Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “PECTORALIS MUSCLES”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,189 records · Page 66Linked to original sources
PubMed1989

Cancer cell emboli in the pectoral lymphatics of patients with breast cancer.

In order to investigate the possibility of local recurrence in the pectoral muscles of patients who undergo modified radical mastectomies, the cancer cell involvement of the lymphatics associated with the pectoralis major muscle was studied in 39 patients who underwent a standard radical mastectomy for Stage I-III breast cancer. Cancer cell emboli were found in the transpectoral lymphatics of 2 patients (2/39 = 5.1 per cent) and in the pectoral fascial lymphatics of 6 patients (6/39 = 15.4 per cent). Two patients with fascial lymphatic cancer cell emboli were from a group of 14 patients with intramammary lymphatic tumor emboli of a low degree (ly 1). The other 6 patients with cancer cell emboli in either the pectoral fascia or the transpectoral lymphatics were from a group of 11 patients with intramammary lymphatic tumor emboli of a moderate degree (ly 2). There was a significant relationship between the intramammary and the pectoral lymphatic cancer cell emboli (Chi square test: (p less than 0.05). The results of this study therefore indicate that lymphatic cancer cell emboli in the pectoral fascia and muscle are an important risk factor for patients who undergo a modified radical mastectomy.

Adult↗
PubMed2006

Poland's syndrome and head-and-neck tumour: an unusual association causing a reconstruction dilemma.

Poland's syndrome is a rare congenital anomaly characterized by unilateral chest wall hypoplasia and ipsilateral hand abnormalities. The literature data suggest its sporadic nature. The prevailing theory concerning its cause is hypoplasia of the subclavian artery or its branches, which may lead to a range of developmental changes. Relationships have been demonstrated between tumours and Poland's syndrome and also between tumours and other developmental defects. The explanation may lie in abnormal homeobox and tumour suppressor genes. This paper presents the first literature report of a malignant tonsillo-lingual tumour with metastatic neck involvement in a patient with partial Poland's sequence. In consequence of the aplasia of the pectoralis major muscle, an alternative (a free radical forearm flap) to the routine head-and-neck reconstruction (pedicled pectoralis major flap) was necessitated following tumour excision and radical neck dissection. This case report surveys the diagnostic and therapeutic considerations when previously unnoticed Poland's syndrome is diagnosed in a patient with head-and-neck cancer. One year following major head-and-neck surgery, our patient is tumour-free.

Carcinoma, Squamous Cell↗
PubMedDate not supplied

Pectoralis major rupture in the elderly: clinical and sonographic findings.

We describe clinical and sonographic features of pectoralis major rupture in the elderly, which is relatively rare and unknown. Patients presented with a large pectoral ecchymosis extending to the axilla, chest wall, breast and arm. The pectoral area was sensitive, sometimes with a visible and palpable defect in the axilla. Ultrasound examination showed a large hypoechoic, well-circumscribed structure representing a hematoma within the pectoralis major muscle, partially replacing the normal echo muscle pattern. Ultrasonography is a useful, low cost diagnostic tool, and is recommended in the investigation of pectoralis major rupture in the elderly.

Aged↗
PubMed1993

Effect of cold acclimation on oxidative capacity and respiratory properties of liver and muscle mitochondria in ducklings, Cairina moschata.

1. The effect of cold acclimation on the oxidative capacity of the skeletal muscle (gastrocnemius and pectoralis) and the liver of ducklings was investigated. 2. In cold-acclimated (CA) ducklings, the oxidative capacity of the liver was higher (+40%) than in ducklings reared at thermoneutraility (TN). In these animals an increase in state 4 respiration and a decrease in the respiratory control index (RCI) was also found. 3. The oxidative capacity of both pectoralis and gastrocnemius muscles also increased in CA animals. 4. In these muscles the oxidatibe capacity of the subsarcolemmal mitochrondrial fraction of CA ducklings was higher (+96% in the gastrocnemius and +58% in the pectoralis) than the intermyofibrillar one (+51% in the gastrocnemius and +33% in the pectoralis). No variations were observed in either the RCI or the ADP/O ratios. 5. These findings indicate that the energy expenditure needed for non-shivering thermogenesis (NST) in cold-acclimated ducklings can be met by the increase in the oxidative capacity of the skeletal muscle and the liver, each by different mechanisms; the gastrocnemius muscle would seem to play a prominent role.

Acclimatization↗
PubMed1993

[Proximal lower motor neuron syndrome associated with serum antibodies to asialo-GM1, GM1 and LM1].

A 31-year-old man had noticed slowly progressive weakness in his right upper limb girdle. On admission at age 32, fasciculation and muscle atrophy were observed in the right pectoralis major muscle. There was mild muscle weakness in the right triceps brachii muscle. The deep tendon reflexes were normal and the pathologic reflexes were absent. Sensory and autonomic nerve functions were intact. Needle EMG showed fibrillation potentials and positive sharp waves in the right pectoralis major, infraspinatus, extensor carpi radialis, extensor digitorum muscles, the bilateral sternocleidomastoideus and triceps brachii muscles. Motor nerve conduction studies revealed normal conduction velocities and distal latencies as well as no evidence of conduction block or abnormal temporal dispersion. Serum immunoelectrophoresis failed to detect an M protein. Thin-layer chromatography with immunostaining revealed that the serum contained auto antibodies which reacted with asialo-GM1, GM1 and LM1. This case must belong to "proximal lower motor neuron syndrome" proposed by Pestronk et al.

Adult↗
PubMed2005

Subincisional muscular coverage of expander implants in immediate breast reconstruction with pectoralis flaps.

Immediate breast reconstruction with expander implants is a safe, simple procedure that allows for a rapid physical and emotional postmastectomy recovery. When complications occur, the patient may be left with a prolonged reconstructive course. Such complications may result from thin mastectomy flaps and resulting marginal skin flap necrosis and implant exposure. Muscle coverage of the implant under the skin incision prevents such marginal necrosis of skin flap from becoming a factor in implant loss. This paper demonstrates a simple method for providing subincisional muscle coverage of expander implants with pectoralis muscle flaps. In this technique, a pocket is developed under the pectoralis muscle. The sternal origin of the pectoralis is released from the midsternal position to its inferior origin. The pectoralis muscle is then rotated inferior-laterally and sutured to the dermis of the underside of the inferior mastectomy skin flap, thereby providing subincisional muscle coverage of the expander implant. During a 5-year period, 42 patients between the ages of 36 and 61 underwent breast reconstruction utilizing this technique. In these patients, there were 4 instances of marginal necrosis. In each of these cases, the implants did not become exposed, and all patients completed the expansion process without significant delay and underwent subsequent implant exchange without incident. Five-year follow-up has shown good esthetic results in all patients.

Adult↗
PubMed2005

Atypical shoulder muscle activation in multidirectional instability.

OBJECTIVE: Surface and intramuscular electromyography was used to investigate shoulder muscle activity in subjects with multidirectional instability (MDI). METHODS: Subjects (seven MDI, 11 control) performed repetitive shoulder abduction/adduction, flexion/extension and internal/external rotation movements on an isokinetic dynamometer. The activity of the deltoid, infraspinatus, supraspinatus, latissimus dorsi, and pectoralis major muscles were recorded using double-differential surface and intramuscular fine-wire electrodes. A repeated measures analysis of variance evaluated group differences in the amplitude, onset, termination and duration of the muscle activity. RESULTS: Significant activation parameter differences for the supraspinatus, infraspinatus, posterior deltoid and pectoralis major muscles were found in the subjects with MDI. The rotator cuff and posterior deltoid muscles demonstrated abbreviated periods of activity when performing internal/external rotation, despite activation amplitudes that were similar to the controls. In contrast, the activation of the pectoralis major differed from the control group in both the amplitude and time domains when performing shoulder extension. CONCLUSIONS: MDI is associated with atypical patterns of muscle activity that occur even when highly constrained movements are used to elicit the activity. SIGNIFICANCE: In addition to glenohumeral hyperlaxity, the results suggest that dysfunctional neuromuscular control of the rotator cuff is also a contributing factor to the pathoetiology of MDI.

Adult↗
PubMed1985

Specificity of innervation among Xenopus twitch muscle fibers.

More than 50% of the Xenopus pectoralis twitch muscle fibers with two distant endplates are innervated at both sites by the same neuron. This study indicates that there are three separable twitch motor unit types in this muscle which show very little overlap in innervation. This study also shows that each motor unit is topographically localized and that similar type units are shifted relative to one another. It is concluded that these two factors may contribute importantly to the observed high incidence of mononeuronal innervation.

Animals↗
PubMedDate not supplied

Shoulder muscle firing patterns during the windmill softball pitch.

The purpose of this study was to describe the activity of eight shoulder muscles during the windmill fast-pitch softball throw. Ten collegiate female pitchers were analyzed with intramuscular electromyography, high-speed cinematography, and motion analysis. The supraspinatus muscle fired maximally during arm elevation from the 6 to 3 o'clock position phase, centralizing the humeral head within the glenoid. The posterior deltoid and teres minor muscles acted maximally from the 3 to 12 o'clock position phase to continue arm elevation and externally rotate the humerus. The pectoralis major muscle accelerated the arm from the 12 o'clock position to ball release phase. The serratus anterior muscle characteristically acted to position the scapula for optimal glenohumeral congruency, and the subscapularis muscle functioned as an internal rotator and to protect the anterior capsule. Although the windmill softball pitch is overtly different from the baseball pitch, several surprising similarities were revealed. The serratus anterior and pectoralis major muscles work in synchrony and seem to have similar functions in both pitches. Although the infraspinatus and teres minor muscles are both posterior cuff muscles, they are characteristically uncoupled during the 6 to 3 o'clock position phase, with the infraspinatus muscle acting more independently below 90 degrees. Subscapularis muscle activity seems important in dynamic anterior glenohumeral stabilization and as an internal rotator in both the baseball and softball throws.

Adolescent↗
PubMed1989

Familial Poland's syndrome.

Absence of the right pectoralis major muscle and hypoplasia of the ipsilateral breast was observed in 3 females and hypoplasia or agenesis of the right pectoralis major muscle in 2 males of the same family. One member of this family, a 17-year-old girl, underwent a right latissimus dorsi muscle flap, placement of silicone-gel breast implant, and a right infraclavicular natural Y prosthesis. Although none of our 5 patients from this family had congenital upper limb abnormalities, we believe that they still qualify as having Poland's syndrome. This would distinguish them as being the fourteenth known family reported in the world literature with this diagnosis. A brief review of the history as well as hypotheses of etiological mechanisms are presented.

Adolescent↗
PubMed2005

Electromyographic activity of the pectoralis major and anterior deltoid muscles during three upper-body lifts.

The purpose of this study was to examine the differences in activation levels and times of activation for the pectoralis major and anterior deltoid when performing the concentric phase of 3 upper-body lifts. Twelve college-age men and women with various degrees of lifting experience performed 3 repetitions using the 6 repetition maximum in a barbell bench press, dumbbell bench press, and dumbbell fly while being monitored for electromyographic activity in both muscles. Motor unit activation of both muscles was not significantly different during all 3 lifts. However, dumbbell flys had significantly less relative time of activation than did barbell or dumbbell bench presses. Therefore, dumbbell flys may be better suited as an auxiliary lift, whereas barbell and dumbbell bench presses may be used interchangeably in training programs. The compatibility of the barbell and dumbbell bench presses may aid lifters in overcoming training plateaus by alternating exercises for the same muscle groups.

Adult↗
PubMed2006

Radiation-associated extraskeletal osteosarcoma of the chest wall.

Radiation-associated sarcoma is a rare but potential complication of radiation therapy. Most reported cases of osteosarcoma of the chest wall following radiation therapy for breast cancer arise from the chest wall skeletal structures. In contrast, few cases of extraskeletal osteosarcomas have been reported. We report a rare example of an extraskeletal osteosarcoma involving the pectoralis major muscle occurring after radiation therapy for breast cancer. Extraskeletal osteosarcomas are rare soft tissue tumors with a high rate of local recurrence and a poor prognosis.

Biomarkers, Tumor↗
PubMed1989

Sternal osteomyelitis: treatment with rectus abdominis muscle.

Sternal osteomyelitis complicates recovery in a small number of patients following median sternotomy. Techniques for operative treatment have in common the wide debridement of devitalised tissue and administration of culture-specific antibiotics. The resultant wound can be managed by delayed primary closure or transposition of well-vascularised adjacent tissue. Omentum, pectoralis major muscle and rectus abdominis muscle are suitable for transposition either alone or in combination. Our series is composed of ten patients who underwent rectus abdominis muscle transfer for the treatment of sternal osteomyelitis. The rectus abdominis obliterates dead space in the lower third of the wound, a difficult area to reach with the pectoralis major muscle. Five patients had one rectus abdominis muscle alone transposed, avoiding the aesthetic and functional deficits of pectoralis major transposition and the risks of omental transfer. Wound healing occurred in every case with a minimum of postoperative complications.

Abdominal Muscles↗