP
blocks were comparable to TEA with regard to postoperative pain scores, incentive
spirometry, and ventilator and ICU duration [92].
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352 E. R. Simon et al.
Pectointercostal Fascial Plane Block and Transverse Thoracic
Muscle Plane Block
The pectointercostal fascial plane block (PIFB) involves injecting local anesthetic
between the pectoralis major muscle and internal intercostal muscles to block the
anterior cutaneous branches of the intercostal nerves. The transverse thoracic muscle
plane (TTP) block is a deeper version of the PIFB with the injection of local anesthetic
occurring between the internal intercostal and transverse thoracic muscles. These
blocks target the T2-6 dermatomal distribution in a unilateral fashion meaning that
bilateral blocks would be required to provide sternotomy analgesia [93, 94].
The PIFB is usually performed with an in-plane needle approach with the ultra-
sound transducer in a parasagittal orientation 1–2 cm lateral to the sternum. The local
anesthetic is deposited between the pectoralis major and intercostal muscles. The TTP
utilizes the same approach, except the local anesthetic is deposited deeper between
the internal intercostal and transverse thoracic muscles. The injections usually occur
at the level of the fourth or fifth rib [94].
Both blocks can be helpful for midline chest surgeries including thymectomies,
sternotomies, and cardiac device implantation [93]. Complications are rare, but
include injury to the internal thoracic artery, pneumothorax, and pericardial puncture.
The PIFB is potentially safer than the TTP because it is a more superficial block.
Several studies have demonstrated that PIFBs decrease pain scores, opioid
consumption, time to extubation, ICU duration, and hospital length of stay after
cardiac surgery [95–99]. Several studies have also shown TTP blocks result in
decreased opioid consumption, pain scores, time to extubation, ICU duration,
and hospital length of stay after cardiac surgery [100–102]. A prospective study
comparing PIFB to TTP blocks showed that they have similar efficacy and that pain
scores and morphine consumption were similar for the two interventions in the first
24 h following cardiac surgery [103].
In general, studies on fascial plane blocks are limited in cardiac surgery but have
been shown to have promising results. Fascial plane blocks have advantages over
neuraxial blocks because they have a better safety profile, particularly in the setting
of anticoagulation, are associated with hemodynamic stability, and can be performed
under general anesthesia with most in a supine position. More randomized controlled
trials are needed to effectively compare the various fascial plane blocks as well as
continuous versus single shot blocks in both minimally invasive and open cardiac
surgeries.
7 Conclusion
The push for fast-track and ERAS protocols for the postoperative management of
the typical cardiac surgical patient has emphasized the need for aggressive pain
management. Similar to noncardiac surgery, effective perioperative pain control can
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Perioperative Pain Management of Patients Presenting for Cardiac Surgery 353
improve patient morbidity and mortality after cardiac surgery. Each member of the
care team can make a significant contribution towards this effort, from preopera-
tive education to prevention to assessment and treatment. In addition to standard
multimodal management using oral and intravenous medications, the recent devel-
opment of novel regional anesthesia techniques necessitates their inclusion in the
perioperative management of the cardiac surgical patient.
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